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GridView的功能和用法

2024-07-15 19:11:03   215人阅读

GridView跟ListView的区别：

GridView只有一列的话就是一个ListView

simple：

cell.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <ImageView        android:id="@+id/image1"        android:layout_width="50dp"        android:layout_height="50dp"        android:contentDescription="@string/str_datu" /></LinearLayout>

 

mail.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:gravity="center_horizontal"    android:orientation="vertical"    tools:context="com.crazy.gridview.MainActivity" >    <GridView        android:id="@+id/grid01"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:horizontalSpacing="1pt"        android:numColumns="4"        android:verticalSpacing="1pt" />    <ImageView        android:id="@+id/imageView"        android:layout_width="240dp"        android:layout_height="240dp"        android:layout_gravity="center_horizontal"        android:contentDescription="@string/string_yulan" /></LinearLayout>

 

MainActivity.java：

public class MainActivity extends Activity {    GridView m_gridView;    ImageView m_imageView;    int[] image_ids = new int[] { R.drawable.focus_1, R.drawable.focus_2,            R.drawable.focus_3, R.drawable.focus_4, R.drawable.focus_5,            R.drawable.focus_7, R.drawable.focus_8, R.drawable.focus_9,            R.drawable.focus_10, R.drawable.focus_11, R.drawable.focus_12,            R.drawable.focus_13, R.drawable.focus_14, R.drawable.focus_15,            R.drawable.focus_16 };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 创建list对象，存放的是map        List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>();        for (int i = 0; i < image_ids.length; i++) {            Map<String, Object> item = new HashMap<String, Object>();            item.put("image", image_ids[i]);            listItems.add(item);        }        // 获取显示图片的imageview        m_imageView = (ImageView) findViewById(R.id.imageView);        // 创建一个SimpleAdapter        SimpleAdapter simpleAdapter = new SimpleAdapter(this, listItems,                R.layout.cell, new String[] { "image" },                new int[] { R.id.image1 });        m_gridView = (GridView) findViewById(R.id.grid01);        m_gridView.setAdapter(simpleAdapter);        m_gridView.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                    long arg3) {                // TODO Auto-generated method stub                m_imageView.setImageResource(image_ids[arg2]);            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}

 


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