GridView的stretchMode屬性

stretchMode屬性值的作用是設置GridView中的條目以什么縮放模式去填充剩余空間。參數stretchMode 可選值為:none,spacingWidth,columnWidth, spacingWidthUniform

注意:spaceWidth和spacingWidthUniform是有差別的，下面通過一個例子說明一下,本人手機屏幕4.7英寸,分辨率為1280×720

1.建立一個Android項目

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>

顏色文件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.編寫代碼，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.測試

 當將界面布局文件中GridView的stretchMode設為none,點擊按鈕，輸出的信息為columnWidth:160,widthSpace:16

當將界面布局文件中GridView的stretchMode設為spacingWidth,點擊按鈕，輸出的信息為columnWidth:160,widthSpace:120

當將界面布局文件中GridView的stretchMode設為columnWidth,點擊按鈕，輸出的信息為columnWidth:229,widthSpace:16

當將界面布局文件中GridView的stretchMode設為spacingWidthUniform,點擊按鈕，輸出的信息為columnWidth:160,widthSpace:68