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<receiver android:name=".BootBroadcastReceiver">
  <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
   </intent-filter>
</receiver>

  
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>

public class BootBroadcastReceiver extends BroadcastReceiver {
    static final String ACTION = "android.intent.action.BOOT_COMPLETED";

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(ACTION)) {
            Intent mainActivityIntent = new Intent(context, MainActivity.class);  // 要启动的Activity
            mainActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(mainActivityIntent);
        }
    }
}