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Android应用程序崩溃，错误提示为java.lang.RuntimeException：无法实例化活动ComponentInfo。

javaandroid
3
我正在开发一款Android应用程序。当我试图在模拟器上运行它时，它会崩溃。这是我第一个Android应用程序，我无法找出错误的原因。有人可以指出我的错误吗？
LogCat
    Shutting down VM
FATAL EXCEPTION: main
 Process: io.github.ishankgulati.breakout, PID: 3589
 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{io.github.ishankgulati.breakout/io.github.ishankgulati.breakout.BreakoutGame}: java.lang.IllegalAccessException: void io.github.ishankgulati.breakout.BreakoutGame.<init>() is not accessible from java.lang.Class<android.app.Instrumentation>
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
     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.IllegalAccessException: void io.github.ishankgulati.breakout.BreakoutGame.<init>() is not accessible from java.lang.Class<android.app.Instrumentation>
     at java.lang.Class.newInstance(Native Method)
     at android.app.Instrumentation.newActivity(Instrumentation.java:1067)
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2317)
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
     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) 
12-29 19:10:34.689 3589-3589/? I/Process: Sending signal. PID: 3589 SIG: 9

您可以在这里查看我的项目。

上述问题已解决，但应用程序仍崩溃。

LogCat

I/art: Not late-enabling -Xcheck:jni (already on)
I/art: Late-enabling JIT
I/art: JIT created with code_cache_capacity=2MB compile_threshold=1000
W/System: ClassLoader referenced unknown path: /data/app/io.github.ishankgulati.breakout-1/lib/x86
E/WVMExtractor: Failed to open libwvm.so: dlopen failed: library "libwvm.so" not found
I/OMXClient: Using client-side OMX mux.
D/MediaPlayer: setSubtitleAnchor in MediaPlayer
W/art: Suspending all threads took: 33.410ms
I/OMXClient: Using client-side OMX mux.
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: io.github.ishankgulati.breakout, PID: 2303
java.lang.RuntimeException: Unable to start activity ComponentInfo{io.github.ishankgulati.breakout/io.github.ishankgulati.breakout.BreakoutGame}: java.lang.NullPointerException: Attempt to write to field 'float android.graphics.RectF.left' on a null object reference
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
   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 write to field 'float android.graphics.RectF.left' on a null object reference
   at io.github.ishankgulati.breakout.MainMenu.<init>(MainMenu.java:33)
   at io.github.ishankgulati.breakout.BreakoutGame$BreakoutView.<init>(BreakoutGame.java:84)
   at io.github.ishankgulati.breakout.BreakoutGame$BreakoutView.<init>(BreakoutGame.java:51)
   at io.github.ishankgulati.breakout.BreakoutGame.onCreate(BreakoutGame.java:29)
   at android.app.Activity.performCreate(Activity.java:6237)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
   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) 
http://developer.android.com/reference/java/lang/IllegalAccessException.html - 2Dee
3个回答
6

你的BreakoutGame

public class BreakoutGame extends Activity{

重写默认构造函数会改变其可见性，这会导致异常。不要这样做。您在构造函数中想要进行的每个初始化都可以在框架调用的回调函数之一中完成。例如onCreate。

这解决了这个错误，但现在我又得到了一个新的错误。 - Ishank Gulati
你能和我们分享一下吗？ - Blackbelt
感谢您的帮助。我已经编辑了问题并添加了当前日志。 - Ishank Gulati
1
在MainMenu的构造函数中，在playButton.rect.left = 0之前添加playButton.rect = new Rectf()。 - Blackbelt
3

这是因为在你的BreakoutGame活动中，你有一个空构造函数，没有任何访问修饰符（默认为包私有）。

BreakoutGame() {
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        screenX = size.x;
        screenY = size.y;
    }

请将其更改为
public BreakoutGame(){
.....
}

它一定会起作用。

再次将您的代码从构造函数移动到onCreate方法中。

3
自从我在修复lint错误时从App.java中删除了public访问修饰符以来，我一直遇到这个异常。添加回public关键字立即解决了问题。
public class MyApp extends Application
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