I have created app that detects otg cable,when otg cable is plugged in or out popup message appears that says otg connected or otg disconnected.How to make that popup appears when button on toolbar is clicked,popup message should only appear in action bar when otg cable is not connected,when it's connected it's should be hidden?
public class MainActivity extends AppCompatActivity
{
private Process suProcess;
public static final String IS_CONNECTED_KEY = "isConnectedValue";
public void startOtgService()
{
startService(new Intent(MainActivity.this, OtgService.class));
}
public void stopOtgService()
{
stopService(new Intent(MainActivity.this, OtgService.class));
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button_autootg);
button.setTag(0);
button.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
button.setText("");
final int status = (Integer) view.getTag();
switch (status)
{
case 0:
startOtgService();
button.setText("OTG Service Enabled");
button.setBackgroundColor(Color.GREEN);
view.setTag(1);
break;
case 1:
stopOtgService();
button.setText("OTG Service Disabled");
button.setBackgroundColor(Color.RED);
view.setTag(0);
break;
}
}
});
}
private void getRoot()
{
try
{
suProcess = Runtime.getRuntime().exec("su");
}
catch (IOException e)
{
}
}
@Override
protected void onNewIntent(Intent intent)
{
if (intent.getExtras() == null)
{
super.onNewIntent(intent);
Log.e("###", "No extras");
return;
}
if (intent.hasExtra(IS_CONNECTED_KEY))
{
Log.e("###", "Displaying dialog");
boolean isConnected = intent.getExtras().getBoolean(IS_CONNECTED_KEY);
final AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("Otg state changed");
if (isConnected)
alertDialog.setMessage("OTG connected");
else
alertDialog.setMessage("OTG disconnected");
alertDialog.show();
}
else
{
Log.e("###", "Does not contain key");
super.onNewIntent(intent);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
int id = item.getItemId();
if (id == R.id.action_settings)
{
return true;
}
if(id == R.id.action_cable)
{
}
return super.onOptionsItemSelected(item);
}
}
public class OtgService extends Service
{
private boolean mOtgConnected = false;
private Handler mHandler;
Timer taskTimer = new Timer();
TimerTask task = new TimerTask()
{
private int last_Length = -1;
@Override
public void run()
{
Context context = OtgService.this.getBaseContext();
File directory = new File("/sys/bus/usb/devices");
File[] contents = directory.listFiles();
int conn_length = contents.length;
if(conn_length ==last_Length)
{
return;
}
else
{
last_Length = conn_length;
}
if(conn_length == 0)
{
mOtgConnected = false;
mHandler.post(flagChangedTask);
}
else if (conn_length > 0) //Might get a -1
{
mOtgConnected = true;
mHandler.post(flagChangedTask);
}
if(conn_length == 0)
{
displayDialog(false);
}
else if (conn_length > 0) //Might get a -1
{
displayDialog(true);
}
}
};
//Will post this to the main thread
Runnable flagChangedTask = new Runnable()
{
@Override
public void run()
{
if (mOtgConnected)
Toast.makeText(OtgService.this,"otg connected",Toast.LENGTH_SHORT).show();
else
Toast.makeText(OtgService.this,"otg not connected",Toast.LENGTH_SHORT).show();
}
};
public OtgService()
{
}
public void displayDialog(boolean isConnected)
{
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra(MainActivity.IS_CONNECTED_KEY, isConnected);
startActivity(intent);
}
private void onStartCompat(Intent intent)
{
Log.e("###", "Starting service!");
if (mHandler == null)
mHandler = new Handler(getMainLooper());
taskTimer.scheduleAtFixedRate(task, 0, 1000);
}
// This is the old onStart method that will be called on the pre-2.0
// platform. On 2.0 or later we override onStartCommand() so this
// method will not be called.
@Override
public void onStart(Intent intent, int startId)
{
onStartCompat(intent);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
onStartCompat(intent);
// We want this service to continue running until it is explicitly
// stopped, so return sticky.
return START_STICKY;
}
@Override
public void onDestroy()
{
//task.cancel();
}
@Override
public IBinder onBind(Intent intent)
{
return null;
}
}
