Android 触摸事件:当手指从物品上取下时
我需要在从项目中移除手指时实现功能。所以我需要一些活动Android 触摸事件:当手指从物品上取下时,android,events,touch,Android,Events,Touch,我需要在从项目中移除手指时实现功能。所以我需要一些活动 ***Scenario:*** 1. Touch the image view using finger. 2. Remove the finger. 3. Now implement the functionality. 我希望在第2步进行事件回调。 如果存在某个预定义事件,请建议名称。对于该场景,您可以为ImageView实现 yourImageView.setOnTouchListener(new OnTouchListener
***Scenario:***
1. Touch the image view using finger.
2. Remove the finger.
3. Now implement the functionality.
我希望在第2步进行事件回调。
如果存在某个预定义事件,请建议名称。对于该场景,您可以为ImageView实现
yourImageView.setOnTouchListener(new OnTouchListener () {
public boolean onTouch(View view, MotionEvent event) {
if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
Log.d("TouchTest", "Touch down");
}
else if (event.getAction() == android.view.MotionEvent.ACTION_UP) {
Log.d("TouchTest", "Touch up");
}
}
}
嗯。当您触摸屏幕并取下手指时,请拨打:
祝你好运 请注意,如果要在MotionEvent.ACTION\u关闭后将MotionEvent.ACTION\u打开,则应在ACTION\u关闭时返回true
public class TestTouchEvents extends Activity implements OnTouchListener {
ImageView imageView;
Bitmap bitmap;
Canvas canvas;
Paint paint;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imageView = (ImageView) this.findViewById(R.id.ImageView);
Display currentDisplay = getWindowManager().getDefaultDisplay();
float dw = currentDisplay.getWidth();
float dh = currentDisplay.getHeight();
bitmap = Bitmap.createBitmap((int) dw, (int) dh,Bitmap.Config.ARGB_8888);
canvas = new Canvas(bitmap);
paint = new Paint();
paint.setColor(Color.GREEN);
imageView.setImageBitmap(bitmap);
imageView.setOnTouchListener(this);
}
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// Do Something
Log.d("Touch", "Touch down");
break;
case MotionEvent.ACTION_MOVE:
// Do Something
Log.d("Touch", "Touch move");
//imageView.invalidate();
break;
case MotionEvent.ACTION_UP:
// Do Something
Log.d("Touch", "Touch up");
//imageView.invalidate();
break;
case MotionEvent.ACTION_CANCEL:
Log.d("Touch", "Touch cancel");
break;
default:
break;
}
return true;
}
}