android-當從gallery中加載圖像時，有空指針異常

當從gallery中加載圖像時，有空指針異常

我用下面的代碼從 Gallery中獲取圖片。給出一個空指針異常並且系統崩潰。我在設備上測試了代碼，只要我在gallery中選擇一個圖像時，系統就崩潰了。哪些地方出錯了呢？

AlertDialog.Builder builder = new AlertDialog.Builder(CreatePod.this);
                        builder.setMessage("Select") .setCancelable(false).setPositiveButton("Gallery", new DialogInterface.OnClickListener() {
                               public void onClick(DialogInterface dialog, int id)                            {
                                   Intent gallIntent=new Intent(Intent.ACTION_GET_CONTENT);
                                    gallIntent.setType("image/*"); 
                                    startActivityForResult(gallIntent, 10);
                               }
                        })

protected  void onActivityResult(int requestCode, int resultCode, Intent data){
     super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
        case 10:
            if (resultCode == Activity.RESULT_OK) {
                 Bundle extras = data.getExtras();
                   Bitmap b = (Bitmap) extras.get("data");
                   imgView.setImageBitmap(b);

                String timestamp = Long.toString(System.currentTimeMillis());
                   MediaStore.Images.Media.insertImage(getContentResolver(), b, timestamp, timestamp);
                HttpResponse httpResponse;
                ByteArrayOutputStream bao = new ByteArrayOutputStream();

            b.compress(Bitmap.CompressFormat.JPEG, 100, bao);

            byte [] ba = bao.toByteArray();
            int f = 0;
            String ba1=Base64.encodeToString(ba, f);

最佳回答：

把下面的代碼

Bitmap b = (Bitmap) extras.get("data");   
imgView.setImageBitmap(b); 

改成

Uri imageUri = data.getData(); 
Bitmap b = MediaStore.Images.Media.getBitmap(this.getContentResolver(), imageUri);
imgView.setImageBitmap(b);

我運行過這段代碼，是好用的。