android - Android - 支持库中的片段与 4.3 平台不兼容

Question

我在使用支持库时遇到了一个奇怪的问题。

我想在 2.3.3 平台上制作一个带有片段切换的动态导航选项卡，就像API Demo.

在此处输入图像描述

在 2.3.3 平台上一切正常，但是当我查看 4.3 平台上的相同活动时，我发现有些奇怪。

无法分离片段，SupportFragmentManagement似乎选项卡选择回调没有正确执行；

以下图片显示了我的演示如何进行在此处输入图像描述

这是我的代码：

package net.zengweizhi.android.gettingstarted.lesson05.test;
import net.zengweizhi.android.gettingstarted.R;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

// 使用支持库中的 api

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBar.Tab;
import android.support.v7.app.ActionBar.TabListener;
import android.support.v7.app.ActionBarActivity;

public class NavigationTabsWithFragmentsV9 extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_navigation_tabs, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.actionButton_addTab:
            addTab();
            break;
        case R.id.actionButton_removeTab:
            removeTab();
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

    private int mTabSeq = 0;

    private void addTab(){
        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        mTabSeq++;

        Tab tab = getSupportActionBar().newTab();
        tab.setText("TAB " + mTabSeq);
        tab.setTabListener(new MyTabListener(this));
        getSupportActionBar().addTab(tab);
    }

    private void removeTab(){
        Tab tab = getSupportActionBar().getSelectedTab();
        getSupportActionBar().removeTab(tab);

        Fragment fragment = getSupportFragmentManager().findFragmentByTag(tab.getText().toString());
        getSupportFragmentManager().beginTransaction().remove(fragment).commit();
        if( getSupportActionBar().getTabCount() == 0 ){
            getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        }
    }

    private static final class MyTabListener  implements TabListener {
        private NavigationTabsWithFragmentsV9 mActivity;
        public MyTabListener(NavigationTabsWithFragmentsV9 activity /*,Fragment fragment*/){
            mActivity = activity;
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {
            // Do nothing
        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            Object obj = tab.getTag();
            if( null == obj ){
                Bundle args = new Bundle();
                args.putString(SimpleFragment.EXTRA_OUTPUT_MESSAGE, tab.getText().toString());
                Fragment fragment = Fragment.instantiate(mActivity, SimpleFragment.class.getName(), args);
                ft.add(android.R.id.content, fragment, tab.getText().toString());

                tab.setTag(obj = fragment);
            }

            ft.attach((Fragment)obj);
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            if( null != mActivity.getSupportFragmentManager().findFragmentByTag(tab.getText().toString()) ){
                ft.detach((Fragment)tab.getTag());
            }
        }

    }

    public static final class SimpleFragment extends Fragment {
        public static final String EXTRA_OUTPUT_MESSAGE = "output_message";

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

            String outputMesasge = null;
            if( null != getArguments() ){
                outputMesasge = getArguments().getString(EXTRA_OUTPUT_MESSAGE);
            }
            if( null == outputMesasge || 0 == outputMesasge.trim().length() ){
                outputMesasge = getString(R.string.demo_text);
            }
            TextView textView = (TextView) fragmentView.findViewById(R.id.textView_simpleFragmentOutput);
            textView.setText(outputMesasge);

            return fragmentView;
        }
    }
}

但是当我全部更改support api为时regular api(default platform api)，在 4.3 平台上一切正常（但这个与 2.3.3 平台不兼容）；

在此处输入图像描述

这是代码（除了 ActionBar 和 Fragment API 没有区别）

package net.zengweizhi.android.gettingstarted.lesson05.test;

import net.zengweizhi.android.gettingstarted.R;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

// 使用默认平台的 api（仅在 v11 及更高版本中）

import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.Fragment;
import android.app.FragmentTransaction;

@SuppressLint("NewApi")

public class NavigationTabsWithFragmentsV14 extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_navigation_tabs, menu);
        return super.onCreateOptionsMenu(menu);
    }

    private int mTabSeq = 0;

    private void addTab(){
        getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        mTabSeq++;

        Tab tab = getActionBar().newTab();
        tab.setText("TAB " + mTabSeq);
        tab.setTabListener(new MyTabListener(this));
        getActionBar().addTab(tab);
    }

    private void removeTab(){
        Tab tab = getActionBar().getSelectedTab();
        getActionBar().removeTab(tab);

        Fragment fragment = getFragmentManager().findFragmentByTag(tab.getText().toString());
        getFragmentManager().beginTransaction().remove(fragment).commit();
        if( getActionBar().getTabCount() == 0 ){
            getActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.actionButton_addTab:
            addTab();
            break;
        case R.id.actionButton_removeTab:
            removeTab();
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

    private static final class MyTabListener  implements TabListener {
        private NavigationTabsWithFragmentsV14 mActivity;
        public MyTabListener(NavigationTabsWithFragmentsV14 activity /*,Fragment fragment*/){
            mActivity = activity;
        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {
            // Do nothing
        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {
            Object obj = tab.getTag();
            if( null == obj ){ // initialize fragment to tab
                Bundle args = new Bundle();
                args.putString(SimpleFragment.EXTRA_OUTPUT_MESSAGE, tab.getText().toString());
                Fragment fragment = Fragment.instantiate(mActivity, SimpleFragment.class.getName(), args);
                ft.add(android.R.id.content, fragment, tab.getText().toString());

                tab.setTag(obj = fragment);
            }
            ft.attach((Fragment)obj);
        }

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {
            if( null != mActivity.getFragmentManager().findFragmentByTag(tab.getText().toString()) ){
                ft.detach((Fragment)tab.getTag());
            }
        }
    }

    public static final class SimpleFragment extends Fragment {
        public static final String EXTRA_OUTPUT_MESSAGE = "output_message";

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

            String outputMesasge = null;
            if( null != getArguments() ){
                outputMesasge = getArguments().getString(EXTRA_OUTPUT_MESSAGE);
            }
            if( null == outputMesasge || 0 == outputMesasge.trim().length() ){
                outputMesasge = getString(R.string.demo_text);
            }
            TextView textView = (TextView) fragmentView.findViewById(R.id.textView_simpleFragmentOutput);
            textView.setText(outputMesasge);

            return fragmentView;
        }
    }
}

我可以使用 (values-v14/classes.xml) 和以下代码制作兼容版本

try {
    Class<?> clazz = Class.forName(getString(R.string.class_navigationTabsAndFragmentsActivity));
    startActivity(clazz);
} catch (ClassNotFoundException ex) {
    showTextByToast(ex.getMessage());
}

但我仍然想知道support library版本中发生了什么，有人可以帮我解决这个问题吗？

score 2 · Accepted Answer

2

Google 发布 Nexus 5 和一个新的支持库 (v19)，这个版本修复了这个 bug 在此处输入图像描述

于 2013-10-31T19:18:39.463 回答

android - Android - 支持库中的片段与 4.3 平台不兼容

1 回答 1

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