Chronometer 计时器的使用

import android.widget.Chronometer;

sdk中的源码：

实现了开始计数，重置，暂停，格式化字符串

/* * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.android.apis.view; // Need the following import to get access to the app resources, since this // class is in a sub-package. import com.example.android.apis.R; import android.app.Activity; import android.os.Bundle; import android.os.SystemClock; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Chronometer; public class ChronometerDemo extends Activity { Chronometer mChronometer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.chronometer); Button button; mChronometer = (Chronometer) findViewById(R.id.chronometer); // Watch for button clicks. button = (Button) findViewById(R.id.start); button.setOnClickListener(mStartListener); button = (Button) findViewById(R.id.stop); button.setOnClickListener(mStopListener); button = (Button) findViewById(R.id.reset); button.setOnClickListener(mResetListener); button = (Button) findViewById(R.id.set_format); button.setOnClickListener(mSetFormatListener); button = (Button) findViewById(R.id.clear_format); button.setOnClickListener(mClearFormatListener); } View.OnClickListener mStartListener = new OnClickListener() { public void onClick(View v) { mChronometer.start(); } }; View.OnClickListener mStopListener = new OnClickListener() { public void onClick(View v) { mChronometer.stop(); } }; View.OnClickListener mResetListener = new OnClickListener() { public void onClick(View v) { mChronometer.setBase(SystemClock.elapsedRealtime()); } }; View.OnClickListener mSetFormatListener = new OnClickListener() { public void onClick(View v) { mChronometer.setFormat("Formatted time (%s)"); } }; View.OnClickListener mClearFormatListener = new OnClickListener() { public void onClick(View v) { mChronometer.setFormat(null); } }; }