在片段错误图片廊 [英] Image Gallery in Fragment Error
问题描述
我试图与它片段内的图片库的应用程序,但在code没有得到错误,但低于收到此错误。任何帮助将是真棒,只是一个初学者。如果你希望的任何更多的细节就问我。
认为它是与第34行是:GridView控件的GridView =(GridView控件)getView()findViewById(R.id.gridview);
code:
公共类Fragment_3扩展片段{
私有静态视图视图;
@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,捆绑savedInstanceState){
如果(查看!= NULL){
ViewGroup中父=(ViewGroup中)view.getParent();
如果(父!= NULL)
parent.removeView(视图);
}
尝试{
鉴于= inflater.inflate(R.layout.fragment_3,集装箱,FALSE);
}赶上(InflateException E){
} GridView控件的GridView =(GridView控件)getView()findViewById(R.id.gridview)。
gridview.setAdapter(新ImageAdapter(this.getActivity())); gridview.setOnItemClickListener(新OnItemClickListener(){
公共无效onItemClick(适配器视图<>母公司,视图V,INT位置,长的id){
Toast.makeText(Fragment_3.this.getActivity(),+位置,Toast.LENGTH_SHORT).show();
}
}); 返回视图。
} 公共类ImageAdapter延伸BaseAdapter {
私人语境mContext; 公共ImageAdapter(上下文C){
mContext = C;
} 公众诠释的getCount(){
返回mThumbIds.length;
} 公共对象的getItem(INT位置){
返回null;
} 众长getItemId(INT位置){
返回0;
} //创建由适配器引用的每个项目的新的ImageView
公共查看getView(INT位置,查看convertView,父母的ViewGroup){
ImageView的ImageView的;
如果(convertView == NULL){//如果它没有回收,初始化一些属性
ImageView的=新ImageView的(mContext);
imageView.setLayoutParams(新GridView.LayoutParams(85,85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8,8,8,8);
}其他{
ImageView的=(ImageView的)convertView;
} imageView.setImageResource(mThumbIds [位置]);
返回ImageView的;
} //我们的图像的引用
私人整数[] = mThumbIds {
R.drawable.sample_2,R.drawable.sample_3,
R.drawable.sample_4,R.drawable.sample_5,
R.drawable.sample_6,R.drawable.sample_7,
R.drawable.sample_0,R.drawable.sample_1,
R.drawable.sample_2,R.drawable.sample_3,
R.drawable.sample_4,R.drawable.sample_5,
R.drawable.sample_6,R.drawable.sample_7,
R.drawable.sample_0,R.drawable.sample_1,
R.drawable.sample_2,R.drawable.sample_3,
R.drawable.sample_4,R.drawable.sample_5,
R.drawable.sample_6,R.drawable.sample_7
};
}
}
错误
06-24 14:02:27.385:E / AndroidRuntime(3959):致命异常:主要
06-24 14:02:27.385:E / AndroidRuntime(3959):显示java.lang.NullPointerException
06-24 14:02:27.385:E / AndroidRuntime(3959):在com.bottlecapp.ahmetmikko.Fragment_3.onCreateView(Fragment_3.java:34)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.support.v4.app.FragmentManagerImpl $ 1.run(FragmentManager.java:429)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.os.Handler.handleCallback(Handler.java:725)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.os.Handler.dispatchMessage(Handler.java:92)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.os.Looper.loop(Looper.java:137)
06-24 14:02:27.385:E / AndroidRuntime(3959):在android.app.ActivityThread.main(ActivityThread.java:5041)
06-24 14:02:27.385:E / AndroidRuntime(3959):在java.lang.reflect.Method.invokeNative(本机方法)
06-24 14:02:27.385:E / AndroidRuntime(3959):在java.lang.reflect.Method.invoke(Method.java:511)
06-24 14:02:27.385:E / AndroidRuntime(3959):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:793)
06-24 14:02:27.385:E / AndroidRuntime(3959):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-24 14:02:27.385:E / AndroidRuntime(3959):在dalvik.system.NativeStart.main(本机方法)
有一个原因,你有你的onCreate导致返回查看
A try catch块?语法明智的,你不需要 getView()
在 GridView控件
,你可以做 GridView控件的GridView =(GridView控件)findViewById(R.id.gridview);
但它看起来像你得到一个NullPointerException异常。你可以让我们知道34是什么线?
I'm trying to make an app with an image gallery in it inside a fragment, but not getting errors in the code but getting this error below. Any help would be awesome, only a beginner. If you wish any more details just ask.
Think its something to do with the 34th line which is: GridView gridview = (GridView) getView().findViewById(R.id.gridview);
Code:
public class Fragment_3 extends Fragment{
private static View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null)
parent.removeView(view);
}
try {
view = inflater.inflate(R.layout.fragment_3, container, false);
} catch (InflateException e) {
}
GridView gridview = (GridView) getView().findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this.getActivity()));
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
Toast.makeText(Fragment_3.this.getActivity(), "" + position, Toast.LENGTH_SHORT).show();
}
});
return view;
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
// references to our images
private Integer[] mThumbIds = {
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7,
R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7,
R.drawable.sample_0, R.drawable.sample_1,
R.drawable.sample_2, R.drawable.sample_3,
R.drawable.sample_4, R.drawable.sample_5,
R.drawable.sample_6, R.drawable.sample_7
};
}
}
Error
06-24 14:02:27.385: E/AndroidRuntime(3959): FATAL EXCEPTION: main
06-24 14:02:27.385: E/AndroidRuntime(3959): java.lang.NullPointerException
06-24 14:02:27.385: E/AndroidRuntime(3959): at com.bottlecapp.ahmetmikko.Fragment_3.onCreateView(Fragment_3.java:34)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.os.Handler.handleCallback(Handler.java:725)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.os.Handler.dispatchMessage(Handler.java:92)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.os.Looper.loop(Looper.java:137)
06-24 14:02:27.385: E/AndroidRuntime(3959): at android.app.ActivityThread.main(ActivityThread.java:5041)
06-24 14:02:27.385: E/AndroidRuntime(3959): at java.lang.reflect.Method.invokeNative(Native Method)
06-24 14:02:27.385: E/AndroidRuntime(3959): at java.lang.reflect.Method.invoke(Method.java:511)
06-24 14:02:27.385: E/AndroidRuntime(3959): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-24 14:02:27.385: E/AndroidRuntime(3959): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-24 14:02:27.385: E/AndroidRuntime(3959): at dalvik.system.NativeStart.main(Native Method)
Is there a reason why you have a try catch block on your onCreate resulting in returning a View
? Syntax wise you don't need getView()
on your GridView
, you can just do GridView gridview = (GridView) findViewById(R.id.gridview);
But it looks like you are getting a NullPointerException. Can you let us know what line 34 is?
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