android 事件

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
/**
*
* 控件事件通过设置其控件的监听器来监听并处理事件
* 按键按下事件：通过重写onKeyDown方法
* 按键弹起事件：通过重写onKeyUp方法
* 触笔点击事件：通过实现onTouchEvent方法
* 示例中使用了Toast控件：
* Toast.makeText(this, string, Toast.LENGTH_SHORT).show();
* 显示提示信息
*
*/

public class Activity01 extends Activity
{

public void onCreate(Bundle savedInstanceState)
{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);
//获得Button对象
Button button_ok = (Button) findViewById(R.id.ok);
//设置Button控件监听器
button_ok.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v)
{
//这里处理事件
DisplayToast("点击了OK按钮");
}
});

}

/* 按键按下所触发的事件 */
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_DPAD_CENTER:
DisplayToast("按下：中键");
break;
case KeyEvent.KEYCODE_DPAD_UP:
DisplayToast("按下：上方向键");
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
DisplayToast("按下：下方向键");
break;
case KeyEvent.KEYCODE_DPAD_LEFT:
DisplayToast("按下：左方向键");
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
DisplayToast("按下：右方向键");
break;
}
return super.onKeyDown(keyCode, event);
}
/* 按键弹起所触发的事件 */
public boolean onKeyUp(int keyCode, KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_DPAD_CENTER:
DisplayToast("弹起：中键");
break;
case KeyEvent.KEYCODE_DPAD_UP:
DisplayToast("弹起：上方向键");
break;
case KeyEvent.KEYCODE_DPAD_DOWN:
DisplayToast("弹起：下方向键");
break;
case KeyEvent.KEYCODE_DPAD_LEFT:
DisplayToast("弹起：左方向键");
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
DisplayToast("弹起：右方向键");
break;
}

return super.onKeyUp(keyCode, event);
}

public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
{

return super.onKeyMultiple(keyCode, repeatCount, event);
}

/* 触笔事件 */
public boolean onTouchEvent(MotionEvent event)
{
int iAction = event.getAction();
if (iAction == MotionEvent.ACTION_CANCEL ||
iAction == MotionEvent.ACTION_DOWN ||
iAction == MotionEvent.ACTION_MOVE)
{
return false;
}
//得到触笔点击的位置
int x = (int) event.getX();
int y = (int) event.getY();

DisplayToast("触笔点击坐标：("+Integer.toString(x)+","+Integer.toString(y)+")");

return super.onTouchEvent(event);
}

/* 显示Toast */
public void DisplayToast(String str)
{
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
}

更多相关文章

随机推荐