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POAdd a layout dynamically, to overlapp the other layout
 

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  1. POAdd a layout dynamically, to overlapp the other layout
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    <p>I'm writing a "Welcome Screen" for my application, that runs when application launches for the first time. <strong>What I want:</strong> A transparent layout to be overlapped on the root layout, dynamically through code. like this image:</p> <p><img src="https://i.stack.imgur.com/3mhjN.png" alt="enter image description here"></p> <p>but when I run my app, It crashes due to NULLPOINTEREXCEPTION. even when I didn't add the second layout</p> <p><strong>Problem 1:</strong> Why first layout doesn't show up, and app crashes?</p> <p><strong>Problem 2:</strong> How to show the second layout?</p> <p>thanks in advance....</p> <p><strong>Authentication.java</strong></p> <pre><code>import component.Util; public class Authentication extends Activity { private RelativeLayout rootLayout; public static Context CONTEXT; public Authentication(){ CONTEXT=this; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); rootLayout=new RelativeLayout(CONTEXT); LinearLayout firstLayout=(LinearLayout) findViewById(R.layout.authentication); rootLayout.addView(firstLayout); setContentView(rootLayout); if(Util.isFirstLaunch(CONTEXT)){ //Add the second layout } } } </code></pre> <p><strong>authentication.xml</strong></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/authentication" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="@drawable/background" &gt; &lt;TextView android:id="@+id/textView_login" android:layout_width="210dp" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:layout_marginBottom="12dp" android:layout_marginLeft="4dp" android:layout_marginRight="4dp" android:layout_gravity="center_horizontal" android:text="@string/loginText" android:textSize="18sp" /&gt; &lt;EditText android:id="@+id/editText_username" android:layout_width="210dp" android:layout_height="wrap_content" android:layout_marginTop="4dp" android:layout_marginBottom="4dp" android:layout_marginLeft="4dp" android:layout_marginRight="4dp" android:layout_gravity="center_horizontal" android:nextFocusDown="@+id/editText_password" android:inputType="textPersonName" android:hint="@string/username" /&gt; &lt;EditText android:id="@+id/editText_password" android:layout_width="210dp" android:layout_height="wrap_content" android:layout_marginTop="4dp" android:layout_marginBottom="12dp" android:layout_marginLeft="4dp" android:layout_marginRight="4dp" android:layout_gravity="center_horizontal" android:inputType="textPassword" android:hint="@string/password" /&gt; &lt;Button android:id="@+id/button_submit" android:layout_width="140dp" android:layout_height="wrap_content" android:layout_marginTop="14dp" android:layout_gravity="center_horizontal" android:background="@drawable/button" android:text="@string/submit" android:textColor="#e1ecff" /&gt; &lt;/LinearLayout&gt; </code></pre> <p><strong>stack trace:</strong></p> <pre><code>08-31 13:50:32.623: D/AndroidRuntime(5740): Shutting down VM 08-31 13:50:32.623: W/dalvikvm(5740): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 08-31 13:50:32.643: E/AndroidRuntime(5740): FATAL EXCEPTION: main 08-31 13:50:32.643: E/AndroidRuntime(5740): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.shayan.filesharing/com.shayan.filesharing.Authentication}: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.RelativeLayout 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.ActivityThread.access$600(ActivityThread.java:141) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.os.Handler.dispatchMessage(Handler.java:99) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.os.Looper.loop(Looper.java:137) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.ActivityThread.main(ActivityThread.java:5041) 08-31 13:50:32.643: E/AndroidRuntime(5740): at java.lang.reflect.Method.invokeNative(Native Method) 08-31 13:50:32.643: E/AndroidRuntime(5740): at java.lang.reflect.Method.invoke(Method.java:511) 08-31 13:50:32.643: E/AndroidRuntime(5740): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 08-31 13:50:32.643: E/AndroidRuntime(5740): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 08-31 13:50:32.643: E/AndroidRuntime(5740): at dalvik.system.NativeStart.main(Native Method) 08-31 13:50:32.643: E/AndroidRuntime(5740): Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.RelativeLayout 08-31 13:50:32.643: E/AndroidRuntime(5740): at com.shayan.filesharing.Authentication.onCreate(Authentication.java:22) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.Activity.performCreate(Activity.java:5104) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 08-31 13:50:32.643: E/AndroidRuntime(5740): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 08-31 13:50:32.643: E/AndroidRuntime(5740): ... 11 more </code></pre>
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    1. USShayan_Aryan
    1. USShayan_Aryan
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    1. COThe `Context` is valid only starting with the `onCreate` method so please don't do `CONTEXT=this;` in the constructor of the `Activity`.
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      1. POAdd a layout dynamically, to overlapp the other layout
      1. USLuksprog
 

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