Multi tool use

crash ActivityCompat.requestPermissions(this,new String{Manifest.permission.ACCESS_FINE_LOCATION}, 1)

When I include this line I get error(crash)
ActivityCompat.requestPermissions(this,new String{Manifest.permission.ACCESS_FINE_LOCATION}, 1);

logcat

07-02 00:41:56.478 24745-24745/com.example.root.securityalert E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.root.securityalert, PID: 24745
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.root.securityalert/com.example.root.securityalert.DeviceScanActivity}: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2678)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6165)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778)
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
at com.example.root.securityalert.DeviceScanActivity.onRequestPermissionsResult(DeviceScanActivity.java:213)
at android.app.Activity.requestPermissions(Activity.java:4120)
at com.example.root.securityalert.DeviceScanActivity.onCreate(DeviceScanActivity.java:142)
at android.app.Activity.performCreate(Activity.java:6687)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2631)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2743) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1490) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6165) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:778) 


code. It is making blue tooth adapter and manager.Then request permission. Then starts scan on onRequestPermissionsResult. Ihave attached requestPermissions for both ACCESS_COARSE_LOCATION and ACCESS_FINE_LOCATION

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.main);


mHandler = new Handler();

//mSend=new BluetoothSendRecv(cntxt);
mActvty= this.getParent();
visible = this.getIntent();

// Use this check to determine whether BLE is supported on the device. Then you can
// selectively disable BLE-related features.
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
finish();
}
mBluetoothManager =(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = mBluetoothManager.getAdapter();
// Checks if Bluetooth is supported on the device.
if (mBluetoothAdapter == null ) {
Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
finish();
return;
} // Initializes a Bluetooth adapter. For API level 18 and above, get a reference to
// BluetoothAdapter through BluetoothManager.

if( !mBluetoothAdapter.isEnabled())
{
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth, 1);
}
if( !mBluetoothAdapter.isDiscovering()) {
Intent discoverableIntent =
new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
}
// Construct the data source

ArrayList<ViewHolder> arrayOfUsers = new ArrayList<ViewHolder>();

// Create the adapter to convert the array to views

adapter = new UsersAdapter(this, arrayOfUsers);
cntxt=this.getApplicationContext();
ListView listView = (ListView) findViewById(R.id.mobile_list);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
ViewHolder entry= (ViewHolder) parent.getAdapter().getItem(position);
mAddress = entry.deviceAddress;
Toast.makeText(cntxt, mAddress, Toast.LENGTH_SHORT).show();
Intent i = new Intent(cntxt, BluetoothLeService.class);
cntxt.startService(i);
bindService(i, mConnection, BIND_AUTO_CREATE);; //if checked, start service
//final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
//mBluetoothService.mBluetoothDeviceAddress=address;
//mBluetoothService.mBluetoothManager=mBluetoothManager;
//mBluetoothService.mBluetoothAdapter = mBluetoothAdapter;
//mBluetoothService.mBluetoothGatt.connect();
/*mBluetoothService.mBluetoothGatt = */
//mSend.mBluetoothGatt=device.connectGatt(mActvty/*cntxt*/, false, mSend.mGattCallback);
//mSend.mBluetoothDeviceAddress=address;
//mSend.mBluetoothManager=mBluetoothManager;
//mSend.mBluetoothAdapter = mBluetoothAdapter;
//mSend.mBluetoothGatt.connect();
//mBluetoothService.mBluetoothGatt=mBluetoothGatt;
//Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
}});

/*if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {*/
ActivityCompat.requestPermissions(this, new String{Manifest.permission.ACCESS_FINE_LOCATION}, 123);
//}

requestPermissions(new String{Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_COARSE_LOCATION);
ViewHolder newUser2 = new ViewHolder("adtv2","vvg2");
adapter.add(newUser2);

}
ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {
//Toast.makeText(Client.this, "Service is disconnected", 1000).show();
mBounded = false;
mBluetoothService = null;
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
//Toast.makeText(Client.this, "Service is connected", 1000).show();
mBounded = true;
BluetoothLeService.LocalBinder mLocalBinder = (BluetoothLeService.LocalBinder)service;
Toast.makeText(cntxt, "Mithun", Toast.LENGTH_SHORT).show();
mBluetoothService = mLocalBinder.getService();
if (!mBluetoothService.initialize()) {
//Log.e(TAG, "Unable to initialize Bluetooth");
finish();
}
// Automatically connects to the device upon successful start-up
// initialization.
mBluetoothService.connect(mAddress);
}
};
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions, @NonNull int grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_COARSE_LOCATION: {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted, yay! Start the Bluetooth device scan.
scanLeDevice(true);
} else {
// Alert the user that this application requires the location permission to perform the scan.
}
}
}
}


<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

DeviceScanActivity.onRequestPermissionsResult

1 Answer
1

You access grantResults[0] in onRequestPermissionsResult without checking that grandResults.length != 0 It appears that in your error case grantResults is empty (thus the ArrayIndexOutOfBoundsException: length=0; index=0 error). Here's an example of how you could check for this case.

grantResults[0]

onRequestPermissionsResult

grandResults.length != 0

grantResults

ArrayIndexOutOfBoundsException: length=0; index=0

if (grantResults.length > 0 && // alternately check that length == 1
grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted, yay! Start the Bluetooth device scan.
scanLeDevice(true);
} else {
// Alert the user that this application requires the location permission to perform the scan.
}


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