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POWhy do I get NullPointerException when use setCurrentText or setText for TextSwitcher?
 

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  1. POWhy do I get NullPointerException when use setCurrentText or setText for TextSwitcher?
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    <p><code>TextSwitcher</code> is part of <code>ListView</code> row (defined in xml). I define the text of TextSwitcher in the setViewValue:</p> <pre><code>switch(viewId) { case R.id.tw_text: TextSwitcher twText = (TextSwitcher) view; twText.setCurrentText("test text"); return true; </code></pre> <p>This code works perfectly if <code>twText</code> is <code>TextView</code>. But it returns NullPointerException with <code>TextSwitcher</code>:</p> <pre><code>05-22 10:24:08.781: ERROR/AndroidRuntime(3348): FATAL EXCEPTION: main 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): java.lang.NullPointerException 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.TextSwitcher.setCurrentText(TextSwitcher.java:89) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at my.package.MainActivity$1.setViewValue(MainActivity.java:87) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:126) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.CursorAdapter.getView(CursorAdapter.java:186) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.AbsListView.obtainView(AbsListView.java:1315) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.ListView.onMeasure(ListView.java:1109) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:696) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.onMeasure(LinearLayout.java:306) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.measureVertical(LinearLayout.java:526) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.View.measure(View.java:8171) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.os.Handler.dispatchMessage(Handler.java:99) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.os.Looper.loop(Looper.java:123) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at android.app.ActivityThread.main(ActivityThread.java:4627) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at java.lang.reflect.Method.invokeNative(Native Method) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at java.lang.reflect.Method.invoke(Method.java:521) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 05-22 10:24:08.781: ERROR/AndroidRuntime(3348): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p><strong>Update 1</strong>: <a href="http://android-argentina.blogspot.com/2010/11/android-tip-textswitcher-and.html">looks like</a> I need to add setFactory() to my code. But if I do the following:</p> <pre><code> TextSwitcher twText = (TextSwitcher) view; twText.setFactory(new ViewSwitcher.ViewFactory() { @Override public View makeView() { TextView t = new TextView(MainActivity.this); return t; } }); </code></pre> <p>I am getting another error:</p> <pre><code>05-22 10:54:42.852: ERROR/AndroidRuntime(3907): java.lang.IllegalStateException: Can't add more than 2 views to a ViewSwitcher 05-22 10:54:42.852: ERROR/AndroidRuntime(3907): at android.widget.ViewSwitcher.addView(ViewSwitcher.java:64) 05-22 10:54:42.852: ERROR/AndroidRuntime(3907): at android.widget.TextSwitcher.addView(TextSwitcher.java:67) 05-22 10:54:42.852: ERROR/AndroidRuntime(3907): at android.view.ViewGroup.addView(ViewGroup.java:1845) </code></pre> <p><strong>Update 2</strong>: I've added <code>twText.removeAllViews()</code> before <code>twText.setFactory()</code>. It works, but looks like not the best way to delete and add Views again. How can I check if Views are already there?</p> <p>Also, I would like to keep formatting/style of my TextSwitcher in the xml. Usage of setFactory doesn't allow me to do so. What can I do?</p>
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