2019独角兽企业重金招聘Python工程师标准>>> 
一.按键事件处理,事件传递模型
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
//按键按下的时候;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
Log.e("---------","onKeyDown");
return super.onKeyDown(keyCode, event);
}
//按键松开
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
Log.e("---------","onKeyUp");
return super.onKeyUp(keyCode, event);
}
//按键长按的时候;
@Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
Log.e("---------","onKeyLongPress");
return super.onKeyLongPress(keyCode, event);
}
}如果按下返回键的时候:
onKeyDown--->onKeyUp
源码分析:
Activity: onKeyDown()
event.startTracking();//计数
Activity：对于我们回退键的处理： down:计数 up:判断是否计数过 如果计数过 那么就退出
return false: 就是应用层没有处理了事件,继续传递.-->相应给驱动层
return true:就表示事件,就意味着不向系统响应
长按键 是如何发生的呢
event.startTracking();//计数
return true//拦截事件
home键是一个敏感键,是交给系统层处理的,应用层是不可以处理的,
二.触摸事件处理,事件传递模型
触摸事件的类型
:down
:up
:move
:pointer_down 多指事件
public class MainActivity extends Activity implements OnTouchListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv = (TextView) findViewById(R.id.tv);
tv.setOnTouchListener(this);
LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
MyTouchEvent event = new MyTouchEvent();
ll.setOnTouchListener(event);
}
private class MyTouchEvent implements OnTouchListener{
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.i("tz","layout down");
break;
case MotionEvent.ACTION_MOVE:
Log.i("tz","layout move");
break;
case MotionEvent.ACTION_UP:
Log.i("tz","layout up");
break;
}
return true;
}
}
/**
* 触摸事件：down move up pointer_down多指
*/
@Override
public boolean onTouch(View v, MotionEvent event) {
int count = event.getPointerCount(); //获得触摸手指的数量
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.i("tz","down");
//拿到按下的坐标
float x = event.getX();
float y = event.getY();
x = event.getRawX();//以屏幕为坐标系 包括了标题栏和状态栏的坐标
y = event.getRawY();
Log.i("tz", "RawX:"+x);
Log.i("tz","RawY:"+y);
break;
case MotionEvent.ACTION_POINTER_DOWN://多跟手指按下
Log.i("tz","pointer_down");
//获取第2根手指的坐标？？获取第3根手指的坐标？？
x = event.getX(count-1);//下标从0开始
y = event.getY(count-1);
break;
case MotionEvent.ACTION_MOVE:
Log.i("tz","move");
x = event.getX();//以我们点击的view为坐标
y = event.getY();
x = event.getRawX();//以屏幕为坐标系
y = event.getRawY();
//其他手指移动的坐标
x = event.getX(count-1);
y = event.getY(count-1);
Log.i("tz", "move RawX:"+x);
Log.i("tz","move RawX:"+y);
break;
case MotionEvent.ACTION_UP:
Log.i("tz","up");
break;
}
return true;//表示将事件拦截(消费)
//return false;//表示事件交由上级容器处理 move up 就捕获不到了
//return super.onTouchEvent(event);//把事件交给Activity处理 由Activity类决定是return true 还是false;
}
}
如果在down的时候,农民没有完成任务,以后市长秘书就不会叫农民处理move和up事件了
http://blog.csdn.net/chenqiang920502/article/details/50378837