Is it possible create view without xml in Android?

Question

I am trying to create a custom view without xml

public class MyView extends ViewGroup {

    public MyView (Context context) {
        super(context);
        setBackgroundColor(0xffff0000);

        RelativeLayout base = new RelativeLayout(context);

        RelativeLayout.LayoutParams rP = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        base.setBackgroundColor(0xff00ff00);
        base.setLayoutParams(rP);

        RelativeLayout.LayoutParams iP = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        ImageView icon = new ImageView(context);
        icon.setBackgroundResource(android.R.drawable.ic_menu_add);
        icon.setLayoutParams(iP);

        addView(icon);
        addView(base);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

    }
}

And use it in actitvy

MyView myview = new MyView(this);
WindowManager.LayoutParams baseParams = new WindowManager.LayoutParams(
        WindowManager.LayoutParams.MATCH_PARENT,
        WindowManager.LayoutParams.MATCH_PARENT,
        WindowManager.LayoutParams.TYPE_PHONE,
        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
        PixelFormat.TRANSLUCENT);
addContentView(myview, baseParams);

But the LayoutParams does not work, it display nothing

I must use this onLayout to make it display, and the base layout is not MATCH_PARENT and icon is not WRAP_CONTENT

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
    final View child = getChildAt(0);
    final View child2 = getChildAt(1);

    child.layout(0, 0, 300, 300);
    child2.layout(0, 0, 300, 300);
}

I also tried to add icon to layout, but the app will crash

base.addView(icon);

Is it possible to create this layout without hardcode the size and position?

I checked RelativeLayout.LayoutParams, but I cannot find any method to set it centerInParent to true.

http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@android:drawable/ic_menu_add"
        android:layout_centerInParent="true"
        />
</RelativeLayout>

WindowManager.LayoutParams are not for Views within an Activity. I'm not sure what you're trying to do, exactly, but if you want your custom View as the entire layout, just call setContentView() with it. Otherwise, add it to a ViewGroup that's in the Activity's layout. For centering with the RelativeLayout.LayoutParams, you're looking for the addRule() method. — Mike M.
– Mike M., Commented May 15, 2016 at 16:45
Also, ViewGroup does not know anything about laying out its children. Either actually implement the rest of the code for a custom ViewGroup (such as filling in the empty onLayout() method) or extend some other class that has specific layout rules (e.g., extend RelativeLayout instead of trying to wrap RelativeLayout). — CommonsWare
– CommonsWare, Commented May 15, 2016 at 16:54

Harsh4789 · Accepted Answer · 2016-05-15 16:51:11Z

3

Please give this code a try.

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {

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

        // Create parent RelativeLayout
        RelativeLayout relParent = new RelativeLayout(this);
        RelativeLayout.LayoutParams relParentParam = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
        relParent.setLayoutParams(relParentParam);

        // Create child ImageView
        ImageView imgView = new ImageView(this);
        RelativeLayout.LayoutParams imgViewParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        imgView.setLayoutParams(imgViewParams);
        imgView.setImageResource(android.R.drawable.ic_menu_add);
        imgViewParams.addRule(RelativeLayout.CENTER_IN_PARENT);

        // Add child ImageView to parent RelativeLayout
        relParent.addView(imgView);

        // Set parent RelativeLayout to your screen
        setContentView(relParent, relParentParam);
    }

}

answered May 15, 2016 at 16:51

Harsh4789

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1 Comment

Harsh4789 Over a year ago

Ok but title asks to create view without XML

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