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我正在尝试使对话框显示捕获的照片库，但是在此上运行时，gv.setAdapter(new EOrderGalleryAdapter(getApplicationContext(), data));会发生 Null Exception。

是否有任何关于使用默认打开位于外部 SD 卡中的文件的照片的提示或教程 - 图库或其他？

以下是我的代码

        final Dialog dialog = new Dialog(getBaseContext());

        //remove the default title if you want to
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        //here is where we inflate our custom xml containing a gridview
        dialog.setContentView(R.layout.gallery);                    
        String sdCardRootPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).toString()+"/TVB_PV_photo";
        File rootFolder = new File(sdCardRootPath);
        File[] picFiles = rootFolder.listFiles();
        ArrayList<Bitmap> data = new ArrayList<Bitmap>();
        for (File pic:picFiles) {

            //Bitmap b= BitmapFactory.decodeFile(pic.getAbsolutePath());
            Bitmap b =  decodeFile(pic,4);
            data.add(b);
        }
        GridView gv = (GridView) findViewById(R.id.grid_view);




        gv.setAdapter(new EOrderGalleryAdapter(getApplicationContext(), data));
        gv.setOnItemClickListener(new OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> parent, View v,
                    int position, long id) {
                // TODO Auto-generated method stub
                   Toast.makeText(getBaseContext(), 
                            "photo" + (position + 1) + " selected", 
                            Toast.LENGTH_SHORT).show();
            }});

日志猫

    06-21 10:19:50.946: E/AndroidRuntime(3925):     at android.view.View$1.onClick(View.java:3125)
06-21 10:19:50.946: E/AndroidRuntime(3925):     ... 11 more
06-21 10:19:50.946: E/AndroidRuntime(3925): Caused by: java.lang.NullPointerException
06-21 10:19:50.946: E/AndroidRuntime(3925):     at atvpv.test.OrderSystem1.EOSCustPayment.onCreateDialog(EOSCustPayment.java:352)
06-21 10:19:50.946: E/AndroidRuntime(3925):     at android.app.Activity.onCreateDialog(Activity.java:2828)
06-21 10:19:50.946: E/AndroidRuntime(3925):     at android.app.Activity.createDialog(Activity.java:944)
06-21 10:19:50.946: E/AndroidRuntime(3925):     at android.app.Activity.showDialog(Activity.java:2921)
06-21 10:19:50.946: E/AndroidRuntime(3925):     at android.app.Activity.showDialog(Activity.java:2880)
06-21 10:19:50.946: E/AndroidRuntime(3925):     at atvpv.test.OrderSystem1.EOSCustPayment.buttonGallery(EOSCustPayment.java:421)
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1 回答 1

1

我不认为问题是getApplicationContext()。

合理地，空指针应该gv与您调用的一样，gv.setAdapter因此它检测到 gv 为空并引发异常。

于 2013-06-21T05:31:47.447 回答