Android使用ViewPager实现导航菜单

标签：source   菜单   dex   set   void   tco   oncreate   社会   移动   

首先设置页面的Fragment布局：

public class TabFragment extends ListFragment {
    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        Bundle bundle = getArguments();
        String url = bundle.getString("url");
        List<String> datas = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            datas.add(url + "-------->" + i);
        }
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout
                .simple_list_item_1, datas);
        setListAdapter(adapter);
    }
}
设置ViewPager的适配器

public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
    private String[] urls;

    public MyFragmentPagerAdapter(FragmentManager fm, String[] urls) {
        super(fm);
        this.urls = urls;
    }

    @Override
    public Fragment getItem(int position) {
        Fragment fragment = new TabFragment();
        Bundle bundle = new Bundle();
        bundle.putString("url", urls[position]);
        fragment.setArguments(bundle);
        return fragment;
    }

    @Override
    public int getCount() {
        return urls.length;
    }
}
代码：

public class TabActivity extends AppCompatActivity {
    private ViewPager vp_tab;
    private LinearLayout ll_title;//标题
    private View v_indicator;//指示器
    private int mCurrentIndex = 0;//记录当前位置
    private HorizontalScrollView hsv_tab;
    private String[] titles = {"社会", "军事", "娱乐", "体育", "科技", "本地", "经济", "房产"};
    private String[] urls = {"社会url", "军事url", "娱乐url", "体育url", "科技url", "本地url", "经济url",
            "房产url"};

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

    private void initView() {
        vp_tab = (ViewPager) findViewById(R.id.vp_tab);
        hsv_tab = (HorizontalScrollView) findViewById(R.id.hsv_tab);
        ll_title = (LinearLayout) findViewById(R.id.ll_title);
        v_indicator = findViewById(R.id.v_indicator);
        FragmentPagerAdapter adapter = new MyFragmentPagerAdapter(getSupportFragmentManager(),
                urls);
        vp_tab.setAdapter(adapter);
        initTab();
    }

    private void initTab() {
        int pixels = getResources().getDisplayMetrics().widthPixels;//获取屏幕宽度
        final int titleWidth = pixels / 4;//设置标题宽度
        ViewGroup.LayoutParams params = v_indicator.getLayoutParams();
        params.width = titleWidth;
        v_indicator.setLayoutParams(params);//给指示器设置同样的宽度
        for (int i = 0; i < titles.length; i++) {
            final TextView tv_title = new TextView(this);//设置标题
            tv_title.setText(titles[i]);
            if (i == mCurrentIndex) {
                tv_title.setTextColor(Color.RED);
            }
            tv_title.setWidth(titleWidth);
            tv_title.setGravity(Gravity.CENTER);
            tv_title.setPadding(5, 5, 5, 0);
            tv_title.setTag(i);//将每个标题对应页面的位置记录下来
            //添加点击监听，让ViewPager跟着标题改变而改变
            tv_title.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    vp_tab.setCurrentItem((int) tv_title.getTag(), false);
                }
            });
            ll_title.addView(tv_title);//将标题的TextView添加到LinearLayout中
        }
        vp_tab.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int
                    positionOffsetPixels) {
                LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) v_indicator
                        .getLayoutParams();
                //设置左边距
                params.leftMargin = (int) ((position + positionOffset) * titleWidth);
                v_indicator.setLayoutParams(params);
                //让ScrollView跟随移动
                hsv_tab.scrollTo(params.leftMargin - titleWidth, 0);
            }

            @Override
            public void onPageSelected(int position) {
                //将原本的TextView颜色设置成灰色，
                TextView tv_title = (TextView) ll_title.getChildAt(mCurrentIndex);
                tv_title.setTextColor(Color.GRAY);
                mCurrentIndex = position;//获取当前页面索引
                tv_title = (TextView) ll_title.getChildAt(mCurrentIndex);
                //设置当前的TextView颜色为红色
                tv_title.setTextColor(Color.RED);
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });
    }

}

Android使用ViewPager实现导航菜单

标签：source   菜单   dex   set   void   tco   oncreate   社会   移动   

原文地址：http://www.cnblogs.com/epilogue/p/6146090.html