Android 安卓-关机前发送短信

我正试图写一个应用程序，将发送手机短信关机的意图

我想这样，手机将关闭后，只有短信发送。如果发送失败，应用程序应重试发送

我发现了错误

java.lang.RuntimeException: Error receiving broadcast Intent {act=android.intent.action.ACTION_SHUTDOWN flg=0x10} in com.novytes.TestSOS.ShutdownReceiver@417008b0

        at com.novytes.TestSOS.SmsHandler.sendSMS (SmsHandler.java:33)
        at com.novytes.TestSOS.ShutdownReceiver$1.run (ShutdownReceiver.java:25)
        at com.novytes.TestSOS.ShutdownReceiver.onReceive (ShutdownReceiver.java:22)

我有以下文件

MyActivity-主活动，仅启动主服务

MainService-注册广播接收器的服务

ShutdownReceiver-尝试使用其他类发送SMS的BroadcastReceiver

SMSHandler-用于发送SMS的类

MainService.java

    static final String TAG = "SOS_APP";
    IntentFilter filter;
    BroadcastReceiver mReceiver;

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "Service created");
        filter = new IntentFilter(Intent.ACTION_SHUTDOWN);
        mReceiver = new ShutdownReceiver();
        registerReceiver(mReceiver, filter);
    }

ShutdownReceiver.java

    SmsHandler smsHandler;
    private boolean sent=false;

    @Override
    public void onReceive(Context context, Intent intent) {
        smsHandler = new SmsHandler();
        if (intent.getAction().equals(Intent.ACTION_SHUTDOWN))
        {
            new Thread(){
                public void run(){
                    if(sent!=true){
                        smsHandler.sendSMS(ShutdownReceiver.this);
                    }else{
                        return;
                    }
                    try {
                        Log.v("SOS_APP","delaying shutdown");
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }.run();
        }
        if(intent.getAction().equals(Activity.RESULT_OK)){
            sent = true;
        }

    }

SMSHandler.java

public void sendSMS(ShutdownReceiver mReceiver)
{
    String SENT = "SMS_SENT";
    PendingIntent sentPI = PendingIntent.getBroadcast(getApplicationContext(), 0, new Intent(SENT),   0);
    registerReceiver(mReceiver , new IntentFilter(SENT));
    smsManager = SmsManager.getDefault();
    smsManager.sendTextMessage(phoneNumber, null, "Message", sentPI, null);
}

最后，这是我的android清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.novytes.TestSOS"
          android:versionCode="1"
          android:versionName="1.0">
    <uses-sdk android:minSdkVersion="16"/>
    <uses-permission android:name="android.permission.ACTION_SHUTDOWN"></uses-permission>
    <uses-permission android:name="android.permission.SEND_SMS"></uses-permission>

    <application android:label="@string/app_name" android:icon="@drawable/ic_launcher">
        <activity android:name="MyActivity"
                  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=".MainService">

        </service>

        <receiver android:name=".ShutdownReceiver"
                  android:permission="android.permission.ACTION_SHUTDOWN" >
            <intent-filter>
                <action android:name="android.permission.ACTION_SHUTDOWN" />
                <action android:name="android.intent.action.QUICKBOOT_POWEROFF" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>

    </application>
</manifest>

添加此权限：

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

---

一些开发人员说它是必需的

我认为您在

SMSHandler.java

中获得了

getApplicationContext（）

null

您必须在

SMSHandler.java

中创建

Constructor

，并在参数中传递

Context

比如：

---

希望对您有所帮助。

您有什么问题？放置logcat错误。@PratikButani抱歉，我正在编辑，无意中点击了提交。更新了问题。感谢这意味着onReceive方法中存在未捕获的异常。看看是什么引起的。。。没有代码和更详细的堆栈跟踪，很难说。@PratikButani这里是整个堆栈跟踪，但这并不能回答这个问题。若要评论或要求作者澄清，请在其帖子下方留下评论-你可以随时对自己的帖子发表评论，一旦你有足够的评论，你就可以发表评论。这个答案应该有助于消除提问者的错误，让意图发挥作用。所以这实际上提供了答案。让开发者评论一下答案是否正确。我试过了，我可以发送短信，但应用程序从未收到发送的短信。它确实发送短信，但我无法检查它是否确实已发送

public class SMSHandler {

    Context context;

    public SMSHandler(Context context) {
    this.context = context;        
    }

    public void sendSMS(ShutdownReceiver mReceiver)
    {
        String SENT = "SMS_SENT";
        
        /**** Change THIS LINE with passing Context variable *****/
        PendingIntent sentPI = PendingIntent.getBroadcast(context, 0, new Intent(SENT),   0);
        
        registerReceiver(mReceiver , new IntentFilter(SENT));
        smsManager = SmsManager.getDefault();
        smsManager.sendTextMessage(phoneNumber, null, "Message", sentPI, null);
    }
}