public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {
   //定義集合
  private List<Fruit> mFruitList;

  //利用構(gòu)造器傳入數(shù)據(jù)
  public FruitAdapter(List<Fruit> FruitList) {
    this.mFruitList = FruitList;
  }

  //創(chuàng)建ViewHolder的實例
  // ①onCreateViewHolder()用于創(chuàng)建ViewHolder實例，并把加載的布局傳入到構(gòu)造函數(shù)
  @Override
  public FruitAdapet.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    //由于ViewHolder構(gòu)造器需要傳入子項布局View對象，因此需要實例化子項布局
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_fruit, parent, false);
    //創(chuàng)建ViewHolder對象
    ViewHolder viewHolder = new ViewHolder(view);
    //返回值
    return viewHolder;

  }

  //②onBindViewHolder()用于對RecyclerView子項的數(shù)據(jù)進行賦值，會在每個子項被滾動到屏幕內(nèi)的時候執(zhí)行
  @Override
  public void onBindViewHolder(final FruitAdapet.ViewHolder holder, int position) {
    //從集合中把水果對象拿出來
    Fruit fruit = mFruitList.get(position);
    //調(diào)用holder.ImageView對象設置圖片
    holder.imageView.setImageResource(fruit.getImageId());
    //調(diào)用holder.TextView對象設置文字
    holder.textView.setText(fruit.getName());

  }

  //③getItemCount()用于知道RecyclerView有多少子項
  @Override
  public int getItemCount() {

    return mFruitList.size();
  }

  //創(chuàng)建ViewHolder繼承RecyclerView.ViewHolder
  class ViewHolder extends RecyclerView.ViewHolder {
    ImageView imageView;
    TextView textView;


    //重寫ViewHolder
    public ViewHolder(View itemView) {
      super(itemView);
      //通過View對象的findViewById方法獲取到子項布局的控件保存在成員變量當中
      imageView = (ImageView) itemView.findViewById(R.id.imageView);

      textView = (TextView) itemView.findViewById(R.id.textView);
    }
  }
}

public class MainActivity extends AppCompatActivity {
  private List<Fruit> fruitList;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //第三步：定義數(shù)據(jù)源，單獨利用一個方法
    fruitData();

    //第四步：創(chuàng)建適配器
    FruitAdapet adapet = new FruitAdapet(fruitList);

    //第五步：找布局控件
    RecyclerView recyclerView= (RecyclerView) findViewById(R.id.recyclerView);

    //第六步：通過setLayoutManager()為RecylerView設置布局管理器
    //設置為垂直方向
    //水平方向的參數(shù)為：(this,LinearLayoutManager.HORIZONTAL, false);
    LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this,
        LinearLayoutManager.VERTICAL,false);
    recyclerView.setLayoutManager(linearLayoutManager);

    //第七步：設置適配器
    recyclerView.setAdapter(adapet);
  }

  public void fruitData() {
    //創(chuàng)建一個集合保存數(shù)據(jù)
    fruitList = new ArrayList<>();
    //圖片我就用了幾張，然后讓他循環(huán)變換而已，小伙伴可以自己增加各式的圖片
    Fruit apple = new Fruit("蘋果", R.drawable.apple);
    fruitList.add(apple);
    Fruit banana = new Fruit("香蕉", R.drawable.banana);
    fruitList.add(banana);
    Fruit apple1 = new Fruit("蘋果", R.drawable.apple);
    fruitList.add(apple);
    Fruit banana1 = new Fruit("香蕉", R.drawable.banana);
    fruitList.add(banana);
    Fruit apple2 = new Fruit("蘋果", R.drawable.apple);
    fruitList.add(apple);
    Fruit banana2 = new Fruit("香蕉", R.drawable.banana);
    fruitList.add(banana);
    Fruit apple3 = new Fruit("蘋果", R.drawable.apple);
    fruitList.add(apple);
    Fruit banana3 = new Fruit("香蕉", R.drawable.banana);
    fruitList.add(banana);
    Fruit apple4 = new Fruit("蘋果", R.drawable.apple);
    fruitList.add(apple);
    Fruit banana4 = new Fruit("香蕉", R.drawable.banana);
    fruitList.add(banana);
  }
}

//第一個參數(shù)用于指定布局的列數(shù)
//第二個參數(shù)用于指定布局的排列方向
   StaggeredGridLayoutManager layoutManager=new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
 recyclerView.setLayoutManager(layoutManager);