CODEWITHSUNDEEP
android
Emmanuel Padrixe
Emmanuel Padrixe

Reputation: 58

Android : Error when i set size of imageView inside TableRow programmatically

When i try to set size of my ImageView objet, i have always same error :

Attempt to write to field 'int android.view.ViewGroup$LayoutParams.width' on a null object reference

A piece of my code :

    TableLayout tl = (TableLayout)findViewById(R.id.layoutDuNiveau);
    for(int j=0;j<hauteurDuNiveau;j++){
        TableRow tr = new TableRow(this);
        tr.setLayoutParams(new TableLayout.LayoutParams(TableLayout.LayoutParams.WRAP_CONTENT, TableLayout.LayoutParams.WRAP_CONTENT));
        for(int i=0;i<largeurDuNiveau;i++){
            imageViewDuNiveau[i][j] = new ImageView(this);
            imageViewDuNiveau[i][j].setImageResource(R.drawable.blanc);
            imageViewDuNiveau[i][j].requestLayout();
            imageViewDuNiveau[i][j].getLayoutParams().width = 20; // ERROR HERE
            imageViewDuNiveau[i][j].getLayoutParams().height = 20; // ERROR HERE


            switch(tableauDuNiveau[i][j]){
                case '#':
                    imageViewDuNiveau[i][j].setImageResource(R.drawable.mur);
                default:
            }
            tr.addView(imageViewDuNiveau[i][j]);
        }
        tl.addView(tr);
    }

Upvotes: 1

Views: 1800

Answers (1)

ρяσѕρєя K
ρяσѕρєя K

Reputation: 132992

As see here:

View.getLayoutParams () :

This method may return null if this View is not attached to a parent ViewGroup or setLayoutParams(android.view.ViewGroup.LayoutParams) was not invoked successfully. When a View is attached to a parent ViewGroup, this method must not return null

To fix issue call add ImageView to tr before accessing width and height :

tr.addView(imageViewDuNiveau[i][j]);
imageViewDuNiveau[i][j].getLayoutParams().width = 20; 
imageViewDuNiveau[i][j].getLayoutParams().height = 20;

Upvotes: 4

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