如何改变片段的活动背景? [英] How to change the background of activity in fragment?
问题描述
我想更改片段中活动的背景.
I want to change the background of activity in fragment.
当我单击Fragment中的按钮时，它将选择图片.
并将图片设置为活动的背景.
When I click the button in the Fragment , it choose the picture.
And set the picture to the background of Activity.
以下代码在Fragment中:
The following code is in Fragment:
public class MjpegPlayerFragment extends Fragment {
private RelativeLayout relativeLayout;
public View onCreateView(LayoutInflater充气机，ViewGroup容器，捆绑的saveInstanceState){
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
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);
}
}
但是它崩溃了，并且错误日志如下:
But it crash , and the error log is like the following:
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}
(MjpegPlayerFragment.java:1627)是relativeLayout.setBackground(background);
有人可以教我如何解决这个问题吗? 谢谢你.
Does someone can teach me how to solve this problem ? Thanks in abvance.
----------------------------------------------编辑------------------------------ 抱歉，以上内容不清楚.
----------------------------------------------EDIT------------------------------ Sorry , The above is not clear.
我已经在onCreatView中添加了relativeLayout的初始化，如下所示:
I already add init the relativeLayout in onCreatView like the following:
relativeLayout = (RelativeLayout) getActivity().findViewById(R.id.splash);
我的情况是:
Activity1-> Activity1->片段
Activity1 --> Activity1 --> Fragment
启动画面是Activity1的RelativeLayout.
The splash is the RelativeLayout of Activity1.
我想在Fragment中更改Activity1的背景.
I want to change the background of Activity1 in Fragment.
Splash的XML如下:
And the XML of Splash is like the following:
<?xml version="1.0" encoding="utf-8"?>
<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" >
<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" />
<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" />
</RelativeLayout>
我有两个活动.该片段由activity2调用，我想更改activity1的背景.
I have two activity. The fragment is call by activity2 , and I want to change the background of activity1.
推荐答案
relativeLayout未初始化.是未初始化还是初始化失败.
relativeLayout is not initialized. Either is it not initialized or the initialization fails.
relativeLayout = (RelativeLayout)getActivity().findViewById(R.id.relativelayout);
在片段类的onActivityCreated中.
或在Activity类中初始化relativeLayout.使用界面作为活动的回调，并更改活动本身的背景
Or Initialize relativeLayout in Activity class. Use a interface as a callback to the activity and change the background in activity itself
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