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POHow to change the background of activity in fragment?
 

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  1. POHow to change the background of activity in fragment?
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    <p>I want to change the background of activity in fragment. </p> <p>When I click the button in the <code>Fragment</code> , it choose the picture. And set the picture to the background of Activity.</p> <p>The following code is in Fragment:</p> <pre><code>public class MjpegPlayerFragment extends Fragment { private RelativeLayout relativeLayout; </code></pre> <p>public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {</p> <pre><code> Log.d(TAG, "Fragment View Created") ; View view = inflater.inflate(R.layout.preview_player, container, false) ; relativeLayout = (RelativeLayout) getActivity().findViewById(R.id.splash); ChangeBackground = (ImageButton) view.findViewById(R.id.ChangeBackground); ChangeBackground.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Activity activity = getActivity(); Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(intent, 1); } }); } @SuppressLint("NewApi") @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub if(resultCode == Activity.RESULT_OK) { Context context = getActivity(); Uri uri = data.getData(); ContentResolver cr = context.getContentResolver(); try { Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri)); BitmapDrawable background = new BitmapDrawable(bitmap); relativeLayout.setBackground(background); } catch (FileNotFoundException e) { // TODO: handle exception } } super.onActivityResult(requestCode, resultCode, data); } } </code></pre> <p>But it crash , and the error log is like the following:</p> <pre><code>D/AndroidRuntime(29590): Shutting down VM W/dalvikvm(29590): threadid=1: thread exiting with uncaught exception (group=0x416cc450) --------- beginning of /dev/log/system E/AndroidRuntime(29590): FATAL EXCEPTION: main E/AndroidRuntime(29590): java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=1, result=-1, data=Intent { dat=content://media/external/images/media/23878 }} to activity {tw.com.a_i_t.IPCamViewer/tw.com.a_i_t.IPCamViewer.MainActivity}: java.lang.NullPointerException E/AndroidRuntime(29590): at android.app.ActivityThread.deliverResults(ActivityThread.java:3161) E/AndroidRuntime(29590): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3204) E/AndroidRuntime(29590): at android.app.ActivityThread.access$1100(ActivityThread.java:137) E/AndroidRuntime(29590): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1254) E/AndroidRuntime(29590): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime(29590): at android.os.Looper.loop(Looper.java:213) E/AndroidRuntime(29590): at android.app.ActivityThread.main(ActivityThread.java:4786) E/AndroidRuntime(29590): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(29590): at java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime(29590): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) E/AndroidRuntime(29590): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) E/AndroidRuntime(29590): at dalvik.system.NativeStart.main(Native Method) E/AndroidRuntime(29590): Caused by: java.lang.NullPointerException E/AndroidRuntime(29590): at tw.com.a_i_t.IPCamViewer.Viewer.MjpegPlayerFragment.onActivityResult(MjpegPlayerFragment.java:1627) E/AndroidRuntime(29590): at android.app.Activity.dispatchActivityResult(Activity.java:5196) E/AndroidRuntime(29590): at android.app.ActivityThread.deliverResults(ActivityThread.java:3157) E/AndroidRuntime(29590): ... 11 more W/ActivityManager( 568): Force finishing activity tw.com.a_i_t.IPCamViewer/.MainActivity W/ActivityManager( 568): Activity pause timeout for ActivityRecord{42260630 tw.com.a_i_t.IPCamViewer/.MainActivity} </code></pre> <p>And the <code>(MjpegPlayerFragment.java:1627)</code> is <code>relativeLayout.setBackground(background);</code></p> <p>Does someone can teach me how to solve this problem ? Thanks in abvance. </p> <p>----------------------------------------------EDIT------------------------------ Sorry , The above is not clear. </p> <p>I already add init the <code>relativeLayout</code> in <code>onCreatView</code> like the following:</p> <pre><code>relativeLayout = (RelativeLayout) getActivity().findViewById(R.id.splash); </code></pre> <p>And My scenario is:</p> <p>Activity1 --> Activity1 --> Fragment </p> <p>The splash is the RelativeLayout of Activity1.</p> <p>I want to change the background of Activity1 in Fragment.</p> <p>And the XML of Splash is like the following:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/splash" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/wifi_dvr" &gt; &lt;ImageView android:id="@+id/image" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/title" android:src="@drawable/ic_launcher" /&gt; &lt;ImageView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="146dp" android:src="@drawable/banner" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>I have two activity. The fragment is call by activity2 , and I want to change the background of activity1.</p>
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    1. CO`relativeLayout` is not initialized
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      1. POHow to change the background of activity in fragment?
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    2. COI have define private RelativeLayout relativeLayout; in the head of code.
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    3. COthat is just a declaration not initialization
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      1. POHow to change the background of activity in fragment?
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