广播接收器在后台不起作用

huangapple
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英文:

Broadcast receiver not working in background

问题

我正在创建一个应用程序，该应用程序可以检测到安卓手机上的即将到来的短信，但是该应用程序在后台不起作用。

这是我的MainActivity.java文件，我在其中请求用户允许访问并读取短信的权限。

    package com.example.times;
    
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.core.app.ActivityCompat;
    import androidx.core.content.ContextCompat;
    
    import android.Manifest;
    import android.content.pm.PackageManager;
    import android.os.Bundle;
    import android.widget.Switch;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
    
        private static final int READ_SMS_PERMISSION = 0;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED) {
                if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.RECEIVE_SMS)) {
    //                do nothing
                } else {
                    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECEIVE_SMS}, READ_SMS_PERMISSION);
                }
            }
        }
    
        @Override
        public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
            switch (requestCode) {
                case READ_SMS_PERMISSION: {
                    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                        Toast.makeText(this, "Thank you for granting access", Toast.LENGTH_LONG).show();
                    } else {
                        Toast.makeText(this, "No problem", Toast.LENGTH_LONG).show();
                    }
                }
            }
        }
    }

这是MyReceiver.java文件，我在其中检测即将到来的短信并显示消息的Toast。

当应用程序打开时，它可以正常工作，但当我退出应用程序时，它无法检测到任何短信。

package com.example.times;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

    private static final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
    private static final String TAG = "SmsBroadcastReceiver";

    String msg, phoneNo = "";

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i(TAG, "Intent Received: " + intent.getAction());

        if (intent.getAction().equals(SMS_RECEIVED)) {
            Bundle dataBundle = intent.getExtras();
            if (dataBundle != null) {
                Object[] pdus = (Object[]) dataBundle.get("pdus");
                final SmsMessage[] messages = new SmsMessage[pdus.length];

                for (int i = 0; i < pdus.length; i++) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                        String format = dataBundle.getString("format");
                        messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i], format);
                    } else {
                        messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
                    }

                    msg = messages[i].getMessageBody();
                    phoneNo = messages[i].getOriginatingAddress();
                }
                Toast.makeText(context, "Message: " + msg + "\nNumber: " + phoneNo, Toast.LENGTH_SHORT).show();
            }
        }
    }
}


请告诉我是否存在任何错误。

<details>
<summary>英文:</summary>

I am creating a app which can detetct incomming sms to android phone but app is not working in background.

Here is my mainactivity.java in which i am asking for the permission from user to allow access to read sms.

    package com.example.times;
    
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.core.app.ActivityCompat;
    import androidx.core.content.ContextCompat;
    
    import android.Manifest;
    import android.content.pm.PackageManager;
    import android.os.Bundle;
    import android.widget.Switch;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
    
        private static final int READ_SMS_PERMISSION=0;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED)
            {
                if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.RECEIVE_SMS))
                {
    //                do nothing
                }
                else
                {
                    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECEIVE_SMS}, READ_SMS_PERMISSION);
                }
            }
        }
    
        @Override
        public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
        {
            switch(requestCode)
            {
                case READ_SMS_PERMISSION:
                {
                    if(grantResults.length&gt;0 &amp;&amp; grantResults[0]==PackageManager.PERMISSION_GRANTED)
                    {
                        Toast.makeText(this, &quot;Thankyou for granting access&quot;, Toast.LENGTH_LONG).show();
    
    
                    }
                    else
                    {
                        Toast.makeText(this, &quot;No problem&quot;, Toast.LENGTH_LONG).show();
                    }
                }
            }
        }
    }


Here is myreciver.java in which i am detecting incomming sms and making toast of that msg.

When app is opened then it is working properly but when i exit the app it is not detecting any sms.

    package com.example.times;
    
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.os.Build;
    import android.os.Bundle;
    import android.telephony.SmsMessage;
    import android.util.Log;
    import android.widget.Toast;
    
    public class MyReceiver extends BroadcastReceiver {
    
        private static final String SMS_RECEIVED=&quot;android.provider.Telephony.SMS_RECEIVED&quot;;
        private static final String TAG=&quot;SmsBroadcastReceiver&quot;;
    
        String msg, phoneNo =&quot;&quot;;
    
    
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO: This method is called when the BroadcastReceiver is receiving
            // an Intent broadcast.
    //        throw new UnsupportedOperationException(&quot;Not yet implemented&quot;);
    
            Log.i(TAG, &quot;Intent Received: &quot; +intent.getAction());
    
    
            if (intent.getAction()==SMS_RECEIVED)
            {
                Bundle dataBundle = intent.getExtras();
                if (dataBundle!=null)
                {
                    Object[] mypdu=(Object[])dataBundle.get(&quot;pdus&quot;);
                    final SmsMessage[] message = new SmsMessage[mypdu.length];
    
                    for (int i =0; i&lt;mypdu.length; i++)
                    {
                        if (Build.VERSION.SDK_INT&gt;=Build.VERSION_CODES.M)
                        {
                            String format= dataBundle.getString(&quot;format&quot;);
                            message[i] = SmsMessage.createFromPdu((byte[])mypdu[i],format);
    
                        }
                        else
                        {
                            message[i] = SmsMessage.createFromPdu((byte[]) mypdu[i]);
                        }
    
                        msg =message[i].getMessageBody();
                        phoneNo= message[i].getOriginatingAddress();
                    }
                    Toast.makeText(context, &quot;Message: &quot; +msg +&quot;\nNumber: &quot; +phoneNo, Toast.LENGTH_SHORT).show();
                }
            }
        }
    }


Telll me if i am doing something wrong.

</details>


# 答案1
**得分**: -1

请确保在您的 Android Mainfest.xml 文件中包含以下内容：

```xml
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />

还需要添加以下内容：

<receiver
    android:name="com.example.times.MyReceiver"
    android:enabled="true"
    android:exported="true">
</receiver>

编辑：
在您的应用关闭或在后台运行时，您需要一个 Intent Service 来读取短信。
Intent Service - 在后台运行

步骤：

  • 创建 Intent Service
  • 将其添加到清单文件中
  • 通过 Intent 在您的广播接收器的 onReceive() 方法中调用它
英文:

Make sure you have these in your Android Mainfest.xml

&lt;uses-permission android:name=&quot;android.permission.SEND_SMS&quot; /&gt;
&lt;uses-permission android:name=&quot;android.permission.RECEIVE_SMS&quot; /&gt;

And the following

&lt;receiver
    android:name=
        &quot;com.example.times.MyReceiver&quot;
    android:enabled=&quot;true&quot;
    android:exported=&quot;true&quot;&gt;
&lt;/receiver&gt;

EDIT <br>
You need an Intent Service to read sms while your app is closed or in background.<br>
Intent Service - Run in Background

Steps:

  • Create Intent Service
  • Add it Manifest
  • Call it from your Broadcast Receiver onReceive() method via Intent

huangapple
  • 本文由 发表于 2020年4月10日 16:30:05
  • 转载请务必保留本文链接：https://java.coder-hub.com/61136595.html
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