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POIf condition causing program to force close
 

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    <p>I am doing an android app and i was thinking of creating a theme option. Well all I was thinking of doing was to allow the user to click on a image button which represented a theme. And when he clicks on it I start a new activity i.e i direct him to the home page. Also i have created a few integer variables which are set to 1 when the user clicks on a button. </p> <p>Then in the other classes all i do is check if the variables are 1 or not and depending on that i apply the theme. By theme i mean i just change the background wallpaper. But this is not working. I mean the code works but if use an if loop to check the variable values and then apply the effects it causes an error.</p> <p>Here's the complete code:</p> <pre><code>package com.example.themetest; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.ImageButton; import android.widget.LinearLayout; public class MainActivity extends Activity implements OnClickListener{ ImageButton ib1; ImageButton ib2; int water=0; int fire=0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ib1 = (ImageButton) findViewById(R.id.imageButton1); ib2 = (ImageButton) findViewById(R.id.imageButton2); ib1.setOnClickListener(this); ib2.setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub switch(v.getId()){ case R.id.imageButton1: water = 1; Intent wi = new Intent("com.example.themetest.THEME"); startActivity(wi); break; case R.id.imageButton2: fire = 1; Intent fi = new Intent("com.example.themetest.THEME"); startActivity(fi); break; } } } </code></pre> <p>Here's the other class where i check which variable is set to 1 and apply the effect.</p> <pre><code>package com.example.themetest; import java.io.InputStream; import android.app.Activity; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.widget.EditText; import android.widget.LinearLayout; public class Theme extends Activity{ MainActivity main; Resources res; Drawable drawable; LinearLayout linearLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.theme); if(main.water==1){ res = getResources(); drawable = res.getDrawable(R.drawable.water_theme); linearLayout = (LinearLayout)findViewById(R.id.ll); linearLayout.setBackgroundDrawable(drawable); } else if(main.fire==1){ res = getResources(); drawable = res.getDrawable(R.drawable.fire_theme); linearLayout = (LinearLayout)findViewById(R.id.ll); linearLayout.setBackgroundDrawable(drawable); } else{ res = getResources(); drawable = res.getDrawable(R.drawable.ic_launcher); linearLayout = (LinearLayout)findViewById(R.id.ll); linearLayout.setBackgroundDrawable(drawable); } } } </code></pre> <p>I can change the wallpaper without using the if loop, but i want to do it this way which is not working. Can anyone please tell me why?</p> <p>Log cat:</p> <pre><code>01-15 12:08:23.339: D/dalvikvm(273): GC_EXTERNAL_ALLOC freed 767 objects / 55936 bytes in 235ms 01-15 12:08:25.539: D/AndroidRuntime(273): Shutting down VM 01-15 12:08:25.539: W/dalvikvm(273): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 01-15 12:08:25.559: E/AndroidRuntime(273): FATAL EXCEPTION: main 01-15 12:08:25.559: E/AndroidRuntime(273): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.themetest/com.example.themetest.Theme}: java.lang.NullPointerException 01-15 12:08:25.559: E/AndroidRuntime(273): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.os.Handler.dispatchMessage(Handler.java:99) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.os.Looper.loop(Looper.java:123) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.app.ActivityThread.main(ActivityThread.java:4627) 01-15 12:08:25.559: E/AndroidRuntime(273): at java.lang.reflect.Method.invokeNative(Native Method) 01-15 12:08:25.559: E/AndroidRuntime(273): at java.lang.reflect.Method.invoke(Method.java:521) 01-15 12:08:25.559: E/AndroidRuntime(273): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 01-15 12:08:25.559: E/AndroidRuntime(273): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 01-15 12:08:25.559: E/AndroidRuntime(273): at dalvik.system.NativeStart.main(Native Method) 01-15 12:08:25.559: E/AndroidRuntime(273): Caused by: java.lang.NullPointerException 01-15 12:08:25.559: E/AndroidRuntime(273): at com.example.themetest.Theme.onCreate(Theme.java:29) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 01-15 12:08:25.559: E/AndroidRuntime(273): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 01-15 12:08:25.559: E/AndroidRuntime(273): ... 11 more 01-15 12:08:31.089: I/Process(273): Sending signal. PID: 273 SIG: 9 </code></pre>
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    1. COWhat does the error look like? Maybe a `NullPointerEception` because `main` is not initialized?
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    2. COI don't see the initialization of `main` anywhere.
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    3. COThis isn't how android's Activity class fields works. if you want to pass value of one Activity to next, use Bundle or Intent with key-value pair. Have a look at [this post](http://stackoverflow.com/q/6277662/593709)
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