学步园

package com.example.longpress;

/** 
 * @author 作者 E-mail: chenshaohua2012@126.com
 * @version 创建时间：2013-1-15 下午12:07:32 
 * 类说明 
 */
import android.content.Context;
import android.view.MotionEvent;
import android.view.View;
public class LongPressView1 extends View {
	private int mLastMotionX, mLastMotionY;
	// 是否移动了
	private boolean isMoved;
	// 是否释放了
	private boolean isReleased;
	// 计数器，防止多次点击导致最后一次形成longpress的时间变短
	private int mCounter;
	// 长按的runnable
	private Runnable mLongPressRunnable;
	// 移动的阈值
	private static final int TOUCH_SLOP = 20;

	public LongPressView1(Context context) {
		super(context);
		mLongPressRunnable = new Runnable() {

			@Override
			public void run() {
				System.out.println("thread");
				System.out.println("mCounter--->>>"+mCounter);
				System.out.println("isReleased--->>>"+isReleased);
				System.out.println("isMoved--->>>"+isMoved);
				mCounter--;
				// 计数器大于0，说明当前执行的Runnable不是最后一次down产生的。
				if (mCounter > 0 || isReleased || isMoved)
					return;
				performLongClick();// 回调长按事件
			}
		};
	}

	public boolean dispatchTouchEvent(MotionEvent event) {
		int x = (int) event.getX();
		int y = (int) event.getY();

		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			mLastMotionX = x;
			mLastMotionY = y;
			mCounter++;
			isReleased = false;
			isMoved = false;
			postDelayed(mLongPressRunnable, 3000);// 按下 3秒后调用线程
			break;
		case MotionEvent.ACTION_MOVE:
			if (isMoved)
				break;
			if (Math.abs(mLastMotionX - x) > TOUCH_SLOP
					|| Math.abs(mLastMotionY - y) > TOUCH_SLOP) {
				// 移动超过阈值，则表示移动了
				isMoved = true;
			}
			break;
		case MotionEvent.ACTION_UP:
			// 释放了
			isReleased = true;
			break;
		}
		return true;
	}
}

public class LongMainActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		LinearLayout.LayoutParams layout = new LayoutParams(
				LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
		View v = new LongPressView1(LongMainActivity.this);
		v.setLayoutParams(layout);
		setContentView(v);
		v.setOnLongClickListener(new View.OnLongClickListener() {

			@Override
			public boolean onLongClick(View v) {
				Toast.makeText(LongMainActivity.this, "abcdef",
						Toast.LENGTH_SHORT).show();
				return false;
			}
		});
	}

}