CODEWITHSUNDEEP
androidimageviewandroid-canvas
Hari Krishnan
Hari Krishnan

Reputation: 6302

Drawing a line above the ImageView in android

I have a custom imageView, say MyImageView class and i am trying to draw some lines above it.

public class MyImageView extends ImageView
{

public MyImageView(Context context) {
    super(context);

    invalidate();
    // TODO Auto-generated constructor stub
}

public MyImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
    invalidate();
}

public MyImageView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    invalidate();
}

@Override
protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
    p.setColor(Color.BLACK);
    canvas.drawLine(0, 0, 100, 100, p);

    canvas.drawLine(0, 0, 20, 20, p);
    canvas.drawLine(20, 0, 0, 20, p);
    super.onDraw(canvas);


}
}

In my activity class i have set an image to that custom imageView with the help of a bitmap.

MyImageView imageView;
 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imageView=(MyImageView)findViewById(R.id.image);
    Bitmap dbitmap = BitmapFactory.decodeResource(getResources(), R.drawable.dinkan);
    Bitmap bitmap = dbitmap.copy(Bitmap.Config.ARGB_8888, true);
    imageView.setImageBitmap(bitmap);
    imageView.invalidate();
}

So now the problem is, the lines are drawn under the image so that i cannot see it. I want the lines to be drawn over the image. How should i implement it?

Upvotes: 4

Views: 1579

Answers (2)

Muhamed El-Banna
Muhamed El-Banna

Reputation: 617

You can add a Horizontal line by creating view like this

<View
    android:id="@+id/line_77"
    android:layout_width="match_parent"
    android:layout_height="3dp"
    android:layout_below="@+id/relativeLayout8"
    android:layout_marginTop="5dp" />

Upvotes: 0

Srijith
Srijith

Reputation: 1715

Try writing the canvas.drawLine() code below the super.onDraw(canvas). This means that first the imageview's default implementation will happen and after that the custom implementation i.e., the line will be drawn.

Upvotes: 2

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