I work on app that acts like phone guard and should run on startup (or when launched by user) and keep running until user manually won't finish it. When application started (after device boot completed) i use moveTaskToBack for hiding it in background. After about ~12 seconds my application stop working (killed by system i suspect) without any notice, no logs at all (but still stay in history stack). Checked by app timer with log, and also when i start programm by clicking icon - new instance runs. As i noticed, if i execute moveTaskToBack from Handler which delayed even by 500ms - app won't be killed! Tested on galaxy tab 2 (4.1.2) and on alcatel one touch (2.3.6). Here the sample code for reproduce:
MainActivity
public class MainActivity extends Activity
{
Timer timerCheck;
int ticks = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
timerCheck = new Timer();
timerCheck.schedule(taskCheck, 0, 1000);
if (IsStartup())
moveTaskToBack(true);
// if (IsStartup())
// {
// new Handler().postDelayed(new Runnable()
// {
// @Override
// public void run()
// {
// moveTaskToBack(true);
// }
// }, 1000);
// }
}
TimerTask taskCheck = new TimerTask()
{
@Override
public void run()
{
runOnUiThread(timerTickCheck);
}
private Runnable timerTickCheck = new Runnable()
{
public void run()
{
Log.e("testapp", "alive for " + ++ticks * 1000 + " ms");
}
};
};
private boolean IsStartup()
{
return getIntent().hasExtra("startup");
}
}
StartupReceiver
public class StartupReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context c, Intent i)
{
Intent in = new Intent();
in.setClassName("com.example.startuptest",
"com.example.startuptest.MainActivity");
in.putExtra("startup", "1");
in.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_SINGLE_TOP);
c.startActivity(in);
}
}
manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.startuptest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver android:name="com.example.startuptest.StartupReceiver" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<activity
android:name="com.example.startuptest.MainActivity"
android:label="@string/app_name"
android:launchMode="singleTop" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
So there is my questions - why android system has such behavior? Anyway to instantly hide app on startup?
