Showing error Caused by: java.lang.reflect.InvocationTargetException

Question

When I press the button(named \"current location\") it should shows current location(lat & long) on the textview(named \"tvAddress\") .But it\'s not working as I expect. It\

Answer 1

You are calling findViewById before setting the View, so when you call tvAddress.setText, tvAddress is null. Start with this code instead :

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.map);

    manager = (LocationManager) getSystemService(LOCATION_SERVICE);
    tvAddress = (TextView) findViewById(R.id.tvaddress);
    btncurrent= (Button)findViewById(R.id.btncurrent);

    locationClient = new LocationClient(this, this, this);


}

Also, you got the error wrong, the real cause is this :

Caused by: java.lang.NullPointerException
    at com.mamun.tasktest.MapActivity.marker(MapActivity.java:129)

Take your time to read the stack trace carefully and look for places where it points to classes you wrote, it is always a good place to start for investigating bugs ;)