MyRecycleViewActivity.java

package com.com.mr_wrong.RecyclerView;

import android.content.Context;
import android.graphics.Rect;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;

import com.Utils.LogUtils;
import com.example.mr_wrong.androidstudioproject.R;

import java.util.ArrayList;
import java.util.List;

import butterknife.ButterKnife;
import butterknife.InjectView;

/**
 * Created by Mr_Wrong on 15/7/25.
 */
public class MyRecycleViewActivity extends AppCompatActivity {
    @InjectView(R.id.edittext)
    EditText edittext;
    private RecyclerView mRecycleView;
    private Context mContext;
    private List<String> mydatas;
    private List<Integer> mHeights;
    private LayoutInflater mLayoutinflater;
    List<String> mDatas;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_single_recyclerview);
        ButterKnife.inject(this);

        fun();

        edittext.post(new Runnable() {
            @Override
            public void run() {
                InputMethodManager m = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                m.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
            }
        });

        mRecycleView = (RecyclerView) findViewById(R.id.id_recyclerview);
        initData();

        mRecycleView.setOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                if (dy > 0) {//上
                    show();
                } else {//下滑
                    hide();
                }
            }

        });

        mRecycleView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
        mRecycleView.setLayoutManager(new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL));
        mRecycleView.setItemAnimator(new DefaultItemAnimator());
        mRecycleView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL_LIST));
        mRecycleView.setAdapter(new MyRectcleAdapter(this, mDatas));


    }


    private void hide() {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(edittext.getWindowToken(), 0); //强制隐藏键盘
    }

    private void show() {
        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(edittext, InputMethodManager.SHOW_FORCED);
    }

    private void initData() {
        mDatas = new ArrayList<String>();
        for (int i = 'A'; i < 'z'; i++) {
            mDatas.add("" + (char) i);
        }
    }

    class MyRectcleAdapter extends RecyclerView.Adapter<MyRectcleAdapter.MyViewHolder> {

        public MyRectcleAdapter(Context context, List<String> datas) {
            mContext = context;
            mydatas = datas;
            mLayoutinflater = LayoutInflater.from(context);

            mHeights = new ArrayList<>();
            for (int i = 0; i < mydatas.size(); i++) {
                mHeights.add((int) (100 + Math.random() * 300));
            }
        }

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

        @Override
        public void onBindViewHolder(MyViewHolder holder, int position) {
            ViewGroup.LayoutParams lp = holder.tv.getLayoutParams();
            lp.height = mHeights.get(position);

            holder.tv.setText(mydatas.get(position));
            holder.tv.setLayoutParams(lp);
        }

        @Override
        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            return new MyViewHolder(mLayoutinflater.inflate(R.layout.item_staggered_home, parent, false));
        }

        class MyViewHolder extends RecyclerView.ViewHolder {
            TextView tv;

            public MyViewHolder(View itemView) {
                super(itemView);
                tv = (TextView) itemView.findViewById(R.id.id_num);
            }
        }
    }

    //判断是否显示键盘
    private boolean fun() {
        final boolean[] visible = new boolean[1];
        final View decorView = getWindow().getDecorView();
        decorView.getViewTreeObserver().addOnGlobalLayoutListener(
                new ViewTreeObserver.OnGlobalLayoutListener() {
                    @Override
                    public void onGlobalLayout() {
                        Rect rect = new Rect();
                        decorView.getWindowVisibleDisplayFrame(rect);
                        int displayHeight = rect.bottom - rect.top;
                        int hight = decorView.getHeight();
                        visible[0] = (double) displayHeight / hight < 0.8;
                        LogUtils.e("是否可见：" + visible[0]);
                    }
                });
        return visible[0];
    }
}