如何在android中保存图像格式名称+后缀的图像

Question

我是Android，Eclipse和Java的新手。我仍在开发从相册中选择图像的应用程序，使用BitmapFactory将其存储在位图中，处理位图，并将处理后的值保存到新的图像文件中。 我想要的名称格式是nameoforiginalimage + _embed + .png

这是我的代码： 首先，我初始化我需要的变量：

public static final int PICK_IMAGE = 1;
private Bitmap sourceBitmap;
private String picturePath;

其次，我是通过意图调用相册：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_embed);

    final Intent photoPickerIntent = new Intent (Intent.ACTION_PICK);

    Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadImage);
    buttonLoadImage.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg) {
            photoPickerIntent.setType("image/*.png");
            startActivityForResult(photoPickerIntent, PICK_IMAGE);
        }
    });
}

第三，我通过onActivityResult

将我选择的图像放入Bitmap

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    Uri photoUri = data.getData();

    switch(requestCode) {

    case(PICK_IMAGE) :
        if (resultCode == RESULT_OK) {
            if (photoUri != null) {
                try {
                    Cursor cursor = getContentResolver().query(photoUri, null, null, null, null);
                    cursor.moveToFirst();

                    int indexColumn = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
                    picturePath = cursor.getString(indexColumn);

                    BitmapFactory.Options opt = new BitmapFactory.Options();
                    opt.inDither = false;
                    opt.inScaled = false;
                    opt.inDensity = 0;
                    opt.inJustDecodeBounds = false;
                    opt.inPurgeable = false;
                    opt.inSampleSize = 1;
                    opt.inScreenDensity = 0;
                    opt.inTargetDensity = 0;

                    sourceBitmap = BitmapFactory.decodeFile(picturePath);
                    ImageView hostImageView = (ImageView) findViewById(R.id.viewHost);
                    hostImageView.setImageBitmap(sourceBitmap);

                } catch (Exception e) {
                    e.printStackTrace();}

            }
        }
        break;
}

最后，处理Bitmap，保存到新的图像文件，并在此代码中显示到imageView：

Button buttonProceed = (Button) findViewById(R.id.buttonProceed);
    buttonProceed.setOnClickListener (new View.OnClickListener() {

        @Override
        public void onClick(View arg) {

            int maxHeight = sourceBitmap.getHeight();
            int maxWidth = sourceBitmap.getWidth();
            int density = sourceBitmap.getDensity();

            int processArray[];
            Bitmap onProcessBitmap = sourceBitmap.copy(Bitmap.Config.ARGB_8888, true);

            processArray = new int[maxHeight * maxWidth];
            onProcessBitmap.getPixels(processArray, 0, maxWidth, 0, 0, maxWidth, maxHeight);

            // the process going in there
            for (int i = 0; i < processArray.length; i++) {
                processArray[i] = processArray[i] / 2;
            }

            onProcessBitmap = Bitmap.createBitmap(maxWidth, maxHeight, Bitmap.Config.ARGB_8888);
            onProcessBitmap.setDensity(density);
            int masterIndex = 0;

            for (int j = 0; j < maxHeight; j++) {
                for (int i = 0; i < maxWidth; i++) {
                    onProcessBitmap.setPixel(i, j, Color.argb(0xFF, 
                            processArray[masterIndex] >> 16 & 0xFF, 
                            processArray[masterIndex] >> 8 & 0xFF, 
                            processArray[masterIndex++] & 0xFF));
                }
            }

            //saving sequence going in there
            Uri result = null;
            String sdcardState = android.os.Environment.getExternalStorageState();
            String destPath = null;
            int indexSeparator = picturePath.lastIndexOf(File.separator);
            int indexPoint = picturePath.lastIndexOf(".");

            if (indexPoint < 1){
                indexPoint = picturePath.length();
            }

            String fileNameDest = picturePath.substring(indexSeparator + 1, indexPoint);
            fileNameDest += "_embed";

            if (sdcardState.contentEquals(android.os.Environment.MEDIA_MOUNTED)) {
                destPath = android.os.Environment.getExternalStorageDirectory() + File.separator + fileNameDest + ".png";
            }

            OutputStream fileOut = null;
            try {
                fileOut = new FileOutputStream(destPath);
                onProcessBitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOut);
                result = Uri.parse("file://" + destPath);
                sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, result));
                fileOut.flush();
                fileOut.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            ImageView resultImageView = (ImageView) findViewById(R.id.resultImageView);
            resultImageView.setImageBitmap(onProcessBitmap);

        }
    });
}

到目前为止，我已成功将其保存到新的图像文件，但图像文件名保存为“_embed.png”，而不是“NameOfOriginalImage_embed.png”。

请有人帮助我，我的代码有什么问题？

（有关其他信息，如果它可以帮助解决问题。我开发这个 最低要求SDK = API 8 2.2 Froyo 目标SDK＆amp; Compile = API 17 4.2 Jelly Bean）

问候！