九宫格

使用GridView和SimpleAdapter实现手机界面常见的九宫格，图片可以任意选择，注意图片的大小要一致

主界面代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="cn.edu.niit.myapplication5.MainActivity">

    <GridView
        android:id="@+id/gv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:horizontalSpacing="10dp"
        android:layout_gravity="center"
        android:numColumns="3"
        android:verticalSpacing="5dp"
        android:stretchMode="columnWidth">

    </GridView>
</LinearLayout>
item代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<?xml version="1.0" encoding="utf-8"?>
<ImageView
    android:layout_width="140dp"
    android:layout_height="170dp"
    android:id="@+id/photo"/>

</LinearLayout>
java部分代码：

package cn.edu.niit.myapplication5;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;

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



public class MainActivity extends AppCompatActivity {
    private GridView gridView;
    private SimpleAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gridView = (GridView) findViewById(R.id.gv);
        adapter = new SimpleAdapter(this, getData(),
                R.layout.activity_item,
                new String[]{"photo"},
                new int[]{R.id.photo});

        gridView = (GridView) findViewById(R.id.gv);
        gridView.setAdapter(adapter);

        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
                String data = (String) adapterView.getItemAtPosition(position);
            }
        });
    }

    private List<HashMap<String, Object>> getData() {
        List<HashMap<String, Object>> datas = new ArrayList<>();

        HashMap<String, Object> data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        data = new HashMap<>();
        data.put("photo", R.drawable.photo);
        datas.add(data);

        return datas;
    }

}