我基于ViewPagerIndicator
.
您基本上会监听页面何时更改并告诉适配器根据当前位置显示不同的页面标题。
如果您有这些示例工作并且您只是替换这两个文件,然后尝试示例 Titles->Default 并且它对我来说很好......
将代码更改为TestFragmentAdapter
这样:
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
看起来像这样的代码(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
}