Set margin dynamically

user_12903173 0
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I am trying to make the statusbar translucent, but dont want, that the content of my activity is hiding behind it. -> I have to set the top margin dynamically...

I have tried it like that: MainActivty.java:

    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        View view = findViewById(android.R.id.content).getRootView();
        WindowManager.LayoutParams newLayoutParams = (WindowManager.LayoutParams) view.getLayoutParams();
        view.setOnApplyWindowInsetsListener(new View.OnApplyWindowInsetsListener() {
            @Override
            public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
                int x = insets.getSystemWindowInsetTop();
                Log.d(TAG, "onApplyWindowInsets: " + x);
                //newLayoutParams.topMargin = x;

                //newLayoutParams.setMargins(0,x,0,0);
                view.setLayoutParams(newLayoutParams);
                return insets;
            }
        });
        setContentView(view);

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);

    }

Sadly this does not work. Error message:

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.rxstudios.rxmusic2, PID: 6324 java.lang.ClassCastException: android.view.WindowManager$LayoutParams cannot be cast to androidx.constraintlayout.widget.ConstraintLayout$LayoutParams at com.rxstudios.rxmusic2.MainActivity.onAttachedToWindow(MainActivity.java:77) at androidx.appcompat.view.WindowCallbackWrapper.onAttachedToWindow(WindowCallbackWrapper.java:129) at com.android.internal.policy.DecorView.onAttachedToWindow(DecorView.java:1537) at android.view.View.dispatchAttachedToWindow(View.java:18347) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3397) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1761) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1460) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7183) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949) at android.view.Choreographer.doCallbacks(Choreographer.java:761) at android.view.Choreographer.doFrame(Choreographer.java:696) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6669) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

How else would I do this if it doesn't let me get my Constraintlayout like that? Since it is a constraintlayout, I thought about getting the first child of it, which is a fragment. Can I set the margin to the fragment? If yes, how?

native layout android java
1 Answers

java.lang.ClassCastException: android.view.WindowManager$LayoutParams cannot be cast to androidx.constraintlayout.widget.ConstraintLayout$LayoutParams

change code :

    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        View view = findViewById(R.id.content).getRootView();
        // TODO: 2021/5/17  
//        WindowManager.LayoutParams newLayoutParams = (WindowManager.LayoutParams) view.getLayoutParams();
        ConstraintLayout.LayoutParams newLayoutParams = (ConstraintLayout.LayoutParams) view.getLayoutParams();
        view.setOnApplyWindowInsetsListener(new View.OnApplyWindowInsetsListener() {
 
            @Override
            public WindowInsets onApplyWindowInsets(View v, WindowInsets insets) {
                int x = insets.getSystemWindowInsetTop();
                Log.d(TAG, "onApplyWindowInsets: " + x);
                //newLayoutParams.topMargin = x;

                //newLayoutParams.setMargins(0,x,0,0);
                view.setLayoutParams(newLayoutParams);
                return insets;
            }
        });
        setContentView(view);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
    }

Or dont change the java code, change the view of R.id.content to LinearLayout

user_11507120
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