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获取方式
/** 获取 drawable 的图片 可以循环 1.图名 2.drawable 3.包名 **/
int imgid = getResources().getIdentifier("ic_launcher", "drawable", "com.example.anywight");
text.setBackgroundResource(imgid);
/** 通过图片id获得Bitmap **/
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
/** 通过 assest 获取 获得Drawable bitmap **/
InputStream in = this.getAssets().open("ic_launcher");
Drawable da = Drawable.createFromStream(in, null);
Bitmap mm = BitmapFactory.decodeStream(in);
/** 通过 sdcard 获得 bitmap **/
Bitmap bit = BitmapFactory.decodeFile("/sdcard/android.jpg");
常用操作
/** view转Bitmap **/
public static Bitmap convertViewToBitmap(View view, int bitmapWidth, int bitmapHeight) {
Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);
view.draw(new Canvas(bitmap));
return bitmap;
}
/** 将控件转换为bitmap **/
public static Bitmap convertViewToBitMap(View view) {
// 打开图像缓存
view.setDrawingCacheEnabled(true);
// 必须调用measure和layout方法才能成功保存可视组件的截图到png图像文件
// 测量View大小
view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
// 发送位置和尺寸到View及其所有的子View
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
// 获得可视组件的截图
Bitmap bitmap = view.getDrawingCache();
return bitmap;
}
public static Bitmap getBitmapFromView(View view) {
Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
Drawable bgDrawable = view.getBackground();
if (bgDrawable != null)
bgDrawable.draw(canvas);
else
canvas.drawColor(Color.WHITE);
view.draw(canvas);
return returnedBitmap;
}
/** 获取屏幕截图的bitmap对象的代码如下 **/
public Bitmap getScreenPic(View view) {
View rootView = view.getRootView();
rootView.setDrawingCacheEnabled(true);
rootView.buildDrawingCache();
// 不明白为什么这里返回一个空，有帖子说不能在oncreat方法中调用
// 测量View大小
rootView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
// 发送位置和尺寸到View及其所有的子View
rootView.layout(0, 0, rootView.getMeasuredWidth(), rootView.getMeasuredHeight());
// 解决措施，调用上面的measure和layout方法之后，返回值就不再为空
// 如果想要创建的是固定长度和宽度的呢？
Bitmap bitmap = rootView.getDrawingCache();
rootView.destroyDrawingCache();
return bitmap;
}
/** Drawable → Bitmap **/
public static Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
// canvas.setBitmap(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}
/** bitmap → drawable **/
public static Drawable bitmapToDrawable(Context context, String filename) {
Bitmap image = null;
BitmapDrawable ddd = null;
try {
AssetManager am = context.getAssets();
InputStream is = am.open(filename);
image = BitmapFactory.decodeStream(is);
ddd = new BitmapDrawable(context.getResources(), image);
is.close();
} catch (Exception e) {
}
return ddd;
}
/** byte[] → Bitmap **/
public static Bitmap byteToDrawable(Context context, byte[] bb) {
Bitmap pp = BitmapFactory.decodeByteArray(bb, 0, bb.length);
return pp;
}
/** Bitmap → byte[] **/
public static byte[] bitmapToByte(Bitmap bitmap) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] yy = baos.toByteArray();
return yy;
}
/** 将text 转换成 bitmap **/
public static Bitmap createTxtImage(String txt, int txtSize) {
Bitmap mbmpTest = Bitmap.createBitmap(txt.length() * txtSize + 4, txtSize + 4, Config.ARGB_8888);
Canvas canvasTemp = new Canvas(mbmpTest);
Paint p = new Paint();
p.setAntiAlias(true);
p.setColor(Color.WHITE);
p.setTextSize(txtSize);
canvasTemp.drawText(txt, 2, txtSize - 2, p);
return mbmpTest;
}
/** 显示将bitmap进行缩放 **/
public Bitmap bitmapScanel(Context context) {
// 通过openRawResource获取一个inputStream对象
InputStream inputStream = context.getResources().openRawResource(R.id.backageground);
// 通过一个InputStream创建一个BitmapDrawable对象
BitmapDrawable drawable = new BitmapDrawable(inputStream);
// 通过BitmapDrawable对象获得Bitmap对象
Bitmap bitmap = drawable.getBitmap();
// 利用Bitmap对象创建缩略图
bitmap = ThumbnailUtils.extractThumbnail(bitmap, 40, 40);
return bitmap;
}
/** 放大缩小图片 **/
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidht = ((float) w / width);
float scaleHeight = ((float) h / height);
matrix.postScale(scaleWidht, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
return newbmp;
}
/** 获得圆角图片的方法 **/
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
/** 对 bitmap 进行裁剪 **/
public Bitmap bitmapClip(Context context, int id, int x, int y) {
Bitmap map = BitmapFactory.decodeResource(context.getResources(), id);
map = Bitmap.createBitmap(map, x, y, 120, 120);
return map;
}
/**
* 图片的倒影效果
*/
public static Bitmap createReflectedImage(Bitmap originalImage) {
final int reflectionGap = 4;
int width = originalImage.getWidth();
int height = originalImage.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
// Create a Bitmap with the flip matrix applied to it.
// We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width, height / 2, matrix, false);
// Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);
// Create a new Canvas with the bitmap that's big enough for
// the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
// Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
// Draw in the gap
Paint defaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);
// Draw in the reflection
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
// Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff,
TileMode.CLAMP);
// Set the paint to use this shader (linear gradient)
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
return bitmapWithReflection;
}