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POcustom scrollview not appearing
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  1. POcustom scrollview not appearing
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    copied!<p>I have a custom ScrollView that works fine if it is the only thing in the emulator. </p> <p>For example, this works fine:</p> <pre><code> public class Timeline2Activity extends Activity { private TimelineView tlv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); tlv = new TimelineView(this); setContentView(tlv); } } </code></pre> <p>But if I first add widgets then it fails to appear. I've searched and experimented for 2 days and nothing works. </p> <p>Here is the class declaration of the custom ScrollView:</p> <pre><code>public class TimelineView extends ScrollView implements OnTouchListener { </code></pre> <p>And here are the constructors:</p> <pre><code>public TimelineView(Context context) { super(context); this.setOnTouchListener(this); setVisibility(VISIBLE); } //the following constructor is needed to inflate the view from XML public TimelineView(Context context, AttributeSet ats) { super(context,ats); this.setOnTouchListener(this); setVisibility(VISIBLE); } </code></pre> <p>Here is the main.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/container" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" &gt; &lt;Button android:id="@+id/zoomall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Zoom All" /&gt; &lt;Button android:id="@+id/zoomout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="-" /&gt; &lt;Button android:id="@+id/zoomin" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="+" /&gt; &lt;Spinner android:id="@+id/category_spinner" android:layout_width="fill_parent" android:layout_height="wrap_content" android:prompt="@string/category_prompt" /&gt; &lt;/LinearLayout&gt; &lt;com.projects.timeline2.TimelineView android:id="@+id/timeline_view" android:layout_width="fill_parent" android:layout_height="wrap_content"/&gt; &lt;/LinearLayout&gt; </code></pre> <p>And here is the main program:</p> <pre><code>public class Timeline2Activity extends Activity { private TimelineView tlv; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //tlv = new TimelineView(this); //setContentView(tlv); setContentView(R.layout.main); Spinner spinnerCategory = (Spinner) findViewById(R.id.category_spinner); ArrayAdapter&lt;CharSequence&gt; adapterCategory = ArrayAdapter.createFromResource( this, R.array.categories, android.R.layout.simple_spinner_item); adapterCategory.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinnerCategory.setAdapter(adapterCategory); spinnerCategory.setOnItemSelectedListener(new MyOnItemSelectedListener()); //TimelineView tlv = (TimelineView) findViewById(R.id.timeline_view); //ViewGroup container = (ViewGroup) findViewById(R.id.container); //container.addView(tlv); } public class MyOnItemSelectedListener implements OnItemSelectedListener { public void onItemSelected(AdapterView&lt;?&gt; parent, View view, int pos, long id) { Toast.makeText(parent.getContext(), "The selection is " + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show(); } public void onNothingSelected(AdapterView parent) { // Do nothing. } } } </code></pre> <p>The lines commented out are stuff I've tried but didn't work either.</p> <p>This code correctly puts 3 buttons and a spinner in a horizontal row across the top. But TimelineView fails to appear below them. I know that TimelineView is running because I can see debugging output in the LogCat that I put in.</p> <p>I'm at my wits end and hope someone can shed some light. This seems like a common fundamental need and sure deserves a google tutorial.</p>
 

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