android 绘制视频教程 android绘制图片

一、使用imageView

try {
            InputStream inputStream = getAssets().open("11.png");
            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
            ((ImageView)findViewById(R.id.image1)).setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }

二、使用surfaceView

SurfaceView surfaceView = findViewById(R.id.image2);
        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(@NonNull SurfaceHolder surfaceHolder) {
                Paint paint = new Paint();
                paint.setAntiAlias(true);
                paint.setStyle(Paint.Style.STROKE);

                InputStream inputStream = null;
                try {
                    inputStream = getAssets().open("11.png");
                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                    Canvas canvas = surfaceHolder.lockCanvas();
                    canvas.drawBitmap(bitmap, 0, 0, paint);
                    surfaceHolder.unlockCanvasAndPost(canvas);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceChanged(@NonNull SurfaceHolder surfaceHolder, int i, int i1, int i2) {

            }

            @Override
            public void surfaceDestroyed(@NonNull SurfaceHolder surfaceHolder) {

            }
        });

三、使用自定义view

public class CustomImage extends View {
    Paint paint = new Paint();
    Bitmap bitmap;

    public CustomImage(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        paint.setAntiAlias(true);
        paint.setStyle(Paint.Style.STROKE);
        try {
            InputStream inputStream = context.getAssets().open("11.png");
            bitmap = BitmapFactory.decodeStream(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (bitmap != null) {
            canvas.drawBitmap(bitmap, 0, 0, paint);
        }
    }
}