ViewSwitcher用法

结合了手势识别

码了一上午有点小收获

问题一：gridview不要再添加布局，否则会报错
问题二：要在gridview中再次添加手势识别，否则只能识别一次

1. Activity代码

package com.phone.hty.myapplication;

import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.GridView;
import android.widget.Toast;
import android.widget.ViewSwitcher;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    public static final int NNMBER_PER_SCREEN = 16;
    private ArrayList<DataItem> mItems = new ArrayList<DataItem>();
    private int screenNo = -1;
    private int screenCount;
    ViewSwitcher mViewSwitcher;
    LayoutInflater mInflater;
    GestureDetector mDetector;


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

        initData();
        initLinster();
        next();


    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return mDetector.onTouchEvent(event);
    }

    public void next() {
        ((GridView) (mViewSwitcher.getNextView()))
                .setAdapter(new MyAdapter(getBaseContext(), mItems, screenNo, screenCount));
        ((GridView) (mViewSwitcher.getNextView())).setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Log.d("hty","----"+screenNo);
                return mDetector.onTouchEvent(event);
            }
        });
    }

    public void previous() {
        ((GridView) (mViewSwitcher.getNextView()))
                .setAdapter(new MyAdapter(getBaseContext(), mItems, screenNo, screenCount));
        ((GridView) (mViewSwitcher.getNextView())).setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                Log.d("hty","----"+screenNo);

                return mDetector.onTouchEvent(event);
            }
        });
    }

    private void initLinster() {
        mDetector = new GestureDetector(this, new GestureDetector.OnGestureListener() {
            @Override
            public boolean onDown(MotionEvent e) {
                return false;
            }

            @Override
            public void onShowPress(MotionEvent e) {

            }

            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return false;
            }

            @Override
            public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
                return false;
            }

            @Override
            public void onLongPress(MotionEvent e) {

            }

            @Override
            public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                if (e1.getRawX() - e2.getRawX() > 10) {

                    if (screenNo < screenCount - 1) {
                        screenNo++;
                        next();
                        mViewSwitcher.showNext();
                        Log.d("hty", "向左划动，下一页"+screenNo);
                    } else {
                        screenNo = -1;
                        Log.d("hty", "已经到达最后，现在冲重新开始");
                        Toast.makeText(getBaseContext(), "已经到达最后，现在冲重新开始",
                                Toast.LENGTH_SHORT).show();
                    }


                }
                if (e2.getRawX() - e1.getRawX() > 10) {
                    if (screenNo > 0) {
                        screenNo--;
                        previous();
                        Log.d("hty", "向右划动，上一页" + screenNo);
                        mViewSwitcher.showPrevious();
                    } else{
                        screenNo = 3;
                        Log.d("hty", "已经到达开始，现在冲转到最后"+screenNo);
                        Toast.makeText(getBaseContext(),"现在到达第一个。重新转到最后一瓶",
                                Toast.LENGTH_SHORT).show();
                    }

                }


                return true;
            }
        });


    }

    private void initData() {
        mInflater = LayoutInflater.from(this);


        TypedArray typedArray = getResources().obtainTypedArray(R.array.image);
        int[] ache_iamge = new int[typedArray.length()];
        for (int i = 0; i < typedArray.length(); i++) {
            ache_iamge[i] = typedArray.getResourceId(i, 0);
        }
        //此步骤待用
      /* String[] stringArray = getResources().getStringArray(R.array.desc); String[] ache_desc = new String[stringArray.length]; for (int i = 0; i < stringArray.length; i++) { ache_desc[i] = stringArray[i]; }*/

        for (int i = 0; i < 50; i++) {
            DataItem item = new DataItem(getResources()
                    .getStringArray(R.array.desc)[i], ache_iamge[i]);
            mItems.add(item);
        }
// 三木运算符第一个是一个boolean值然后是问号true对应的值：然后是flase对应的值
        screenCount = mItems.size() % NNMBER_PER_SCREEN == 0 ? mItems.size() / NNMBER_PER_SCREEN :
                mItems.size() / NNMBER_PER_SCREEN + 1;
        mViewSwitcher = (ViewSwitcher) findViewById(R.id.view_switcher);
        mViewSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
            @Override
            public View makeView() {
                return mInflater.inflate(R.layout.gridview_layout, null);
            }
        });
    }
}

1. 列表内容

Adapter代码

package com.phone.hty.myapplication;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;

/** * 作者：司马啸尘 * 创建日期：2016/3/26 * 描述： */
public class MyAdapter extends BaseAdapter {

    Context mContext;
    ArrayList<DataItem> mItems;
    private int ScreenNo = -1;
    private int ScreenCount;
    private int NUMBER_PER_SCREEN = 16;

    public MyAdapter(Context context, ArrayList<DataItem> items, int screenNo, int screenCount) {
        mContext = context;
        mItems = items;
        ScreenNo = screenNo;
        ScreenCount = screenCount;
    }

    @Override
    public int getCount() {
        if (ScreenNo == ScreenCount - 1 && mItems.size() % NUMBER_PER_SCREEN != 0) {
            System.out.println("-------------------");
            return mItems.size() % NUMBER_PER_SCREEN;
        } else
            return NUMBER_PER_SCREEN;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        viewHolder holder;
        if (convertView == null) {
            convertView = View.inflate(mContext, R.layout.grid_view_item, null);
            holder = new viewHolder();
            holder.mImageView = (ImageView) convertView.findViewById(R.id.imageView);
            holder.mTextView = (TextView) convertView.findViewById(R.id.textView);
            convertView.setTag(holder);
        } else {
            holder = (viewHolder) convertView.getTag();
        }
        holder.mImageView.setImageResource(mItems.get(position).getImage());
        holder.mTextView.setText(mItems.get(position).getDesc());

        return convertView;
    }
}

class viewHolder {
    public ImageView mImageView;
    public TextView mTextView;
}

好玩的是，没时间添加动画了，下午其他view在练习动画吧

周末快乐，图书馆周末的人永远比平时多，今天起晚了，老位置被抢了555