android 图片的显示picasso

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1.引用

compile 'com.squareup.picasso:picasso:2.5.2'

2.使用

Picasso.with(activity)        .load(item.optString("img"))        .placeholder(R.drawable.defaule_hui_small)        .error(R.drawable.defaule_hui_small)        .resize(LocalDisplay.SCREEN_WIDTH_PIXELS*3/10, LocalDisplay.SCREEN_WIDTH_PIXELS*2/10)        .into(holder.image);

3.这个类计算屏幕的宽与高

public class LocalDisplay {    public static int SCREEN_WIDTH_PIXELS;    public static int SCREEN_HEIGHT_PIXELS;    public static float SCREEN_DENSITY;    public static int SCREEN_WIDTH_DP;    public static int SCREEN_HEIGHT_DP;    public static void init(DisplayMetrics dm) {        SCREEN_WIDTH_PIXELS = dm.widthPixels;        SCREEN_HEIGHT_PIXELS = dm.heightPixels;        SCREEN_DENSITY = dm.density;        SCREEN_WIDTH_DP = (int) (SCREEN_WIDTH_PIXELS / dm.density);        SCREEN_HEIGHT_DP = (int) (SCREEN_HEIGHT_PIXELS / dm.density);    }    public static int dp2px(float dp) {        final float scale = SCREEN_DENSITY;        return (int) (dp * scale + 0.5f);    }    public static int designedDP2px(float desingDP) {        if (SCREEN_WIDTH_DP != 320) {            desingDP = desingDP * SCREEN_WIDTH_DP / 320f;        }        return dp2px(desingDP);    }    public static void setPadding(final View view, float left, float top, float right, float bottom) {        view.setPadding(designedDP2px(left), dp2px(top), designedDP2px(right), dp2px(bottom));    }}

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