更改Android Viewpager中的pagetitle

我有一个ViewPager,我在其中使用getPageTitle方法来获取当前页面的标题.

这是适配器代码：

@Override
    public Fragment getItem(int i) {
        details = productData.get(i);
        Fragment fragment = new ProductViewFragment();
        Bundle args = new Bundle();
        args.putInt(ProductViewFragment.ARG_SECTION_NUMBER,i + 1);
        fragment.setArguments(args);
        return fragment;
    }

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

    public CharSequence getPageTitle(int position) 
    {
      return (position+1)+" of "+myData.size();
    }

现在我想更新上一个和下一个片段的页面标题.我想将它们命名为“prevIoUs”和“next”.它也应该在后续页面上动态更新.

我能够获得当前页面标题号.例如,当我查看第5个片段时,当前片段将正确显示标题.在ViewPager的两个角上,它显示左侧的上一页标题编号和右侧的下一页标题编号.现在,我希望左侧的“上一个”和右侧的“下一个”页面标题类似于Gmail应用程序以及它如何显示ViewPager中的邮件计数.

我想知道的主要内容是如何从Gmail应用程序中访问/修改当前片段中下一个/上一个片段的页面标题数据？

解决方法

我的基础是ViewPagerIndicator附带的样本.

您基本上在页面更改时监听,并告诉适配器根据当前位置显示不同的页面标题.

如果你有这些样本工作,你只需要替换这两个文件,然后尝试样本标题 – >默认,它对我来说工作正常…

更改了TestFragmentAdapter的代码,如下所示：

package com.viewpagerindicator.sample;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import com.viewpagerindicator.IconPagerAdapter;

class TestFragmentAdapter extends FragmentPagerAdapter implements IconPagerAdapter {
    protected static final String[] CONTENT = new String[] { "This","Is","A","Test",};
    protected static final int[] ICONS = new int[] {
            R.drawable.perm_group_calendar,R.drawable.perm_group_camera,R.drawable.perm_group_device_alarms,R.drawable.perm_group_location
    };

    private int mCount = CONTENT.length;

    // CHANGE STARTS HERE
    private int current_position=0;

    public void set_current_position(int i) {
        current_position = i;
    }
    // CHANGE ENDS HERE

    public TestFragmentAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return TestFragment.newInstance(CONTENT[position % CONTENT.length]);
    }

    @Override
    public int getCount() {
        return mCount;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        // CHANGE STARTS HERE
        if (position == current_position-1) {
            return "PrevIoUs";
        } else if (position == current_position+1) {
            return "Next";
        }
        // CHANGE ENDS HERE
        return TestFragmentAdapter.CONTENT[position % CONTENT.length];
    }

    @Override
    public int getIconResId(int index) {
      return ICONS[index % ICONS.length];
    }

    public void setCount(int count) {
        if (count > 0 && count <= 10) {
            mCount = count;
            notifyDataSetChanged();
        }
    }
}

SampleTitlesDefault的代码如下所示(添加了OnPageChangeListener)

package com.viewpagerindicator.sample;

import android.os.Bundle;
import android.support.v4.view.ViewPager;

import com.viewpagerindicator.TitlePageIndicator;

// CHANGE ADDED implements.... HERE
public class SampleTitlesDefault extends BaseSampleActivity implements ViewPager.OnPageChangeListener {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.simple_titles);

        mAdapter = new TestFragmentAdapter(getSupportFragmentManager());

        mPager = (ViewPager)findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);

        mIndicator = (TitlePageIndicator)findViewById(R.id.indicator);
        mIndicator.setViewPager(mPager);
        // CHANGE STARTS HERE
        mIndicator.setOnPageChangeListener(this);
        // CHANGE ENDS HERE
    }

    // CHANGE STARTS HERE
    @Override
    public void onPageScrolled(int i,float v,int i1) {
    }

    @Override
    public void onPageSelected(int i) {
        mPager = (ViewPager)findViewById(R.id.pager);
        ((TestFragmentAdapter)mPager.getAdapter()).set_current_position(i);
    }

    @Override
    public void onPageScrollStateChanged(int i) {
    }
    // CHANGE ENDS HERE
}

更改Android Viewpager中的pagetitle

解决方法

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