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POOverflow of Android LinearLayout / Missing Components?
 

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  1. POOverflow of Android LinearLayout / Missing Components?
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    <p>I'm having trouble with what seems to be a very basic Android layout issue. I've simplified this to the sample below. I have two views:</p> <ol> <li>a custom view (MyCustomView) which just draws a blue rectangle with a red border and </li> <li>a TextView that says "Sample Text"</li> </ol> <p>I add these to a linear layout that I'm creating through code (not XML). If I add the TextView first, I get the following which makes sense to me: </p> <p><img src="https://i.stack.imgur.com/vBTim.png" alt="enter image description here"></p> <p>If however I swap the order of the two <code>layout.addView(...)</code> calls, the TextView is missing:</p> <p><img src="https://i.stack.imgur.com/ttSY4.png" alt="enter image description here"></p> <p>In the first case, the TextView expands to it's preferred width and then MyCustomView takes the rest. I'd like the second case to behave similarly - I again want the TextView to be as wide as its ideal width (IE just fitting the text) and want the custom view to take up the rest of the width. I specifically do not want to use absolute sizing - instead I want the custom component to just take up the residual. </p> <p>In Swing this is typically done with preferredSize but that doesn't seem to exist in Android. What am I missing? Thanks.</p> <pre><code>protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LinearLayout layout = new LinearLayout(this); MyCustomView myCustomView = new MyCustomView(this); TextView textView = new TextView(this); textView.setText("Sample Text"); layout.addView(myCustomView, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); layout.addView(textView, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); setContentView(layout); } public class MyCustomView extends View { private Paint paint = new Paint(); public MyCustomView(Context context) { super(context); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); // fill blue box paint.setColor(Color.BLUE); paint.setStyle(Paint.Style.FILL); canvas.drawRect(0, 0, getWidth(), getHeight(), paint); // draw red border paint.setColor(Color.RED); paint.setStyle(Paint.Style.STROKE); paint.setStrokeWidth(10); canvas.drawRect(0, 0, getWidth(), getHeight(), paint); } } </code></pre> <p><strong>EDIT Nov 18 5:52PM EST</strong> as per @Elhanan, I've changed the two addView(...) lines to be:</p> <pre><code>layout.addView(myCustomView, new LinearLayout.LayoutParams(0, LinearLayout.LayoutParams.WRAP_CONTENT, 1)); layout.addView(textView, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT, 0)); </code></pre>
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