事件处理

public class MainActivity_EventHandleing_3_1 extends Activity {

	public void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);
		// 获得Button对象
		Button button_ok = (Button) findViewById(R.id.button1);
		// 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();
	}

}