RecyclerView跳轉+EventBus傳值+fresco圖片加載

   加依賴

compile 'com.android.support:recyclerview-v7:26.0.+'

compile 'org.greenrobot:eventbus:3.0.0'

compile 'com.facebook.fresco:fresco:1.5.0'


寫權限

<uses-permission android:name="android.permission.INTERNET"/>
要想用fresco加載圖片必須在manifest 的application中加入android:name

MyApp類

public class MyApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        //初始化Fresco

        Fresco.initialize(this);
    }

MessageEvent類
  //建立消息類

public class MessageEvent {
    String name;

    public MessageEvent(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

MyAdapter類
//設置適配器並加入點擊事件

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private MyItemClickListener mItemClickListener;
    private Context mContext;
    private List<String> mList;

    public MyAdapter(MainActivity mainActivity, List<String> list) {
        this.mContext = mainActivity;
        this.mList = list;
    }

    @Override

    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(mContext, R.layout.item, null);
        //將全局的監聽傳遞給holder
        ViewHolder holder = new ViewHolder(view, mItemClickListener);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyAdapter.ViewHolder holder, int position) {
        //給空間賦值
       holder.tv.setText(mList.get(position));
        holder.sdv.setImageURI("http://p0.so.qhimgs1.com/t017746110f02d2c3bc.jpg");
    }


    @Override
    public int getItemCount() {
        return mList.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private MyItemClickListener mListener;
        private SimpleDraweeView sdv;
        private TextView tv;
        public ViewHolder(View itemView, MyItemClickListener myItemClickListener) {
            super(itemView);
            //將全局的監聽賦值給接口
            this.mListener = myItemClickListener;
            itemView.setOnClickListener(this);
            sdv=itemView.findViewById(R.id.sdv);
            tv=itemView.findViewById(R.id.tv);
        }

        /**
         * 實現OnClickListener接口重寫的方法
         * @param v
         */
        @Override
        public void onClick(View v) {
            if (mListener != null) {
                mListener.onItemClick(v, getPosition());
            }

        }
    }

    /**
     * 建立一個回調接口
     */
    public interface MyItemClickListener {
        void onItemClick(View view, int position);
    }

    /**
     * 在activity裏面adapter就是調用的這個方法,將點擊事件監聽傳遞過來,並賦值給全局的監聽
     *
     * @param myItemClickListener
     */
    public void setItemClickListener(MyItemClickListener myItemClickListener) {
        this.mItemClickListener = myItemClickListener;
    }
}

MainActivity類
//顯示RecyclerView界面 並用EventBus發送消息

public class MainActivity extends AppCompatActivity {
    private RecyclerView rcv;
    private MyAdapter mAdapter;
    private  List<String> list=new ArrayList<>();
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        rcv= (RecyclerView) findViewById(R.id.rcv);
        for (int i=0;i<10;i++){
            list.add("ajugduyagd");
        }
        mAdapter=new MyAdapter(MainActivity.this,list);
        LinearLayoutManager manager=new LinearLayoutManager(this);
        rcv.setLayoutManager(manager);
        rcv.setAdapter(mAdapter);
        mAdapter.setItemClickListener(new MyAdapter.MyItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                EventBus.getDefault().post(new MessageEvent("我就日了"));
                startActivity(new Intent(MainActivity.this,MainActivity2.class));
                Toast.makeText(MainActivity.this, "點擊了" + position, Toast.LENGTH_SHORT).show();
            }
        });


    }
}

MainActivity2類
//接受MainActivity發送的消息並顯示

public class MainActivity2 extends AppCompatActivity{    private TextView tv;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        tv= (TextView) findViewById(R.id.tv);        EventBus.getDefault().register(this);    }    @Subscribe(threadMode = ThreadMode.MAIN)    public void onEvent(MessageEvent event){       tv.setText(event.getName());    }    @Override    protected void onDestroy() {        super.onDestroy();        EventBus.getDefault().unregister(this);    }}