HorizontalScrollView组合RadioGroup,实现点击RadioButton时自动滚动

来源：互联网发布：炒股软件接口编辑：程序博客网时间：2024/04/30 13:59

做开发时用到这个小应用:点击RadioButton时自动滑动到屏幕的中央,java代码如下
[mw_shl_code=java,true]
public class ScrollTextActivity extends Activity {
HorizontalScrollView scrollView;
RadioGroup radio_group;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);

scrollView = (HorizontalScrollView) findViewById(R.id.scrollview);
radio_group = (RadioGroup) findViewById(R.id.radio_group);


//幕
Display d = getWindowManager().getDefaultDisplay();
      DisplayMetrics dm = new DisplayMetrics();
      d.getMetrics(dm);
      final int screenHalf = d.getWidth()/2;//屏幕宽度的一半
radio_group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){

@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {

int scrollX = scrollView.getScrollX();
System.out.println("scrollX----->"+scrollX);
RadioButton rb = (RadioButton) findViewById(checkedId);
int left = rb.getLeft();
int leftScreen = left-scrollX;
scrollView.smoothScrollBy((leftScreen-screenHalf), 0);
}});
}
}[/mw_shl_code]

布局文件main_activity.xml
[mw_shl_code=html,true]<?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" >
<HorizontalScrollView
      android:id="@+id/scrollview"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content" >

      <RadioGroup
         android:gravity="center_vertical"
         android:id="@+id/radio_group"
         android:layout_width="fill_parent"
         android:layout_height="80dip"
         android:orientation="horizontal" >

         <RadioButton
            android:id="@+id/button1"
            android:text="@string/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
         <RadioButton
            android:layout_marginLeft="30dip"
            android:id="@+id/button2"
            android:text="@string/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
         <RadioButton
            android:layout_marginLeft="30dip"
            android:id="@+id/button3"
            android:text="@string/button3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
         <RadioButton
            android:layout_marginLeft="30dip"
            android:id="@+id/button4"
            android:text="@string/button4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
         <RadioButton
            android:layout_marginLeft="30dip"
            android:id="@+id/button5"
            android:text="@string/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

      </RadioGroup>
</HorizontalScrollView>
</LinearLayout>[/mw_shl_code]

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