Android Touch事件传递机制 一： OnTouch，OnItemClick（监听器），dispatchTouchEvent（伪生命周期）

	ViewGroup	View	Activity
dispatchTouchEvent	有	有	有
onInterceptTouchEvent	有	无	无
onTouchEvent	有	有	有

 

 

例子零： 只有OnTouch和OnItemClick

        actualListView.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    return false;  //这儿是true，下面是false，onItemClick会走

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    return true;  //上面随意，只要这个地方返回true，onItemClick就不会走
                }
                return false;
            }
        });
        actualListView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                Toast.makeText(MainActivity.this, "setOnClickListener", 
                        Toast.LENGTH_SHORT).show();
            }
            
        });

 

 

 

 

例子一：  只有OnTouch和OnItemClick

actualListView.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    break;

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    break;
                }
                return false;   //返回false之后
　　　　　　} 
}); 
actualListView.setOnItemClickListener(new OnItemClickListener() { 

　　　　　　@Override 
　　　　　　public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
　　　　　　　　 Toast.makeText(MainActivity.this, "setOnClickListener", Toast.LENGTH_SHORT).show(); 
　　　　　　} 
});

 

先走ACTION_DOWN，ACTION_UP，最后走onItemClick。

 

 

例子二：只有OnTouch和OnItemClick

actualListView.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    break;

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    break;
                }
                return true;      //返回true之后 
　　　　　　}
 }); 

actualListView.setOnItemClickListener(new OnItemClickListener() {

　　　　　　 @Override 
　　　　　　 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
　　　　　　　　　　 Toast.makeText(MainActivity.this, "setOnClickListener", Toast.LENGTH_SHORT).show(); 
　　　　　　　} 
});

先走ACTION_DOWN，ACTION_UP，   onItemClick不走

 

例子三：只有OnTouch和OnItemClick和dispatchTouchEvent

@Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "dispatch DOWN", 
                    Toast.LENGTH_SHORT).show();
            break;

        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "dispatch UP", 
                    Toast.LENGTH_SHORT).show();
            break;
        }
        
        return super.dispatchTouchEvent(ev);
    }

actualListView.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    break;

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    break;
                }
                return false;   //返回false之后
　　　　　　} 
});

actualListView.setOnItemClickListener(new OnItemClickListener() { 

　　　　　　@Override 
　　　　　　public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
　　　　　　　　 Toast.makeText(MainActivity.this, "setOnClickListener", Toast.LENGTH_SHORT).show(); 
　　　　　　} 
});

先走dispatchTouchEvent的ACTION_DOWN------------>OnTouch的ACTION_DOWN------------->dispatchTouchEvent的ACTION_UP

----------------->OnTouch的ACTION_UP----------------->onItemClick

 

 

 

 

 

例子四：只有OnTouch和OnItemClick和dispatchTouchEvent

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "dispatch DOWN", 
                    Toast.LENGTH_SHORT).show();
            break;

        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "dispatch UP", 
                    Toast.LENGTH_SHORT).show();
            break;
        }
        
        return super.dispatchTouchEvent(ev);
    }

actualListView.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    break;

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    break;
                }
                return true;      //返回true之后 
　　　　　　}
 }); 

actualListView.setOnItemClickListener(new OnItemClickListener() {

　　　　　　 @Override 
　　　　　　 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
　　　　　　　　　　 Toast.makeText(MainActivity.this, "setOnClickListener", Toast.LENGTH_SHORT).show(); 
　　　　　　　} 
});

先走dispatchTouchEvent的ACTION_DOWN------------>OnTouch的ACTION_DOWN------------->dispatchTouchEvent的ACTION_UP

----------------->OnTouch的ACTION_UP

 

 

 

 

 

 

例子五：只有OnTouch和OnItemClick和dispatchTouchEvent

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "dispatch DOWN", 
                    Toast.LENGTH_SHORT).show();
            return true;    //这儿无论是true还是false，都会导致OnTouch和OnItemClick不走，因为没有下面的super来分发事件在activity中的操作

        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "dispatch UP", 
                    Toast.LENGTH_SHORT).show();
            return true;   //这儿无论是true还是false，都会导致OnTouch和OnItemClick不走，因为没有下面的super来分发事件在activity中的操作

　　　　} 
　　　　return super.dispatchTouchEvent(ev); 
}

actualListView.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    break;

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    break;
                }
                return false;   //返回false之后
　　　　　　} 
});

actualListView.setOnItemClickListener(new OnItemClickListener() { 

　　　　　　@Override 
　　　　　　public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
　　　　　　　　 Toast.makeText(MainActivity.this, "setOnClickListener", Toast.LENGTH_SHORT).show(); 
　　　　　　} 
});

先走dispatchTouchEvent的ACTION_DOWN---------------------->dispatchTouchEvent的ACTION_UP

 

 

 

 

例子六：有OnTouch和OnItemClick    和  dispatchTouchEvent和onTouchEvent

@Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "dispatch DOWN", 
                    Toast.LENGTH_SHORT).show();
            break;
        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "dispatch UP", 
                    Toast.LENGTH_SHORT).show();
            break;
        }
        
        return super.dispatchTouchEvent(ev);
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Toast.makeText(MainActivity.this, "EveUP", 
                Toast.LENGTH_SHORT).show();
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "Event DOWN", 
                    Toast.LENGTH_SHORT).show();
            return true;
        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "Event UP", 
                    Toast.LENGTH_SHORT).show();
            return true;
        }
        return super.onTouchEvent(event);
    }


    Button button = (Button) findViewById(R.id.go_shopping);//这儿改为CLICKABLE的imageview结果一样
        button.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    return false;  //这儿是true，下面是false，onItemClick会走

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    return false;  //上面随意，只要这个地方返回true，onItemClick就不会走
                }
                return false;
            }
        });
        button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "setOnClickListener", 
                        Toast.LENGTH_SHORT).show();                
            }
        });

先走dispatchTouchEvent的ACTION_DOWN------------>OnTouch的ACTION_DOWN------------->dispatchTouchEvent的ACTION_UP

----------------->OnTouch的ACTION_UP------------>OnClickListener

activity的伪生命周期onTouchEvent没有走，是因为button的onTouchEvent把事件消费了，

 

　

例子七：有OnTouch和OnItemClick    和  dispatchTouchEvent和onTouchEvent

 

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "dispatch DOWN", 
                    Toast.LENGTH_SHORT).show();
            break;
        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "dispatch UP", 
                    Toast.LENGTH_SHORT).show();
            break;
        }
        
        return super.dispatchTouchEvent(ev);
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Toast.makeText(MainActivity.this, "EveUP", 
                Toast.LENGTH_SHORT).show();
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "Event DOWN", 
                    Toast.LENGTH_SHORT).show();
            return true;
        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "Event UP", 
                    Toast.LENGTH_SHORT).show();
            return true;
        }
        return super.onTouchEvent(event);
    }


        Button button = (Button) findViewById(R.id.go_shopping);  //这儿改为imageview结果一样
        button.setOnTouchListener(new OnTouchListener() {
            
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    Toast.makeText(MainActivity.this, "DOWN", 
                            Toast.LENGTH_SHORT).show();
                    return false;  //这儿是true，下面是false，onItemClick会走

                case MotionEvent.ACTION_UP:
                    Toast.makeText(MainActivity.this, "UP", 
                            Toast.LENGTH_SHORT).show();
                    return true;  //上面随意，只要这个地方返回true，onItemClick就不会走
                }
                return false;
            }
        });
        button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "setOnClickListener", 
                        Toast.LENGTH_SHORT).show();                
            }
        });

 

先走dispatchTouchEvent的ACTION_DOWN------------>OnTouch的ACTION_DOWN------------->dispatchTouchEvent的ACTION_UP

----------------->OnTouch的ACTION_UP

button的OnClickListener没走，是因为onTouch 在ACTION_UP中返回true，把事件给消费了，导致button的onTouchEvent没走，连带的button的OnClick

也没有走。

activity的伪生命周期onTouchEvent没有走，是因为button的onTouch把事件消费了。

　

 

 

 

例子八：有 dispatchTouchEvent和onTouchEvent

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "dispatch DOWN", 
                    Toast.LENGTH_SHORT).show();
            break;
        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "dispatch UP", 
                    Toast.LENGTH_SHORT).show();
            break;
        }
        
        return super.dispatchTouchEvent(ev);
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Toast.makeText(MainActivity.this, "EveUP", 
                Toast.LENGTH_SHORT).show();
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this, "Event DOWN", 
                    Toast.LENGTH_SHORT).show();
            return true;
        case MotionEvent.ACTION_UP:
            Toast.makeText(MainActivity.this, "Event UP", 
                    Toast.LENGTH_SHORT).show();
            return true;
        }
        return super.onTouchEvent(event);
    }

Button button = (Button) findViewById(R.id.go_shopping);
//不给button设置ontouch和onclick

先走dispatchTouchEvent的ACTION_DOWN----------------->dispatchTouchEvent的ACTION_UP

activity的伪生命周期onTouchEvent没有走，是因为button的dispatchTouchEvent------>onTouchEvent把事件消费了。即使没有ontouch，事件也会被

button给消费掉

viewgroup（listview）和view（button）一样，其onTouchEvent会把事件给消费了，和view(imageview)不一样。

要想activity的伪生命周期onTouchEvent可以走的话，可以把button改为imageview，因为imageview不是“可按的CLICKABLE”，所以会imageview的onTouchEvent会return个false，不会消费掉这个事件 

会先走dispatchTouchEvent的ACTION_DOWN------------>onTouchEvent的ACTION_DOWN------------->dispatchTouchEvent的ACTION_UP

----------------->onTouchEvent的ACTION_UP

 

 

 

点击一个ViewGrounp中的Button，事件的传递

Activity的dispatchTouchEvent（返回true或false都会导致事件不会分发，要返回super）----->ViewGrounp的dispatchTouchEvent-------->ViewGrounp的onInterceptTouchEvent()(返回false不拦截)--------->Button的dispatchTouchEvent------------->Button的setOnTouchListener(在up/down时如果返回false)------------->Button的onTouchEvent默认返回true消费事件(imageview默认返回false，事件会向上传/第二个事件的传递看我的另一个文章Android Touch事件传递机制 二)------>Button的setOnClickListener（在onTouchEvent中的up时调用）

 

Activity的dispatchTouchEvent（返回true或false都会导致事件不会分发，要返回super）----->ViewGrounp的dispatchTouchEvent-------->ViewGrounp的onInterceptTouchEvent()(返回false不拦截)--------->Button的dispatchTouchEvent------------->Button的setOnTouchListener(在up/down时如果返回true)消费事件结束

 

Activity的dispatchTouchEvent（返回true或false都会导致事件不会分发，要返回super）----->ViewGrounp的dispatchTouchEvent-------->ViewGrounp的onInterceptTouchEvent()(返回false不拦截)--------->Button的dispatchTouchEvent(Button的setOnTouchListener为null)------------->Button的onTouchEvent默认返回true----------->Button的setOnClickListener（在onTouchEvent中的up时调用）