android兑现简单定时关机应用程序
先看一下简单的图形界面吧，比较简单的实现定时关机！！！（我的上传资源中有整个工程）
当然我们是在eclipse下开发的，那么我们先建一个工程Shutdown（当然可以随便取），然后就是包名，类名什么的。。。这就不多说了，这里先看一下上面那个时钟的
代码：analogClock=(AnalogClock)findViewById(R.id.anolag_clock);
new Thread(){
public void run() {
try {
while(true)
{
Thread.sleep(1000);
tick++;
Message msg = Message.obtain();
msg.arg1 = tick;
handler.sendMessage(msg);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
}.start();
handler=new Handler(){
public void handleMessage(Message msg) {
Calendar calendar=Calendar.getInstance();
int h=calendar.getTime().getHours();
int m=calendar.getTime().getMinutes();
int hour=h, minute = m;
tick=msg.arg1;
minute+= tick/60;
tick =tick%60;
hour+= minute /60;
minute=minute%60;
String str =" NOW TIME "+ MessageFormat
.format("{0,number,0}:{1,number,00}", hour%24,minute);
text.setText(str);
super.handleMessage(msg);
}
};
显示当前的时钟。
save button响应事件
class button_saveListener implements OnClickListener
{
@Override
public void onClick(View v) {
SharedPreferences sharedPreferences=getSharedPreferences("time",Activity.MODE_PRIVATE);
SharedPreferences.Editor editor=sharedPreferences.edit();
if(edit_hour.getText().toString().equals("")||edit_minute.getText().toString().equals(""))
Toast.makeText(ShutdownActivity.this, "have no shutdown time", Toast.LENGTH_SHORT).show();
else
{
editor.putInt("hour",Integer.parseInt(edit_hour.getText().toString()));
editor.putInt("minute",Integer.parseInt(edit_minute.getText().toString()));
editor.commit();
Toast.makeText(ShutdownActivity.this, "save success", Toast.LENGTH_SHORT).show();
}
text_time.setText("SHUTDOWN TIME :"+Integer.parseInt(edit_hour.getText().toString())+":"+Integer.parseInt(edit_minute.getText().toString()));
Intent intent =new Intent();
intent.setClass(ShutdownActivity.this, ServiceActivity.class);//要建议个Service
startService(intent);
}
}
我们再来看看Service类：
public void onCreate() {
SharedPreferences myshaPreferences=getSharedPreferences("time",Activity.MODE_PRIVATE);
hour=myshaPreferences.getInt("hour", -1);
minute=myshaPreferences.getInt("minute", -1);
Thread thread=new Thread(){
public void run()
{
while(true)
{
Calendar calendar=Calendar.getInstance();
h=calendar.getTime().getHours();
m=calendar.getTime().getMinutes();
if(h==hour&&m==minute)
{
Intent newIntent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);//这里是会报错的，所以不能在eclipse下编译，要在源码下编译（下面会介绍）
newIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(newIntent);
break;
}
try {
Thread.sleep(1000);
} catch (Exception e)
{
e.printStackTrace();
}
}
}
};
thread.start();
super.onCreate();
}
在Manifast.xml文件中添加如下权限： <uses-permission android:name="android.permission.SHUTDOWN"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>"
还是贴出来吧：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="jxnu.shutdown"
android:versionCode="1"
android:versionName="1.0"
>
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.SHUTDOWN"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>"
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".ShutdownActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".ServiceActivity" android:label="@string/app_name" android:enabled="true"></service>
<receiver android:name=".ShutdownBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED">
</action>
</intent-filter>
</receiver>
</application>
建立一个 BroadcastReceiver来接收广播android.intent.action.BOOT_COMPLETED（每次开机就启动service）
public class ShutdownBroadcastReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){
Intent newIntent = new Intent(context,ServiceActivity.class);
context.startService(newIntent);
}
}
}
大概差不多了，但是要将你的工程放到源码的package/app中，另外还得建一个Android.mk文件，然后就是编译了，生成的Shutdown.apk会在out/.../system/app下，可以拿来安装。
具体在我上传的资源中有整个工程，想要学习的同学可以借鉴一下.