Hi every one before i start excuse me because of my grammatically wrong sentences, my native language is not English.
i wrote a code for turning on and ... Bluetooth
i put a menu at the end which has only one item exit
but when i click that it show me "Unfortunately, Application has stopped"
please please help me
the MainActivity is shown below:
package com.example.application;
import android.os.Bundle;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import java.util.Set;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ToggleButton;
public class MainActivity extends Activity {
private static final int REQUEST_ENABLE_BT = 1;
private Button listBtn;
private Button findBtn;
private TextView text;
private BluetoothAdapter myBluetoothAdapter;
private Set<BluetoothDevice> pairedDevices;
private ListView myListView;
private ArrayAdapter<String> BTArrayAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(myBluetoothAdapter == null) {
listBtn.setEnabled(false);
findBtn.setEnabled(false);
text.setText("Status: not supported");
Toast.makeText(getApplicationContext(),"Your device does not support Bluetooth!",
Toast.LENGTH_LONG).show();
}
//---------------------------------------------------------
else {
final ImageView iv = (ImageView) findViewById(R.id.imageView1);
final ToggleButton tb = (ToggleButton) findViewById(R.id.toggleButton1);
text = (TextView) findViewById(R.id.text);
iv.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(!(tb.isChecked())){
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);
Toast.makeText(getApplicationContext(),"Bluetooth turned on !" ,
Toast.LENGTH_LONG).show();
tb.toggle();
iv.setImageResource(R.drawable.on);
}
else{
Toast.makeText(getApplicationContext(),"Bluetooth is already on !",
Toast.LENGTH_LONG).show();
}
}else{
myBluetoothAdapter.disable();
text.setText("Status: Disconnected");
Toast.makeText(getApplicationContext(),"Bluetooth turned off !",
Toast.LENGTH_LONG).show();
tb.toggle();
iv.setImageResource(R.drawable.off);
}
}
});
listBtn = (Button)findViewById(R.id.paired);
listBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
list(v);
}
});
findBtn = (Button)findViewById(R.id.search);
findBtn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
find(v);
}
});
myListView = (ListView)findViewById(R.id.listView1);
// create the arrayAdapter that contains the BTDevices, and set it to the ListView
BTArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
myListView.setAdapter(BTArrayAdapter);
}
}
//---------------------------------------------------------
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if(requestCode == REQUEST_ENABLE_BT){
if(myBluetoothAdapter.isEnabled()) {
text.setText("Status: Enabled");
} else {
text.setText("Status: Disabled");
}
}
}
public void list(View view){
// get paired devices
pairedDevices = myBluetoothAdapter.getBondedDevices();
// put it's one to the adapter
for(BluetoothDevice device : pairedDevices)
BTArrayAdapter.add(device.getName()+ "\n" + device.getAddress());
Toast.makeText(getApplicationContext(),"Show Paired Devices",
Toast.LENGTH_SHORT).show();
}
final BroadcastReceiver bReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// add the name and the MAC address of the object to the arrayAdapter
BTArrayAdapter.add(device.getName() + "\n" + device.getAddress());
BTArrayAdapter.notifyDataSetChanged();
}
}
};
public void find(View view) {
if (myBluetoothAdapter.isDiscovering()) {
// the button is pressed when it discovers, so cancel the discovery
myBluetoothAdapter.cancelDiscovery();
}
else {
BTArrayAdapter.clear();
myBluetoothAdapter.startDiscovery();
registerReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
}
#Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(bReceiver);
}
// menu is shown here
//---------------------------------------------------
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.mainmenu,menu );
return true;
}
//--------------------------------------------------
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()==R.id.item1)
{
this.finish();
}
return super.onOptionsItemSelected(item);
}
//-------------------------------------------------
}
what should i do in menu code to ...
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.mainmenu,menu );
return true;
}
//--------------------------------------------------
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId()==R.id.item1)
{
======>>>>>>>>>> this.finish(); <<<<<<===========
}
return super.onOptionsItemSelected(item);
}
//-------------------------------------------------
Related
I am creating an application for working with a bluetooth device using the navigation drawer activity template, there was a problem with initializing the bluetooth adapter in a fragment, I attach my code below. When compiling the code, it gives the error
error: unreachable statement
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
package com.example.myt.ui.home;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import androidx.navigation.ui.AppBarConfiguration;
import com.example.myt.R;
import java.io.IOException;
import java.util.Set;
import java.util.UUID;
public class HomeFragment extends Fragment {
private HomeViewModel homeViewModel;
private static final int REQUEST_ENABLE_BT = 1;
private Button onBtn;
private Button offBtn;
private Button listBtn;
private Button findBtn;
private TextView text;
private BluetoothAdapter myBluetoothAdapter;
private BluetoothSocket socket;
private Set<BluetoothDevice> pairedDevices;
private ListView myListView;
private ArrayAdapter<String> BTArrayAdapter;
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private AppBarConfiguration mAppBarConfiguration;
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
homeViewModel =
ViewModelProviders.of(this).get(HomeViewModel.class);
View root = inflater.inflate(R.layout.fragment_home, container, false);
return root;
// take an instance of BluetoothAdapter - Bluetooth radio
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(myBluetoothAdapter == null) {
onBtn.setEnabled(false);
offBtn.setEnabled(false);
listBtn.setEnabled(false);
findBtn.setEnabled(false);
text.setText("Status: not supported");
Toast.makeText(getActivity().getBaseContext(),"Your device does not support Bluetooth",
Toast.LENGTH_LONG).show();
} else {
text = (TextView) root.findViewById(R.id.text);
onBtn = (Button) root.findViewById(R.id.turnOn);
onBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
on(v);
}
});
offBtn = (Button) root.findViewById(R.id.turnOff);
offBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
off(v);
}
});
listBtn = (Button) root.findViewById(R.id.paired);
listBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
list(v);
}
});
findBtn = (Button) root.findViewById(R.id.search);
findBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
find(v);
}
});
myListView = (ListView) root.findViewById(R.id.listView1);
// create the arrayAdapter that contains the BTDevices, and set it to the ListView
BTArrayAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1);
myListView.setAdapter(BTArrayAdapter);
}
myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
myBluetoothAdapter.cancelDiscovery();
final String info = ((TextView) arg1).getText().toString();
//get the device address when click the device item
String address = info.substring(info.length()-17);
//connect the device when item is click
BluetoothDevice connect_device = myBluetoothAdapter.getRemoteDevice(address);
try {
socket = connect_device.createRfcommSocketToServiceRecord(MY_UUID);
socket.connect();
} catch (IOException e) {
try {
socket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
}
});//************new_devices_list end
}
private void errorExit(String title, String message){
Toast.makeText(getActivity().getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
getActivity().finish();
}
public void on(View view){
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);
Toast.makeText(getActivity().getBaseContext(),"Bluetooth turned on" ,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(getActivity().getBaseContext(),"Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_ENABLE_BT) {
if (myBluetoothAdapter.isEnabled()) {
text.setText("Status: Enabled");
} else {
text.setText("Status: Disabled");
}
}
}
public void list(View view){
// get paired devices
pairedDevices = myBluetoothAdapter.getBondedDevices();
// put it's one to the adapter
for(BluetoothDevice device : pairedDevices)
BTArrayAdapter.add(device.getName()+ "\n" + device.getAddress());
Toast.makeText(getActivity().getBaseContext(),"Show Paired Devices",
Toast.LENGTH_SHORT).show();
}
final BroadcastReceiver bReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// add the name and the MAC address of the object to the arrayAdapter
BTArrayAdapter.add(device.getName() + "\n" + device.getAddress());
BTArrayAdapter.notifyDataSetChanged();
}
}
};
public void find(View view) {
if (myBluetoothAdapter.isDiscovering()) {
// the button is pressed when it discovers, so cancel the discovery
myBluetoothAdapter.cancelDiscovery();
}
else {
BTArrayAdapter.clear();
myBluetoothAdapter.startDiscovery();
getActivity().registerReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
}
public void off(View view){
myBluetoothAdapter.disable();
text.setText("Status: Disconnected");
Toast.makeText(getActivity().getBaseContext(),"Bluetooth turned off",
Toast.LENGTH_LONG).show();
}
}
You are returning the view immediately on onCreateView, which is why the rest of the code can never be reached. The issue is here:
View root = inflater.inflate(R.layout.fragment_home, container, false);
return root;
Place return root; after:
new_devices list end
I'm working on an android app and I have a problem that i wish you could help me solve it.
So i have an activity1 called MainActivity and activity2 called myown. In myown i have a public class that i want to call in an onItemClick() in MainActivity . Here's the code of both activities below :
MainActivity.java
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;
public class MainActivity extends ActionBarActivity {
class Active extends myown {
}
private BluetoothAdapter btadapter;
private Set<BluetoothDevice> pairedDevices;
private SeekBar redcontrol = null;
private SeekBar greencontrol = null;
private SeekBar bluecontrol = null;
private TextView redv;
private TextView greenv;
private TextView bluev;
private ListView lv;
LinearLayout linearLayout;
Button on, off, button;
private static final UUID MY_UUID =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Insert bluetooth devices MAC address
private static String address = "00:14:02:13:08:21";
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_CANCELED) {
finish();
System.exit(10);
}
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btadapter = (BluetoothAdapter.getDefaultAdapter());
button = (Button)findViewById(R.id.button);
lv = (ListView)findViewById(R.id.listView1);
btadapter = BluetoothAdapter.getDefaultAdapter();
button = (Button) findViewById(R.id.button);
redv = (TextView) findViewById(R.id.redv);
greenv = (TextView) findViewById(R.id.greenv);
bluev = (TextView) findViewById(R.id.bluev);
redcontrol = (SeekBar) findViewById(R.id.seekBar);
greencontrol = (SeekBar) findViewById(R.id.seekBar2);
bluecontrol = (SeekBar) findViewById(R.id.seekBar3);
redcontrol.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
int progressChanged = 0;
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
progressChanged = progress;
redv.setText(String.valueOf(progress));
}
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public void onStopTrackingTouch(SeekBar seekBar) {
//Toast.makeText(MainActivity.this, "seek bar progress:" + progressChanged,
// Toast.LENGTH_SHORT).show();
}
});
greencontrol.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
int progressChanged = 0;
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
progressChanged = progress;
greenv.setText(String.valueOf(progress));
}
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public void onStopTrackingTouch(SeekBar seekBar) {
// Toast.makeText(MainActivity.this, "seek bar progress:" + progressChanged,
//Toast.LENGTH_SHORT).show();
}
});
bluecontrol.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
int progressChanged = 0;
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
progressChanged = progress;
bluev.setText(String.valueOf(progress));
}
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public void onStopTrackingTouch(SeekBar seekBar) {
//Toast.makeText(MainActivity.this, "seek bar progress:" + progressChanged,
// Toast.LENGTH_SHORT).show();
}
});
linearLayout = (LinearLayout) findViewById(R.id.linearLayout);
on = (Button) findViewById(R.id.on);
off = (Button) findViewById(R.id.off);
on.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
on.setBackgroundColor(Color.parseColor("#57D3E8"));
off.setBackgroundColor(Color.parseColor("#EAEAEA"));
if (!btadapter.isEnabled()) {
Intent turnOn = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOn, 0);
Toast.makeText(getApplicationContext(), "Bluetooth Turning On"
, Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Already On",
Toast.LENGTH_SHORT).show();
}
}
});
off.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
off.setBackgroundColor(Color.parseColor("#57D3E8"));
on.setBackgroundColor(Color.parseColor("#EAEAEA"));
if (btadapter.isEnabled()) {
btadapter.disable();
Toast.makeText(getApplicationContext(), "Bluetooth Off"
, Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Already Off",
Toast.LENGTH_SHORT).show();
}
}
});
}
public void list(View view) {
pairedDevices = btadapter.getBondedDevices();
ArrayList list = new ArrayList();
for(BluetoothDevice bt : pairedDevices)
list.add(bt.getName() +"\n" + bt.getAddress() );
Toast.makeText(getApplicationContext(),"Showing Paired Devices",
Toast.LENGTH_SHORT).show();
final ArrayAdapter adapter = new ArrayAdapter
(this,android.R.layout.simple_list_item_1, list);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String item = ((TextView) view).getText().toString();
Toast.makeText(getBaseContext(), item, Toast.LENGTH_SHORT).show();
for (BluetoothDevice device : pairedDevices) {
if ("bluetooth".equals(device.getName())) {
Intent launchActivity2 = new Intent(MainActivity.this, myown.class);
MainActivity.this.startActivity(launchActivity2);
break;
}
if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(true)) {
Toast.makeText(getBaseContext(), "Connected",Toast.LENGTH_SHORT).show();
//do nothing
}else {
Toast.makeText(getBaseContext(), "Unable to connect Light",Toast.LENGTH_SHORT).show();
}
view.setEnabled(false);
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
myown.java
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import java.io.IOException;
import java.util.UUID;
public class myown {
public class myOwnBroadcastReceiver extends BroadcastReceiver {
ConnectToBluetooth connectBT;
public BluetoothSocket scSocket;
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
BluetoothDevice discoveredDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
connectBT = new ConnectToBluetooth(discoveredDevice);
new Thread(connectBT).start();
}
class ConnectToBluetooth implements Runnable {
private BluetoothDevice btShield;
private BluetoothSocket mySocket = null;
private UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
public ConnectToBluetooth(BluetoothDevice bluetoothShield) {
btShield = bluetoothShield;
try {
mySocket = btShield.createRfcommSocketToServiceRecord(uuid);
} catch (IOException createSocketException) {
}
}
#Override
public void run() {
try {
mySocket.connect();
scSocket = mySocket;
} catch (IOException connectException) {
try {
mySocket.close(); //try to close the socket
} catch (IOException closeException) {
}
return;
}
}
// Will allow you to get the socket from this class
public BluetoothSocket getSocket() {
return mySocket;
}
/* Will cancel an in-progress connection, and close the socket */
public void cancel() {
try {
mySocket.close();
} catch (IOException e) {
}
}
}
}
}
add this to your activity
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
//add this
Intent launchActivity2 = new Intent(MainActivity.this, myown.class);
MainActivity.this.startActivity(launchActivity2);
//
String item = ((TextView) view).getText().toString();
Toast.makeText(getBaseContext(), item, Toast.LENGTH_SHORT).show();
for (BluetoothDevice device : pairedDevices) {
if ("bluetooth".equals(device.getName())) {
Intent launchActivity2 = new Intent(MainActivity.this, myown.class);
MainActivity.this.startActivity(launchActivity2);
break;
}
if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(true)) {
Toast.makeText(getBaseContext(), "Connected",Toast.LENGTH_SHORT).show();
//do nothing
}else {
Toast.makeText(getBaseContext(), "Unable to connect Light",Toast.LENGTH_SHORT).show();
}
view.setEnabled(false);
}
}
});
I would like to pair a Bluetooth device using Eclipse. But I don't really know to fix this code. Here is the code below:
package com.example.bluetoothtest;
import android.os.Bundle;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import java.util.Set;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final int REQUEST_ENABLE_BT = 1;
private Button myonbutton;
private Button myoffbutton;
private Button mylistbutton;
private Button myfindbutton;
private TextView mytext;
private BluetoothAdapter myBluetoothAdapter;
private Set<BluetoothDevice> mypairedDevices;
private ListView myListView;
private ArrayAdapter<String> myArrayAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(myBluetoothAdapter == null) {
myonbutton.setEnabled(false);
myoffbutton.setEnabled(false);
mylistbutton.setEnabled(false);
myfindbutton.setEnabled(false);
mytext.setText("Status: Your device is not supported");
Toast.makeText(getApplicationContext(),"Your device does not support Bluetooth",
Toast.LENGTH_LONG).show();
} else {
mytext = (TextView) findViewById(R.id.text);
myonbutton = (Button)findViewById(R.id.turnOn);
myonbutton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
on(v);
}
});
myoffbutton = (Button)findViewById(R.id.turnOff);
myoffbutton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
off(v);
}
});
mylistbutton = (Button)findViewById(R.id.paired);
mylistbutton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
list(v);
}
});
myfindbutton = (Button)findViewById(R.id.search);
myfindbutton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
find(v);
}
});
myListView = (ListView)findViewById(R.id.listView1);
myArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
myListView.setAdapter(myArrayAdapter);
}
}
public void on(View view){
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);
Toast.makeText(getApplicationContext(),"Bluetooth turned on" ,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(getApplicationContext(),"Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
if(requestCode == REQUEST_ENABLE_BT){
if(myBluetoothAdapter.isEnabled()) {
mytext.setText("Status: Enabled");
} else {
mytext.setText("Status: Disabled");
}
}
}
public void list(View view){
mypairedDevices = myBluetoothAdapter.getBondedDevices();
for(BluetoothDevice device : mypairedDevices)
myArrayAdapter.add(device.getName()+ "\n" + device.getAddress());
Toast.makeText(getApplicationContext(),"Show Paired Devices",
Toast.LENGTH_SHORT).show();
}
final BroadcastReceiver bReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
myArrayAdapter.add(device.getName() + "\n" + device.getAddress());
myArrayAdapter.notifyDataSetChanged();
}
}
};
public void find(View view) {
if (myBluetoothAdapter.isDiscovering()) {
myBluetoothAdapter.cancelDiscovery();
}
else {
myArrayAdapter.clear();
myBluetoothAdapter.startDiscovery();
registerReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
}
public void off(View view){
myBluetoothAdapter.disable();
mytext.setText("Status: Disconnected");
Toast.makeText(getApplicationContext(),"Bluetooth turned off",
Toast.LENGTH_LONG).show();
}
#Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
unregisterReceiver(bReceiver);
}
}
Here android developers on bluetooth
and some nice example: example from javacodegeeks
I am developing an application where I have to connect to a Bluetooth device.
When I click the btn_discover Button, it will call BroadcastReceiver and scan the new bluetooth device and show on the TextView.
When I use the TextView, I can see the bluetooth device on Textview.
And now I want to change the TextView to ListView.
But it always crashes. When in BroadcastReceiver's onReceive(), I write:
newDevicelistArrayAdapter.add(device.getName());
This is my Java Code:
package com.example.bttest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Set;
import com.example.bttest.R.menu;
import android.os.Bundle;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class Main extends Activity {
public BluetoothAdapter mBluetoothAdapter;
private static final int REQUEST_SELECT_DEVICE = 1;
public Button btn_scan;
public Button btn_discover;
public TextView pair_list;
public TextView scan_list;
public ListView scan_list_1;
public Set<BluetoothDevice> pairedDevices;
public ArrayAdapter<String> newDevicelistArrayAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_scan = (Button)findViewById(R.id.btn_scan);
btn_discover = (Button)findViewById(R.id.btn_discover);
pair_list = (TextView)findViewById(R.id.pair_list);
scan_list = (TextView)findViewById(R.id.scan_list);
newDevicelistArrayAdapter = new ArrayAdapter<String>(this, R.layout.main);
scan_list_1 = (ListView)findViewById(R.id.scan_list_1);
scan_list_1.setAdapter(newDevicelistArrayAdapter);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null)
{
Toast.makeText(this, "No support bluetooth", Toast.LENGTH_SHORT).show();
return;
}else if(mBluetoothAdapter != null) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_SELECT_DEVICE);
}
//******************scan按鈕動作-將已配對過的藍芽裝置列出來
btn_scan.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
pairedDevices = mBluetoothAdapter.getBondedDevices();
if(pairedDevices.size()>0) {
for(BluetoothDevice bDevice : pairedDevices) {
pair_list.append(bDevice.getName() + "\n" + bDevice.getAddress() + "\n" + bDevice.getBondState() + "\n" );
}
}
}
});
//******************scan按鈕動作結束
btn_discover.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
mBluetoothAdapter.startDiscovery();
}
});
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
scan_list.append(device.getName() + "\n" + device.getAddress() + "\n");
newDevicelistArrayAdapter.add(device.getName());
}
}
};
protected void onDestroy() {
super.onDestroy();
if (mBluetoothAdapter != null) {
mBluetoothAdapter.cancelDiscovery();
}
unregisterReceiver(mReceiver);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Does it any wrong when I use the ListView and ArrayAdapter?
Replace the onReceive() of your BroadcastReceiver with this:
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
scan_list.append(device.getName() + "\n" + device.getAddress() + "\n");
newDevicelistArrayAdapter.notifyDataSetChanged();
}
}
Hi Guys I am new with android programming and Java. I am trying to make a travel app. My issue is that how do I pass data from the selected item from the list to the editText filed. This is out I have done so far.. Pls. be kind I am newbee
The activity class that uses the ListActivity
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class SelectStationActivity extends ListActivity {
String stations[] = { "Acton Main Line","Ealing","Great Western","Albany Park"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ArrayAdapter <String> adapter =new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, stations);
setListAdapter(adapter);
}
protected void OnListItemClick(ListView l, View v, int position, long id) {
String values = stations[(int) id];
Intent result = new Intent().putExtra("SELECTED_STATION_NAME", values);
setResult(RESULT_OK, result);
finish();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.select_station, menu);
return true;
}
The main class
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter.ViewBinder;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class TravelActivity extends Activity {
// The request code for the selectChkInBt
protected static final int SelectChkin_REQUEST_CODE = 1;
// The request code for the selectChkOutBt
protected static final int SelectChkout_REQUEST_CODE = 2;
private String checkinStation;
private String checkoutStation;
private Button checkinButton, checkoutButton, selectChkInButton, selectChkOutButton;
private EditText checkinEditText, checkoutEditText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_travel);
checkinButton = (Button) findViewById(R.id.btCkIn);
checkoutButton = (Button) findViewById(R.id.BtChkOut);
selectChkInButton = (Button) findViewById(R.id.btselectChkIn);
selectChkOutButton = (Button) findViewById(R.id.btselectChkOut);
checkinEditText = (EditText) findViewById(R.id.EditTxtChkIn);
checkoutEditText = (EditText) findViewById(R.id.EditTxtChkOut);
checkinButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (checkinEditText.getText().toString().equals("")) {
Toast.makeText(TravelActivity.this,
"Enter Check-in Station", Toast.LENGTH_LONG).show();
} else {
checkinStation = checkinEditText.getText().toString();
// Enable the check-out EditText and Button
checkinEditText.setEnabled(false);
checkinEditText.setTextColor(Color.CYAN);
checkinButton.setEnabled(false);
// Disable the check-in- EdiText AND Button
checkoutEditText.setEnabled(true);
checkoutButton.setEnabled(true);
checkoutEditText.requestFocus();
}
}
});
checkoutButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (checkoutEditText.getText().toString().equals("")) {
Toast.makeText(TravelActivity.this,
"Enter Check-Out station", Toast.LENGTH_LONG)
.show();
} else {
checkoutStation = checkoutEditText.getText().toString();
// Clear edit Text
checkoutEditText.setText("");
// Enable the check-in EditText and Button
checkoutEditText.setEnabled(false);
checkoutButton.setEnabled(false);
/*
* Disable the check-out EditText and Button, to allow the
* eternal cycle of checking in and out to commence once again */
checkinEditText.setText("");
checkinEditText.setEnabled(true);
checkinButton.setEnabled(true);
checkinEditText.requestFocus();
Toast.makeText(getApplicationContext(),
"Travel information added!", Toast.LENGTH_SHORT)
.show();
}
}
});
I could implement a inner class for the two select buttons but i have diffculties to do it.Pls. provide some help how I could implement it thanks.
selectChkInButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(TravelActivity.this,
SelectStationActivity.class);
startActivityForResult(intent, SelectChkin_REQUEST_CODE);
}
});
selectChkOutButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(TravelActivity.this,SelectStationActivity.class);
startActivityForResult(intent, SelectChkout_REQUEST_CODE);
}
});
}
The onActivityResult is not responding here
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode== RESULT_OK){
if (requestCode == 1) {
checkinEditText.setText(data.getStringExtra("SELECTED_STATION_NAME"));
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuItem item = menu.add(Menu.NONE, Menu.FIRST, Menu.NONE, "Recipt");
item.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
return true;
}
public boolean OnMenuItemSelected(int featureId, MenuItem item) {
String Recipt = "Recipt" + item.getItemId() + "\nCheck-in: "
+ checkinStation + "\nCheck-Out: " + checkoutStation;
Toast.makeText(getApplicationContext(), Recipt, Toast.LENGTH_LONG)
.show();
return true;
}
protected void OnSaveInstanceState(Bundle outState) {
outState.putString("lAST_CHECKIN", checkinStation);
outState.putString("lAST_CHECKOUT", checkoutStation);
}
protected void onRestoreInstance(Bundle savedInstanceState) {
checkinStation = savedInstanceState.getString(checkinStation);
checkoutStation = savedInstanceState.getString(checkoutStation);
}
}
You Should use this
checkinEditText.setText(data.getStringExtra("SELECTED_STATION_NAME"));
as
checkinEditText.setText(data.getStringExtra("SELECTED_STATION_NAME").toString());