Android ImageDecoder读取GIF图片

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 获取TextView对象
        TextView textView = findViewById(R.id.tv);
        // 获取ImageView对象
        ImageView imageView = findViewById(R.id.image);
        // ①、创建ImageDecoder.Source对象
        ImageDecoder.Source source = ImageDecoder.createSource(getResources(), R.drawable.fat_po);
        try {
            // ②，执行decodeDrawable()方法获取Drawable对象
            @SuppressLint("WrongThread") Drawable drawable = ImageDecoder.decodeDrawable(source, (decoder, info, s) -> {
                // 通过info参数获取被解码的图片信息
                textView.setText("图片原始宽度" + info.getSize().getWidth()
                        + "\n" + "图片原始高度" + info.getSize().getHeight());
                // 设置图片解码之后的缩放大小
                decoder.setTargetSize(600, 580);
            });
            imageView.setImageDrawable(drawable);
            // 如果drawable是AnimatedImageDrawable的实例，执行动画
            if (drawable instanceof AnimatedImageDrawable) {
                ((AnimatedImageDrawable) drawable).start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

摘抄至《疯狂Android讲义（第4版）》