本文实例为大家分享了Android实现秒表功能的具体代码，供大家参考，具体内容如下
设计完成一个秒表，具备启停功能，正确使用工作线程完成界面刷新
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="秒表"
android:textSize="30sp" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/_00_00_00"
android:textSize="30sp"
android:id="@+id/clock" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="清零"
android:id="@+id/init" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="计时"
android:id="@+id/start" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="停止"
android:id="@+id/stop" />
</LinearLayout>
</LinearLayout>
AndroidManifest.xml
将activity,service在AndoidMainfest.xml中注册
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ex_5">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainAActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".TimeService">
</service>
</application>
</manifest>
Timeservice.java
service服务
package com.example.ex_5;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import androidx.annotation.Nullable;
import java.util.Date;
public class TimeService extends Service {
@Nullable
private Date startTime = new Date();
private long diff;
public Thread workThread;
private Runnable backGroundWork = new Runnable() {
@Override
public void run() {
while(!Thread.interrupted()){
Date endTime = new Date();
diff = endTime.getTime()-startTime.getTime();
MainActivity.UpdateGUI(diff);
Log.i("TimeService:The diff is",String.valueOf(diff));
try {
Thread.sleep(0);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
@Override
public void onCreate() {
super.onCreate();
Log.i("TimeService","onCreate");
workThread=new Thread(null,backGroundWork,"workThread");
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
if(!workThread.isAlive()){
workThread.start();
}
Log.i("TimeService","onStart");
}
@Override
public void onDestroy() {
super.onDestroy();
MainActivity.UpdateGUI(0);
MainActivity.UpdateDiff(diff);
workThread.interrupt();
Log.i("TimeService","onDestroy");
}
public IBinder onBind(Intent intent) {
return null;
}
}
MainActivity.java
注册按钮响应事件，更新UI界面
package com.example.ex_5;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import java.net.ServerSocket;
public class MainActivity extends AppCompatActivity {
private static Handler handler = new Handler();
private static TextView labelView = null;
private static String time;
private static long _diff = 0;
//更新界面
public static void UpdateGUI(long diff) {
diff += _diff;
int hours = (int) diff / (1000 * 60 * 60);
int minutes = (int) (diff - (hours * (1000 * 60 * 60))) / (1000 * 60);
int seconds = (int) (diff - (hours * (1000 * 60 * 60)) - (minutes * (1000 * 60))) / 1000;
time = hours + ":" + minutes + ":" + seconds;
handler.post(RefreshLable);
}
//供停止功能使用，用于记录服务结束之时的时间
public static void UpdateDiff(long diff){
_diff = diff;
}
//setText
public static Runnable RefreshLable = new Runnable() {
@Override
public void run() {
labelView.setText(time);
}
};
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button initButton = findViewById(R.id.init);
final Button startButton = findViewById(R.id.start);
Button stopButton = findViewById(R.id.stop);
labelView = findViewById(R.id.clock);
final Intent serviceIntent = new Intent(this, TimeService.class);
startButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View view) {
Log.i("MainActivity","ClickStartButton");
startService(serviceIntent);
}
});
stopButton.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
Log.i("the behead diff is",String.valueOf(_diff));
Log.i("MainActivity","ClickStopButton");
stopService(serviceIntent);
}
});
initButton.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
Log.i("MainActivity","ClickInitButton");
_diff = 0;
String text = "00:00:00";
labelView.setText(text);
stopService(serviceIntent);
}
});
}
}
