Android实现类似网易新闻选项卡动态滑动效果

<code class="hljs avrasm"> @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_tabbar);tv_tabname= (TextView) this.findViewById(R.id.tv_tabname);titleList = new ArrayList<string>();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");}</string></code>

<code class="hljs avrasm">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 < titleList.size(); i++) {String channel = titleList.get(i);RadioButton radio = new RadioButton(this);radio.setButtonDrawable(android.R.color.transparent);radio.setBackgroundResource(R.drawable.radiobtn_selector);ColorStateList csl = getResources().getColorStateList(R.color.radiobtn_text_color);radio.setTextColor(csl);LinearLayout.LayoutParams l = new LinearLayout.LayoutParams((int) SizeHelper.dp2px(this, 80), ViewGroup.LayoutParams.MATCH_PARENT, Gravity.CENTER);radio.setLayoutParams(l);radio.setTextSize(15);radio.setGravity(Gravity.CENTER);radio.setText(channel);radio.setTag(channel);myRadioGroup.addView(radio);}</code>

<code class="hljs cs"> myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {@Overridepublic 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());}</code>

<code class="hljs java"> public static float dp2px(Context context, float dp) {final float scale = context.getResources().getDisplayMetrics().density;return (dp * scale);}</code>

<code class="hljs avrasm">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<string> 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;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_tabbar);tv_tabname= (TextView) this.findViewById(R.id.tv_tabname);titleList = new ArrayList<string>();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 < titleList.size(); i++) {String channel = titleList.get(i);RadioButton radio = new RadioButton(this);radio.setButtonDrawable(android.R.color.transparent);radio.setBackgroundResource(R.drawable.radiobtn_selector);ColorStateList csl = getResources().getColorStateList(R.color.radiobtn_text_color);radio.setTextColor(csl);LinearLayout.LayoutParams l = new LinearLayout.LayoutParams((int) SizeHelper.dp2px(this, 80), ViewGroup.LayoutParams.MATCH_PARENT, Gravity.CENTER);radio.setLayoutParams(l);radio.setTextSize(15);radio.setGravity(Gravity.CENTER);radio.setText(channel);radio.setTag(channel);myRadioGroup.addView(radio);}myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {@Overridepublic 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());}}}</string></string></code>