自定义horinatilalview

来源：互联网发布：c语言中函数和编辑：程序博客网时间：2024/06/06 02:24

public class SimplePagerIndicator extends HorizontalScrollView implements View.OnClickListener,ViewPager.OnPageChangeListener {
private ViewPager viewPager;
private LinearLayout linearLayout;

public SimplePagerIndicator(Context context) {
super(context);
}

public SimplePagerIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
}

public SimplePagerIndicator(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

/**
* 对外提供一个方法,设置viewPager
*/
public void setViewPager(ViewPager viewPager){
this.viewPager = viewPager;

linearLayout = new LinearLayout(getContext());
linearLayout.setOrientation(LinearLayout.HORIZONTAL);
this.addView(linearLayout);

//给linearLayout添加条目
for (int i =0;i<viewPager.getAdapter().getCount();i++){
View view = View.inflate(getContext(), R.layout.indicator_layout, null);

//设置点击事件
view.setOnClickListener(this);

//找到控件
TextView text_title = view.findViewById(R.id.text_title);
TextView text_indicator = view.findViewById(R.id.text_indicator);

text_title.setText(viewPager.getAdapter().getPageTitle(i));

if (i == 0){
text_indicator.setVisibility(View.VISIBLE);
//设置标题的颜色
text_title.setTextColor(Color.RED);
}else {
text_indicator.setVisibility(View.INVISIBLE);
text_title.setTextColor(Color.BLACK);
}

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(10,5,10,5);

//把条目添加到linearLayout中
linearLayout.addView(view,layoutParams);

}

}

@Override
public void onClick(View view) {//view代表点击的控件
//遍历linaearLyaout里面的子条目
for (int i = 0;i<linearLayout.getChildCount();i++){

if (view == linearLayout.getChildAt(i)){
//选中viewPager那一页
viewPager.setCurrentItem(i,false);//

}
}
}

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {

for (int i = 0;i<linearLayout.getChildCount();i++){

View view = linearLayout.getChildAt(i);
TextView text_title = view.findViewById(R.id.text_title);
TextView text_indicator = view.findViewById(R.id.text_indicator);

if (i == position){
text_indicator.setVisibility(View.VISIBLE);

//设置标题的颜色
text_title.setTextColor(Color.RED);
//控制scrollView滚动到某个位置
this.smoothScrollTo((int) linearLayout.getChildAt(i).getX()-linearLayout.getChildAt(i).getWidth(),0);
}else {
text_indicator.setVisibility(View.INVISIBLE);
//设置标题的颜色
text_title.setTextColor(Color.BLACK);
}

}
}

@Override
public void onPageScrollStateChanged(int state) {

}

}

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

实现一个frement

public class NewsFragment extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

TextView textView = new TextView(getActivity());

textView.setText(getArguments().getString("title",""));
return textView;
}

public static NewsFragment getInstance(String title){
NewsFragment newsFragment = new NewsFragment();

Bundle bundle = new Bundle();
bundle.putString("title",title);
newsFragment.setArguments(bundle);
return newsFragment;
}
}

-------------------------------------------------------------------------------

public class MainActivity extends AppCompatActivity {

private ProgressView progressView;
private ViewPager viewPager;
private List<String> list;
private SimplePagerIndicator simplePagerIndicator;

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

viewPager = findViewById(R.id.view_pager);
simplePagerIndicator = findViewById(R.id.simple_indicator);

list = new ArrayList<>();
list.add("推荐");
list.add("推荐新闻");
list.add("推荐娱乐");
list.add("推荐歌");
list.add("推荐视频");
list.add("局势");
list.add("军事");
list.add("国际");
list.add("推荐");
list.add("推荐新闻");
list.add("推荐娱乐");
list.add("推荐歌");
list.add("推荐视频");
list.add("局势");
list.add("军事");
list.add("国际");
list.add("推荐");
list.add("推荐新闻");
list.add("推荐娱乐");
list.add("推荐歌");
list.add("推荐视频");
list.add("局势");
list.add("军事");
list.add("国际");

viewPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {

@Override
public CharSequence getPageTitle(int position) {
return list.get(position);
}

@Override
public Fragment getItem(int position) {

return NewsFragment.getInstance(list.get(position));
}

@Override
public int getCount() {
return list.size();
}
});

simplePagerIndicator.setViewPager(viewPager);

//添加监听事件
viewPager.addOnPageChangeListener(simplePagerIndicator);

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