Android开发常用：Fresco加载图片的几种方式

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/shb2058/article/details/72722646

XML使用

xmlns:fresco="http://schemas.android.com/apk/res-auto"

 <!--用户头像-->
        <com.facebook.drawee.view.SimpleDraweeView
            app:layout_marginTopPercent="1%sh"
            android:layout_alignParentRight="true"
            app:layout_marginRightPercent="2%sw"
            app:layout_widthPercent="8%sw"
            app:layout_heightPercent="8%sw"
            android:id="@+id/user_photo"
            android:layout_width="0dp"
            android:layout_height="0dp"
            fresco:placeholderImage="@drawable/user"
            fresco:actualImageScaleType="centerCrop"
            fresco:placeholderImageScaleType="fitCenter"
            fresco:roundAsCircle="true" />

封装的方法：分别是从res和从网络加载（注：下面的从res加载图片的方法是错误的）

   private void setImageViewFromRes(final String imageName, final SimpleDraweeView imageView){
        Observable.create(new ObservableOnSubscribe<String>() {
            @Override
            public void subscribe(@NonNull ObservableEmitter<String> e) throws Exception {

                e.onNext(imageName);


            }
        }).observeOn(AndroidSchedulers.mainThread()).subscribeOn(Schedulers.io()).subscribe(new Observer<String>() {
            @Override
            public void onSubscribe(@NonNull Disposable d) {

            }

            @Override
            public void onNext(@NonNull String s) {
                Uri uri = Uri.parse("res://" +
                        mContext.getPackageName() +
                        "/" + s);
                imageView.setImageURI( Uri.parse("res://" +
                        mContext.getPackageName() +
                        "/" + s));
            }

            @Override
            public void onError(@NonNull Throwable e) {

            }

            @Override
            public void onComplete() {

            }
        });

    }
    private void setImageView(final String uri, final SimpleDraweeView imageView){
        Observable.create(new ObservableOnSubscribe<String>() {
            @Override
            public void subscribe(@NonNull ObservableEmitter<String> e) throws Exception {

                e.onNext(uri);


            }
        }).observeOn(AndroidSchedulers.mainThread()).subscribeOn(Schedulers.io()).subscribe(new Observer<String>() {
            @Override
            public void onSubscribe(@NonNull Disposable d) {

            }

            @Override
            public void onNext(@NonNull String s) {
                imageView.setImageURI(Uri.parse(s));
            }

            @Override
            public void onError(@NonNull Throwable e) {

            }

            @Override
            public void onComplete() {

            }
        });

    }

 <com.facebook.drawee.view.SimpleDraweeView
                    android:layout_alignParentLeft="true"
                    app:layout_heightPercent="80%h"
                    app:layout_widthPercent="80%h"
                    android:id="@+id/user_photo"
                    app:layout_marginLeftPercent="3%w"
                    android:layout_width="0dp"
                    android:layout_height="0dp"
                    android:layout_centerVertical="true"
                    android:background="@drawable/avatar"
                    fresco:roundAsCircle="true"
                    fresco:roundingBorderColor="@color/gray"
                    fresco:roundingBorderWidth="1px" />

1.网络图

里面的参数是图片的网络地址

userPhoto.setImageURI(SharedPreferenceUtils.get(context, "myInfo", "Photo", "").toString());

2.drawable图

 /**
     * 加载本地图片（drawable图片）
     * @param context
     * @param simpleDraweeView
     * @param id
     */
    public static void loadResPic(Context context, SimpleDraweeView simpleDraweeView, int id) {
        Uri uri = Uri.parse("res://" +
                context.getPackageName() +
                "/" + id);
        simpleDraweeView.setImageURI(uri);
    }

3.file图

userPhoto.setImageURI(Uri.parse("file://"+result.getImage().getCompressPath()));