在辅助活动上使用广播后Android崩溃

Question

我的应用程序有一个日志活动，用户输入手机号码。他可以使用按钮（“ENVIAR”）向该号码发送代码“1234020”，并使用内容和传入消息的号码更改TextView。

使用“SIGUIENTE”按钮，应用程序必须转到第二个活动LucesAlarma。在那里，他们用第一个活动的电话号码修改TextView并发送（使用“ENVIARLA”按钮）并接收消息。

“Atras”按钮应返回第一个活动。问题是在MainActivity中按下“Siguiente”按钮后应用程序崩溃了。我相信Manifest存在问题。

主要活动：

public class MainActivity extends AppCompatActivity {
    Button ENVIAR,SIGUIENTE;
    EditText NUMEROT;
    TextView CONTENIDO;
    IntentFilter intentFilter;

    private BroadcastReceiver intentReciever = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            String MENSAJE = intent.getExtras().getString("mensaje");
            String NUMERODELMENSAJE  = intent.getExtras().getString("numero");
            CONTENIDO=(TextView)findViewById(R.id.tvSMScontenido);
            CONTENIDO.setText(MENSAJE+NUMERODELMENSAJE);
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intentFilter = new IntentFilter();
        intentFilter.addAction("SMS_RECEIVED_ACTION");

        ENVIAR     = (Button) findViewById(R.id.bEnviarMA);
        SIGUIENTE  = (Button)findViewById(R.id.bSiguienteMA);
        NUMEROT    = (EditText)findViewById(R.id.etNumeroTelf);
        ENVIAR.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String ELMENSAJE = "1234020";
                String ELNUMERO = NUMEROT.getText().toString();
                EnviarSMS(ELMENSAJE, ELNUMERO);
                Toast.makeText(getApplicationContext(), "Ya esta ya", Toast.LENGTH_LONG).show();
            }
        });

        SIGUIENTE.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intento = new Intent(MainActivity.this, LucesAlarma.class);
                intento.putExtra("numero", NUMEROT.getText().toString());
                startActivity(intento);
            }
        });
    }

    @Override
    protected void onResume() {
        registerReceiver(intentReciever, intentFilter);
        super.onResume();
    }

    @Override
    protected void onPause() {
        unregisterReceiver(intentReciever);
        super.onPause();
    }

    protected void EnviarSMS(String elmensaje, String elnumero) {

        SmsManager SMS = SmsManager.getDefault();
        SMS.sendTextMessage(elnumero, null, elmensaje, null, null);
    }
}

第二项活动（LucesAlarma）

public class LucesAlarma extends AppCompatActivity {
    TextView NUMEROLA,MENSAJELA;
    Button ENVIARLA,ATRAS;
    IntentFilter intentFilterLA;

    private BroadcastReceiver intentRecieverLA = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent){

            String MENSAJE = intent.getExtras().getString("mensaje");
            String NUMERODELMENSAJE  = intent.getExtras().getString("numero");
            MENSAJELA=(TextView)findViewById(R.id.tvMensajeLA);
            MENSAJELA.setText(MENSAJE+NUMERODELMENSAJE);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_luces_alarma);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        Intent intent = getIntent();
        final String numeropos =intent.getStringExtra("numero");
        NUMEROLA=(TextView)findViewById(R.id.tvNumeroLA);
        NUMEROLA.setText(numeropos);

        ENVIARLA=(Button)findViewById(R.id.bEnviarLA);
        ENVIARLA.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String ELMENSAJE = "1234020";
                String ELNUMERO = numeropos;
                EnviarSMS(ELMENSAJE, ELNUMERO);
                Toast.makeText(getApplicationContext(), "Enviado", Toast.LENGTH_LONG).show();
            }
        });

        ATRAS=(Button)findViewById(R.id.bAtras);
        ATRAS.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intentoLA = new Intent(LucesAlarma.this, MainActivity.class);
                startActivity(intentoLA);
            }
        });

    }

    @Override
    protected void onResume() {
        registerReceiver(intentRecieverLA,intentFilterLA);
        super.onResume();
    }

    @Override
    protected void onPause() {
        unregisterReceiver(intentRecieverLA);
        super.onPause();
    }

    protected void EnviarSMS(String elmensaje, String elnumero) {

        SmsManager SMS = SmsManager.getDefault();
        SMS.sendTextMessage(elnumero, null, elmensaje, null, null);
    }
}

SMS Reciver java类：

public class ReceptorSMS extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Bundle bundle = intent.getExtras();
        SmsMessage[]messages=null;
        String str = "";
        String num = "";
        String men = "";
        if(bundle != null) {
            Object[] pdus = (Object[]) bundle.get("pdus");
            assert pdus != null;
            messages = new SmsMessage[pdus.length];
            for (int i=0 ; i<messages.length;i++) {
                messages[i]=SmsMessage.createFromPdu((byte[])pdus[i]);
                num = messages[i].getDisplayOriginatingAddress();
                str += "Mensaje de" +messages[i].getOriginatingAddress();
                str += ":";
                str += messages[i].getMessageBody();
                str += "\n";
                men = messages[i].getMessageBody();
            }
            //           Toast.makeText(context,str,Toast.LENGTH_SHORT).show();
            Intent broadcastIntent = new Intent();
            broadcastIntent.setAction("SMS_RECEIVED_ACTION");
            broadcastIntent.putExtra("sms", str);
            broadcastIntent.putExtra("mensaje", men);
            broadcastIntent.putExtra("numero", num);
            context.sendBroadcast(broadcastIntent);
        }
    }
}

而清单，我无法确定问题：'v

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.josue.smartwasip">

    <uses-permission android:name="android.permission.SEND_SMS"></uses-permission>
    <uses-permission android:name="android.permission.RECEIVE_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"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".LucesAlarma"
            android:label="@string/title_activity_luces_alarma"
            android:theme="@style/AppTheme.NoActionBar">

            <intent-filter>
                <action android:name="com.example.josue.smartwasi" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>

        </activity>
        <receiver android:name=".ReceptorSMS">
            <intent-filter>
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
        </receiver>
    </application>
</manifest>

这是注释：

03-08 15:39:15.059 1385-1385/com.example.josue.smartwasip E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.josue.smartwasip, PID: 1385
    java.lang.RuntimeException: Unable to resume activity {com.example.josue.smartwasip/com.example.josue.smartwasip.LucesAlarma}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.IntentFilter.writeToParcel(android.os.Parcel, int)' on a null object reference
        at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3103)
        at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3134)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481)
        at android.app.ActivityThread.-wrap11(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.IntentFilter.writeToParcel(android.os.Parcel, int)' on a null object reference
        at android.app.ActivityManagerProxy.registerReceiver(ActivityManagerNative.java:3008)
        at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1184)
        at android.app.ContextImpl.registerReceiver(ContextImpl.java:1152)
        at android.app.ContextImpl.registerReceiver(ContextImpl.java:1146)
        at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:554)
        at com.example.josue.smartwasip.LucesAlarma.onResume(LucesAlarma.java:76)
        at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1258)
        at android.app.Activity.performResume(Activity.java:6312)
        at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3092)
        at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3134) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481) 
        at android.app.ActivityThread.-wrap11(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:5417) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

Answer 1

您只是在[14, 56, 32, 40, 10] 声明IntentFilter intentFilterLA;。您还需要像LucesAlarma中为MainActivity.onCreate()分配一个值。

将这两行添加到IntentFilter

LucesAlarma.onCreate()