2

我正在做我的最后一个项目，请帮助我，我必须在下周末之前提交它我正在开发一个基于上下文过滤来电的应用程序，首先我想接收来电号码并传递给一个活动在数据库上搜索数字并返回结果，我不知道如何从广播接收器获取变量并再次传递给它，我的意思是获取并将变量传递给只有 1 个广播接收器所以我决定使用 2 个广播接收器，其中一个接收传入的数字并传递给我的主类和我的 mainCalss 在数据库中搜索传入号码并将结果传递给 filterCall 广播类，但我遇到了问题。请帮助我，tHX

这是我的 callActivity 广播类，它接收传入的号码并传递给我的 Mainclass

    public class CallblockingActivity extends  BroadcastReceiver {


          Context context = null;
          private static final String TAG = "Phone call";
          private ITelephony telephonyService;
          String incommingNumber;
           Intent intent;
           String n;

        @Override

          public void onReceive(Context context, Intent intent) {
                   Log.v(TAG, "Receving....");
                   TelephonyManager telephony = (TelephonyManager) 
                   context.getSystemService(Context.TELEPHONY_SERVICE);  
                     try {
                         Class c = Class.forName(telephony.getClass().getName());
                         Method m = c.getDeclaredMethod("getITelephony");
                         m.setAccessible(true);
                         telephonyService = (ITelephony) m.invoke(telephony);           
                         Bundle b = intent.getExtras();
                         incommingNumber = b.getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
                         Log.v(TAG, incommingNumber);
                         Intent i = new Intent(context, Mainclass.class);
                         i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                         i.putExtra("n",incommingNumber);
                         context.startActivity(i);
                         Log.v(TAG, incommingNumber);

                     }
                     catch (Exception e) {
                      e.printStackTrace();
                     }

            }

  }

这是我的 mainClass，它从 CallBlockingActivity 广播类中获取传入号码并在数据库中搜索并返回一个布尔值

 public class Mainclass  extends Activity{
Context context = null;
Boolean isit= false;
String TAG;

   public void onCreate(Bundle savedInstanceState) {
        Log.v(TAG,"onCreate");
        super.onCreate(savedInstanceState);
       setContentView(R.layout.main);


       Intent b= getIntent();
        String incomiingnumber1= b.getStringExtra("n");
        Log.v(TAG,incomiingnumber1 + "incomenuber from broadcast receiver");
        DataBaseBON searching= new DataBaseBON(Mainclass.this);
       searching.open();
        isit= searching.searchnumber(incomiingnumber1);
        String ss= new Boolean(isit).toString();       
       Toast.makeText(getApplicationContext(), ss, Toast.LENGTH_SHORT);
       Log.v(TAG, ss+ "yeeeeeeees it is it");
       searching.close();

      //  I think My problem is here
       Intent in = new Intent(context, FilterCall.class);
       Bundle bb = new Bundle();
       bb.putString("keyvalue", "ss");
       in.putExtras(bb);
       startActivity(in);

   }

}

这是我的过滤器广播类，它拒绝来电或将手机设置为静音模式。

public class FilterCall  extends BroadcastReceiver {

private ITelephony telephonyService;
String TAG;
@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub


    Log.v(TAG, "Filtering...");
    TelephonyManager telephony = (TelephonyManager) 
    context.getSystemService(Context.TELEPHONY_SERVICE);  
      try {
         Class c = Class.forName(telephony.getClass().getName());
         Method m = c.getDeclaredMethod("getITelephony");
          m.setAccessible(true);
          telephonyService = (ITelephony) m.invoke(telephony);          

          String result = intent.getStringExtra("keyvalue");


                if (result=="true") {
                try {
                    telephonyService.silenceRinger();
                    telephonyService.endCall();
                } catch (RemoteException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


           }


      }
      catch (Exception e) {
       e.printStackTrace();
      }

 }

}

我面临这个问题：

    08-05 16:58:50.468: W/IInputConnectionWrapper(1500): showStatusIcon on inactive   InputConnection
    08-05 16:58:50.958: V/(1500): Filtering...
  08-05 16:58:51.118: V/Phone call(1500): Receving....
 08-05 16:58:51.118: V/Phone call(1500): +60172214866
 08-05 16:58:51.138: V/Phone call(1500): +60172214866
   08-05 16:58:51.168: V/(1500): onCreate
 08-05 16:58:51.248: V/(1500): +60172214866incomenuber from broadcast receiver
 08-05 16:58:51.278: I/Database(1500): SQLiteDatabase open path:  /data/data/com.vahid.davoudi/databases/databasebon.db
 08-05 16:58:51.338: V/(1500): trueyeeeeeeees it is it
   08-05 16:58:51.338: I/Database(1500): SQLiteDatabase close path:  /data/data/com.vahid.davoudi/databases/databasebon.db
 08-05 16:58:51.348: A/dalvikvm(1500): Exception!!! threadid=1: thread exiting with         uncaught exception (group=0x4001d858)
 08-05 16:58:51.388: E/AndroidRuntime(1500): FATAL EXCEPTION: main
 08-05 16:58:51.388: E/AndroidRuntime(1500): java.lang.RuntimeException: Unable to start  activity ComponentInfo{com.vahid.davoudi/com.vahid.davoudi.Mainclass}:  java.lang.NullPointerException
   08-05 16:58:51.388: E/AndroidRuntime(1500):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
 08-05 16:58:51.388: E/AndroidRuntime(1500):    at  android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at android.app.ActivityThread.access$2300(ActivityThread.java:125)
 08-05 16:58:51.388: E/AndroidRuntime(1500):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at android.os.Handler.dispatchMessage(Handler.java:99)
   08-05 16:58:51.388: E/AndroidRuntime(1500):  at android.os.Looper.loop(Looper.java:123)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at android.app.ActivityThread.main(ActivityThread.java:4627)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at java.lang.reflect.Method.invokeNative(Native Method)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at java.lang.reflect.Method.invoke(Method.java:521)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at dalvik.system.NativeStart.main(Native Method)
  08-05 16:58:51.388: E/AndroidRuntime(1500): Caused by: java.lang.NullPointerException
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at android.content.ComponentName.<init>(ComponentName.java:75)
      08-05 16:58:51.388: E/AndroidRuntime(1500):   at android.content.Intent.<init>(Intent.java:2690)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at com.vahid.davoudi.Mainclass.onCreate(Mainclass.java:39)
 08-05 16:58:51.388: E/AndroidRuntime(1500):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  08-05 16:58:51.388: E/AndroidRuntime(1500):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
   08-05 16:58:51.388: E/AndroidRuntime(1500):  ... 11 more
  08-05 17:03:51.408: W/PrintK(1500): m.vahid.davoudi(1500) sends SIGKILL to        m.vahid.davoudi(1500)

这是我的清单

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.vahid.davoudi"
android:versionCode="1"
android:versionName="1.0" >

<uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-sdk android:minSdkVersion="8" />

 <application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".Mainclass"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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


    <activity
        android:name=".CallBlockingOrginalActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".ViewDatabase"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.VIEWDB" />

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

    <receiver  android:name=".CallblockingActivity">
        <intent-filter   >
            <action android:name="android.intent.action.PHONE_STATE" />
        </intent-filter>
    </receiver>

    <receiver  android:name=".FilterCall">
        <intent-filter  android:priority="100" >
            <action android:name="android.intent.action.PHONE_STATE" />
        </intent-filter>
    </receiver>
  </application>

 </manifest>
4

2 回答 2

1

您在 Mainclass.java 的第 39 行有一个 nullPointerException

"b" 可能返回 null

Intent b = getIntent();

添加

if(b != null) {
    //code involving the use of b
}
于 2012-08-05T09:50:00.153 回答
1

对你的问题的一些建议，

1）您不需要在广播接收器中添加那么多代码来获取传入号码。而您可以直接使用下面的代码来获得它。

String number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);

2）您不需要启动活动来搜索数据库，您可以直接从Receivers on receive方法中搜索数据库中的这个数字（希望您的数据库不是太大，可能需要更多时间导致ANR）

3）您只能在第一个接收器中直接执行您在另一个接收器中所做的事情。它将删除大量代码并使其成为一种好方法。

对于您的代码中的本地问题，您正在使用以下代码发送广播消息

//  I think My problem is here
       Intent in = new Intent(context, FilterCall.class);
       Bundle bb = new Bundle();
       bb.putString("keyvalue", "ss");
       in.putExtras(bb);
       startActivity(in);

但是您正在调用 startActivity 而不是 sendBroadcast 方法，因为 FilterCall 是广播接收器。

你应该做这样的事情

       Intent in = new Intent("Intent Action which your receiver is listening to");
       in.putExtras("keyvalue", "ss");
      sendBroadcast(in);
于 2012-08-05T10:02:40.837 回答