android 计时器 Chronometer
计时器组件是TextView的子类，其主要功能还是显示文本操作。
在main.xml中
<?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="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:gravity="center_horizontal"/>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_marginTop="8dp"
android:gravity="center_horizontal">
<Button
android:id="@+id/butStart"
android:text="开始计时"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/butStop"
android:text="停止计时"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/butBase"
android:text="复位"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/butFormat"
android:text="格式化"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
在MyChronometerDemo.java程序中
package com.tarena.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 MyChronometerDemo extends Activity {
private Chronometer myChronometer = null;
private Button butStart = null;
private Button butStop = null;
private Button butBase = null;
private Button butFormat = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.myChronometer = (Chronometer) super.findViewById(R.id.myChronometer);
this.butStart = (Button) super.findViewById(R.id.butStart);
this.butStop = (Button) super.findViewById(R.id.butStop);
this.butBase = (Button) super.findViewById(R.id.butBase);
this.butFormat = (Button) super.findViewById(R.id.butFormat);
this.butStart.setOnClickListener(new OnClickListenerImplStart());
this.butStop.setOnClickListener(new OnClickListenerImplStop());
this.butBase.setOnClickListener(new OnClickListenerImplBase());
this.butFormat.setOnClickListener(new OnClickListenerImplFormat());
}
private class OnClickListenerImplStart implements OnClickListener{
public void onClick(View v){
MyChronometerDemo.this.myChronometer.start(); //开始计时
}
}
private class OnClickListenerImplStop implements OnClickListener{
public void onClick(View v){
MyChronometerDemo.this.myChronometer.stop(); //停止计时
}
}
private class OnClickListenerImplBase implements OnClickListener{
public void onClick(View v){
MyChronometerDemo.this.myChronometer.setBase(SystemClock
.elapsedRealtime()); //复位时间
}
}
private class OnClickListenerImplFormat implements OnClickListener{
public void onClick(View v){
MyChronometerDemo.this.myChronometer.setFormat("新的显示格式:%s"); //格式化时间
}
}
}