Picasso的使用

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主页: https://github.com/square/picasso

使用步骤

添加依赖 compile ‘com.squareup.picasso:picasso:2.5.2’

添加权限:

<uses-permission android:name="android.permission.INTERNET"/>

加载图片,示例代码:

Picasso        .with(this)// 指定Context        .load(URL_IMG3) //指定图片URL        .placeholder(R.mipmap.ic_launcher) //指定图片未加载成功前显示的图片        .error(R.mipmap.ic_launcher)// 指定图片加载失败显示的图片        .resize(300, 300)// 指定图片的尺寸        .fit()// 指定图片缩放类型为fit        .centerCrop()// 指定图片缩放类型为centerCrop        .centerInside()// 指定图片缩放类型为centerInside        .memoryPolicy(MemoryPolicy.NO_CACHE, MemoryPolicy.NO_STORE)// 指定内存缓存策略        .priority(Picasso.Priority.HIGH)// 指定优先级        .into(imageView); // 指定显示图片的ImageView

显示圆形图片.示例代码:

    // 自定义Transformation    Transformation transform = new Transformation() {        @Override        public Bitmap transform(Bitmap source) {            int size = Math.min(source.getWidth(), source.getHeight());            int x = (source.getWidth() - size) / 2;            int y = (source.getHeight() - size) / 2;            Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);            if (squaredBitmap != source) {                source.recycle();            }            Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());            Canvas canvas = new Canvas(bitmap);            Paint paint = new Paint();            BitmapShader shader = new BitmapShader(squaredBitmap,                    BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);            paint.setShader(shader);            paint.setAntiAlias(true);            float r = size / 2f;            canvas.drawCircle(r, r, r, paint);            squaredBitmap.recycle();            return bitmap;        }        @Override        public String key() {            return "circle";        }    };    Picasso            .with(this)// 指定Context            .load(URL_IMG2) //指定图片URL            .transform(transform) // 指定图片转换器            .into(imageView); // 指定显示图片的ImageView

显示圆角图片

class RoundedTransformation implements com.squareup.picasso.Transformation {    private final int radius;    private final int margin;  // dp    // radius is corner radii in dp    // margin is the board in dp    public RoundedTransformation(final int radius, final int margin) {        this.radius = radius;        this.margin = margin;    }    @Override    public Bitmap transform(final Bitmap source) {        final Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));        Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(output);        canvas.drawRoundRect(new RectF(margin, margin, source.getWidth() - margin, source.getHeight() - margin), radius, radius, paint);        if (source != output) {            source.recycle();        }        return output;    }    @Override    public String key() {        return "rounded(radius=" + radius + ", margin=" + margin + ")";    }}Picasso        .with(this)// 指定Context        .load(URL_IMG2) //指定图片URL        .transform(new RoundedTransformation(360,0)) // 指定图片转换器        .into(imageView); // 指定显示图片的ImageView

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