Android: onTouch() never gets called?
android
Solution
For the first case, the right way would be:
MyImageView image = new MyImageView(this, textview);
image.setImageResource(R.drawable.icon);
image.setOnTouchListener(image);
or call `setOnTouchListener(this)` inside your MyImageView class.
Problem
I am playing with UI Event Handling, and I have found something that I cannot find the explanation from the Android Dev: I have an ImageView, and a TextView , whenever I touch on the ImageView, the TextView show a message. But the following codes doesn't work: ``` public class ShowSomething extends Activity { private LinearLayout ll; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LinearLayout ll = (LinearLayout)findViewById(R.id.linearLayout); final TextView textview = (TextView)findViewById(R.id.textview); MyImageView image = new MyImageView(this, textview); image.setImageResource(R.drawable.icon); ll.addView(image, 48, 48); } } ``` And MyImageView.java ``` public class MyImageView extends ImageView implements OnTouchListener{ private TextView textview; public MyImageView(Context context,TextView textview) { super(context); this.textview = textview; } @Override public boolean onTouch(View v, MotionEvent event) { textview.setText("Event captured !"); return true; } } ``` main.xml ``` <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/linearLayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/textview" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Holder" /> </LinearLayout> ``` But when I attach an OnTouchListener on the MyImageView like this, it does work: File ShowSomething.java ``` public class ShowSomething extends Activity { private LinearLayout ll; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LinearLayout ll = (LinearLayout)findViewById(R.id.linearLayout); final TextView textview = (TextView)findViewById(R.id.textview); MyImageView image = new MyImageView(this,textview); image.setImageResource(R.drawable.icon); image.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { textview.setText("Event captured!"); return false; } }); ll.addView(image, 48, 48); } } ``` And file MyImageView.java ``` public class MyImageView extends ImageView { private TextView textview; public MyImageView(Context context,TextView textview) { super(context); this.textview = textview; } } ``` But as far as I know, the 2 implementation is the same (implement an Event Listener) - do I misunderstand anything ?