标签：text pat his pre oid touch gen == key
Android系统按键操作最先是在dispatchKeyEvent中进行处理的，然后才是onKeyDown(int keyCode, KeyEvent event)和onKeyUp(int keyCode, KeyEvent event)。
同理，触摸操作也是先在dispatchTouchEvent中进行处理，在分发给onTouchEvent进行处理。
代码很简单，只要掌握好事件的分发顺序就ok了。
Activity中的代码：
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
Log.d("CPACM","onKeyDown");
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
Log.d("CPACM","onKeyUp");
return super.onKeyUp(keyCode, event);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
Log.d("CPACM","onTouchEvent");
return super.onTouchEvent(event);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
Log.d("CPACM","dispatchKeyEvent");
if(event.getKeyCode() == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){
if(System.currentTimeMillis() - preTime < 2000){//在两秒内，退出
return super.dispatchKeyEvent(event);
}
Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
//System.exit(0);
preTime = System.currentTimeMillis();
return true;
}
// TODO Auto-generated method stub
return super.dispatchKeyEvent(event);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
// TODO Auto-generated method stub
Log.d("CPACM","dispatchTouchEvent");
return super.dispatchTouchEvent(ev);
}
标签：text pat his pre oid touch gen == key
原文地址：http://www.cnblogs.com/ganchuanpu/p/6562088.html
