显示用户触摸持续的时间

MainActivity.java

package com.xwy.shi;

import android.support.v4.app.Fragment;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends Activity implements OnTouchListener{

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		LinearLayout layout = new LinearLayout(this);//定义线性布局
		layout.setOnTouchListener(this);//设置触屏事件监听器
		layout.setBackgroundResource(R.drawable.background);
		setContentView(layout);//使用布局
	}

	
	public boolean onTouch(View v, MotionEvent event) {
		long time = event.getEventTime() - event.getDownTime();// 计算触摸事件持续时间
		if(event.getActionMasked() == MotionEvent.ACTION_UP)
			Toast.makeText(this, "触摸事件持续时间："+time+"ms", Toast.LENGTH_LONG).show();
		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;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	/**
	 * A placeholder fragment containing a simple view.
	 */
	public static class PlaceholderFragment extends Fragment {

		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View rootView = inflater.inflate(R.layout.fragment_main, container,
					false);
			return rootView;
		}
	}

	

}