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POhow to set setLayoutParams for linear layout elements
 

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    <p>How to set <code>setLayoutParams()</code> for <code>LinearLayout</code> elements. in <code>MainActivity.java</code>. I wrote the following code for set Layout params and <code>nullPointerException</code> shown at the line no 50 and I paste Logcat file at last.</p> <pre><code>layoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, 50); imageview1.setLayoutParams(layoutParams); // line no 50 layoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, 50); textview1.setLayoutParams(layoutParams); layoutParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT); listview01.setLayoutParams(layoutParams); </code></pre> <p>This is my xml file </p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content" android:stackFromBottom="true" &gt; &lt;ImageView android:id="@+id/imageview1" android:layout_width="wrap_content" android:layout_height="50px" android:background="@drawable/applicationbar" android:layout_x="0px" android:layout_y="0px" &gt; &lt;/ImageView&gt; &lt;TextView android:id="@+id/textview1" android:layout_width="wrap_content" android:layout_height="50px" android:text="TextView" android:layout_x="0px" android:layout_y="55px" &gt; &lt;/TextView&gt; &lt;ListView android:id="@+id/ListView01" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginLeft="10px" android:layout_marginRight="10px" android:layout_marginTop="35px" android:layout_marginBottom="40px" android:paddingLeft="0px" android:paddingRight="0px" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>Log cat:</p> <pre><code>04-19 16:47:22.221: ERROR/AndroidRuntime(3437): Uncaught handler: thread main exiting due to uncaught exception 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android/com.android.Listview}: java.lang.NullPointerException 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.os.Handler.dispatchMessage(Handler.java:99) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.os.Looper.loop(Looper.java:123) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.app.ActivityThread.main(ActivityThread.java:4363) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at java.lang.reflect.Method.invokeNative(Native Method) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at java.lang.reflect.Method.invoke(Method.java:521) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at dalvik.system.NativeStart.main(Native Method) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): Caused by: java.lang.NullPointerException 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at com.android.Listview.onCreate(Listview.java:40) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 04-19 16:47:22.221: ERROR/AndroidRuntime(3437): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459) </code></pre>
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