Java – get only the top of the camera

A few days later, I got into this problem. All I wanted was a part of the camera displayed on the screen. That's what I wanted:

That's what I did:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="200dp">

    <ScrollView
            android:id="@+id/scrollView"
            android:layout_width="match_parent"
            android:layout_height="160dp"
            android:scrollbars="none"
            android:fillViewport="true"
            >
        <LinearLayout
                android:id="@+id/linearLayoutBeautyContent"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:orientation="vertical">
            <SurfaceView
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:id="@+id/surfaceViewBeautyCamera"/>
        </LinearLayout>
    </ScrollView>


    <TextView
            android:id="@+id/scanText"
            android:text="Scanning..."
            android:layout_height="wrap_content"
            android:layout_width="match_parent">
    </TextView>
</LinearLayout>



@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final LayoutInflater inflator = getLayoutInflater();
        final LinearLayout inflate = (LinearLayout) inflator.inflate(R.layout.main, null);

        final SurfaceView surfaceView = (SurfaceView) inflate.findViewById(R.id.surfaceViewBeautyCamera);
        final SurfaceHolder holder = surfaceView.getHolder();

        WindowManager mW = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        int screenWidth = mW.getDefaultDisplay().getWidth();
        int screenHeight = mW.getDefaultDisplay().getHeight();

        final ViewGroup.LayoutParams slayout = surfaceView.getLayoutParams();
        slayout.width = screenWidth;
        slayout.height = screenHeight;
        surfaceView.requestLayout();

        final ScrollView beautyContent = (ScrollView) inflate.findViewById(R.id.scrollView);

        holder.addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                try {
                    camera = getCamera();
                    camera.setPreviewDisplay(holder);
                    camera.setDisplayOrientation(90);
                    camera.startPreview();
                } catch (IOException e) {
                    Log.i("Lucy", e.getMessage());
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
            }
        });

        addContentView(inflate, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
    }
public Camera getCamera() {
    try {
        final Camera open = Camera.open();
        return open;
    } catch (Exception ex) {
        Log.i("Lucy", ex.getMessage());
        return null;
    }
}

When I do this, I get:

The idea is to set the size of the surfaceview to full screen, but reduce the size of the scrolling view. But what I want is the first picture. What did I do wrong?

Observation:

When I scroll the view completely. Return to the home screen and open the application again. I get the first picture. But if I scroll back and return to the main view again, I get the second picture

Are there any other strategies?

PS: 1. Other views on the top of the camera are also options, but I can't use it for a long time

resolvent:

The problem is the height setting of the element: your root element should be a relative layout. Then you can set the fixed height of the camera view and set the textview to match the height of the parent's text view and layout_ Below scrolling view