package com.example.recyclerview_staggered;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import 
 
com.example.recyclerview_staggered.adapter.RecyclerViewStaggeredAdapter;
import com.example.recyclerview_staggered.menu.DateBean;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerVIew;
    private int[] image = {R.drawable.cxy1, R.drawable.cxy8
 
, R.drawable.cxy7,
            R.drawable.cxy2, R.drawable.cxy4, R.drawable.cxy5,
            R.drawable.cxy3, R.drawable.cxy1, R.drawable.cxy6,
            R.drawable.cxy1, R.drawable.cxy8, R.drawable.cxy7,
            R.drawable.cxy2, R.drawable.cxy4, R.drawable.cxy5,
            R.drawable.cxy3, R.drawable.cxy1
 
, R.drawable.cxy6};

    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控制元件
mRecyclerVIew = (RecyclerView) findViewById(R.id.recyclerView);
    }

    //RecyclerView實現瀑布流的效果，實際上就是
private void loadStaggeredDate(Boolean inversion, Boolean orientation) {
        //集合物件
ArrayList<DateBean> dateBeanArrayList = new ArrayList<>();
        //給Bean類放資料，把裝好資料的Bean類放到集合裡
for (int i = 0; i < image.length; i++) {
            //建立Bean類物件
DateBean dateBean = new DateBean();
            //給benu類物件新增圖片和資訊
dateBean.icon = image[i];
            dateBean.name = "RecyclerStaggered" + i;
            //把Bean類放入集合
dateBeanArrayList.add(dateBean);
        }
        //建立介面卡adapter物件 引數1.上下文 2.資料載入集合
RecyclerViewStaggeredAdapter recyclerViewStaggeredAdapter = new RecyclerViewStaggeredAdapter(this, dateBeanArrayList);
        //設定介面卡
mRecyclerVIew.setAdapter(recyclerViewStaggeredAdapter);
        //佈局管理器
StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(2, orientation ? StaggeredGridLayoutManager.VERTICAL : StaggeredGridLayoutManager.HORIZONTAL);
        staggeredGridLayoutManager.setReverseLayout(inversion);
        //設定佈局管理器 引數GridManager 可以使RecyclerView實現和GridView一樣的效果
mRecyclerVIew.setLayoutManager(staggeredGridLayoutManager);

    }

    /*
     *下面的程式碼和RecycleView沒有關係，是選單，方便RecycleView的展示
     */
    //載入選單佈局
@Override
public boolean onCreateOptionsMenu(Menu menu) {
        //載入佈局使用選單特有方法，getMenuInflate物件
        //引數1.選單顯示的佈局 2.固定Menu
getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    //選單按鈕點選事件處理
@Override
public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();
        if (itemId == R.id.action_Staggered_noraml) {
            //標準顯示（垂直）
loadStaggeredDate(false, true);
            Toast.makeText(MainActivity.this, "成功", Toast.LENGTH_SHORT).show();
            return true;
        }//Staggered垂直反向顯示
else if (itemId == R.id.action_Staggered_vertical_reverse) {
            loadStaggeredDate(true, true);
        }//Staggered水平顯示
else if (itemId == R.id.action_Staggered_horizontal) {
            loadStaggeredDate(false, false);
        }//Staggered水平反向
else if (itemId == R.id.action_Staggered_horizontal_reverse) {
            loadStaggeredDate(true, false);
        }
        return super.onOptionsItemSelected(item);
    }
}