android bitmap的 一些簡單操作

標籤：android   bitmap   

原文連結：http://www.2cto.com/kf/201312/265180.html

全都是一些程式碼片段，需要可以直接貼過去用

/** 擷取 drawable 的圖片   可以迴圈   1.圖名    2.drawable 3.包名      **/    int imgid = getResources().getIdentifier("ic_launcher", "drawable", "com.example.anywight");    text.setBackgroundResource(imgid);

/** 通過圖片id獲得Bitmap  **/    Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

/** view轉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;}

/** 將控制項轉換為bitmap **/public static Bitmap convertViewToBitMap(View view) {// 開啟映像緩衝view.setDrawingCacheEnabled(true);// 必須調用measure和layout方法才能成功儲存可視組件的到png影像檔// 測量View大小view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));// 發送位置和尺寸到View及其所有的子Viewview.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());// 獲得可視組件的Bitmap bitmap = view.getDrawingCache();return bitmap;}

<span style="font-family: Arial, Helvetica, sans-serif;"></span><pre name="code" class="java">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;}

/**  擷取螢幕的bitmap對象的代碼如下  **/public Bitmap getScreenPic(View view){         View rootView = view.getRootView();    rootView.setDrawingCacheEnabled(true);    rootView.buildDrawingCache();    // 不明白為什麼這裡返回一個空，有文章說不能在oncreat方法中調用    // 測量View大小    rootView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));    // 發送位置和尺寸到View及其所有的子View    rootView.layout(0, 0, rootView.getMeasuredWidth(), rootView.getMeasuredHeight());    // 解決措施，調用上面的measure和layout方法之後，傳回值就不再為空白    // 如果想要建立的是固定長度和寬度的呢？    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;}  /**  將text  轉換成  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; } /**  顯示將bitmap進行縮放       **/public Bitmap  bitmapScanel(Context context){    //通過openRawResource擷取一個inputStream對象      InputStream inputStream = context.getResources().openRawResource(R.id.backageground);      //通過一個InputStream建立一個BitmapDrawable對象      BitmapDrawable drawable = new BitmapDrawable(inputStream);      //通過BitmapDrawable對象獲得Bitmap對象      Bitmap bitmap = drawable.getBitmap();      //利用Bitmap對象建立縮圖      bitmap = ThumbnailUtils.extractThumbnail(bitmap, 40, 40);      return bitmap;  }   /**  放大縮小圖片    **/ 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;  }     /** 獲得圓角圖片的方法  **/ 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;  }     /** 對 bitmap 進行裁剪     **/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;}   /** * 圖片的倒影效果 */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; }

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android bitmap的 一些簡單操作