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我为 Android 4.0 创建了一个带有“Swipe View+Title Strip”导航类型的项目。我想要的是在单击标题或在页面之间滑动时显示不同的页面。例如，我有三个选项卡，每个选项卡都显示不同的网页。我现在如何创建一个简单的 webview 应用程序，它使用 javascript 等加载网页。请有人帮助我修改此代码，以便每次我从这些标题中单击一个选项卡以显示不同的内容。我看到了一些带有 int position 的东西，然后是 switch(position){ case 0, case 1, case 2} 等，但我不知道把这段代码放在哪里。

这是股票代码，有人可以帮我修改吗？我正在搜索这个数周:((。

package com.actionbartest;

import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.content.Context;
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;
etc.

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
public 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) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}




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

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

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

    @Override
    public int getCount() {
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position) {
            case 0: return getString(R.string.title_section1).toUpperCase();
            case 1: return getString(R.string.title_section2).toUpperCase();
            case 2: 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 {
    public DummySectionFragment() {
    }

    public static final String ARG_SECTION_NUMBER = "section_number";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        TextView textView = new TextView(getActivity());
        textView.setGravity(Gravity.CENTER);
        Bundle args = getArguments();
        textView.setText(Integer.toString(args.getInt(ARG_SECTION_NUMBER)));
        return textView;
    }
}
}
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1 回答 1

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例如，您可以在 assets/www 文件夹（index1.html、index2.html、index3.html）中创建 3 个 html 文件，而不是将最后的 onCreateView()从生成文本视图更改为生成 webview，例如：

    WebView mWeb = new WebView(getActivity());
    WebSettings webSettings = mWeb.getSettings();
    webSettings.setJavaScriptEnabled(true);
    mWeb.setVerticalScrollBarEnabled(true);
    Bundle args = getArguments();
mWeb.loadUrl("file:///android_asset/www/index"+args.getInt(ARG_SECTION_NUMBER)+".html");
return mWeb;

这种方法的坏处是当你滑动 webview 时会重新加载。您应该将 onCreateView 设置为仅填充一次视图并防止 webview 在滑动时重新加载，但我不知道如何实现这一点。

我希望阅读这篇文章的人会就如何防止 webviews 在每次成为焦点时重新加载它的部分发表评论。

于 2012-10-02T03:54:06.597 回答