GridView的stretchMode属性

stretchMode属性值的作用是设置GridView中的条目以什么缩放模式去填充剩余空间。参数stretchMode 可选值为:none,spacingWidth,columnWidth, spacingWidthUniform

注意:spaceWidth和spacingWidthUniform是有差别的，下面通过一个例子说明一下,本人手机屏幕4.7英寸,分辨率为1280×720

1.建立一个Android项目

界面布局文件activity_main.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="test"
     />

    <GridView
        android:id="@+id/gridview1"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:numColumns="3"
        android:columnWidth="80dp"
        android:gravity="center"
        android:horizontalSpacing="8dp"
        android:verticalSpacing="8dp"
        android:stretchMode="none"
     />

</LinearLayout>

字符串文件strings.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">gridviewtest</string>
    <string name="c1">F00</string>
    <string name="c2">0F0</string>
    <string name="c3">00F</string>
    <string name="c4">FF0</string>
    <string name="c5">F0F</string>
    <string name="c6">0FF</string>
    <string name="c7">07F</string>
    <string name="c8">F07</string>
    <string name="c9">70F</string>
</resources>

颜色文件colors.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="c1">#F00</color>
    <color name="c2">#0F0</color>
    <color name="c3">#00F</color>
    <color name="c4">#FF0</color>
    <color name="c5">#F0F</color>
    <color name="c6">#0FF</color>
    <color name="c7">#07F</color>
    <color name="c8">#F07</color>
    <color name="c9">#70F</color>
</resources>

2.编写代码，如下:

public class MainActivity extends Activity {

    int []colors=new int[]
    {
        R.color.c1,R.color.c2,R.color.c3,
        R.color.c4,R.color.c5,R.color.c6,
        R.color.c7,R.color.c8,R.color.c9
    };
    int []texts=new int[]
    {
        R.string.c1,R.string.c2,R.string.c3,
        R.string.c4,R.string.c5,R.string.c6,
        R.string.c7,R.string.c8,R.string.c9
    };
    Button button1;
    GridView gridview1;

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

        button1=(Button)findViewById(R.id.button1);
        gridview1=(GridView)findViewById(R.id.gridview1);

        button1.setOnClickListener(new OnClickListener()
        {
             @Override
             public void  onClick(View v)
             {
                 int width=gridview1.getColumnWidth();
                 int widthSpace=gridview1.getHorizontalSpacing();
                 Toast.makeText(MainActivity.this, "columnWidth:"+width+",widthSpace:"+widthSpace, Toast.LENGTH_LONG).show();
             }

        });

        final BaseAdapter baseAdapter=new BaseAdapter()
        {

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

            @Override
            public Object getItem(int arg0) {
                return getResources().getString(texts[arg0]);
            }

            @Override
            public long getItemId(int arg0) {
                return arg0;
            }

            @Override
            public View getView(int position, View view, ViewGroup viewGroup) {

                TextView textView=new TextView(MainActivity.this);
                textView.setText(getItem(position).toString());
                textView.setTextSize(20);
                textView.setGravity(Gravity.CENTER);
                textView.setBackgroundResource(colors[position]);
                textView.setWidth(60);
                textView.setHeight(60);
                return textView;

            }

        };

        gridview1.setAdapter(baseAdapter);

     }
  }

3.测试

当将界面布局文件中GridView的stretchMode设为none,点击按钮，输出的信息为columnWidth:160,widthSpace:16

当将界面布局文件中GridView的stretchMode设为spacingWidth,点击按钮，输出的信息为columnWidth:160,widthSpace:120

当将界面布局文件中GridView的stretchMode设为columnWidth,点击按钮，输出的信息为columnWidth:229,widthSpace:16

当将界面布局文件中GridView的stretchMode设为spacingWidthUniform,点击按钮，输出的信息为columnWidth:160,widthSpace:68