显示一个计时器开始计时,当计时器到达15s的时候,停止计时。此时页面多一个重置按钮,可再次进行计时。
页面布局
代码语言:javascript复制<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@ id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:background="@drawable/bg"
<Chronometer
android:id="@ id/chronometer"
android:layout_marginTop="8dp"
android:layout_marginLeft="5dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" /
<Button
android:id="@ id/restart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="重置"
android:visibility="gone" /
</LinearLayout
事件响应
代码语言:javascript复制package com.example.chronometerdemo;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;
import android.widget.Chronometer.OnChronometerTickListener;
public class MainActivity extends Activity
{
Chronometer time=null;
Button restart=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
time=(Chronometer) findViewById(R.id.chronometer);
restart=(Button) findViewById(R.id.restart);
//设置起始时间和时间格式,然后开始计时
time.setBase(SystemClock.elapsedRealtime());
time.setFormat("已用时间:%s");
time.start();
//给计时器添加监听器,当计时到达15s时,要重置
time.setOnChronometerTickListener(new OnChronometerTickListener() {
@Override
public void onChronometerTick(Chronometer arg0)
{
if(SystemClock.elapsedRealtime()-arg0.getBase() =15000)
{
arg0.stop();
restart.setVisibility(View.VISIBLE);
}
}
});
//给按钮添加重置的效果
restart.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0)
{
time.setBase(SystemClock.elapsedRealtime());
time.start();
restart.setVisibility(View.GONE);
}
});
}
@Override
public 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;
}
}
运行效果
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