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