0

因此,我开始尝试使用 Scrollable Tabs + Swipe 导航类型。我设法更改了要膨胀的活动,但是所有选项卡上都显示了相同的活动。

如何使每个选项卡上都有不同的活动?我是Android开发的新手,所以请简单解释一下。

我正在使用 Eclipse 中包含的默认模板。

提前致谢!

MainActivity.java:

package com.heavyfork.slidetest;

import java.util.Locale;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.NavUtils;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MainActivity extends FragmentActivity {

/**
 * The {@link android.support.v4.view.PagerAdapter} that will provide
 * fragments for each of the sections. We use a
 * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
 * will keep every loaded fragment in memory. If this becomes too memory
 * intensive, it may be best to switch to a
 * {@link android.support.v4.app.FragmentStatePagerAdapter}.
 */
SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */
ViewPager mViewPager;

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

    // Create the adapter that will return a fragment for each of the three
    // primary sections of the app.
    mSectionsPagerAdapter = new SectionsPagerAdapter(
            getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

/**
 * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
public class SectionsPagerAdapter extends FragmentPagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a DummySectionFragment (defined as a static inner class
        // below) with the page number as its lone argument.
        Fragment fragment = new DummySectionFragment();
        Bundle args = new Bundle();
        args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return 8;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        Locale l = Locale.getDefault();
        switch (position) {

        case 0:
            return getString(R.string.preparations).toUpperCase(l);
        case 1:
            return getString(R.string.title_section1).toUpperCase(l);
        case 2:
            return getString(R.string.title_section2).toUpperCase(l);
        case 3:
            return getString(R.string.title_section3).toUpperCase();

        }
        return null;
    }
}

/**
 * A dummy fragment representing a section of the app, but that simply
 * displays dummy text.
 */
public static class DummySectionFragment extends Fragment {
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    public static final String ARG_SECTION_NUMBER = "section_number";

    public DummySectionFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_picture_display,
                container, false);


        return rootView;
    }
}

}
4

1 回答 1

0

您是新手,所以我将尝试解释示例项目的工作原理。首先你说的是Activity,但是需要用到Fragment。活动只是一个或多个片段的宿主。

该活动仅显示一个 ViewPager,用于显示一些片段(或视图)并启用从一个到另一个的滑动。SectionsPagerAdapter 像 Android 中的所有 Adapter 对象一样工作,您创建一个,给它一些数据(即:国家/地区的 ArrayList),您实现一些方法,包括 getView 或在本例中为 getItem 方法。在这些方法中,您将获得 ViewPager 中的位置,因此您可以访问正确的数据并通过 Bundle 对象将其提供给您的 Fragment(在此示例中完成,位置 +1)。

要提供数据,请使用:

            VisuFragment fragment = new VisuFragment();
            Bundle args = new Bundle();
            args.putInt("id", id);
            fragment.setArguments(args);
            return fragment;

并从 Fragment 的 onCreate 方法中获取它:

            int id = getArguments().getInt("id");

ViewPager 和 Adpater 将管理屏幕上的所有内容,它会在您不知情的情况下要求新的 Fragment 并删除旧的 Fragment。

对于示例代码,如果您想在每个页面上看到不同的内容,请删除 onCreateView 方法的所有内容并放入:

            TextView tv = new TextView(getActivity().getApplicationContext());
            tv.setText("This is fragment number : "+getArguments().getInt(DummySectionFragment.ARG_SECTION_NUMBER);
            return tv;
于 2013-05-19T18:12:36.750 回答