初涉RxAndroid結合Glide實現多圖片加載操作

TestOBJ用於給RecycleView引用圖片地址和文字內容

public class TestOBJ {
    public String imageUrl;
    public String content;
}

翔哥那個類不解釋了，可以自己去搜搜百度第一條就是，我們再來看看適配器

DataAdapter(重要步驟的解釋也在注釋裡了)

public class DataAdapter extends RecyclerView.Adapter {
    Context context;
    List testOBJs;

    public DataAdapter(Context context) {
        this.context = context;
    }

    //獲取布局
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new DataViewHolder(view);
    }

    //具體item的加載圖片填充數據
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        DataViewHolder dataViewHolder = (DataViewHolder) holder;
        TestOBJ obj = testOBJs.get(position);
//先獲取上下文對象，再加載具體的URL然後填充到控件裡去
        Glide.with(holder.itemView.getContext()).load(obj.imageUrl).into(dataViewHolder.imageIV);
        dataViewHolder.contentTV.setText(obj.content);
    }

    @Override
    public int getItemCount() {
        return testOBJs == null ? 0 : testOBJs.size();
    }

    //控件對象Holder
    static class DataViewHolder extends RecyclerView.ViewHolder {
        ImageView imageIV;
        TextView contentTV;

        public DataViewHolder(View itemView) {
            super(itemView);
            imageIV = (ImageView) itemView.findViewById(R.id.imageIV);
            contentTV = (TextView) itemView.findViewById(R.id.contentTV);
        }
    }

    //刷新數據用
    public void updateData(List testOBJs) {
        this.testOBJs = testOBJs;
        notifyDataSetChanged();
    }
}

數據層已經OK了，我們來看看業務層

public class MainActivity extends AppCompatActivity {
    Toolbar toolBar;
    RecyclerView recycleView;
    DataAdapter dataAdapter;
    //URL數據源
    String data[] = {"http://hiphotos.baidu.com/zhixin/abpic/item/4651a712c8fcc3cea97dbce49045d688d53f206c.jpg"
            , "http://pic.5442.com/2014/0930/06/5442.jpg",
            "http://img5q.duitang.com/uploads/item/201410/22/20141022214043_5EEKH.thumb.224_0.jpeg",
            "http://img5.duitang.com/uploads/item/201512/08/20151208163159_HGEM2.thumb.224_0.png",
            "http://img4.duitang.com/uploads/item/201510/29/20151029224537_ijEKF.thumb.224_0.jpeg",
            "http://img5.imgtn.bdimg.com/it/u=1230273521,1023320328&fm=21&gp=0.jpg"
    };

    //被觀察者
    Observable observable = Observable.create(new Observable.OnSubscribe>() {
        @Override
        public void call(Subscriber> subscriber) {
            subscriber.onNext(makeData());
            subscriber.onCompleted();
        }
    });

    //觀察者
    Observer> observer = new Observer>() {

        @Override
        public void onCompleted() {
            LogUtils.d("--->onCompleted");
        }

        @Override
        public void onError(Throwable e) {
            Toast.makeText(MainActivity.this, "加載失敗", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onNext(List testOBJs) {
            testOBJs.size();
            LogUtils.d("--->onNext  testOBJs.size() " + testOBJs.size());
            //刷新數據
            dataAdapter.updateData(testOBJs);
        }
    };


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

        init();
        logic();
        setSupportActionBar(toolBar);
        StatusBarCompat.compat(this, getResources().getColor(R.color.status_bar_color));
        StatusBarCompat.compat(this);
    }

    private void init() {
        LogUtils.d("--->init");
        toolBar = (Toolbar) findViewById(R.id.toolBar);
        recycleView = (RecyclerView) findViewById(R.id.recycleView);

        observable.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(observer);

    }

    private void logic() {
        LogUtils.d("--->logic");
        dataAdapter = new DataAdapter(MainActivity.this);
        recycleView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
        recycleView.setAdapter(dataAdapter);

        LogUtils.d("--->Glide.getPhotoCacheDir " + Glide.getPhotoCacheDir(MainActivity.this, "MY_CACHE_LOCATION"));

    }

    //制造數據
    private List makeData() {
        List list = new ArrayList<>();
        TestOBJ testOBJ;
        for (int k = 0; k < 5; k++) {
            testOBJ = new TestOBJ();
            testOBJ.content = "標題啊,你服不服 " + k + " 個 ";
            testOBJ.imageUrl = data[k];
            list.add(testOBJ);
        }
        LogUtils.d("--->list的長度等於 " + list.size());
        return list;
    }

    @Override
    protected void onPause() {
        super.onPause();
        //清除請求
        Glide.clear(recycleView);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        LogUtils.d("--->onDestroy");
        //必須主線程使用
        Glide.get(this).clearMemory();
        //Glide.get(this).clearDiskCache(); 非主線程
    }
}

解釋：
我們定義了一個觀察者和一個被觀察者然後自從

 observable.subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(observer);

注冊的行為開始後，只咬被觀察者一有風吹草動，觀察者的相關回調就會被觸發，我們來看下Log的打印順序

還是在一堆的Activity生命周期裡先跑在我們數據摸你的過程中看了可能我們Glide緩存的目錄，跟我們的預設一致,接著就執行了 onNext再是onCompleted，因為沒出什麼意外也就沒刷出onError

/data/user/0/sample.wjj.rxandroidglidedemo/cache/MY_CACHE_LOCATION