Bdtjtk

For some reason when I set the x coordinate to screen_width - image_width, the image is displayed off the screen. The same scenario occurs with the y coordinate. Here is my code.

public class MainActivity extends AppCompatActivity {



    ImageView image;

    float height;

    float width;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        DisplayMetrics displayMetrics = new DisplayMetrics();

        getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);

        height = displayMetrics.heightPixels;

        width = displayMetrics.widthPixels;



        image.setImageResource(R.drawable.pigeon);

        image.setX(width - image.getMeasuredWidth());

In this case the image, which is a pigeon, is not displayed on the screen. And I expect it to be displayed so that the right border of the pigeon touches the right border of the screen.

Edit: It's not that I just want to position the image and be done with it. I want to be able to move the image to precise coordinates while the app is running, such as when a mouse click occurs.

One way to align the image right is to use the XML layout. This is the easiest method.

Assuming you have an ImageView inside a RelativeLayout you can use the `layout_alignParentRight' attribute as follows:

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/view"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="horizontal"

    tools:context=".MainActivity">

    <ImageView

        android:id="@+id/imageView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:contentDescription="@string/image_name"

        android:layout_alignParentRight="true"

        android:layout_alignParentEnd="true"

        />

</RelativeLayout>

The layout_alignParentEnd attribute is an alternative for layout_alignParentRight for right to left language script. For a LinearLayout you can use layout_gravity attribute. Also, ensure that your ImageView is wrap_content and not match_parent in which case the image will expand to fill the entire ImageView.

If you want to do it programmatically, you can do it in the following manner:

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        imageView = findViewById(R.id.imageView);

        imageView.setImageResource(R.drawable.pigeon);

        RelativeLayout.LayoutParams params = new 

        RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 

        RelativeLayout.LayoutParams.WRAP_CONTENT);

        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

        imageView.setLayoutParams(params);

    }

Here we are aligning the child view of RelativeLayout right by adding the align right rule and then setting that layout parameter for the Image View. This can also be done for LinearLayout using layout_gravity feature.

I have tested this code for a sample image. Hope this solves your problem.