筆記如下

2018-03-18_085026.png

• 實現(xiàn)步驟:
  1.首先動態(tài)獲取圖片
  2.畫圖片

1.準備畫紙(大小參照原圖)

Bitmap copyBitmap = Bitmap.createBitmap(srcBitmap.getWidth(),srcBitmap.getHeight(),srcBitmap.getConfig());

2.準備畫板,將畫紙放到畫板上

Canvas canvas = new Canvas(copyBitmap);

3.準備畫筆

Paint paint = new Paint();

4.按照一定規(guī)則,矩陣規(guī)則,縮放,位移規(guī)則在這里

Matrix matrix = new Matrix();
//縮放一半
matrix.setScale(0.5f,0.5f);

5.按照規(guī)則將圖像畫到畫紙上

canvas.drawBitmap(srcBitmap,matrix,paint);

    public void opts(View v){

        String path = "storage/emulated/0/6.jpg";
        Bitmap srcBitmap = BitmapFactory.decodeFile(path);
        iv_src.setImageBitmap(srcBitmap);

        //1.準備畫紙(大小參照原圖)
        Bitmap copyBitmap = Bitmap.createBitmap(srcBitmap.getWidth(),srcBitmap.getHeight(),srcBitmap.getConfig());

        //2.準備畫板,將畫紙放到畫板上
        Canvas canvas = new Canvas(copyBitmap);

        //3.準備畫筆
        Paint paint = new Paint();

        //4.按照一定規(guī)則,矩陣規(guī)則,縮放,位移規(guī)則在這里
        Matrix matrix = new Matrix();

        matrix.setScale(0.5f,0.5f);


        //5.按照規(guī)則將圖像畫到畫紙上
        canvas.drawBitmap(srcBitmap,matrix,paint);
        iv_dest.setImageBitmap(copyBitmap);

    }