GridView的基本用法

GridView

GridView依然是BaseAdapter和SimpleAdapter两种实现方法

BaseAdapter的实现类

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;

/** * 作者：司马啸尘 * 创建日期：2016/3/25 * 描述： */
public class MyAdapter extends BaseAdapter {
    private Context context;
    private int[] images;
    private String[] desc;

    public MyAdapter(Context context, int[] images, String[] desc) {
        this.context = context;
        this.images = images;
        this.desc = desc;
    }

    @Override
    public int getCount() {
        return desc.length;
    }

    @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 viewHolder;
        if (convertView == null) {
            convertView = View.inflate(context, R.layout.image, null);
            viewHolder = new ViewHolder();
            viewHolder.mTextView = (TextView) convertView.findViewById(R.id.textViewShow);
            viewHolder.mImageView = (ImageView) convertView.findViewById(R.id.ImageViewShow);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        System.out.println(images[position]);
        viewHolder.mImageView.setImageResource(images[position]);
        viewHolder.mTextView.setText(desc[position]);
        return convertView;
    }
}

final class ViewHolder {
    public ImageView mImageView;
    public TextView mTextView;
}

Activity中GridView的创建

package com.phone.hty.myapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.GridView;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        int[] images = new int[]{
                R.drawable.bomb10, R.drawable.bomb11, R.drawable.bomb12, R.drawable.bomb13,
                R.drawable.bomb14, R.drawable.bomb15, R.drawable.bomb16, R.drawable.bomb9,
                R.drawable.bomb5, R.drawable.bomb6, R.drawable.bomb7, R.drawable.bomb8,
        };
        GridView mGridView = (GridView) findViewById(R.id.gv);
        MyAdapter myAdapter = new MyAdapter(this,images,
                getResources().getStringArray(R.array.desc));
        mGridView.setAdapter(myAdapter);
    }
}

xml文件中字符串数组的定义

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <array name="desc">
        <item>@string/desc1</item>
        <item>@string/desc2</item>
        <item>@string/desc3</item>
        <item>@string/desc4</item>
        <item>@string/desc5</item>
        <item>@string/desc6</item>
        <item>@string/desc7</item>
        <item>@string/desc8</item>
        <item>@string/desc9</item>
        <item>@string/desc10</item>
        <item>@string/desc11</item>
        <item>@string/desc12</item>
    </array>
</resources>

实现结果图

我们添加下监听器并且实现在xml文件中定义Drawable资源数组

更新Activity中的代码

package com.phone.hty.myapplication;

import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        int[] images = new int[]{
                R.drawable.bomb10, R.drawable.bomb11, R.drawable.bomb12, R.drawable.bomb13,
                R.drawable.bomb14, R.drawable.bomb15, R.drawable.bomb16, R.drawable.bomb9,
                R.drawable.bomb5, R.drawable.bomb6, R.drawable.bomb7, R.drawable.bomb8,
        };

        TypedArray typedArray = getResources().obtainTypedArray(R.array.image);
        int[] image  = new int[typedArray.length()];

        for (int i = 0;i<typedArray.length();i++){
            image[i] = typedArray.getResourceId(i,0);
        }

        GridView mGridView = (GridView) findViewById(R.id.gv);
        MyAdapter myAdapter = new MyAdapter(this,image,
                getResources().getStringArray(R.array.desc));
        mGridView.setAdapter(myAdapter);


        mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                switch (position){
                    case 0:
                        System.out.println(position);
                        break;
                    case 1:
                        System.out.println(position);
                        break;
                }
            }
        });
    }
}

其中访问drawable数组的方法代码是

TypedArray typedArray = getResources().obtainTypedArray(R.array.image);
    int[] image  = new int[typedArray.length()];

    for (int i = 0;i<typedArray.length();i++){
        image[i] = typedArray.getResourceId(i,0);
    }