如何在收到短信时使用广播接收器吐司？

Question

这是MainActivity.java：

package tagit.aj.com.broadcastreceiverforsms; 

import android.content.Intent; 
import android.content.IntentFilter; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 
} 

此所述MyReceiver类，其包括广播接收器的方法onReceive。这里使用的一种方法是“不推荐”，但我认为它不会在测试中产生任何问题。

package tagit.aj.com.broadcastreceiverforsms; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.telephony.SmsMessage; 
import android.util.Log; 
import android.widget.Toast; 

public class MyReceiver extends BroadcastReceiver { 

    public void onReceive(Context context, Intent intent) { 

     Toast.makeText(context,"IncomingSms",Toast.LENGTH_SHORT).show(); 

     // Retrieves a map of extended data from the intent. 
     final Bundle bundle = intent.getExtras(); 

     try { 
      if (bundle != null) { 
       Object[] pdus = (Object[]) bundle.get("pdus"); 

       for (int i = 0; i < pdus.length; i++) { 

        SmsMessage messages = SmsMessage.createFromPdu((byte[]) pdus[i]); 

        String phoneNumber = messages.getDisplayOriginatingAddress(); 
        String phone = phoneNumber; 
        String stringMessage = messages.getDisplayMessageBody(); 

        int duration = Toast.LENGTH_LONG; 
        Log.i("Broadcasting", "Number" + phone + "Message" + stringMessage); 
        Toast toast = Toast.makeText(context, "senderNum: " + phone + ", message: " + stringMessage, duration); 
        toast.show(); 

       } // end for loop 
      } // bundle is null 
     } catch (Exception e) { 
      Log.e("SmsReceiver", "Exception smsReceiver" + e); 
     } 
    } 
} 

的XML布局：

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:id="@+id/activity_main" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:paddingBottom="@dimen/activity_vertical_margin" 
     android:paddingLeft="@dimen/activity_horizontal_margin" 
     android:paddingRight="@dimen/activity_horizontal_margin" 
     android:paddingTop="@dimen/activity_vertical_margin" 
     tools:context="tagit.aj.com.broadcastreceiverforsms.MainActivity"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="Hello World!" /> 
    </RelativeLayout> 

而且AndroidManifest文件是：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="tagit.aj.com.broadcastreceiverforsms"> 
    <uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission> 
    <uses-permission android:name="android.permission.READ_SMS"></uses-permission> 
    <uses-permission android:name="android.permission.SEND_SMS"></uses-permission> 
    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

     <receiver 
      android:name=".MyReceiver" 
      android:enabled="true" 
      android:exported="true"> 
      <intent-filter> 
       <action android:name="android.provider.Telephony.SMS_RECEIVED"></action> 
      </intent-filter> 
     </receiver> 
    </application> 

</manifest> 

请为我提供为什么发生此问题，并且解决方案（如果有的话）。我在Android KitKat上运行这个应用程序。

Answer 1

我觉得他的问题是，他的代码无法正常工作，由于SMS提供在Android 4.4系统

SMS Provider in Android 4.4