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Android programmatically created ImageView not showing

I am trying to create an array ImageViews

programmatically. Here is my code (i and j for counters)

imageViews = new ArrayList<ImageView>();
    for(int i = 0; i < 3; i++){
        for(int j = 0; j < 3; j++){
            if(3*i+j != 8) {
                ImageView subImage = new ImageView(this);
                subImage.setImageBitmap(pieces.get(3 * i + j));
                LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(100, 100);
                subImage.setLayoutParams(lp);
                subImage.setX(i * 100f);
                subImage.setY(j * 100f);
                subImage.setVisibility(View.VISIBLE);
                imageViews.add(subImage);
            }
        }
    }

pieces is an arrayist of bitmaps. Anyway, none of the image views are displayed. I'm new to all of this, so I'm sure I'm making all sorts of mistakes. Thanks in advance!

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4 answers


You need to add the view to your layout object as shown below.

layout_object.addView(subImage);



and finally you have to set which view you want to display like

setContentView(layout_object);



hope this answer is helpful to you.

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You need to create layout in XML file

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/linearLayout"
    android:orientation="vertical">

</LinearLayout>

and in java file



LinearLayout layout=(LinearLayout)view.findViewById(R.id.linearLayout);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                                android.widget.LinearLayout.LayoutParams.WRAP_CONTENT,
                                android.widget.LinearLayout.LayoutParams.WRAP_CONTENT);
    imageViews = new ArrayList<ImageView>();

        for(int i = 0; i < 3; i++){
            for(int j = 0; j < 3; j++){
                if(3*i+j != 8) {
                    ImageView subImage = new ImageView(this);
                    subImage.setImageBitmap(pieces.get(3 * i + j));                        
                    subImage.setVisibility(View.VISIBLE);
                    subImage.setLayoutParams(params);
                    imageViews.add(subImage);

                    layout.addView(subImage);

                }
            }
        }

NOTE : if you have more images that are not set on screen then first create a scroll and insert a linear layout

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you've created all the images, but you need a layout to display those images. let's say LinearLayout, so first create the layout in your xml file,

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/myLinearLayout"
    android:orientation="vertical">

</LinearLayout>

Now add images inside this layout.

LinearLayout linearLayout = (LinearLayout) findViewById(R.id.myLinearLayout);
imageViews = new ArrayList<ImageView>();
    for(int i = 0; i < 3; i++){
        for(int j = 0; j < 3; j++){
            if(3*i+j != 8) {
                ImageView subImage = new ImageView(this);
                subImage.setImageBitmap(pieces.get(3 * i + j));
                LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(100, 100);
                subImage.setLayoutParams(lp);
                subImage.setX(i * 100f);
                subImage.setY(j * 100f);
                subImage.setVisibility(View.VISIBLE);
                imageViews.add(subImage);

            }
        }
    }

for(int i=0; i< imageViews.size(); i++){ // iterating through the arraylist and adding the images to the linearlayout
    mylinearLayout.addView(imageViews.get(0));
}
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you have an array of image objects. just rename this array list and add to main parent layout

Suppose your main layout is RelativeLayout

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/mainlayout">
</LinearLayout>

store this object in java code

RelativeLayout rl=(RelativeLayout)findViewById(R.id.mainlayout);
//now iterate the arraylist of imageviews
for(ImageView iv:imageViews)
{
    rl.addView(iv);
}
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