Question

我有一个受保护的布尔值，如下所示

protected boolean isKeyInstalled(Context context) {
          // the packagename of the 'key' app
          String proPackage = "com.funhouse.mytimmieskey";

          // get the package manager
          final PackageManager pm = context.getPackageManager();

          // get a list of installed packages
          List<PackageInfo> list = pm.getInstalledPackages(PackageManager.GET_DISABLED_COMPONENTS);

          // let's iterate through the list
          Iterator<PackageInfo> i = list.iterator();
          while(i.hasNext()) {
            PackageInfo p = i.next();
            // check if proPackage is in the list AND whether that package is signed
            //  with the same signature as THIS package
            if((p.packageName.equals(proPackage)) &&
               (pm.checkSignatures(context.getPackageName(), p.packageName) == PackageManager.SIGNATURE_MATCH))
              return true;
          }
          return false;
        }

我试图让它显示广告，如果错误

if(isKeyInstalled(null) != false){
            //AdMob Banner
            LinearLayout parent = (LinearLayout) findViewById(R.id.adveiw);
            AdView ad = new AdView(this, AdSize.BANNER, "a14db2c31f42ef0");
            parent.addView(ad);
            AdRequest r = new AdRequest();
            r.setTesting(false);
            ad.loadAd(r);
        }

我没有代码错误，但这会不断兑现我的应用。

这里是logcat

05-11 00:18:37.253: INFO/ActivityManager(52): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.funhouse.mytimmies/.TimsMain bnds=[125,410][235,528] }
05-11 00:18:37.433: INFO/ActivityManager(52): Start proc com.funhouse.mytimmies for activity com.funhouse.mytimmies/.TimsMain: pid=1225 uid=10030 gids={3003}
05-11 00:18:37.814: DEBUG/ddm-heap(1225): Got feature list request
05-11 00:18:38.944: DEBUG/AndroidRuntime(1225): Shutting down VM
05-11 00:18:38.964: WARN/dalvikvm(1225): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
05-11 00:18:38.974: ERROR/AndroidRuntime(1225): Uncaught handler: thread main exiting due to uncaught exception
05-11 00:18:39.044: ERROR/AndroidRuntime(1225): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.funhouse.mytimmies/com.funhouse.mytimmies.TimsMain}: java.lang.NullPointerException
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.os.Looper.loop(Looper.java:123)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.app.ActivityThread.main(ActivityThread.java:4363)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at java.lang.reflect.Method.invokeNative(Native Method)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at java.lang.reflect.Method.invoke(Method.java:521)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at dalvik.system.NativeStart.main(Native Method)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225): Caused by: java.lang.NullPointerException
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at com.funhouse.mytimmies.TimsMain.isKeyInstalled(TimsMain.java:76)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at com.funhouse.mytimmies.TimsMain.onCreate(TimsMain.java:27)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
05-11 00:18:39.044: ERROR/AndroidRuntime(1225):     ... 11 more
05-11 00:18:39.095: INFO/Process(52): Sending signal. PID: 1225 SIG: 3

Answer 1

我猜final PackageManager pm = context.getPackageManager();是你的错误发生的第76行，因为你传递的上下文是空的......因为在onCreate方法中发生错误所以它无法启动Activity ...传递this（作为您的活动）作为上下文，它将解决您的问题。

if something = false展示广告

1 个答案: