我正在做我的期末项目，请帮助我，我必须在下周末之前提交它 我正在开发一个根据上下文过滤来电的应用程序，首先我想获取传入号码并传递给 Activity 以在数据库上搜索号码并返回结果，我不知道如何从广播接收器获取变量并将其传递给它再说一次，我的意思是获取变量并将其传递给 1 个广播接收器，所以我决定使用 2 个广播接收器，其中一个接收传入号码并传递给我的主类，我的 mainCalss 在数据库上搜索传入号码并将结果传递给 filterCall 广播类，但是我遇到了问题。请帮助我，tHX
这是我的 callActivity Broadcast 类，它接收传入号码并传递给我的 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 广播类获取传入号码并在数据库中搜索并返回 bool 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，它拒绝调用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 list
<?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>
最佳答案
Mainclass.java 第 39 行出现 nullPointerException
“b”有可能返回 null
Intent b = getIntent();
添加
if(b != null) {
//code involving the use of b
}
关于android - 如何将变量传递给broadCastReceiver，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11815354/