Not able to read notifications from other apps

Not able to read notifications from other apps - android

I want to read notifications from other apps in android , but I am not able to do so. These are my implementations to achieve same.
This is my MainActivity.java
package com.example.demoapp;
import androidx.appcompat.app.AppCompatActivity;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Html;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TableLayout tab;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tab = (TableLayout)findViewById(R.id.tab);
LocalBroadcastManager.getInstance(this).registerReceiver(onNotice, new IntentFilter("Msg"));
}
private BroadcastReceiver onNotice= new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
String pack = intent.getStringExtra("package");
String title = intent.getStringExtra("title");
String text = intent.getStringExtra("text");
TableRow tr = new TableRow(getApplicationContext());
tr.setLayoutParams(new TableRow.LayoutParams( TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.WRAP_CONTENT));
TextView textview = new TextView(getApplicationContext());
textview.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT,1.0f));
textview.setTextSize(20);
textview.setTextColor(Color.parseColor("#0B0719"));
textview.setText(Html.fromHtml(pack +"<br><b>" + title + " : </b>" + text));
tr.addView(textview);
tab.addView(tr);
}
};
}
This is my NotificationService class
package com.example.demoapp;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.service.notification.NotificationListenerService;
import android.service.notification.StatusBarNotification;
import android.util.Log;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
public class NotificationService extends NotificationListenerService {
Context context;
#Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();
}
#Override
public void onNotificationPosted(StatusBarNotification sbn) {
String pack = sbn.getPackageName();
String ticker = sbn.getNotification().tickerText.toString();
Bundle extras = sbn.getNotification().extras;
String title = extras.getString("android.title");
String text = extras.getCharSequence("android.text").toString();
Log.i("Package",pack);
Log.i("Ticker",ticker);
Log.i("Title",title);
Log.i("Text",text);
Intent msgrcv = new Intent("Msg");
msgrcv.putExtra("package", pack);
msgrcv.putExtra("ticker", ticker);
msgrcv.putExtra("title", title);
msgrcv.putExtra("text", text);
LocalBroadcastManager.getInstance(context).sendBroadcast(msgrcv);
}
#Override
public void onNotificationRemoved(StatusBarNotification sbn) {
Log.i("Msg","Notification Removed");
}
}
This is my AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:dist="http://schemas.android.com/apk/distribution"
package="com.example.demoapp">
<dist:module dist:instant="true" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name="com.example.demoapp.NotificationService"
android:label="#string/app_name"
android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
<intent-filter>
<action android:name="android.service.notification.NotificationListenerService" />
</intent-filter>
</service>
</application>
</manifest>
This is my activity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tab" />
</ScrollView>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
I have tested app in Android 5 and above, it is not getting any notification details. I gave permission to the app for reading permissions in android while testing on Android 6 and above versions.
Suggest me where I am getting wrong.

I have created a small demo for you its working fine in Android API-18 and above devices.
Even you can
Read all incoming SMS
Read all incoming calls
Battery Low and other notifications too
This is screenshot for display notification of other application Picture1 Picture2
NotificationService.java
import android.app.Notification;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.service.notification.NotificationListenerService;
import android.service.notification.StatusBarNotification;
import android.util.Log;
import android.support.v4.content.LocalBroadcastManager;
import java.io.ByteArrayOutputStream;
public class NotificationService extends NotificationListenerService {
Context context;
#Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();
}
#Override
public void onNotificationPosted(StatusBarNotification sbn) {
String pack = sbn.getPackageName();
String ticker ="";
if(sbn.getNotification().tickerText !=null) {
ticker = sbn.getNotification().tickerText.toString();
}
Bundle extras = sbn.getNotification().extras;
String title = extras.getString("android.title");
String text = extras.getCharSequence("android.text").toString();
int id1 = extras.getInt(Notification.EXTRA_SMALL_ICON);
Bitmap id = sbn.getNotification().largeIcon;
Log.i("Package",pack);
Log.i("Ticker",ticker);
Log.i("Title",title);
Log.i("Text",text);
Intent msgrcv = new Intent("Msg");
msgrcv.putExtra("package", pack);
msgrcv.putExtra("ticker", ticker);
msgrcv.putExtra("title", title);
msgrcv.putExtra("text", text);
if(id != null) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
id.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
msgrcv.putExtra("icon",byteArray);
}
LocalBroadcastManager.getInstance(context).sendBroadcast(msgrcv);
}
#Override
public void onNotificationRemoved(StatusBarNotification sbn) {
Log.i("Msg","Notification Removed");
}
}
MainActivity.java
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends Activity {
ListView list;
CustomListAdapter adapter;
ArrayList<Model> modelList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
modelList = new ArrayList<Model>();
adapter = new CustomListAdapter(getApplicationContext(), modelList);
list=(ListView)findViewById(R.id.list);
list.setAdapter(adapter);
LocalBroadcastManager.getInstance(this).registerReceiver(onNotice, new IntentFilter("Msg"));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);//Menu Resource, Menu
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
Intent intent = new Intent(
"android.settings.ACTION_NOTIFICATION_LISTENER_SETTINGS");
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private BroadcastReceiver onNotice= new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// String pack = intent.getStringExtra("package");
String title = intent.getStringExtra("title");
String text = intent.getStringExtra("text");
//int id = intent.getIntExtra("icon",0);
Context remotePackageContext = null;
try {
byte[] byteArray =intent.getByteArrayExtra("icon");
Bitmap bmp = null;
if(byteArray !=null) {
bmp = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
}
Model model = new Model();
model.setName(title +" " +text);
model.setImage(bmp);
if(modelList !=null) {
modelList.add(model);
adapter.notifyDataSetChanged();
}else {
modelList = new ArrayList<Model>();
modelList.add(model);
adapter = new CustomListAdapter(getApplicationContext(), modelList);
list=(ListView)findViewById(R.id.list);
list.setAdapter(adapter);
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="{relativePackage}.${activityClass}" >
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
Androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.demoapp">
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name="com.example.demoapp.MainActivity"
android:configChanges="keyboardHidden|orientation|screenSize"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service
android:name="com.example.demoapp.NotificationService"
android:label="#string/app_name"
android:permission="android.permission.BIND_NOTIFICATION_LISTENER_SERVICE">
<intent-filter>
<action android:name="android.service.notification.NotificationListenerService" />
</intent-filter>
</service>
</application>
</manifest>

Related

How can I intercept an sms, append a string to it, and pass it on as usual in Android

So I have to intercept the sms part figured out, as you can see in my code below.
However I run into trouble after receiving the message.
I need help appending a String to the end of the message, and then passing it on as normal as if it were never manipulated.
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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<uses-permission android:name="android.permission.WRITE_SMS" />
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<intent-filter android:priority="999" >
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MainActivity.java
package guidi.moodandroid;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
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Button button;
#Override
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setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
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requestPermissions();
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private void requestPermissions() {
String receivePermission = Manifest.permission.RECEIVE_SMS;
String readPermission = Manifest.permission.READ_SMS;
if ((ActivityCompat.checkSelfPermission(this, receivePermission) !=
PackageManager.PERMISSION_GRANTED) ||
(ActivityCompat.checkSelfPermission(this, readPermission) !=
PackageManager.PERMISSION_GRANTED))
{
String[] permissions = {readPermission, readPermission};
ActivityCompat.requestPermissions(this, permissions,
ASK_MULTIPLE_PERMISSION_REQUEST_CODE);
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#Override
public void onRequestPermissionsResult(int requestCode, #NonNull String[] permissions, #NonNull int[] grantResults) {
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SmsBroadcastReceiver.java
package guidi.moodandroid;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
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// .toString();
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smsMessageStr += "SMS From: " + address + "\n";
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<?xml version="1.0" encoding="utf-8"?>
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android:paddingRight="#dimen/activity_horizontal_margin"
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android:text="Button"
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android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
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Activity doesn't start from NFC_TECH_DISCOVERED-intent filter

I am trying to read some information via NFC and created the intent-filter to do so, together with the xml that contains the required technologies. The intent-filter should start my ReadActivity, but it doesn't do so, when I put the card near my phone. NFC is activated, so this shouldn't be the problem. I really don't see the problem with my code, so it would be great if someone could take a look at it and maybe give me a hint in the right direction. Here is the code:
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.johan.nfcreaderforunicard">
<uses-permission android:name="android.permission.NFC" />
<uses-feature android:name="android.hardware.nfc" android:required="true"/>
<uses-sdk android:minSdkVersion="10"/>
<application
android:allowBackup="true"
android:icon="#mipmap/apple"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/Theme.AppCompat.Light.NoActionBar">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ReadActivity">
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<meta-data android:name="android.nfc.action.TECH_DISCOVERED"
android:resource="#xml/tech"/>
</activity>
</manifest>
ReadActivity:
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.IsoDep;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.TextView;
import android.content.Intent;
import android.os.Bundle;
import java.io.IOException;
public class ReadActivity extends AppCompatActivity {
private final byte[] selectAid = {(byte)90, (byte)95, (byte)-124, (byte)21};
private final byte[] creditPayload = {(byte)108, (byte)1};
private byte[] resultOk;
private byte[] creditBytes;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.read_view);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
if(NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())){
IsoDep isodep = IsoDep.get((Tag)getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG));
if(isodep != null){
try{
isodep.connect();
resultOk = isodep.transceive(selectAid);
if(resultOk[0] == 0){
creditBytes = isodep.transceive(creditPayload);
}
}catch (IOException e){
}
}
}
float credit = (float)formatCredit(creditBytes);
TextView label = (TextView)findViewById(R.id.read_text);
label.setText("Dein Guthaben: "+String.valueOf(credit)+"€");
}
private double formatCredit(byte[] array) {
double credit = (double)(((0xff & array[4]) << 24) + ((0xff & array[3]) << 16) + ((0xff & array[2]) << 8) + (0xff & array[1])) / 1000D;
return credit;
}
#Override
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem menuItem){
switch(menuItem.getItemId()){
case(R.id.action_settings):
Intent startSettings = new Intent(ReadActivity.this, SettingsActivity.class);
startActivity(startSettings);
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case(R.id.about):
Intent startAbout = new Intent(ReadActivity.this, AboutActivity.class);
startActivity(startAbout);
return true;
default:
return super.onOptionsItemSelected(menuItem);
}
}
#Override
public void onBackPressed(){
Intent backToMain = new Intent(getApplicationContext(), MainActivity.class);
startActivity(backToMain);
finish();
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}
MainActivity:
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
}
#Override
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem menuItem){
switch(menuItem.getItemId()){
case(R.id.action_settings):
Intent startSettings = new Intent(MainActivity.this, SettingsActivity.class);
startActivity(startSettings);
return true;
case(R.id.about):
Intent startAbout = new Intent(MainActivity.this, AboutActivity.class);
startActivity(startAbout);
return true;
default:
return super.onOptionsItemSelected(menuItem);
}
}
#Override
public void onBackPressed(){
finish();
}
}
The AboutActivity and SettingsActivity don't contain anything yet, so I didn't include them in this post. I really don't know where the problem is though.

Restarting my phone and the NFC-setting solved the problem.

Android app crashes on Bluetooth connect?

I'm trying to connect to other Android devices using Bluetooth via my app. The app works fine while discovering nearby Bluetooth devices. However, upon connecting, the app crashes.
I have two JAVA files other than MainActivity.java that are responsible for discovering & connecting to other Bluetooth devices. Their codes are posted below:
SearchBTDevice.java (for discovering nearby devices)
package vertex2016.mvjce.edu.bluealert;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGattDescriptor;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.bluetooth.BluetoothAdapter;
import android.provider.Settings;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.Set;
public class SearchBTDevice extends AppCompatActivity {
public BluetoothAdapter BlueAdapter = BluetoothAdapter.getDefaultAdapter();
public ArrayAdapter PairedArrayAdapter;
public ArrayAdapter BTArrayAdapter;
BluetoothDevice btd;
public ListView devicesFound;
private final BroadcastReceiver BTReceiver= new BroadcastReceiver(){
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
btd = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
BTArrayAdapter.add(btd.getName() + "\t" + btd.getAddress() + "\n");
}
}
};
IntentFilter filter1 = new IntentFilter(BluetoothDevice.ACTION_FOUND);
#Override
protected void onResume() {
super.onResume();
this.registerReceiver(BTReceiver,filter1);
}
#Override
protected void onPause() {
super.onPause();
BlueAdapter.cancelDiscovery();
this.unregisterReceiver(BTReceiver);
Toast.makeText(SearchBTDevice.this, "Discovery Stopped!!", Toast.LENGTH_SHORT).show();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_btdevice);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
searchBTDevices();
}
public void searchBTDevices()
{
if(!BlueAdapter.startDiscovery())
Toast.makeText(SearchBTDevice.this, "Failed to Start Discovery", Toast.LENGTH_SHORT).show();
else
Toast.makeText(SearchBTDevice.this, "Discovery Startred", Toast.LENGTH_SHORT).show();
BTArrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1);
devicesFound = (ListView)findViewById(R.id.searchpagelistView);
devicesFound.setAdapter(BTArrayAdapter);
devicesFound.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent connectedBTintent = new Intent(SearchBTDevice.this, ConnectedBTDevice.class);
connectedBTintent.putExtra("BluetoothDevice", btd);
startActivity(connectedBTintent);
}
});
}
}
This is updated ConnectedBTDevice.java, responsible for connecting devices
package vertex2016.mvjce.edu.bluealert;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.io.IOException;
import java.util.UUID;
public class ConnectedBTDevice extends AppCompatActivity {
public BluetoothDevice btd;
public BluetoothSocket btSocket, tempSocket;
private UUID myUUID;
ArrayAdapter arr;
ListView lv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_connected_btdevice);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
arr = new ArrayAdapter(this, android.R.layout.simple_list_item_2);
btd = getIntent().getParcelableExtra("BluetoothDevice");
connectBT();
displayStuff();
}
public void connectBT() {
Thread myThread = new Thread() {
public void run() {
tempSocket = null;
try {
tempSocket = btd.createRfcommSocketToServiceRecord(myUUID);
} catch (IOException e) {
e.printStackTrace();
}
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
try {
tempSocket.connect();
arr.add("CONNECTED TO-->" + btd.getName());
} catch (IOException e) {
e.printStackTrace();
try {
tempSocket.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
};
myThread.start();
}
public void displayStuff()
{
lv = (ListView)findViewById(R.id.connectedBTlistView);
lv.setAdapter(arr);
}
}
This is activity_connected_btdevice.xml for ConnectedBTDevice.java activity
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="vertex2016.mvjce.edu.bluealert.SearchBTDevice">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.NoActionBar.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.NoActionBar.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_connected_btdevice" />
</android.support.design.widget.CoordinatorLayout>
This is content_connected_btdevice.xml for ConnectedBTDevice.java
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="vertex2016.mvjce.edu.bluealert.ConnectedBTDevice"
tools:showIn="#layout/activity_connected_btdevice">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/connectedBTimageView"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:src="#drawable/bluealert_bg"
android:scaleType="centerCrop"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Connected Bluetooth Device"
android:id="#+id/connectedBTtextextView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="105dp"
android:textSize="25dp"
android:textAlignment="center"/>
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/connectedBTlistView"
android:layout_below="#+id/connectedBTtextextView"
android:layout_centerHorizontal="true"
android:layout_marginTop="65dp" />
</RelativeLayout>
This is AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="vertex2016.mvjce.edu.bluealert">
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<application
android:allowBackup="true"
android:icon="#mipmap/bluealerticon"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme.NoActionBar">
<activity
android:name=".SplashScreen"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity" />
<activity
android:name=".SearchBTDevice"
android:label="#string/title_activity_search_btdevice"
android:parentActivityName=".MainActivity"
android:theme="#style/AppTheme.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="vertex2016.mvjce.edu.bluealert.MainActivity" />
</activity>
<activity
android:name=".ConnectedBTDevice"
android:label="#string/title_activity_connected_btdevice"
android:parentActivityName=".SearchBTDevice"
android:theme="#style/AppTheme.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="vertex2016.mvjce.edu.bluealert.SearchBTDevice" />
</activity>
</application>
</manifest>
Here's the exception that my updated logcat shows
03-24 00:19:40.541 7205-9703/vertex2016.mvjce.edu.bluealert E/AndroidRuntime: FATAL EXCEPTION: Thread-35890
Process: vertex2016.mvjce.edu.bluealert, PID: 7205
java.lang.NullPointerException: Attempt to invoke virtual method 'long java.util.UUID.getMostSignificantBits()' on a null object reference
at android.os.ParcelUuid.writeToParcel(ParcelUuid.java:129)
at android.bluetooth.IBluetooth$Stub$Proxy.connectSocket(IBluetooth.java:1767)
at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:309)
at vertex2016.mvjce.edu.bluealert.ConnectedBTDevice$1.run(ConnectedBTDevice.java:63)
I don't understand what the problem is. I have tried several online tutorials, but nothing seemed to work. I know the problem is in my ConnectedBTDevice.java, but can't figure out the point at which it's throwing the exception.
Thank you for your time.

You are assigning BluetoothSocket to tempSocket, and then you try to invoke connect() method on btSocket which is null.

Android service error Attempt to invoke virtual method

I am making an app, where a server in java sends a Place Array and other stuff in other activities. so I create a service to connect to the server from different activities. I have not implement server connection yet but I am simulating the server response, which I pass as parameter to an adapter (the adapter is tested), that I create to show this places in a ListView. so I got my Place array in my activity and I set it to the return object from a method in the service, but when I run the app it crashes and I got this error message:
java.lang.NullPointerException: Attempt to invoke virtual method
'com.remedialguns.smartourist.Place[]
com.remedialguns.smartourist.ConnectionService.getPlaces()' on a null
object.
UPDATE now is te same error but in myAdapter class when name.setText...
so this is my service.
package com.remedialguns.smartourist;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
import java.io.IOException;
import java.io.PrintStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.Locale;
public class ConnectionService extends Service {
Socket s;
PrintStream os;
private static final String TAG="com.remedialguns.smartourist";
private final IBinder myBinder = new LocalBinder();
#Override
public IBinder onBind(Intent intent) {
return myBinder;
}
public void sendProfileData(){
//send profile data to server
}
public Place[] getPlaces(){
Place[] PlacesToShow = new Place[10];
//F̶a̶k̶e̶ ̶d̶a̶t̶a̶ Test data
PlacesToShow[0]= new Place("MUSEO","Museo Nacional Agropecuario", 0.15, 0.4, 0.12);
PlacesToShow[1]= new Place("MUSEO","Museo Arqueológico Junín",0.10, 0.78, 0.44);
PlacesToShow[2]= new Place("MUSEO","Museo Botero", 0.2, 0.8, 0.08);
PlacesToShow[3]= new Place("MUSEO","Museo de Zea", 0.3, 0.65, 0.23);
PlacesToShow[4]= new Place("MUSEO","MUSEO DEL ORO", 0.13, 0.56, 0.12);
PlacesToShow[5]= new Place("MUSEO","MUSEO DE ARTE COLONIAL", 0.3, 0.67, 0.14);
PlacesToShow[6]= new Place("MUSEO","MUSEO HISTORICO DE LA POLICIA NACIONAL", 0.34, 0.3, 0.33);
PlacesToShow[8]= new Place("MUSEO","MUSEO DE LOS NIÑOS", 0.05, 0.65, 0.03);
PlacesToShow[7]= new Place("MUSEO","Museo Nacional", 0.15, 0.4, 0.12);
PlacesToShow[9]= new Place("MUSEO","MUSEO MILITAR", 0.07, 0.5, 0.6);
return PlacesToShow;
}
public class LocalBinder extends Binder {
ConnectionService getService(){
return ConnectionService.this;
}
}
}
this is my activity with my ListView and adapter.(UPDATE)
package com.remedialguns.smartourist;
import android.content.ComponentName;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.os.IBinder;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import com.remedialguns.smartourist.ConnectionService.LocalBinder;
import com.google.android.gms.location.places.Places;
public class ListActivity extends AppCompatActivity {
ConnectionService tcpService;
boolean isBound=false;
//Place[] PlacesToShow=tcpService.getPlaces();
Place[] PlacesToShow=new Place[10];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Intent i = new Intent(this, ConnectionService.class);
bindService(i, myConnection, Context.BIND_AUTO_CREATE);
// PlacesToShow=tcpService.getPlaces();
if (isBound) {
PlacesToShow = tcpService.getPlaces();
}
//Place[] PlacesToShow=tcpService.getPlaces();
ListAdapter MyAdapter = new MyAdapter(this, PlacesToShow);
ListView ListPlaces=(ListView) findViewById(R.id.MyList);
ListPlaces.setAdapter(MyAdapter);
ListPlaces.setOnItemClickListener(
new AdapterView.OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Context context = view.getContext();
TextView textViewItem = ((TextView)view.findViewById(R.id.name));
String name =textViewItem.getText().toString();
TextView textViewItem2 = (TextView)findViewById(R.id.description);
String descripcion=textViewItem2.getText().toString();
Toast.makeText(context,"lugar: "+name+", descripcion: "+descripcion,Toast.LENGTH_SHORT).show();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private ServiceConnection myConnection=new ServiceConnection() {
#Override
public void onServiceConnected(ComponentName name, IBinder service) {
LocalBinder binder = (LocalBinder) service;
tcpService = binder.getService();
PlacesToShow = tcpService.getPlaces();
isBound = true;
}
#Override
public void onServiceDisconnected(ComponentName name) {
isBound=false;
}
};
}
this is my activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_list"
tools:context="com.remedialguns.smartourist.ListActivity">
<!-- <TextView
android:id="#+id/answer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="these are the places that our smart monkeys had find for you."/>
-->
<ListView
android:id="#+id/MyList"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
this is my manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.remedialguns.smartourist" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity
android:name=".LoginActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar" >
</activity>
<activity
android:name=".RealMainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar" >
</activity>
<activity
android:name=".ListActivity"
android:label="#string/app_name"
android:parentActivityName=".RealMainActivity"
android:theme="#style/AppTheme.NoActionBar" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.remedialguns.smartourist.RealMainActivity" />
</activity>
<service
android:name=".ConnectionService"
android:enabled="true"
android:exported="true" >
</service>
</application>
</manifest>
this is my adapter class
package com.remedialguns.smartourist;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyAdapter extends ArrayAdapter<Place> {
MyAdapter(Context context, Place[] places){
super(context, R.layout.visual_place, places);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater MyInflater = LayoutInflater.from(getContext());
View placeView = MyInflater.inflate(R.layout.visual_place, parent, false);
Place singlePlaceItem=getItem(position);
TextView name=(TextView) placeView.findViewById(R.id.name);
ImageView icon =(ImageView) placeView.findViewById(R.id.icon);
TextView description = (TextView) placeView.findViewById(R.id.description);
name.setText(singlePlaceItem.getName().toString());
icon.setImageResource(R.mipmap.ic_launcher);
description.setText("Cost "+singlePlaceItem.getCost()+", distance "+singlePlaceItem.getDistance()+", rate "+singlePlaceItem.getRate()+" *");
return placeView;
}
}
please help me.

Here:
bindService(i, myConnection, Context.BIND_AUTO_CREATE);
Place[] PlacesToShow=new Place[10];
PlacesToShow=tcpService.getPlaces();
tcpService is null probably using is to call getPlaces() method before onServiceConnected method is called.
Use isBound to check onServiceConnected is called or not before using tcpService object:
if(isBound){
//
PlacesToShow=tcpService.getPlaces();
}
and also use onServiceConnected method as:
#Override
public void onServiceConnected(ComponentName name, IBinder service) {
LocalBinder binder = (LocalBinder) service;
tcpService = binder.getService();
PlacesToShow=tcpService.getPlaces();
isBound=true;
}
Also make sure added ConnectionService in AndroidManifest.xml as service.

I need alarm to start after specified time interval but alarm is executing at the start and repeats after certain interval

I have attached my code here for reference.
I need alarm to be executed after certain interval but its starting at the beginning and repeating. Can i get a solution for this.
AlarmManagerExample.java
package com.example.alarmmanagerexample;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
public class AlarmManagerExample extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alarm_manager_example);
try {
//Create a new PendingIntent and add it to the AlarmManager
Intent intent = new Intent(this, RingAlarm.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,
12345, intent, PendingIntent.FLAG_CANCEL_CURRENT);
AlarmManager am =
(AlarmManager)getSystemService(Activity.ALARM_SERVICE);
am.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(),
2*60*60,pendingIntent);
} catch (Exception e) {}
}
}
activity_alarm_manager_example.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".AlarmManagerExample" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world" />
</RelativeLayout>
RingAlarm.java
package com.example.alarmmanagerexample;
import android.app.Activity;
import android.content.Context;
import android.media.MediaPlayer;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
public class RingAlarm extends Activity {
MediaPlayer mp=null ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.alarm);
Button stopAlarm = (Button) findViewById(R.id.stopAlarm);
mp = MediaPlayer.create(getBaseContext(),R.raw.audio);
stopAlarm.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// TODO Auto-generated method stub
mp.stop();
finish();
return false;
}
});
playSound(this, getAlarmUri());
}
private void playSound(final Context context, Uri alert) {
Thread background = new Thread(new Runnable() {
public void run() {
try {
mp.start();
} catch (Throwable t) {
Log.i("Animation", "Thread exception "+t);
}
}
});
background.start();
}
#Override
protected void onDestroy() {
super.onDestroy();
mp.stop();
} //Get an alarm sound. Try for an alarm. If none set, try notification,
//Otherwise, ringtone.
private Uri getAlarmUri() {
Uri alert = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_ALARM);
if (alert == null) {
alert = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
if (alert == null) {
alert = RingtoneManager
.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
}
}
return alert;
}
}
Alarm.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button android:text="Stop Alarm" android:id="#+id/stopAlarm"
android:layout_width="wrap_content" android:layout_height="wrap_content" />
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.alarmmanagerexample"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.alarmmanagerexample.AlarmManagerExample"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".RingAlarm"
android:label="#string/app_name" />
</application>
</manifest>

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I need alarm to start after specified time interval but alarm is executing at the start and repeats after certain interval

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