图片无法在网格中显示BitmapFactory.decodefile：无法解码流：java.lang.NullPointerException？

（还有12个同样的问题是这样问的，但没有人回答我的问题。由于它属于代码异常并不是每个重复的问题都有同样的问题）。图片无法在网格中显示BitmapFactory.decodefile：无法解码流：java.lang.NullPointerException？

我想从我创建的绘图应用程序中的自定义文件夹中提取图像。它已经获得了所有的文件并获取了custom_adapter中的所有图像，但是当我使用位图解码时，它会抛出错误Unable to decode stream: java.lang.NullPointerException。

下面是代码：

MainActivity.class

Custom_Adapter.class

public class Custom_grid extends BaseAdapter { 

    String [] result; 
    private static LayoutInflater inflater=null; 
    Context context; 

    public Custom_grid(Grid_Collection grid_collection,String [] file) { 
     result= file; 
     context = grid_collection; 
     inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 


    @Override 
    public int getCount() { 
//  Log.e("LIST SIZE", "" + result.length); 
     return result.length; 
    } 

    @Override 
    public Object getItem(int position) { 
     return position; 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    class Holder{ 
     ImageView iv; 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) { 
     Holder holder; 
     View vi=convertView; 

     if(convertView == null){ 

      vi = inflater.inflate(R.layout.imageview,null); 

      holder = new Holder(); 

      holder.iv= (ImageView)vi.findViewById(R.id.image); 

      vi.setTag(holder); 
     } 
     else { 
      holder = (Holder) vi.getTag(); 
     } 

     Log.e("LIST POSITION", "" + result[position]); 
     Bitmap bmp = BitmapFactory.decodeFile(result[position]); 

     holder.iv.setImageBitmap(bmp); 



    return vi; 
    } 

    @Override 
    public int getItemViewType(int position) { 
     return 0; 
    } 

    @Override 
    public int getViewTypeCount() { 
     return 1; 
    } 

    @Override 
    public boolean isEmpty() { 
     return false; 
    } 
}

为什么它显示错误？代码都可以。

的logcat ::

10-17 13:59:38.852 19817-19817/com.example.dell.drawdemo D/AbsListView: checkAbsListViewlLogProperty get invalid command 
10-17 13:59:38.853 19817-19817/com.example.dell.drawdemo D/Files: Path: /storage/emulated/0/Drawing App 
10-17 13:59:38.862 19817-19817/com.example.dell.drawdemo D/Files: Size: 13 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:984f456b-91ee-4cd7-893e-faeb44fcc1c1.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:79fdc1fa-c5bb-4e88-aa26-94563b0d72bd.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:a4537e3d-c708-45e5-82fd-8c43e48878d3.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:cdaa2564-6db0-4b77-ad33-c06eb37978a2.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:41d782a1-7682-4e69-a0e3-7bf3adc9dc3f.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:bd06264a-d91e-43b2-b17b-e7d2746642cc.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:d1fcb76f-c90b-44ac-98f2-03d0dd255532.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:86c8f75d-4532-4100-b239-e3e67fe45dec.png 
10-17 13:59:38.863 19817-19817/com.example.dell.drawdemo D/Files: FileName:811e7856-0dc7-4a5a-ac4c-371f39d5a16f.png 
10-17 13:59:38.864 19817-19817/com.example.dell.drawdemo D/Files: FileName:48c634e3-a3d0-43d6-9387-9ce3dba7c874.png 
10-17 13:59:38.864 19817-19817/com.example.dell.drawdemo D/Files: FileName:6057691d-f96e-4554-921e-316cda99b034.png 
10-17 13:59:38.864 19817-19817/com.example.dell.drawdemo D/Files: FileName:1c7674be-860c-4e76-a5bb-21648bd3d9ea.png 
10-17 13:59:38.864 19817-19817/com.example.dell.drawdemo D/Files: FileName:3665b64a-e2eb-4d81-ab62-d40ab0cc74ac.png 
10-17 13:59:38.865 19817-19817/com.example.dell.drawdemo D/ActivityThread: ACT-AM_ON_RESUME_CALLED ActivityRecord{42434500 [email protected] {com.example.dell.drawdemo/com.example.dell.drawdemo.Grid_Collection}} 
10-17 13:59:38.865 19817-19817/com.example.dell.drawdemo V/PhoneWindow: DecorView setVisiblity: visibility = 4 ,Parent =null, this =com.android.internal.policy.impl.PhoneWindow$DecorView{42435aa0 I.E..... R.....ID 0,0-0,0} 
10-17 13:59:38.870 19817-19817/com.example.dell.drawdemo V/PhoneWindow: DecorView setVisiblity: visibility = 0 ,Parent =ViewRoot{42456a48 com.example.dell.drawdemo/com.example.dell.drawdemo.Grid_Collection,ident = 1}, this =com.android.internal.policy.impl.PhoneWindow$DecorView{42435aa0 V.E..... R.....ID 0,0-0,0} 
10-17 13:59:38.872 19817-19817/com.example.dell.drawdemo D/ActivityThread: ACT-LAUNCH_ACTIVITY handled : 0/ActivityRecord{42434500 [email protected] {com.example.dell.drawdemo/com.example.dell.drawdemo.Grid_Collection}} 
10-17 13:59:38.891 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.893 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.927 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: create handle(0x62a76d68) (w:544, h:960, f:1) 
10-17 13:59:38.928 19817-19817/com.example.dell.drawdemo I/MaliEGL: [Mali]window_type=1, is_framebuffer=0, errnum = 0 
10-17 13:59:38.928 19817-19817/com.example.dell.drawdemo I/MaliEGL: [Mali]surface->num_buffers=4, surface->num_frames=3, win_min_undequeued=1 
10-17 13:59:38.928 19817-19817/com.example.dell.drawdemo I/MaliEGL: [Mali]max_allowed_dequeued_buffers=3 
10-17 13:59:38.929 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: close handle(0x62a76d68) (w:544 h:960 f:1) 
10-17 13:59:38.932 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: create handle(0x62a79b68) (w:544, h:960, f:1) 
10-17 13:59:38.934 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: setViewport 540x960 <0x62a79cf0> 
10-17 13:59:38.935 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.935 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.938 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.938 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.941 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.941 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.944 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.944 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.947 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.948 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.951 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.951 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.954 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.954 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.957 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.957 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.960 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.960 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.963 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.963 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.966 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.966 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.969 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.969 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.972 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.972 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.976 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:38.976 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:38.985 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:38.985 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:38.989 19817-19817/com.example.dell.drawdemo D/AbsListView: onWindowFocusChanged: hasWindowFocus=true, this=android.widget.GridView{42439dc8 VFED.VC. .F....I. 0,0-540,922 #7f0c0067 app:id/grid} 
10-17 13:59:38.990 19817-19817/com.example.dell.drawdemo V/InputMethodManager: onWindowFocus: android.widget.GridView{42439dc8 VFED.VC. .F....I. 0,0-540,922 #7f0c0067 app:id/grid} softInputMode=272 first=true flags=#1810100 
10-17 13:59:38.990 19817-19817/com.example.dell.drawdemo V/InputMethodManager: START INPUT: android.widget.GridView{42439dc8 VFED.VC. .F....I. 0,0-540,922 #7f0c0067 app:id/grid} ic=null [email protected] controlFlags=#105 
10-17 13:59:39.002 19817-19817/com.example.dell.drawdemo E/LIST POSITION: null 
10-17 13:59:39.002 19817-19817/com.example.dell.drawdemo E/BitmapFactory: Unable to decode stream: java.lang.NullPointerException 
10-17 13:59:39.008 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: create handle(0x6207c688) (w:544, h:960, f:1) 
10-17 13:59:39.016 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:39.016 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:39.030 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: create handle(0x62f4e0b8) (w:544, h:960, f:1) 
10-17 13:59:39.032 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: Flushing caches (mode 0) 
10-17 13:59:39.033 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: close handle(0x618d6d18) (w:544 h:960 f:1) 
10-17 13:59:39.033 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: close handle(0x5d127550) (w:544 h:960 f:1) 
10-17 13:59:39.034 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: close handle(0x62873990) (w:544 h:960 f:1) 
10-17 13:59:39.034 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: close handle(0x62f4e0b8) (w:544 h:960 f:1) 
10-17 13:59:39.346 19817-19817/com.example.dell.drawdemo V/PhoneWindow: DecorView setVisiblity: visibility = 4 ,Parent =ViewRoot{424234f8 com.example.dell.drawdemo/com.example.dell.drawdemo.MainActivity,ident = 0}, this =com.android.internal.policy.impl.PhoneWindow$DecorView{42316338 I.E..... R....... 0,0-540,960} 
10-17 13:59:39.346 19817-19817/com.example.dell.drawdemo D/ActivityThread: ACT-STOP_ACTIVITY_HIDE handled : 0/[email protected] 
10-17 13:59:40.102 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: create handle(0x5d12efa8) (w:544, h:960, f:1) 
10-17 13:59:40.104 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.105 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.119 19817-19817/com.example.dell.drawdemo D/GraphicBuffer: create handle(0x62f4e0b8) (w:544, h:960, f:1) 
10-17 13:59:40.121 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.122 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.135 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.136 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.152 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.153 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.169 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.169 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.187 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.188 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.201 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.202 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.218 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.218 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.235 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.235 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.251 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.252 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.268 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.269 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.286 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.287 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.301 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.302 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.318 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.318 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.336 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.337 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:40.351 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: prepareDirty (0.00, 0.00, 540.00, 960.00) opaque 1 <0x62a79cf0> 
10-17 13:59:40.351 19817-19817/com.example.dell.drawdemo D/OpenGLRenderer: finish <0x62a79cf0> 
10-17 13:59:54.746 19817-19817/com.example.dell.drawdemo D/ActivityThread: ACT-AM_ON_PAUSE_CALLED ActivityRecord{42434500 [email protected] {com.example.dell.drawdemo/com.example.dell.drawdemo.Grid_Collection}} 
10-17 13:59:54.781 19817-19817/com.example.dell.drawdemo D/ActivityThread: ACT-PAUSE_ACTIVITY handled : 0/[email protected] 
10-17 13:59:54.812 19817-19817/com.example.dell.drawdemo D/ActivityThread: ACT-STOP_ACTIVITY_SHOW handled : 0/[email protected] 
10-17 13:59:55.024 19817-19817/com.example.dell.drawdemo V/InputMethodManager: START INPUT: android.widget.GridView{42439dc8 VFED.VC. .F...... 0,0-540,922 #7f0c0067 app:id/grid} ic=null [email protected] controlFlags=#100

来源

2015-10-17 Drashti Kapadia

位置显示为null ..请任何人帮我摆脱这个在这发疯... –

发布您的完整logcat。 – Kunu

LOGCAT张贴检查它请。 - @ Kunu –

也许这将帮助你:)
有了：

文件文件[] = f.listFiles（）;

您会看到您在日志上输出的文件列表。
比你实例FilePathStrings：（但现在它是一个空数组！）

的String [] FilePathStrings =（新的String [file.length]）;

请调用setAdapter（......），然后加入这一行

... 
    for (int i=0; i < file.length; i++){ 
     FilePathStrings[i] = file[i].getAbsolutePath(); 
    } 
    ...

请编辑您的代码，并告诉我，如果这个问题得到了解决。

来源

2015-10-17 08:05:58

非常感谢你......它的显示图像。 - @ Riccardo Leschiutta –

图片无法在网格中显示BitmapFactory.decodefile：无法解码流：java.lang.NullPointerException？

回答

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