Android Touch事件传递机制

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    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

　　　　} 
　　　　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

原标题：Android Touch事件传递机制

关键词：Android