单击时更改的按钮

Question

Button onTouchLitsener does not change when clicked. I want the button to change when clicked.

    public class SoundActivity extends Activity implements OnTouchListener {
    /** Called when the activity is first created. */
    MediaPlayer mp;
    MediaPlayer mp1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setVolumeControlStream(AudioManager.STREAM_MUSIC);


        final Button zero = (Button) this.findViewById(R.id.button1);
        zero.setOnTouchListener(this);

        mp = MediaPlayer.create(this, R.raw.song_3);

        //final ImageButton zero = (ImageButton) this.findViewById(R.id.imageButton1);
        //zero.setOnTouchListener(this);

        //mp = MediaPlayer.create(this, R.raw.song_3);
    }

    @Override
    public boolean onTouch(View v, MotionEvent event)
    {  
        switch (event.getAction())
        {
        case MotionEvent.ACTION_DOWN:
        {
            mp.setLooping(true);
            mp.start();
        }
        break;
        case MotionEvent.ACTION_UP:
        {
            mp.pause();
        }
        break;
    }
    return true;
    }
    //public boolean onTouchEvent(View v, MotionEvent event) {
        //ImageView iv = (ImageView) v;

       // if (event.getAction() == MotionEvent.ACTION_DOWN) {
           // iv.setImageResource(R.drawable.arrow_leftpressed);
           // return true;
        //} else if (event.getAction() == MotionEvent.ACTION_UP) {
           // iv.setImageResource(R.drawable.arrow_left);
            //return true;
        //}

        //return false;
    //}

    public boolean onTouchEvent(View v, MotionEvent event) {
        Button zero = (Button) v;

        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            zero.setBackgroundResource(R.drawable.arrow_leftpressed);
            return true;
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            zero.setBackgroundResource(R.drawable.arrow_left);
            return true;
        }
        return false;
    }

}

my xml file

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="button"
        android:clickable="true"
         />

    <ImageButton
        android:id="@+id/imageButton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/button4"
        android:clickable="true"
         />

</LinearLayout>

Answer 1

I'd recommend to use an onClickListener .

The onTouchListener is receiving two events when pressing the Button - ACTION_DOWN when you're touching it and ACTION_UP when releasing. So the player starts and stops right after that.

Answer 2

You have written button code in wrong block.

you have written zero.setOnTouchListener(this); so whenever you will touch button onTouch will get called not onTouchEvent

So add button code in onTouch.

Make following change in your code.

Remove this entire block

public boolean onTouchEvent(View v, MotionEvent event) {
        Button zero = (Button) v;

        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            zero.setBackgroundResource(R.drawable.arrow_leftpressed);
            return true;
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            zero.setBackgroundResource(R.drawable.arrow_left);
            return true;
        }

        return false;
    }

Move above code in onTouch block.Below is how it should be.

@Override
    public boolean onTouch(View v, MotionEvent event) {
        Button zero = (Button) v;

        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            zero.setBackgroundResource(R.drawable.arrow_leftpressed);
            return true;
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            zero.setBackgroundResource(R.drawable.arrow_left);
            return true;
        }

        return false;
    }