java.lang.InstantiationException:无法实例化类:没有空构造函数

Question

我正在尝试在Android上创建游戏,但我对视图的实例有疑问.我正在使用一个膨胀的视图.

这是我的视图代码:

public class GameView extends TableLayout {

public GameView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

为了活动

public class GameActivity extends Activity {

private GameView view;

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    this.view = (GameView) View.inflate(this,R.layout.game, null);
}

这是错误

D/dalvikvm( 6176): newInstance failed: no <init>()
D/AndroidRuntime( 6176): Shutting down VM
W/dalvikvm( 6176): threadid=1: thread exiting with uncaught exception (group=0x41a80700)
E/AndroidRuntime( 6176): FATAL EXCEPTION: main
E/AndroidRuntime( 6176): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.android.homework.em.go/com.android.homework.em.go.GameView}: java.lang.InstantiationException: can't instantiate class com.android.homework.em.go.GameView; no empty constructor
E/AndroidRuntime( 6176):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
E/AndroidRuntime( 6176):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
E/AndroidRuntime( 6176):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
E/AndroidRuntime( 6176):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
E/AndroidRuntime( 6176):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 6176):    at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 6176):    at android.app.ActivityThread.main(ActivityThread.java:5103)
E/AndroidRuntime( 6176):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 6176):    at java.lang.reflect.Method.invoke(Method.java:525)
E/AndroidRuntime( 6176):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
E/AndroidRuntime( 6176):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime( 6176):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 6176): Caused by: java.lang.InstantiationException: can't instantiate class com.android.homework.em.go.GameView; no empty constructor
E/AndroidRuntime( 6176):    at java.lang.Class.newInstanceImpl(Native Method)
E/AndroidRuntime( 6176):    at java.lang.Class.newInstance(Class.java:1130)
E/AndroidRuntime( 6176):    at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
E/AndroidRuntime( 6176):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
E/AndroidRuntime( 6176):    ... 11 more
W/ActivityManager(  436):   Force finishing activity com.android.homework.em.go/.GameView

谢谢你的帮助 !

编辑:

1)问题是当我创建一个空构造函数时,我无法编译,因为它说构造函数与TableLayout的构造函数不兼容.

2)我正在使用View.inflate因为我在这个tutoriel上找到了它:http://www.therealjoshua.com/2012/07/android-architecture-part-10-the-activity-revisited/ 我想要的是设置我的活动的视图,部分由xml文件(layout.game)描述,部分使用类GameView.java创建programmaticaly我该怎么做？

Answer 1

实际上问题是因为我没有在清单文件中调用正确的活动.我打电话给GameView而不是GameActivity.