java - 在重启时加速 BroadcastReceiver 的启动

Question

我有一个应用程序，用户可以在其中调用自定义锁定屏幕来锁定他/她的手机，这是一个名为 LockScreen.class 的 Activity 。 一旦加载此屏幕，即设备被锁定，一个名为 IsLocked 的 SharedPreferences 被指定为 true。 一旦用户使用锁定屏幕执行他需要的操作，此 islocked 变为错误，手机恢复正常。

每个 hing 都按预期正常工作。

问题是，如果由于某种原因手机在 lock 屏幕处于 Activity 状态时重新启动，则它不会在重新启动时重新运行。

所以，我创建了一个 BootReciever，如下所示，它工作正常，但是在完成重启过程后，用户可以在加载之前做很多事情，我的问题是 如何我让它加载得更快？ 以便在让用户有机会使用手机执行任何操作之前，手机屏幕再次被自定义 Activity 锁定？

public class BootReciever extends BroadcastReceiver
{

    SharedPreferences mPrefs;
    final String IsLockedPref = "IsLocked";

    @Override
    public void onReceive(Context context, Intent intent) {

        mPrefs = PreferenceManager.getDefaultSharedPreferences(context);
        Boolean islocked = mPrefs.getBoolean(IsLockedPref, false);

        Intent i;
        if (islocked)
            i = new Intent(context, LockScreen.class);
        else
            i = new Intent(context, MainActivity.class);

        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    }
}

list 文件的一部分是:

<receiver android:name=".BootReciever"
          android:enabled="true"
          android:exported="true">
     <intent-filter >
            <action android:name="android.intent.action.BOOT_COMPLETED"/>
            <action android:name="android.intent.action.QUICKBOOT_POWERON" />
     </intent-filter>
</receiver>

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

更新

我试图使用 this通过添加以下内容授予 Device Admin，但没有任何改进:

在主 Activity 中:

    private static final int ADMIN_INTENT = 15;
    private static final String description = "Some Description About Your Admin";
    private DevicePolicyManager mDevicePolicyManager;
    private ComponentName mComponentName;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

       mDevicePolicyManager = (DevicePolicyManager)getSystemService(
                this.DEVICE_POLICY_SERVICE);
        mComponentName = new ComponentName(this, AdminReceiver.class);
        Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mComponentName);
        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION,description);
        startActivityForResult(intent, ADMIN_INTENT);
.
.
}

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == ADMIN_INTENT) {
            if (resultCode == RESULT_OK) {
                Toast.makeText(getApplicationContext(), "Registered As Admin", Toast.LENGTH_SHORT).show();
            }else{
                Toast.makeText(getApplicationContext(), "Failed to register as Admin", Toast.LENGTH_SHORT).show();
            }
        }
    }

并创建了空接收器以将 DeviceAdminReceiver 扩展为:

public class AdminReceiver extends DeviceAdminReceiver {

}

并将以下内容添加到 list 中:

<receiver
    android:name="AdminReceiver"
    android:permission="android.permission.BIND_DEVICE_ADMIN">
    <meta-data
        android:name="android.app.device_admin"
        android:resource="@xml/admin"/>

    <intent-filter>
        <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
    </intent-filter>
</receiver>

Answer 1

您可以做的一件事是为您的 intent-filter 设置优先级。来自 documentation

It controls the order in which broadcast receivers are executed to receive broadcast messages. Those with higher priority values are called before those with lower values.

<intent-filter 
    android:priority="100">
        ...
</intent-filter>

The value must be an integer, such as "100". Higher numbers have a higher priority. The default value is 0. The value must be greater than -1000 and less than 1000.