Android的活动构造Android

2023-09-07 00:48:26 作者：寒辞

我注意到，使用快捷键Alt + Insert键并选择建筑商，它试图创建每个私有财产（ cManager 和 mTextView构造）。我记得我已经创建的项目，如果没有它，正确的工作。

当我运行该应用程序错误发生，继全面的logcat和活动构造器：

构造与私有财产：

 私人ConnectivityManager cManager;私人TextView的mTextView;公共SplashScreenActivity（）{    this.cManager =（ConnectivityManager）this.getSystemService（Context.CONNECTIVITY_SERVICE）;    this.mTextView =（TextView中）this.findViewById（R.id.mProgressText）;}

logcat的：

  02-20 18：20：56.155 1591年至1591年/ com.universo91.towersrock I /艺术：不晚启用-Xcheck：JNI（已上）02-20 18：20：58.355 1591年至1591年/ com.universo91.towersrock D / AndroidRuntime：关闭VM    ---------崩溃的开始02-20 18：20：58.361 1591年至1591年/ com.universo91.towersrock E / AndroidRuntime：致命异常：主要    工艺：com.universo91.towersrock，PID：1591    了java.lang.RuntimeException：无法实例活动ComponentInfo {com.universo91.towersrock / com.universo91.towersrock.Pages.SplashScreenActivity}：java.lang.InstantiationException：类com.universo91.towersrock.Pages.SplashScreenActivity没有零参数的构造函数            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2209）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）     java.lang.InstantiationException：引起类com.universo91.towersrock.Pages.SplashScreenActivity没有零参数的构造函数            在java.lang.Class.newInstance（Class.java:1563）            在android.app.Instrumentation.newActivity（Instrumentation.java:1065）            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2199）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）     java.lang.NoSuchMethodException：引起＆LT;＆初始化GT; []            在java.lang.Class.getConstructor（Class.java:531）            在java.lang.Class.getDeclaredConstructor（Class.java:510）            在java.lang.Class.newInstance（Class.java:1561）            在android.app.Instrumentation.newActivity（Instrumentation.java:1065）            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2199）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）02-20 18：20：58.772 1591年至1603年/ com.universo91.towersrock I /艺术：背景粘并发标记扫描GC释放1747（114KB）AllocSpace对象，0（0B）LOS对象，37％免费，391KB / 623KB，暂停825us总382.655ms02-20 18：21：29.824 1690至1690年/ com.universo91.towersrock D / AndroidRuntime：关闭VM02-20 18：21：29.829 1690至1690年/ com.universo91.towersrock E / AndroidRuntime：致命异常：主要    工艺：com.universo91.towersrock，PID：1690    了java.lang.RuntimeException：无法实例活动ComponentInfo {com.universo91.towersrock / com.universo91.towersrock.Pages.SplashScreenActivity}：java.lang.InstantiationException：类com.universo91.towersrock.Pages.SplashScreenActivity没有零参数的构造函数            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2209）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）     java.lang.InstantiationException：引起类com.universo91.towersrock.Pages.SplashScreenActivity没有零参数的构造函数            在java.lang.Class.newInstance（Class.java:1563）            在android.app.Instrumentation.newActivity（Instrumentation.java:1065）            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2199）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）     java.lang.NoSuchMethodException：引起＆LT;＆初始化GT; []            在java.lang.Class.getConstructor（Class.java:531）            在java.lang.Class.getDeclaredConstructor（Class.java:510）            在java.lang.Class.newInstance（Class.java:1561）            在android.app.Instrumentation.newActivity（Instrumentation.java:1065）            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2199）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）02-20 18：21：30.168 1690年至1702年/ com.universo91.towersrock I /艺术：背景粘并发标记扫描GC释放1749（114KB）AllocSpace对象，0（0B）LOS对象，37％免费，391KB / 623KB，暂停856us总166.355ms02-20 18：21：53.341 1690至1690年/ com.universo91.towersrock I /工艺：发送信号。 PID：1690 SIG：902-20 18：26：00.878 1754年至1754年/ com.universo91.towersrock D / AndroidRuntime：关闭VM02-20 18：26：00.903 1754年至1754年/ com.universo91.towersrock E / AndroidRuntime：致命异常：主要    工艺：com.universo91.towersrock，PID：1754    了java.lang.RuntimeException：无法实例活动ComponentInfo {com.universo91.towersrock / com.universo91.towersrock.Pages.SplashScreenActivity}：java.lang.IllegalStateException：之前的onCreate不向活动系统服务（）            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2209）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）     java.lang.IllegalStateException：引起的onCreate之前不向活动系统服务（）            在android.app.Activity.getSystemService（Activity.java:4989）            在com.universo91.towersrock.Pages.SplashScreenActivity＆LT;＆初始化GT;（SplashScreenActivity.java:24）            在java.lang.reflect.Constructor.newInstance（本机方法）            在java.lang.Class.newInstance（Class.java:1572）            在android.app.Instrumentation.newActivity（Instrumentation.java:1065）            在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2199）            在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2360）            在android.app.ActivityThread.access $ 800（ActivityThread.java:144）            在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1278）            在android.os.Handler.dispatchMessage（Handler.java:102）            在android.os.Looper.loop（Looper.java:135）            在android.app.ActivityThread.main（ActivityThread.java:5221）            在java.lang.reflect.Method.invoke（本机方法）            在java.lang.reflect.Method.invoke（Method.java:372）            在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:899）            在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:694）02-20 18：26：01.144 1754年至1766年/ com.universo91.towersrock I /艺术：背景粘并发标记扫描GC释放1745（118KB）AllocSpace对象，0（0B）LOS对象，38％免费，382KB / 623KB，暂停950us总131.218ms02-20 18：26：04.429 1754年至1754年/ com.universo91.towersrock I /工艺：发送信号。 PID：1754 SIG：9

解决方案

的Android不允许您覆盖活动的构造。你所有的初始化需要在你的活动的的onCreate（）的方法来进行：

  @覆盖公共无效的onCreate（捆绑savedInstanceState）{    super.onCreate（savedInstanceState）;    this.cManager =（ConnectivityManager）this.getSystemService（Context.CONNECTIVITY_SERVICE）;    this.mTextView =（TextView中）this.findViewById（R.id.mProgressText）;}

I noticed that using the shortcut Alt + Insert and selecting the builders, it tries to create a constructor with each private property (cManager and mTextView). I remember I already created projects without it and worked correctly.

The error happens when I run the application, following the full logcat and the Activity constructor:

Constructor with private property:

private ConnectivityManager cManager;
private TextView mTextView;

public SplashScreenActivity() {
    this.cManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    this.mTextView = (TextView)this.findViewById(R.id.mProgressText);
}

Logcat:

02-20 18:20:56.155    1591-1591/com.universo91.towersrock I/art﹕ Not late-enabling -Xcheck:jni (already on)
02-20 18:20:58.355    1591-1591/com.universo91.towersrock D/AndroidRuntime﹕ Shutting down VM
    --------- beginning of crash
02-20 18:20:58.361    1591-1591/com.universo91.towersrock E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.universo91.towersrock, PID: 1591
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.universo91.towersrock/com.universo91.towersrock.Pages.SplashScreenActivity}: java.lang.InstantiationException: class com.universo91.towersrock.Pages.SplashScreenActivity has no zero argument constructor
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.InstantiationException: class com.universo91.towersrock.Pages.SplashScreenActivity has no zero argument constructor
            at java.lang.Class.newInstance(Class.java:1563)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.NoSuchMethodException: <init> []
            at java.lang.Class.getConstructor(Class.java:531)
            at java.lang.Class.getDeclaredConstructor(Class.java:510)
            at java.lang.Class.newInstance(Class.java:1561)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-20 18:20:58.772    1591-1603/com.universo91.towersrock I/art﹕ Background sticky concurrent mark sweep GC freed 1747(114KB) AllocSpace objects, 0(0B) LOS objects, 37% free, 391KB/623KB, paused 825us total 382.655ms
02-20 18:21:29.824    1690-1690/com.universo91.towersrock D/AndroidRuntime﹕ Shutting down VM
02-20 18:21:29.829    1690-1690/com.universo91.towersrock E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.universo91.towersrock, PID: 1690
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.universo91.towersrock/com.universo91.towersrock.Pages.SplashScreenActivity}: java.lang.InstantiationException: class com.universo91.towersrock.Pages.SplashScreenActivity has no zero argument constructor
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.InstantiationException: class com.universo91.towersrock.Pages.SplashScreenActivity has no zero argument constructor
            at java.lang.Class.newInstance(Class.java:1563)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.NoSuchMethodException: <init> []
            at java.lang.Class.getConstructor(Class.java:531)
            at java.lang.Class.getDeclaredConstructor(Class.java:510)
            at java.lang.Class.newInstance(Class.java:1561)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-20 18:21:30.168    1690-1702/com.universo91.towersrock I/art﹕ Background sticky concurrent mark sweep GC freed 1749(114KB) AllocSpace objects, 0(0B) LOS objects, 37% free, 391KB/623KB, paused 856us total 166.355ms
02-20 18:21:53.341    1690-1690/com.universo91.towersrock I/Process﹕ Sending signal. PID: 1690 SIG: 9
02-20 18:26:00.878    1754-1754/com.universo91.towersrock D/AndroidRuntime﹕ Shutting down VM
02-20 18:26:00.903    1754-1754/com.universo91.towersrock E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.universo91.towersrock, PID: 1754
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.universo91.towersrock/com.universo91.towersrock.Pages.SplashScreenActivity}: java.lang.IllegalStateException: System services not available to Activities before onCreate()
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.IllegalStateException: System services not available to Activities before onCreate()
            at android.app.Activity.getSystemService(Activity.java:4989)
            at com.universo91.towersrock.Pages.SplashScreenActivity.<init>(SplashScreenActivity.java:24)
            at java.lang.reflect.Constructor.newInstance(Native Method)
            at java.lang.Class.newInstance(Class.java:1572)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-20 18:26:01.144    1754-1766/com.universo91.towersrock I/art﹕ Background sticky concurrent mark sweep GC freed 1745(118KB) AllocSpace objects, 0(0B) LOS objects, 38% free, 382KB/623KB, paused 950us total 131.218ms
02-20 18:26:04.429    1754-1754/com.universo91.towersrock I/Process﹕ Sending signal. PID: 1754 SIG: 9

解决方案

Android does not allow you to override the constructor of Activity. All your initializations need to be performed in the onCreate() method of your Activity:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.cManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
    this.mTextView = (TextView)this.findViewById(R.id.mProgressText);
}

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