Question

这些是详细问题：

java.lang.ClassCastException: com.android.layoutlib.bridge.android.BridgeContext cannot be cast to android.app.Activity
at io.jchat.android.view.LoginView.onMeasure_Original(LoginView.java:123);
at io.jchat.android.view.LoginView.onMeasure(LoginView.java) ;

我的代码是：

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    int height = MeasureSpec.getSize(heightMeasureSpec);
    mContext = getContext();
    Activity activity = (Activity)mContext;
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);

    int statusBarHeight = rect.top;

    activity.getWindowManager().getDefaultDisplay().getMetrics(dm);

    int screenHeight = dm.heightPixels;
    int diff = (screenHeight - statusBarHeight) - height;

    if(mListener != null){
        mListener.onSoftKeyboardShown(diff);
    }
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

作为新生，我渴望得到你的帮助。谢谢！

Answer 1

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    int height = MeasureSpec.getSize(heightMeasureSpec);

    int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");

    int statusBarHeight = 0;
    if (resourceId > 0) {

         statusBarHeight = getResources().getDimensionPixelSize(resourceId);
    }

    dm = getResources().getDisplayMetrics();

    int screenHeight = dm.heightPixels;
    int diff = (screenHeight - statusBarHeight) - height;
    if(mListener != null){
        mListener.onSoftKeyboardShown(diff);
    }
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

Answer 2

类com.android.layoutlib.bridge.android.BridgeContext不会扩展android.app.Activity，这是执行强制转换所需的条件。请检查这些类之间的关系。 Activity activity = (Activity)mContext;无法工作。

Android：java.lang.ClassCastException：com.android.layoutlib.bridge.android.BridgeContext无法强制转换为android.app.Activity“

2 个答案: