Question

我制作的应用程序可以读取传入的短信然后检索文本短信，以便在我的活动中将其写在edittext上。我的应用程序就像使用短信验证代码时的Whatsapp。当保存验证文本代码的活动仍在运行时，应用程序正常运行，但是当活动未运行（活动完成）时，应用程序在传入短信时崩溃。请帮助我，我一直有这个问题已经很久没有解决了。非常感谢你的帮助。我收到这样的错误消息，

java.lang.RuntimeException: Unable to start receiver com.rental.roby.okkarent.aplikasi.helper.SmsReceiver: java.lang.NullPointerException

at android.app.ActivityThread.handleReceiver(ActivityThread.java:2590)
at android.app.ActivityThread.access$1700(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342) 
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5421)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:979)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795)
at dalvik.system.NativeStart.main(Native Method)

Caused by: java.lang.NullPointerException
at com.rental.roby.okkarent.aplikasi.helper.SmsReceiver.onReceive(SmsReceiver.java:40)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2571)
at android.app.ActivityThread.access$1700(ActivityThread.java:151) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1342) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:136) 
at android.app.ActivityThread.main(ActivityThread.java:5421) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:515) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:979)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795) 
at dalvik.system.NativeStart.main(Native Method)

这是我的广播接收器代码，

public class SmsReceiver extends BroadcastReceiver {

    private static SmsListener mListener;

    @Override
    public void onReceive(Context context, Intent intent) {
        Bundle data  = intent.getExtras();

        Object[] pdus = (Object[]) data.get("pdus");

        for(int i=0;i<pdus.length;i++){
            SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) pdus[i]);

            String sender = smsMessage.getDisplayOriginatingAddress();
            //You must check here if the sender is your provider and not another one with same text.

            String messageBody = smsMessage.getMessageBody();
            String verificationCode = getVerificationCode(messageBody);

            //Pass on the text to our listener.
            Log.d("","--------------------------------------------------------"+context);
            if(verificationCode != null){
                   // Toast.makeText(context, verificationCode, Toast.LENGTH_LONG).show();
                    mListener.messageReceived(verificationCode);
            }
        }

    }


    public static void bindListener(SmsListener listener) {
        mListener = listener;
    }
    private String getVerificationCode(String message) {
        String code = null;
        int index = message.indexOf(":");


        if (index != -1) {
            int start = index + 2;
            int length = 4;
            code = message.substring(start, start + length);
            return code;
        }

        return code;
    }
}

这是界面，

public interface SmsListener {

        public void messageReceived(String messageText);

}

最后在我的活动中，我添加了这样的代码来自动编写代码验证，

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fom_verifikasi);


        // asking for sms code verification, 
        get_verification_code(no_hp);  

        // catch incoming sms
        SmsReceiver.bindListener(new SmsListener() {
            @Override
            public void messageReceived(String messageText) {
                //Log.d("Text",messageText);
                // write verficaation code to edittext
                kode.setText(messageText);
            }
        });



    }

这是清单，

<receiver android:name="com.rental.roby.okkarent.aplikasi.helper.SmsReceiver">
            <intent-filter>
                <action android:name="android.provider.Telephony.SMS_RECEIVED" />
            </intent-filter>
        </receiver>

Answer 1

有时候SMS的包是空的，所以在处理之前检查一下，就像这个

一样

public void onReceive(Context context, Intent intent) {

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

    try {

        if (bundle != null) {

            final Object[] pdusObj = (Object[]) bundle.get("pdus");

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

                SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                String phoneNumber = currentMessage.getDisplayOriginatingAddress();
                String message = currentMessage.getDisplayMessageBody();

                // 
            }
        }

    } catch (Exception e) {

    }
}

使用广播接收器Android Studio接收短信时应用程序崩溃

1 个答案: