android.graphics.BitmapFactory#decodeFileDescriptor ( )源码实例Demo

下面列出了android.graphics.BitmapFactory#decodeFileDescriptor ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： android-open-project-demo 文件： BitmapDecoder.java


public static Bitmap decodeSampledBitmapFromDescriptor(FileDescriptor fileDescriptor, BitmapSize maxSize, Bitmap.Config config) {
    synchronized (lock) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true; // 只读头信息
        options.inPurgeable = true;
        options.inInputShareable = true;
        BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
        //这个就是图片压缩倍数的参数
        options.inSampleSize = calculateInSampleSize(options, maxSize.getWidth(), maxSize.getHeight());
        options.inJustDecodeBounds = false;
        if (config != null) {
            options.inPreferredConfig = config;
        }
        try {
            return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
        } catch (Throwable e) {
            LogUtils.e(e.getMessage(), e);
            return null;
        }
    }
}

源代码2 项目： BubbleCloudView 文件： ImageResizer.java


/**
 * Decode and sample down a bitmap from a file input stream to the requested width and height.
 *
 * @param fileDescriptor The file descriptor to read from
 * @param reqWidth The requested width of the resulting bitmap
 * @param reqHeight The requested height of the resulting bitmap
 * @param cache The ImageCache used to find candidate bitmaps for use with inBitmap
 * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
 *         that are equal to or greater than the requested width and height
 */
public static Bitmap decodeSampledBitmapFromDescriptor(
        FileDescriptor fileDescriptor, int reqWidth, int reqHeight, ImageCache cache) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;

    // If we're running on Honeycomb or newer, try to use inBitmap
    if (Utils.hasHoneycomb()) {
        addInBitmapOptions(options, cache);
    }

    return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
}

源代码3 项目： libcommon 文件： BitmapHelper.java


/**
 * ファイルからビットマップを読み込んで指定した幅・高さに最も近い大きさのBitmapとして返す
 * @param fd
 * @param requestWidth
 * @param requestHeight
 * @return
 */
@Nullable
public static Bitmap asBitmap(
	final FileDescriptor fd,
	final int requestWidth, final int requestHeight) {

	Bitmap bitmap = null;
	if (fd != null && fd.valid()) {
		final BitmapFactory.Options options = new BitmapFactory.Options();
		options.inJustDecodeBounds = true;	// Bitmapを生成せずにサイズ等の情報だけを取得する
		BitmapFactory.decodeFileDescriptor(fd, null, options);
		options.inJustDecodeBounds = false;
		options.inSampleSize = calcSampleSize(options, requestWidth, requestHeight);
		bitmap = BitmapFactory.decodeFileDescriptor(fd, null, options);
		final int orientation = getOrientation(fd);
		if (orientation != 0) {
			final Bitmap newBitmap = rotateBitmap(bitmap, orientation);
			bitmap.recycle();
			bitmap = newBitmap;
		}
	}
	return bitmap;
}

源代码4 项目： memoir 文件： BitmapManager.java


/**
 * The real place to delegate bitmap decoding to BitmapFactory.
 */
public Bitmap decodeFileDescriptor(FileDescriptor fd, BitmapFactory.Options options) {
    if (options.mCancel) {
        return null;
    }

    Thread thread = Thread.currentThread();
    if (!canThreadDecoding(thread)) {
        return null;
    }

    setDecodingOptions(thread, options);
    Bitmap b = BitmapFactory.decodeFileDescriptor(fd, null, options);

    removeDecodingOptions(thread);
    return b;
}

源代码5 项目： memoir 文件： BitmapManager.java


/**
 * The real place to delegate bitmap decoding to BitmapFactory.
 */
public Bitmap decodeFileDescriptor(FileDescriptor fd, BitmapFactory.Options options) {
    if (options.mCancel) {
        return null;
    }

    Thread thread = Thread.currentThread();
    if (!canThreadDecoding(thread)) {
        return null;
    }

    setDecodingOptions(thread, options);
    Bitmap b = BitmapFactory.decodeFileDescriptor(fd, null, options);

    removeDecodingOptions(thread);
    return b;
}

源代码6 项目： reader 文件： BitmapManager.java


/**
 * The real place to delegate bitmap decoding to BitmapFactory.
 */
public Bitmap decodeFileDescriptor(FileDescriptor fd,
                                   BitmapFactory.Options options) {
    if (options.mCancel) {
        return null;
    }

    Thread thread = Thread.currentThread();
    if (!canThreadDecoding(thread)) {
        Log.d(TAG, "Thread " + thread + " is not allowed to decode.");
        return null;
    }

    setDecodingOptions(thread, options);
    Bitmap b = BitmapFactory.decodeFileDescriptor(fd, null, options);

    removeDecodingOptions(thread);
    return b;
}

源代码7 项目： ListViewVariants 文件： ContactImageUtil.java


public static Bitmap decodeSampledBitmapFromDescriptor(
  FileDescriptor fileDescriptor,int reqWidth,int reqHeight)
{

// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options=new BitmapFactory.Options();
options.inJustDecodeBounds=true;
BitmapFactory.decodeFileDescriptor(fileDescriptor,null,options);

// Calculate inSampleSize
options.inSampleSize=calculateInSampleSize(options,reqWidth,reqHeight);

// Decode bitmap with inSampleSize set
options.inJustDecodeBounds=false;
return BitmapFactory.decodeFileDescriptor(fileDescriptor,null,options);
}

源代码8 项目： AlbumCameraRecorder 文件： BitmapUtils.java


/**
 * Decode and sample down a bitmap from a file input stream to the requested width and height.
 *
 * @param fileDescriptor The file descriptor to read from
 * @param reqWidth       The requested width of the resulting bitmap
 * @param reqHeight      The requested height of the resulting bitmap
 * @return A bitmap sampled down from the original with the same aspect ratio and dimensions
 * that are equal to or greater than the requested width and height
 */
public static Bitmap decodeBitmapFromDescriptor(FileDescriptor fileDescriptor, int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;

    return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
}

源代码9 项目： QuickerAndroid 文件： ImagePicker.java


private static Bitmap decodeBitmap(Context context, Uri theUri, int sampleSize) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = sampleSize;

    AssetFileDescriptor fileDescriptor = null;
    try {
        fileDescriptor = context.getContentResolver().openAssetFileDescriptor(theUri, "r");
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    Bitmap actuallyUsableBitmap = BitmapFactory.decodeFileDescriptor(
            fileDescriptor.getFileDescriptor(), null, options);

    Log.d(TAG, options.inSampleSize + " sample method bitmap ... " +
            actuallyUsableBitmap.getWidth() + " " + actuallyUsableBitmap.getHeight());

    return actuallyUsableBitmap;
}

源代码10 项目： ClassSchedule 文件： ImageResizer.java


/**
 * 压缩加载图片 从文件<br>
 */
public static Bitmap decodeSampledBitmapFromDescriptor(FileDescriptor descriptor, int reqWidth, int reqHeight) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFileDescriptor(descriptor, null, options);
    int inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    options.inSampleSize = inSampleSize;
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeFileDescriptor(descriptor, null, options);
}

源代码11 项目： Android-Basics-Codes 文件： BitmapDecoder.java


public static Bitmap decodeSampledBitmapFromDescriptor(FileDescriptor fileDescriptor, int reqWidth, int reqHeight) {

        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        options.inPurgeable = true;
        BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
        options.inJustDecodeBounds = false;
        try {
        	 return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
		} catch (OutOfMemoryError e) {
			 e.printStackTrace();
			 return null;
		}
    }

源代码12 项目： DevUtils 文件： ImageUtils.java


/**
 * 获取 Bitmap
 * @param fd      文件描述
 * @param options {@link BitmapFactory.Options}
 * @return {@link Bitmap}
 */
public static Bitmap decodeFileDescriptor(final FileDescriptor fd, final BitmapFactory.Options options) {
    if (fd == null) return null;
    try {
        return BitmapFactory.decodeFileDescriptor(fd, null, options);
    } catch (Exception e) {
        LogPrintUtils.eTag(TAG, e, "decodeFileDescriptor");
        return null;
    }
}

源代码13 项目： DevUtils 文件： ImageUtils.java


/**
 * 获取 Bitmap
 * @param fd        文件描述
 * @param maxWidth  最大宽度
 * @param maxHeight 最大高度
 * @return {@link Bitmap}
 */
public static Bitmap getBitmap(final FileDescriptor fd, final int maxWidth, final int maxHeight) {
    if (fd == null) return null;
    try {
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFileDescriptor(fd, null, options);
        options.inSampleSize = BitmapUtils.calculateInSampleSize(options, maxWidth, maxHeight);
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFileDescriptor(fd, null, options);
    } catch (Exception e) {
        LogPrintUtils.eTag(TAG, e, "getBitmap");
        return null;
    }
}

源代码14 项目： Onosendai 文件： ImageMetadata.java


private void readDimentions () throws IOException {
	synchronized (this.bitmapLock) {
		final Options opts = new Options();
		opts.inJustDecodeBounds = true;
		BitmapFactory.decodeFileDescriptor(openFileDescriptor().getFileDescriptor(), null, opts);
		this.cachedWidth = opts.outWidth;
		this.cachedHeight = opts.outHeight;
	}
}

源代码15 项目： Shelter 文件： Utility.java


public static Bitmap decodeSampledBitmap(FileDescriptor fd,
                                         int reqWidth, int reqHeight) {
    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFileDescriptor(fd, null, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeFileDescriptor(fd, null, options);
}

源代码16 项目： QuickerAndroid 文件： ImagePicker.java


public static int calculateInSampleSize(Context context, Uri selectedImage, int reqWidth, int reqHeight) {
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;

    AssetFileDescriptor fileDescriptor = null;
    try {
        fileDescriptor = context.getContentResolver().openAssetFileDescriptor(selectedImage, "r");
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    BitmapFactory.decodeFileDescriptor(
            fileDescriptor.getFileDescriptor(), null, options);

    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;
    if (height > reqHeight || width > reqWidth) {

        final int halfHeght = height / 2;
        final int halfWidth = width / 2;

        while ((halfHeght / inSampleSize) >= reqHeight && (halfWidth / inSampleSize) >= reqWidth) {
            inSampleSize *= 2;
        }

    }
    return inSampleSize;
}

源代码17 项目： 365browser 文件： BitmapUtils.java


/**
 * Given a FileDescriptor, decodes the contents and returns a bitmap of
 * dimensions |size|x|size|.
 * @param descriptor The FileDescriptor for the file to read.
 * @param size The width and height of the bitmap to return.
 * @return The resulting bitmap.
 */
public static Bitmap decodeBitmapFromFileDescriptor(FileDescriptor descriptor, int size) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFileDescriptor(descriptor, null, options);
    options.inSampleSize = calculateInSampleSize(options.outWidth, options.outHeight, size);
    options.inJustDecodeBounds = false;
    Bitmap bitmap = BitmapFactory.decodeFileDescriptor(descriptor, null, options);

    if (bitmap == null) return null;

    return sizeBitmap(bitmap, size);
}

源代码18 项目： android-open-project-demo 文件： BitmapDecoder.java


public static Bitmap decodeFileDescriptor(FileDescriptor fileDescriptor) {
    synchronized (lock) {
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPurgeable = true;
        options.inInputShareable = true;
        try {
            return BitmapFactory.decodeFileDescriptor(fileDescriptor, null, options);
        } catch (Throwable e) {
            LogUtils.e(e.getMessage(), e);
            return null;
        }
    }
}

源代码19 项目： TvLauncher 文件： BitmapUtil.java


/**
 * get Bitmap
 *
 * @param imgFile
 * @param minSideLength
 * @param maxNumOfPixels
 * @return
 */
public static Bitmap tryGetBitmap(String imgFile, int minSideLength, int maxNumOfPixels) {
    if (imgFile == null || imgFile.length() == 0)
        return null;

    try {
        FileInputStream fi = new FileInputStream(imgFile);
        FileDescriptor fd = fi.getFD();
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;

        BitmapFactory.decodeFileDescriptor(fd, null, options);

        options.inSampleSize = computeSampleSize(options, minSideLength, maxNumOfPixels);
        try {
            // 这里一定要将其设置回false，因为之前我们将其设置成了true
            // 设置inJustDecodeBounds为true后，decodeFile并不分配空间，即，BitmapFactory解码出来的Bitmap为Null,但可计算出原始图片的长度和宽度
            options.inJustDecodeBounds = false;

            Bitmap bmp = BitmapFactory.decodeFile(imgFile, options);
            fi.close();
            return bmp == null ? null : bmp;
        } catch (OutOfMemoryError err) {
            System.gc();
            System.runFinalization();
            return null;
        }
    } catch (Exception e) {
        return null;
    }
}

源代码20 项目： FastAndroid 文件： BitmapUtils.java


/**
 * 获取 bitmap
 *
 * @param fd 文件描述
 * @return bitmap
 */
public static Bitmap getBitmap(final FileDescriptor fd) {
    if (fd == null) return null;
    return BitmapFactory.decodeFileDescriptor(fd);
}

方法所在类

android.graphics.BitmapFactory