This question already has answers here:
Unfortunately MyApp has stopped. How can I solve this?
(23 answers)
Closed 1 year ago.
I am new to android dev
I have made as simple app in android (for api_version greater than 23) which fetches the name of all running apps. But the app doesn't work properly. When I click the button the functionality registered in "onClickListner" is not working.
package com.sakthi.appban;
import androidx.appcompat.app.AppCompatActivity;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.util.List;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
displayAllApps();
}
});
}
private void displayAllApps(){
PackageManager pm = getPackageManager();
List<ApplicationInfo> installedApplications = pm.getInstalledApplications(PackageManager.GET_META_DATA);
for(ApplicationInfo application : installedApplications){
Toast.makeText(this, application.name, Toast.LENGTH_SHORT).show();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
Toast.makeText(this, "Task Ended", Toast.LENGTH_SHORT).show();
}
Hope I will get help
Thanks in advance
I think you might have seen these message in logs if you run this code you will get this error when you click on the button
Error:
java.lang.IllegalStateException: You must either set a text or a view
Here application.name may get null for some of the apps. This may cause IllegalStateException because you are passing null to a Toast.
To fix this simply add an if condition to null check like this:
if(application.name != null) {
Toast.makeText(this, application.name, Toast.LENGTH_SHORT).show();
}
Then it should work.
Update:
You can remove this code from your code which causing ANR:
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
The problem is that I am trying to loop in the UI thread.
So the UI thread cannot handle the UI operation..
and my program crashed.More info here
Related
While I have seen multiple posts and blogs that it doesn't work on the emulator, I've also seen blogs stating that we can do testing on emulators which are equipped with Google Play Services. We have such emulators and I've setup one such emulator ('Play Store enabled emulators)'). Is that the correct assumption? Can I test SafetyNet API integration with such an emulator?
It runs Android 8.1.
My code is as follows (ignore silly mistakes, the code compiles in my laptop. I've just edited some parts to maintain my company's confidentiality).
In this code, the following logs print into my logcat:- About to get harmful apps and Enabled app verification. But no other log statement from this class prints. Does anyone know why?
package some.kindof.package;
import android.content.Context;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.common.api.CommonStatusCodes;
import com.google.android.gms.safetynet.SafetyNetClient;
import com.google.android.gms.safetynet.SafetyNetStatusCodes;
import com.google.android.gms.safetynet.SafetyNetApi.HarmfulAppsResponse;
import com.google.android.gms.safetynet.SafetyNetApi;
import com.google.android.gms.safetynet.HarmfulAppsData;
import com.google.android.gms.tasks.Task;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HarmfulAppsDetector {
private static final Logger LOGGER = LoggerFactory.getLogger(HarmfulAppsDetector.class);
private HarmfulAppsResponseParser parser;
public boolean checkHarmfulApps(final SafetyNetClient safetyNetClient) throws Exception {
try {
LOGGER.info("About to get harmful apps"); //This prints
try {
safetyNetClient.enableVerifyApps();
} catch (Throwable e) {
LOGGER.error("Could not enable app verification");
System.exit(0); //Assume app will exit
}
LOGGER.info("Enabled app verification"); //This prints
//Check that verify apps is enabled
try {
safetyNetClient
.isVerifyAppsEnabled()
.addOnCompleteListener(new OnCompleteListener<SafetyNetApi.VerifyAppsUserResponse>() {
#Override
public void onComplete(Task<SafetyNetApi.VerifyAppsUserResponse> task) {
LOGGER.info("Verified that app verification is enabled or not? See right below:-");
LOGGER.info("See this:- " + task.getResult().isVerifyAppsEnabled());
}
});
} catch (Throwable e) {
LOGGER.error("Error checking whether app verification is enabled", e);
}
//List harmful apps using Google's SafetyNet APIs
safetyNetClient
.listHarmfulApps()
.addOnCompleteListener(new OnCompleteListener<HarmfulAppsResponse>() {
#Override
public void onComplete(Task<HarmfulAppsResponse> harmfulAppsResponseTask) {
LOGGER.info("Task is over.");
if (harmfulAppsResponseTask.isSuccessful()) {
LOGGER.info("Was able to hit Google and get response.");
HarmfulAppsResponse result = harmfulAppsResponseTask.getResult();
LOGGER.info("Response is:- " + result);
boolean harmfulAppsExist = parser.doHarmfulAppsExist(result);
if(harmfulAppsExist) {
//Blah do something here
}
} else {
LOGGER.error("An error occurred. " +
"Call isVerifyAppsEnabled() to ensure " +
"that the user has consented.");
}
}
})
.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(Exception e) {
LOGGER.error("Task exception", e);
}
});
//Calling listHarmfulApps is now over
return true; //Just for testing, have to parse output and return that when the code actually works
} catch (Throwable e) {
LOGGER.error("Error occurred using Google for verifying harmful apps", e);
throw e;
}
}
}
Why do the async parts of the code, calls to isVerifyAppsEnabled() and listHarmfulApps(), not seem to even execute?
I'm trying to take control over the Play/Pause html DOM elements (in a browser open in a pc) from an android device.
In the html page (in Google Chrome browser) there's a <video> tag so I can control it like this:
//js code
document.querySelector("video").play();
document.querySelector("video").pause();
But I want that to run from an android device so I'm using GCM.
I read here and got some insight but I still have some questions.
First, since I'm writing in eclipse, and it sees no document variable, it produces an error. So how can eclipse recognize that element in the html page so I can compile and install the apk on the device?
Where do I specify the page url I want to communicate with? (send play/pause commands)
To run js inside java I'm using Rhino. I looked through the examples in the documentation but I'm still not sure if a #JSFunction annotation is enough to declare a js function.
Here's my code:
import com.alaa.chromote.util.SystemUiHider;
import com.google.android.gcm.GCMRegistrar;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;
import android.view.View.OnClickListener;
import org.mozilla.javascript.*;
import org.mozilla.javascript.annotations.*;
public class MainApplication extends Activity {
private final static String GCM_SENDER_ID = "484514826047";
private static final String LOG_TAG = "GetAClue::GCMIntentService";
private Button playButton;
private Button pauseButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_application);
playButton = (Button) findViewById(R.id.PlayButton);
pauseButton = (Button) findViewById(R.id.PauseButton);
playButton.setVisibility(View.INVISIBLE);
pauseButton.setVisibility(View.VISIBLE);
//connect to gcm
GCMRegistrar.checkDevice( this );
GCMRegistrar.checkManifest( this );
final String regId = GCMRegistrar.getRegistrationId( this );
if( regId.equals( "" ) ) {
GCMRegistrar.register( this, GCM_SENDER_ID );
}
else {
Log.v( LOG_TAG, "Already registered" );
}
Context.enter(); //start Rhino
setupListeners();
}
#JSFunction
public void play() { document.querySelector("video").play(); }
#JSFunction
public void pause() { document.querySelector("video").pause(); }
private void setupListeners()
{
playButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
play();
}
});
pauseButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
pause();
}
});
}
#Override
protected void onStop() {
Context.exit(); //stop Rhino
super.onStop();
}
}
How do I continue from here?
First, since I'm writing in eclipse, and it sees no document variable, it produces an error. So how can eclipse recognize that element in the html page so I can compile and install the apk on the device?
answ: On your android device you just pass a message to the chrome browser. A.k. an action variable that is set to play or stop. You chrome app will then pick up the message and act accordingly. Also you can send the url as an variable in the message if you want to be able to play different urls.
Where do I specify the page url I want to communicate with? (send play/pause commands)?
answ: Do you already created the chrome app you want and verified it works? It should check with a google cloud server for messages. That server keeps track of the url for you.
To run js inside java I'm using Rhino. I looked through the examples in the documentation but I'm still not sure if a #JSFunction annotation is enough to declare a js function.?
answ: It seems you are misunderstanding the part what the android app does (sending the play action) and what the chrome browser does (actually playing the movie)
I hope my answer has helped a little, feedback is appreciated :)
I have developed a application connect with wi-fi. In that app portrait/landscape transition restart the activity when rotate the phone and interrupt the socket connection. Then I add portrait to AndroidManifest.xml file then problem have been solved. I want to know that is portrait/landscape transition effect to Async-Task also?
<activity
android:name="login"
android:label="#string/login_title"
android:configChanges="orientation|screenSize" >
</activity>
Login.java file
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class login extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
try{
Button buttonSignin = (Button) this.findViewById(R.id.btnSignIn);
//This is the place gives nullpointerException
buttonSignin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
EditText user=(EditText) findViewById(R.id.txtUserName);
EditText pass=(EditText) findViewById(R.id.txtPassword);
if(user.getText().toString()== "")
{
return;
}
else if(pass.getText().toString()== "")
{
return;
}
else
{
LoginRequest reqs_login = new LoginRequest(login.this,login.this);
reqs_login.where="Login_Data";
reqs_login.title="Login";
reqs_login.username=user.getText().toString();
reqs_login.password=pass.getText().toString();
reqs_login.execute();
}
}
});
} catch (NullPointerException e) {
e.printStackTrace();
//Toast.makeText(getBaseContext(), "Error:1 on uplod file", Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
//Toast.makeText(getBaseContext(), "Error:2 File may be already exists", Toast.LENGTH_LONG).show();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
}
Use this in your AndroidManifest.xml activity,
android:configChanges="orientation|screenSize"
working for me in AsyncTask also
I guess the Answer would be NO because the Async task (Background task) once started executing inBackground it will not stop until complete execution of that code in background. No matter App is in whichever State , Even the App is minimized it does not affect the Async Task. So Changing Landscape / Portrait mode will not affect the AsyncTAsk (InBackground) method. hope this will help...
What is the best way to retain active objects—such as running Threads, Sockets, and AsyncTasks—across device configuration changes?
Deprecated: Override onRetainNonConfigurationInstance()
transferring an active object across Activity instances was merely a matter of returning the active object in onRetainNonConfigurationInstance() and retrieving it in getLastNonConfigurationInstance(). As of API 13, these methods have been deprecated in favor of the more Fragment's setRetainInstance(true/false)
Recommended: Manage the Object Inside a Retained Fragment
Fragment#setRetainInstance(true) allows us to bypass this destroy-and-recreate cycle
For more details please go through the below
Handling Configuration Changes
Hope this will help you.
I want to ask how I can use speech to text code on my emulator. My codes work on real device but not work on emulator. The error said :
No Activity found to handle Intent { act=android.speech.action.RECOGNIZE_SPEECH (has extras) }
What can I do?
package net.viralpatel.android.speechtotextdemo;
import java.util.ArrayList;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.Menu;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
protected static final int RESULT_SPEECH = 1;
private ImageButton btnSpeak;
private TextView txtText;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtText = (TextView) findViewById(R.id.txtText);
btnSpeak = (ImageButton) findViewById(R.id.btnSpeak);
btnSpeak.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(
RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, "en-US");
try {
startActivityForResult(intent, RESULT_SPEECH);
txtText.setText("");
} catch (ActivityNotFoundException a) {
Toast t = Toast.makeText(getApplicationContext(),
"Ops! Your device doesn't support Speech to Text",
Toast.LENGTH_SHORT);
t.show();
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RESULT_SPEECH: {
if (resultCode == RESULT_OK && null != data) {
ArrayList<String> text = data
.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
txtText.setText(text.get(0));
}
break;
}
}
}
}
You need to install onto your emulator an app that contains an Activity that handles the RECOGNIZE_SPEECH-intent. You might be able to find Google's VoiceSearch.apk on the web.
There are certain things you can't test using an emulator. Speech to text is on of them.
I'm not sure about this, but you can't use this android feature with the emulator.
No matter what, you should handle this exception with a try/ catch an give some feedback to the user.
You can check if there is that Activity in current device running your app doing something like:
PackageManager pm = context.getPackageManager();
List<ResolveInfo> infoList = pm.queryIntentActivities(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
if (infoList.size() == 0) {
/** Show some feedback to user if there is the activity. Something like "Your device is not abl to run this feature..."*/
}else{
/**Your current code goes here.*/
}
Let me know if it helps.
You need to install com.google.android.voicesearch application on target device which has no voice recognition activity like:
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=com.google.android.voicesearch"));
startActivity(browserIntent);
if you try to install Google's Search app - it won't help since it doesn't contain the VR engine inside and thus it will try to do the same - install com.google.android.voicesearch app but it could fail due to a bug in package name (pname:com.google.android.voicesearch instead of just pure package name). However com.google.android.voicesearch installation might be impossible due to "Not available in your country".
You might need a virtual SD Card. You can refer here
I'm trying to record sound using Android Emulator. I know that this question is popular over the internet, I checked many posts, it seems that only one person succeded: Can the Android emulator record and play back audio using pc hardware?. (it think he used
File fTmFile; insteadof String fTmpFile;
which i also tried). And following Philip's advice and the official site tutorial http://developer.android.com/guide/topics/media/audio-capture.html and also other resources, I'm still not able to record. My application throws exception at line:
fMediaRecorder.prepare();
more exactley, this is what I first get:
W/System.err(1042): java.io.FileNotFoundException: /mnt/sdcard/audiorecordtest.3gp (Permission denied)
which makes me think is something wrong with the storage location, because even I added 'SD Card Support' property for the emulator with size 256 MiB, I'm not able to acces it, furthermore I can see in the emulator the message: "Your phone does not have a SD Card inserted" when I go to Music.
I added both audio record and external storage permissions, in AndroidManifest.xml and both audio (record+playback) hardware settings to the emulator 2.3.3 on Win 7. Is anything wrong within my app, the way I storage the file or something else? Please, if anybody has any idea feel free to share, it will be appreciated.
Here is the full source code:
import java.io.File;
import java.io.FileDescriptor;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class RecordSoundActivity extends Activity {
private MediaRecorder fMediaRecorder = null;
private Button btnrecord;
private Button btnstop;
String fTmpFile;
public RecordSoundActivity() {
fTmpFile = Environment.getExternalStorageDirectory().getPath();
fTmpFile += "/audiorecordtest.3gp";
}
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnrecord = (Button) findViewById(R.id.button1);
btnstop = (Button) findViewById(R.id.button2);
btnrecord.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(RecordSoundActivity.this, "Recording...", Toast.LENGTH_LONG).show();
Recording();
}
});
btnstop.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
fMediaRecorder.stop();
fMediaRecorder.release();
}
});
}
public void Recording() {
fMediaRecorder = new MediaRecorder();
fMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
fMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
fMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
fMediaRecorder.setAudioChannels(1);
fMediaRecorder.setAudioSamplingRate(8000);
fMediaRecorder.setOutputFile(fTmpFile);
try {
fMediaRecorder.prepare();
} catch (IOException e) {
// TODO: handle exception
e.printStackTrace();
}
try {
fMediaRecorder.start();
} catch (IllegalStateException e) {
// TODO: handle exception
e.printStackTrace();
}
//fMediaRecorder.stop();
//fMediaRecorder.release();
}
}
Try and see if it works for Android 4.0. I know I had some issues with the camera in the emulator, in lower version (Lower than 4.0) it just wouldn't recognize my laptop webcam. But when I tried it on 4.0, when the AVD was loading a popup message came and asked me if I want to connect the webcam to the AVD, and once I agreed it worked.
Another poster in SO asked this question too, about the camera, and changing the AVD version to 4.0 did help him.
Maybe its the same for audio recording too, as both are external hardware for the typical PC.