Android怎么让一个service开机自动启动

1.首先开机启动后系统会发出一个Standard Broadcast Action，名字叫android.intent.action.BOOT_COMPLETED，这个Action只会发出一次。

2.构造一个IntentReceiver类，重构其抽象方法onReceiveIntent(Context context, Intent intent)，在其中启动你想要启动的Service。

3.在AndroidManifest.xml中，首先加入<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>来获得BOOT_COMPLETED的使用许可，然后注册前面重构的IntentReceiver类，在其<intent-filter>中加入<action android:name="android.intent.action.BOOT_COMPLETED" /> ，以使其能捕捉到这个Action。

一个例子
xml：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
<receiver android:name=".OlympicsReceiver" android:label="@string/app_name">
    <intent-filter>
       <action android:name="android.intent.action.BOOT_COMPLETED" />
       <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</receiver>

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
<receiver android:name=".OlympicsReceiver" android:label="@string/app_name">
    <intent-filter>
       <action android:name="android.intent.action.BOOT_COMPLETED" />
       <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</receiver>

 java：

public class OlympicsReceiver extends IntentReceiver
{
    /*要接收的intent源*/
    static final String ACTION = "android.intent.action.BOOT_COMPLETED";

    public void onReceiveIntent(Context context, Intent intent)
    {
        if (intent.getAction().equals(ACTION))
        {
                  context.startService(new Intent(context,
                       OlympicsService.class), null);//启动倒计时服务
             Toast.makeText(context, "OlympicsReminder service has started!", Toast.LENGTH_LONG).show();
        }
    }
}

public class OlympicsReceiver extends IntentReceiver
{
    /*要接收的intent源*/
    static final String ACTION = "android.intent.action.BOOT_COMPLETED";

    public void onReceiveIntent(Context context, Intent intent)
    {
        if (intent.getAction().equals(ACTION))
        {
                  context.startService(new Intent(context,
                       OlympicsService.class), null);//启动倒计时服务
             Toast.makeText(context, "OlympicsReminder service has started!", Toast.LENGTH_LONG).show();
        }
    }
}

 注意：现在的IntentReceiver已经变为BroadcastReceiver，OnReceiveIntent为onReceive。所以java这边的代码为：

（也可以实现应用程序开机自动启动）

public class OlympicsReceiver extends BroadcastReceiver
{
    /*要接收的intent源*/
    static final String ACTION = "android.intent.action.BOOT_COMPLETED";

    public void onReceive(Context context, Intent intent)
    {
        if (intent.getAction().equals(ACTION))
        {
                  context.startService(new Intent(context,
                       OlympicsService.class), null);//启动倒计时服务
             Toast.makeText(context, "OlympicsReminder service has started!", Toast.LENGTH_LONG).show();
            //这边可以添加开机自动启动的应用程序代码
        }
    }
}