在ImageView的OnTouchListener实现onLongClick功能

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下面就在ontouch中对ImageView自定义长按事件进行了重新仅供大家参考 布局xml文件就一个imageview这里我就不贴了：

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import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

private ImageView imageview;

private String tag ="MainActivity";

private int mLastMotionX, mLastMotionY;

private int mCounter;
//长按的runnable
private Runnable mLongPressRunnable;
//移动的阈值
private static final int TOUCH_SLOP = 20;

MyHandler myHandler;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

imageview = (ImageView) findViewById(R.id.imageView1);
myHandler = new MyHandler();

mLongPressRunnable = new Runnable() {

@Override
public void run() {
Log.i(tag, "run-ok--");
Message msg = new Message();
msg.what =2000;
myHandler.sendMessage(msg);
}
};

imageview.setOnTouchListener(new OnTouchListener() {

public boolean onTouch(View arg0, MotionEvent event) {

int x = (int) event.getX();
int y = (int) event.getY();

switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
mCounter=2;
Log.i(tag, "ACTION_DOWN---"+mCounter);
mLastMotionX = x;
mLastMotionY = y;

myHandler.postDelayed(mLongPressRunnable,2000);

break;
case MotionEvent.ACTION_MOVE:
Log.i(tag, "ACTION_MOVE---"+mCounter);
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
myHandler.removeCallbacks(mLongPressRunnable);
}
break;
case MotionEvent.ACTION_UP:
Log.i(tag, "ACTION_UP---"+mCounter);
myHandler.removeCallbacks(mLongPressRunnable);
break;
}
return true;

}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

/**
* 接受消息,处理消息 ,此Handler会与当前主线程一块运行
* */

class MyHandler extends Handler {
public MyHandler() {
}

public MyHandler(Looper L) {
super(L);
}

// 子类必须重写此方法,接受数据
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
Log.d("MyHandler", "handleMessage......");
super.handleMessage(msg);
// 此处可以更新UI
if(msg.what ==2000)
{
Toast.makeText(MainActivity.this, "Hello World!", Toast.LENGTH_SHORT).show();
}

}
}

}