Android中onTouch與onClick事件的關係

標籤：

這幾天遇到點關於Android的觸摸事件相關的，還跟onClick有關，暫且記下：

LinearLayout分別設定了onTouchListener，onClickListener，onLongClickListener及onTouchEvent回調

 

1、在螢幕上觸摸之後基本的執行流程如下：

onTouch,action=0
onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1
onClick

也就是先說onTouchListener是最先被觸發的，然後是本身的onTouchEvent回調；當最後的up事件發生並被onTouchEvent處理後才會觸發onClickListener。

 

2、把onTouchEvent回調中的super.onTouchEvent去除，直接返回true；則流程如下：

onTouch,action=0
onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1

可以看到onClickListener永遠無法被觸發，也側面說明了對onClick的觸發是在onTouchEvent回調中來實現的。

 

3、長按螢幕，流程如下：

onTouch,action=0
onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onLongClick
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1
onClick

 

當長按的時候，無需到up就會觸發onLongClick的響應，但之後也會繼續觸發onClick的響應。

 

4、但如果在onLongClick中返回true，則流程如下，即只在中間觸發了onLongClick，之後會繼續響應touch，但當up的時候就不會再觸發onClick

onTouch,action=0

onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onLongClick
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1

 

 

 

測試代碼如下：

 

[java] view plaincopyprint? 

1. public class MainActivity extends Activity {
2. @Override
3. protected void onCreate(Bundle savedInstanceState) {
4. super.onCreate(savedInstanceState);
5. setContentView(R.layout.activity_main);
6. FrameLayout frame = (FrameLayout)findViewById(R.id.container);
7. LinearLayoutTest line = new LinearLayoutTest(this);
8. line.setOnClickListener(new ClickListener());
9. line.setOnLongClickListener(new LongClickListener());
10. line.setOnTouchListener(new TouchListener());
11. line.setLongClickable(true);
12. frame.addView(line);
13. }
14. public class ClickListener implements OnClickListener {
15. @Override
16. public void onClick(View v) {
17. Log.e("test","onClick");
18. }
19. }
20. public class LongClickListener implements OnLongClickListener{
21. @Override
22. public boolean onLongClick(View v) {
23. Log.e("test","onLongClick");
24. return true;
25. }
26. }
27. public class TouchListener implements OnTouchListener{
28. @Override
29. public boolean onTouch(View v, MotionEvent event) {
30. Log.e("test","onTouch,action="+event.getAction());
31. return false;
32. }
33. }
34. }

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        FrameLayout frame = (FrameLayout)findViewById(R.id.container);        LinearLayoutTest line = new LinearLayoutTest(this);        line.setOnClickListener(new ClickListener());        line.setOnLongClickListener(new LongClickListener());        line.setOnTouchListener(new TouchListener());        line.setLongClickable(true);        frame.addView(line);    }    public class ClickListener implements OnClickListener {        @Override        public void onClick(View v) {            Log.e("test","onClick");        }    }    public class LongClickListener implements OnLongClickListener{        @Override        public boolean onLongClick(View v) {            Log.e("test","onLongClick");            return true;        }    }    public class TouchListener implements OnTouchListener{        @Override        public boolean onTouch(View v, MotionEvent event) {            Log.e("test","onTouch,action="+event.getAction());            return false;        }     }        }

[java] view plaincopyprint? 

1. public class LinearLayoutTest extends LinearLayout{
2. public LinearLayoutTest(Context context) {
3. super(context);
4. }
5. @Override
6. public boolean onTouchEvent(MotionEvent event) {
7. Log.e("test","onTouchEvent,action="+event.getAction());
8. return super.onTouchEvent(event);
9. }
10. }  

Android中onTouch與onClick事件的關係