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第一种：ImageView

/* BitmapFactory.decodeFile(Environment.getExternalStorageDirectory().getPath()        + File.separator + "11.jpg"); 获取存储文件中的图片*/        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.image1);        ImageView imageView = findViewById(R.id.iv);        imageView.setImageBitmap(bitmap);        Log.d("TAG",File.separator);//File.separator == "/"

第二种 SurfaceView

final SurfaceView surfaceView = findViewById(R.id.iv);        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
               @Override//视图被创造            public void surfaceCreated(SurfaceHolder surfaceHolder) {
                   if(surfaceHolder == null){
                       return;                }                //用画笔描绘图片                Paint paint = new Paint();                paint.setAntiAlias(true);                paint.setStyle(Paint.Style.STROKE);                Bitmap bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.image1);                Canvas canvas = surfaceHolder.lockCanvas();//锁定surfaceView的画布                canvas.drawBitmap(bitmap,0,0,paint);//(0,0)从图片的左上角开始绘制                 surfaceHolder.unlockCanvasAndPost(canvas);//解锁显示图片            }            @Override//视图被改变            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
               }            @Override//视图被摧毁            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
               }        });

第三种 自定义View

public class DiyImageView extends View {
       Paint paint = new Paint();    	Bitmap bitmap;    	public DiyImageView(Context context) {
       		super(context);     		paint.setAntiAlias(true);   		paint.setStyle(Paint.Style.STROKE);    		bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.image1);		//bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory().getPath() + File.separator + "11.jpg");  // 获取bitmap   	}   		@Override    	protected void onDraw(Canvas canvas) {
       		super.onDraw(canvas);       		// 不建议在onDraw做任何分配内存的操作    		if (bitmap != null) {
              			canvas.drawBitmap(bitmap, 0, 0, paint);      		}    	}}

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