Android getLaunchIntentForPackage 返回 null

Question

我正在调用以下电话:

Intent launchIntent = context.getPackageManager()
                                 .getLaunchIntentForPackage(packageName);

它与 NPE 一起崩溃，堆栈跟踪如下:

java.lang.NullPointerException at android.app.Instrumentation.execStartActivity(Instrumentation.java:1423) at android.app.Activity.startActivityForResult(Activity.java:3584) at android.app.Activity.startActivityForResult(Activity.java:3545) at android.support.v4.app.FragmentActivity.void startActivityForResult(android.content.Intent,int)(SourceFile:817) at android.app.Activity.startActivity(Activity.java:3787) at android.app.Activity.startActivity(Activity.java:3755) at utils.AppsLauncher.voidlaunchApp(android.content.Context,java.lang.String)(SourceFile:100) at utils.AppsLauncher.void launchAppIfInstalledOtherwiseMarket(android.app.Activity,java.lang.String,utils.AppReportingParams)(SourceFile:73) at utils.AppsLauncher.void launchAppIfInstalledOtherwiseMarket(android.app.Activity,java.lang.String)(SourceFile:51) at adapters.BaseGamesListAdapter.void launchAppIfInstalledOtherwiseMarket(java.lang.String)(SourceFile:119) at adapters.UserGamesAdapter$UserGameUIHolder$1.void onClick(android.view.View)(SourceFile:198) at android.view.View.performClick(View.java:4658) at android.view.View$PerformClick.run(View.java:19461) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5692) 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:1291) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107) at dalvik.system.NativeStart.main(Native Method)

我假设 getLaunchIntentForPackage(packageName) 返回一个 null Intent。我无法在 GREPcode 中弄清楚为什么它返回 null: ( http://grepcode.com/file/repo1.maven.org/maven2/org.robolectric/android-all/5.0.0_r2-robolectric-0/android/app/ApplicationPackageManager.java#ApplicationPackageManager.getLaunchIntentForPackage%28java.lang.String%29 )

重要的是要注意该包确实存在并且安装在设备上。

Answer 1

context 或 context.getPackageManager() 为空。