【Android】Chronometer组件实现计时器小程序

main.xml代码如下：

?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <Chronometer
        android:id="@+id/myChronometer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
 
    <LinearLayout
        android:orientation="horizontal"
        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" />
        <Button
            android:id="@+id/btnStop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="停止计时" />
        <Button
            android:id="@+id/btnBase"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="复位" />
        <Button
            android:id="@+id/btnFormat"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="格式化显示" />
    </LinearLayout>
 
</LinearLayout>

java代码如下：

package org.lxh.demo;
 
import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.Chronometer;
import android.widget.EditText;
import android.widget.TextView;
 
public class Hello extends Activity {
	private Chronometer myChronometer=null;
	private Button btnStart=null;
	private Button btnStop=null;
	private Button btnBase=null;
	private Button btnFormat=null;
 
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState); // 生命周期方法
		super.setContentView(R.layout.main); // 设置要使用的布局管理器
		this.myChronometer=(Chronometer)super.findViewById(R.id.myChronometer);
		this.btnStart=(Button)super.findViewById(R.id.btnStart);
		this.btnStop=(Button)super.findViewById(R.id.btnStop);
		this.btnBase=(Button)super.findViewById(R.id.btnBase);
		this.btnFormat=(Button)super.findViewById(R.id.btnFormat);
		this.btnStart.setOnClickListener(new OnClickListenerStart());
		this.btnStop.setOnClickListener(new OnClickListenerStop());
		this.btnBase.setOnClickListener(new OnClickListenerBase());
		this.btnFormat.setOnClickListener(new OnClickListenerFormat());
	}
private class OnClickListenerStart implements OnClickListener{
 
	public void onClick(View arg0) {
		Hello.this.myChronometer.start();
		
	}
	
}
private class OnClickListenerStop implements OnClickListener{
 
	public void onClick(View arg0) {
		Hello.this.myChronometer.stop();
		
	}
	
}
private class OnClickListenerBase implements OnClickListener{
 
	public void onClick(View arg0) {
		Hello.this.myChronometer.setBase(SystemClock.elapsedRealtime());
		
	}
	
}
private class OnClickListenerFormat implements OnClickListener{
 
	public void onClick(View arg0) {
		Hello.this.myChronometer.setFormat("新的显示格式：%s。");
		
	}
	
}
	
}