来自 BroadcastReceiver 的 startActivity() [英] startActivity() from BroadcastReceiver

问题描述

我正在尝试使用在 onPause() 方法中实现的以下 BroadcastReceiver 在充电时自动启动我的 nightclock 应用程序:

I am trying to autostart my nightclock application on charging using the following BroadcastReceiver implemented in the onPause() method:

BroadcastReceiver test = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        unregisterReceiver(this);
        Intent i = new Intent(context, NightClock.class);
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);   
    }           
};
registerReceiver(test, new IntentFilter(Intent.ACTION_POWER_CONNECTED));

当插入 USB 电缆时触发 onReceive() 方法，但活动没有启动.但是日志显示:

The onReceive() method is fired when the USB-cable is plugged in, but the activity doesn't start. However the log shows this:

I/ActivityManager(   79): Starting activity: Intent { flg=0x10000000 cmp=com.meins.nightclock/.NightClock }

任何想法为什么日志说活动已开始，但没有任何反应?

Any ideas why the log says the activity is started, but nothing happens?

推荐答案

如果您的目标是在发送 ACTION_POWER_CONNECTED 广播时启动 NightClock，您的使用 BroadcastReceiver 的方法很好.但是，不要从活动中注册它.相反，在清单中注册它:

If your goal is that you want NightClock to be started whenever an ACTION_POWER_CONNECTED broadcast is sent, your approach of using a BroadcastReceiver is fine. However, do not register it from an activity. Rather, register it in the manifest:

<receiver android:name=".OnPowerReceiver">
        <intent-filter>
                <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
        </intent-filter>
</receiver>

然后，将您的 BroadcastReceiver 作为公共 Java 类(此处命名为 OnPowerReceiver，尽管您可以随意调用它)，并让它调用 startActivity().

Then, have your BroadcastReceiver as a public Java class (here named OnPowerReceiver, though you can call it whatever you want), and have it call startActivity().

请记住，用户可能不希望您这样做.除了启动夜间时钟"之外，还有许多其他情况可以将手机连接到电源.我谦虚地建议您让用户通过主屏幕开始您的活动.

Bear in mind that users probably do not want you doing this. There are many other cases for connecting a phone to power besides starting a "night clock". I humbly suggest you simply let users start your activity via the home screen.

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