Android实现类似网易新闻选项卡动态滑动效果

最后也就点击选项卡的时候会有一个动态滑动的效果，其实就是利用HorizontalScrollView的smoothScrollTo方法来实现的

 myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
int radioButtOnId= group.getCheckedRadioButtonId();
//根据ID获取RadioButton的实例
RadioButton rb = (RadioButton) findViewById(radioButtonId);
channel = (String) rb.getTag();
mCurrentCheckedRadioLeft = rb.getLeft();//更新当前按钮距离左边的距离
int width=(int) SizeHelper.dp2px(TabbarActivity.this, 140);
hs_activity_tabbar.smoothScrollTo((int) mCurrentCheckedRadioLeft - width, 0);
tv_tabname.setText(channel);
}
});
//设定默认被选中的选项卡为第一项
if (!titleList.isEmpty()) {
myRadioGroup.check(myRadioGroup.getChildAt(0).getId());
}

dp2px方法如下用来将dp转换为px：

 public static float dp2px(Context context, float dp) {
final float scale = context.getResources().getDisplayMetrics().density;
return (dp * scale);
}

全部代码为：

package com.example.liuwangshu.myslidetabbar;
import android.content.res.ColorStateList;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class TabbarActivity extends AppCompatActivity {
private HorizontalScrollView hs_activity_tabbar;
private RadioGroup myRadioGroup;
private List titleList;
private LinearLayout ll_activity_tabbar_content;
private float mCurrentCheckedRadioLeft;//当前被选中的RadioButton距离左侧的距离
private String channel;
private TextView tv_tabname;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabbar);
tv_tabname= (TextView) this.findViewById(R.id.tv_tabname);
titleList = new ArrayList();
titleList.add("推荐");
titleList.add("热点");
titleList.add("北京");
titleList.add("体育");
titleList.add("娱乐");
titleList.add("足球");
titleList.add("巴萨");
titleList.add("汽车");
initGroup();
}
private void initGroup() {
hs_activity_tabbar= (HorizontalScrollView) this.findViewById(R.id.hs_activity_tabbar);
ll_activity_tabbar_cOntent= (LinearLayout) this.findViewById(R.id.ll_activity_tabbar_content);
//选项卡布局
myRadioGroup = new RadioGroup(this);
myRadioGroup.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
myRadioGroup.setOrientation(LinearLayout.HORIZONTAL);
ll_activity_tabbar_content.addView(myRadioGroup);
for (int i = 0; i 

来看看效果