下面列出了android.graphics.Bitmap.Config#ARGB_8888 ( ) 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。
public static void compressBitmap(Bitmap bit, int quality, String fileName,
boolean optimize) {
Log.d("native", "compress of native");
if (bit.getConfig() != Config.ARGB_8888) {
Bitmap result = null;
result = Bitmap.createBitmap(bit.getWidth(), bit.getHeight(),
Config.ARGB_8888);
Canvas canvas = new Canvas(result);
Rect rect = new Rect(0, 0, bit.getWidth(), bit.getHeight());
canvas.drawBitmap(bit, null, rect, null);
saveBitmap(result, quality, fileName, optimize);
result.recycle();
} else {
saveBitmap(bit, quality, fileName, optimize);
}
}
/**
* conversion methods
*/
public static Config convertTextureColorFormatToBitmapConfig(PLTextureColorFormat colorFormat) {
Config config = Config.ARGB_8888;
switch (colorFormat) {
case PLTextureColorFormatRGB565:
config = Config.RGB_565;
break;
case PLTextureColorFormatRGBA4444:
config = Config.ARGB_4444;
break;
default:
break;
}
return config;
}
/**
* 通过资源id转化成Bitmap
*/
public static Bitmap ReadBitmapById(Context context, int resId) {
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inPreferredConfig = Config.ARGB_8888;
opt.inPurgeable = true;
opt.inInputShareable = true;
InputStream is = context.getResources().openRawResource(resId);
return BitmapFactory.decodeStream(is, null, opt);
}
/**
* Return the byte usage per pixel of a bitmap based on its configuration.
* @param config The bitmap configuration.
* @return The byte usage per pixel.
*/
private static int getBytesPerPixel(Config config) {
if (config == Config.ARGB_8888) {
return 4;
} else if (config == Config.RGB_565) {
return 2;
} else if (config == Config.ARGB_4444) {
return 2;
} else if (config == Config.ALPHA_8) {
return 1;
}
return 1;
}
/**
* 将图片从本地读到内存时,进行压缩 ,即图片从File形式变为Bitmap形式
* 特点: 通过设置采样率, 减少图片的像素, 达到对内存中的Bitmap进行压缩
* @param srcPath
* @return
*/
public static Bitmap compressImageFromFile(String srcPath, float pixWidth, float pixHeight) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;// 只读边,不读内容
Bitmap bitmap = BitmapFactory.decodeFile(srcPath, options);
options.inJustDecodeBounds = false;
int w = options.outWidth;
int h = options.outHeight;
//float pixWidth = 800f;//
//float pixHeight = 480f;//
int scale = 1;
if (w > h && w > pixWidth) {
scale = (int) (options.outWidth / pixWidth);
} else if (w < h && h > pixHeight) {
scale = (int) (options.outHeight / pixHeight);
}
if (scale <= 0)
scale = 1;
options.inSampleSize = scale;// 设置采样率
options.inPreferredConfig = Config.ARGB_8888;// 该模式是默认的,可不设
options.inPurgeable = true;// 同时设置才会有效
options.inInputShareable = true;// 。当系统内存不够时候图片自动被回收
bitmap = BitmapFactory.decodeFile(srcPath, options);
// return compressBmpFromBmp(bitmap);//原来的方法调用了这个方法企图进行二次压缩
// 其实是无效的,大家尽管尝试
return bitmap;
}
/**
* Return the byte usage per pixel of a bitmap based on its configuration.
* @param config The bitmap configuration.
* @return The byte usage per pixel.
*/
private static int getBytesPerPixel(Config config) {
if (config == Config.ARGB_8888) {
return 4;
} else if (config == Config.RGB_565) {
return 2;
} else if (config == Config.ARGB_4444) {
return 2;
} else if (config == Config.ALPHA_8) {
return 1;
}
return 1;
}
/**
* Return the byte usage per pixel of a bitmap based on its configuration.
*
* @param config The bitmap configuration.
* @return The byte usage per pixel.
*/
private static int getBytesPerPixel(Config config) {
if (config == Config.ARGB_8888) {
return 4;
} else if (config == Config.RGB_565) {
return 2;
} else if (config == Config.ARGB_4444) {
return 2;
} else if (config == Config.ALPHA_8) {
return 1;
}
return 1;
}
/**
* Return the byte usage per pixel of a bitmap based on its configuration.
*
* @param config The bitmap configuration.
* @return The byte usage per pixel.
*/
private static int getBytesPerPixel(Config config) {
if (config == Config.ARGB_8888) {
return 4;
} else if (config == Config.RGB_565) {
return 2;
} else if (config == Config.ARGB_4444) {
return 2;
} else if (config == Config.ALPHA_8) {
return 1;
}
return 1;
}
private Bitmap compressImageFromFile(String srcPath) {
BitmapFactory.Options newOpts = new BitmapFactory.Options();
newOpts.inJustDecodeBounds = true;//只读边,不读内容
Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
float hh = 800f;//
float ww = 480f;//
int be = 1;
if (w > h && w > ww) {
be = (int) (newOpts.outWidth / ww);
} else if (w < h && h > hh) {
be = (int) (newOpts.outHeight / hh);
}
if (be <= 0)
be = 1;
newOpts.inSampleSize = be;//设置采样率
newOpts.inPreferredConfig = Config.ARGB_8888;//该模式是默认的,可不设
newOpts.inPurgeable = true;// 同时设置才会有效
newOpts.inInputShareable = true;//。当系统内存不够时候图片自动被回收
bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
// return compressBmpFromBmp(bitmap);//原来的方法调用了这个方法企图进行二次压缩
//其实是无效的,大家尽管尝试
return bitmap;
}
/**
* Starts playing the given animated GIF logo.
*/
public void playAnimatedLogo(BaseGifImage gifImage) {
mLoadingView.hideLoadingUI();
mAnimatedLogoDrawable = new BaseGifDrawable(gifImage, Config.ARGB_8888);
mAnimatedLogoMatrix = new Matrix();
setMatrix(mAnimatedLogoDrawable.getIntrinsicWidth(),
mAnimatedLogoDrawable.getIntrinsicHeight(), mAnimatedLogoMatrix, false);
// Set callback here to ensure #invalidateDrawable() is called.
mAnimatedLogoDrawable.setCallback(this);
mAnimatedLogoDrawable.start();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder ;
if(convertView == null){
convertView = inflater.inflate(R.layout.item_menu_content, parent, false);
viewHolder = new ViewHolder();
viewHolder.iv_image = (ImageView)convertView.findViewById(R.id.item_menu_content_img);
viewHolder.tv_menusName = (TextView)convertView.findViewById(R.id.item_menu_content_title);
viewHolder.tv_price = (TextView)convertView.findViewById(R.id.item_menu_content_price);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder)convertView.getTag();
}
//创建一个RequestQueue对象
RequestQueue requestQueue = Volley.newRequestQueue(context);
//创建ImageRequest对象
ImageRequest imageRequest = new ImageRequest(
Constant.URL_WEB_SERVER+datas.get(position).get("menusImagePath").toString(),//url
new Response.Listener<Bitmap>() {//监听器Listener
@Override
public void onResponse(Bitmap response) {
viewHolder.iv_image.setImageBitmap(response);
}
//参数3、4表示图片宽高,Bitmap.Config.ARGB_8888表示图片每个像素占据4个字节大小
}, 0, 0, Config.ARGB_8888, new Response.ErrorListener() {//图片加载请求失败的回调Listener
@Override
public void onErrorResponse(VolleyError error) {
viewHolder.iv_image.setImageResource(R.drawable.ic_normal_pic);
}
});
//将ImageRequest加载到Queue
requestQueue.add(imageRequest);
viewHolder.tv_menusName.setText(datas.get(position).get("menuName").toString());
viewHolder.tv_price.setText("￥"+datas.get(position).get("total_price").toString());
return convertView;
}
/**
* 按比例缩小图片的像素以达到压缩的目的
*
* @param imgPath
* @return
* @author JPH
* @date 2014-12-5下午11:30:59
*/
private void compressImageByPixel(String imgPath, CompressListener listener) throws FileNotFoundException {
if (imgPath == null) {
sendMsg(false, imgPath, "要压缩的文件不存在", listener);
return;
}
BitmapFactory.Options newOpts = new BitmapFactory.Options();
newOpts.inJustDecodeBounds = true;//只读边,不读内容
BitmapFactory.decodeFile(imgPath, newOpts);
newOpts.inJustDecodeBounds = false;
int width = newOpts.outWidth;
int height = newOpts.outHeight;
float maxSize = config.getMaxPixel();
int be = 1;
if (width >= height && width > maxSize) {//缩放比,用高或者宽其中较大的一个数据进行计算
be = (int) (newOpts.outWidth / maxSize);
be++;
} else if (width < height && height > maxSize) {
be = (int) (newOpts.outHeight / maxSize);
be++;
}
newOpts.inSampleSize = be;//设置采样率
newOpts.inPreferredConfig = Config.ARGB_8888;//该模式是默认的,可不设
newOpts.inPurgeable = true;// 同时设置才会有效
newOpts.inInputShareable = true;//。当系统内存不够时候图片自动被回收
Bitmap bitmap = BitmapFactory.decodeFile(imgPath, newOpts);
if (config.isEnableQualityCompress()) {
compressImageByQuality(bitmap, imgPath, listener);//压缩好比例大小后再进行质量压缩
} else {
File thumbnailFile = getThumbnailFile(new File(imgPath));
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(thumbnailFile));
listener.onCompressSuccess(thumbnailFile.getPath());
}
}
@Override public Resource<Bitmap> decode(Drawable drawable, int width, int height) throws IOException {
Config config = PixelFormat.formatHasAlpha(drawable.getOpacity())? Config.ARGB_8888 : Config.RGB_565;
Bitmap bitmap = pool.get(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), config);
if (bitmap == null) {
bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), config);
}
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return new BitmapResource(bitmap, pool);
}
/**
* Return the byte usage per pixel of a bitmap based on its configuration.
*
* @param config
* The bitmap configuration.
* @return The byte usage per pixel.
*/
private static int getBytesPerPixel(Config config) {
if (config == Config.ARGB_8888) {
return 4;
} else if (config == Config.RGB_565) {
return 2;
} else if (config == Config.ARGB_4444) {
return 2;
} else if (config == Config.ALPHA_8) {
return 1;
}
return 1;
}
/**
* @param resources 传入Resources
* @param resid 资源ID
* @param size 要压缩的大小
* @return
*/
public static Bitmap getSmallBitmap(Resources resources, int resid, int size) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(resources, resid, options);
// Calculate inSampleSize
options.inSampleSize = size;
Log.i("Bitmap", "--" + options.inSampleSize);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
options.inPreferredConfig = Config.ARGB_8888;
Bitmap bitmap = BitmapFactory.decodeResource(resources, resid, options);
if (bitmap == null) {
return null;
}
ByteArrayOutputStream baos = null;
try {
baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
} finally {
try {
if (baos != null) baos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return bitmap;
}
/**
* @param resources 传入Resources
* @param resid 资源ID
* @param width 目标width
* @param height 目标height
* @return
*/
public static Bitmap getSmallBitmap(Resources resources, int resid, int width, int height) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(resources, resid, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, width, height);
Log.i("Bitmap", "--" + options.inSampleSize);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
options.inPreferredConfig = Config.ARGB_8888;
Bitmap bitmap = BitmapFactory.decodeResource(resources, resid, options);
if (bitmap == null) {
return null;
}
ByteArrayOutputStream baos = null;
try {
baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
} finally {
try {
if (baos != null) baos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return bitmap;
}
/**
* Decodes bitmap that keeps aspect-ratio and spans most within the bounds.
*/
private Bitmap decodeBitmap(Uri uri, int width, int height) {
InputStream is = null;
Bitmap bitmap = null;
try {
// TODO: Take max pixels allowed into account for calculation to avoid possible OOM.
Rect bounds = getBitmapBounds(uri);
int sampleSize = Math.max(bounds.width() / width, bounds.height() / height);
sampleSize = Math.min(sampleSize, Math.max(bounds.width() / height, bounds.height() / width));
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = Math.max(sampleSize, 1);
options.inPreferredConfig = Config.ARGB_8888;
is = context.getContentResolver().openInputStream(uri);
bitmap = BitmapFactory.decodeStream(is, null, options);
} catch (FileNotFoundException e) {
Log.e(TAG, "FileNotFoundException: " + uri);
} finally {
closeStream(is);
}
// Ensure bitmap in 8888 format, good for editing as well as GL compatible.
if ((bitmap != null) && (bitmap.getConfig() != Config.ARGB_8888)) {
Bitmap copy = bitmap.copy(Config.ARGB_8888, true);
bitmap.recycle();
bitmap = copy;
}
if (bitmap != null) {
// Scale down the sampled bitmap if it's still larger than the desired dimension.
float scale = Math.min((float) width / bitmap.getWidth(), (float) height / bitmap.getHeight());
scale = Math.max(scale, Math.min((float) height / bitmap.getWidth(), (float) width / bitmap.getHeight()));
if (scale < 1) {
Matrix m = new Matrix();
m.setScale(scale, scale);
Bitmap transformed = createBitmap(bitmap, m);
bitmap.recycle();
return transformed;
}
}
return bitmap;
}
/**
* Decodes bitmap that keeps aspect-ratio and spans most within the bounds.
*/
private Bitmap decodeBitmap(Uri uri, int width, int height) {
InputStream is = null;
Bitmap bitmap = null;
try {
// TODO: Take max pixels allowed into account for calculation to avoid possible OOM.
Rect bounds = getBitmapBounds(uri);
int sampleSize = Math.max(bounds.width() / width, bounds.height() / height);
sampleSize = Math.min(sampleSize, Math.max(bounds.width() / height, bounds.height() / width));
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = Math.max(sampleSize, 1);
options.inPreferredConfig = Config.ARGB_8888;
is = context.getContentResolver().openInputStream(uri);
bitmap = BitmapFactory.decodeStream(is, null, options);
} catch (FileNotFoundException e) {
Log.e(TAG, "FileNotFoundException: " + uri);
} finally {
closeStream(is);
}
// Ensure bitmap in 8888 format, good for editing as well as GL compatible.
if ((bitmap != null) && (bitmap.getConfig() != Config.ARGB_8888)) {
Bitmap copy = bitmap.copy(Config.ARGB_8888, true);
bitmap.recycle();
bitmap = copy;
}
if (bitmap != null) {
// Scale down the sampled bitmap if it's still larger than the desired dimension.
float scale = Math.min((float) width / bitmap.getWidth(), (float) height / bitmap.getHeight());
scale = Math.max(scale, Math.min((float) height / bitmap.getWidth(), (float) width / bitmap.getHeight()));
if (scale < 1) {
Matrix m = new Matrix();
m.setScale(scale, scale);
Bitmap transformed = createBitmap(bitmap, m);
bitmap.recycle();
return transformed;
}
}
return bitmap;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder ;
if(convertView == null){
convertView = inflater.inflate(R.layout.item_list_order, parent, false);
viewHolder = new ViewHolder();
viewHolder.iv_image = (ImageView)convertView.findViewById(R.id.order_iv);
viewHolder.tv_menusName = (TextView)convertView.findViewById(R.id.order_menusName_tv);
viewHolder.tv_amount = (TextView)convertView.findViewById(R.id.order_amount_tv);
viewHolder.tv_time = (TextView)convertView.findViewById(R.id.order_time_tv);
viewHolder.tv_price = (TextView)convertView.findViewById(R.id.order_price_tv);
viewHolder.tv_status = (TextView)convertView.findViewById(R.id.order_status_tv);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder)convertView.getTag();
}
//创建一个RequestQueue对象
RequestQueue requestQueue = Volley.newRequestQueue(context);
//创建ImageRequest对象
ImageRequest imageRequest = new ImageRequest(
Constant.URL_WEB_SERVER+datas.get(position).get("picPath").toString(),//url
new Response.Listener<Bitmap>() {//监听器Listener
@Override
public void onResponse(Bitmap response) {
viewHolder.iv_image.setImageBitmap(response);
}
//参数3、4表示图片宽高,Bitmap.Config.ARGB_8888表示图片每个像素占据4个字节大小
}, 0, 0, Config.ARGB_8888, new Response.ErrorListener() {//图片加载请求失败的回调Listener
@Override
public void onErrorResponse(VolleyError error) {
viewHolder.iv_image.setImageResource(R.drawable.ic_normal_pic);
}
});
//将ImageRequest加载到Queue
requestQueue.add(imageRequest);
viewHolder.tv_menusName.setText(datas.get(position).get("name").toString());
viewHolder.tv_amount.setText("×"+datas.get(position).get("amount").toString());
viewHolder.tv_time.setText("订单时间:"+datas.get(position).get("order_time").toString());
viewHolder.tv_price.setText("总价:￥"+datas.get(position).get("total_price").toString());
viewHolder.tv_status.setText(datas.get(position).get("status").toString());
return convertView;
}
@Override
protected void writeTextureToHardware(final GLState pGLState) {
final PixelFormat pixelFormat = this.mBitmapTextureFormat.getPixelFormat();
final int glInternalFormat = pixelFormat.getGLInternalFormat();
final int glFormat = pixelFormat.getGLFormat();
final int glType = pixelFormat.getGLType();
GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, glInternalFormat, this.mWidth, this.mHeight, 0, glFormat, glType, null);
final boolean preMultipyAlpha = this.mTextureOptions.mPreMultiplyAlpha;
/* Non alpha premultiplied bitmaps are loaded with ARGB_8888 and converted down manually. */
final Config bitmapConfig = (preMultipyAlpha) ? this.mBitmapTextureFormat.getBitmapConfig() : Config.ARGB_8888;
final ArrayList<IBitmapTextureAtlasSource> textureSources = this.mTextureAtlasSources;
final int textureSourceCount = textureSources.size();
final ITextureAtlasStateListener<IBitmapTextureAtlasSource> textureStateListener = this.getTextureAtlasStateListener();
for(int i = 0; i < textureSourceCount; i++) {
final IBitmapTextureAtlasSource bitmapTextureAtlasSource = textureSources.get(i);
try {
final Bitmap bitmap = bitmapTextureAtlasSource.onLoadBitmap(bitmapConfig);
if(bitmap == null) {
throw new NullBitmapException("Caused by: " + bitmapTextureAtlasSource.getClass().toString() + " --> " + bitmapTextureAtlasSource.toString() + " returned a null Bitmap.");
}
final boolean useDefaultAlignment = MathUtils.isPowerOfTwo(bitmap.getWidth()) && MathUtils.isPowerOfTwo(bitmap.getHeight()) && pixelFormat == PixelFormat.RGBA_8888;
if(!useDefaultAlignment) {
/* Adjust unpack alignment. */
GLES20.glPixelStorei(GLES20.GL_UNPACK_ALIGNMENT, 1);
}
if(preMultipyAlpha) {
GLUtils.texSubImage2D(GLES20.GL_TEXTURE_2D, 0, bitmapTextureAtlasSource.getTextureX(), bitmapTextureAtlasSource.getTextureY(), bitmap, glFormat, glType);
} else {
pGLState.glTexSubImage2D(GLES20.GL_TEXTURE_2D, 0, bitmapTextureAtlasSource.getTextureX(), bitmapTextureAtlasSource.getTextureY(), bitmap, this.mPixelFormat);
}
if(!useDefaultAlignment) {
/* Restore default unpack alignment. */
GLES20.glPixelStorei(GLES20.GL_UNPACK_ALIGNMENT, GLState.GL_UNPACK_ALIGNMENT_DEFAULT);
}
bitmap.recycle();
if(textureStateListener != null) {
textureStateListener.onTextureAtlasSourceLoaded(this, bitmapTextureAtlasSource);
}
} catch (final NullBitmapException e) {
if(textureStateListener != null) {
textureStateListener.onTextureAtlasSourceLoadExeption(this, bitmapTextureAtlasSource, e);
} else {
throw e;
}
}
}
}