Chronometer控件

Chronometer定时器控件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!--
        Chronometer - 计时器控件
    -->
    <Chronometer android:id="@+id/chronometer"
        android:layout_width="wrap_content" android:layout_height="wrap_content" />

    <Button android:id="@+id/btnStart" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="开始计时">
        <requestFocus />
    </Button>

    <Button android:id="@+id/btnStop" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="停止计时">
    </Button>

    <Button android:id="@+id/btnReset" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="计时器复位">
    </Button>

</LinearLayout>

package com.chronometer;

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 ChronometerActivity extends Activity {

    private Chronometer mChronometer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.main);

        setTitle("Chronometer");

        Button button;

        mChronometer = (Chronometer) findViewById(R.id.chronometer);
        // 设置计时器所显示的时间格式
        mChronometer.setFormat("计时：(%s)");
        
        button = (Button) findViewById(R.id.btnStart);
        button.setOnClickListener(mStartListener);

        button = (Button) findViewById(R.id.btnStop);
        button.setOnClickListener(mStopListener);

        button = (Button) findViewById(R.id.btnReset);
        button.setOnClickListener(mResetListener);
    }

    View.OnClickListener mStartListener = new OnClickListener() {
        public void onClick(View v) {
            // 启动计时器
            mChronometer.start();
        }
    };

    View.OnClickListener mStopListener = new OnClickListener() {
        public void onClick(View v) {
            // 暂停计时器
            mChronometer.stop();
        }
    };

    View.OnClickListener mResetListener = new OnClickListener() {
        public void onClick(View v) {
            // 复位计时器，即停止计时器
            mChronometer.setBase(SystemClock.elapsedRealtime());
        }
    };
}