片段隐式地两次进入后栈

时间：2013-09-16 13:20:12

标签： android android-fragments

我有几个片段，如下所示：

MainActivity包含MainFragment和WebFragment（只是一个内部包含webview的片段）：

 <FrameLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@android:id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <fragment
            android:id="@+id/main_fragment"
            android:name="com.citylifeapps.cups.MainFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

        <fragment
            android:id="@+id/venue_fragment"
            android:name="com.citylifeapps.cups.WebFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </fragment>

 </FrameLayout>

MainFragment包含ListFragment和MapFragment：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/map_fragment"
        android:name="com.citylifeapps.cups.MapFragment"
        android:layout_width="match_parent"
        android:layout_height="fill_parent" />

    <fragment
        android:id="@id/list_fragment"
        android:name="com.citylifeapps.cups.ListFragment"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent" />

</RelativeLayout>

我的问题是以下情况：

  1. 启动应用，MainFragment从同一屏幕中的地图和列表开始
  2. 点击列表项，WebFragment打开
  3. 点击返回，MainFragment出现 - 正如预期的那样
  4. 点击另一个 - 再次显示WebFragment

    5. 最后一步（4）是问题所在。预期的行为是来自MainFragment（步骤3），单击返回将关闭应用程序，因为它是链中的最高点。

    我认为后面的堆栈出错了，

    我正在尝试调试它，但调试非常困难。

    这是FragmentManager日志：

    // Step 1

09-16 16:00:15.683: D/FragmentManager(22278):     Op #0: HIDE WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:15.683: D/FragmentManager(22278):     Op #1: SHOW MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:15.733: V/FragmentManager(22278): moveto ACTIVITY_CREATED: MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:15.733: V/FragmentManager(22278): moveto ACTIVITY_CREATED: MapFragment{41e68c60 #1 id=0x7f05002a}
09-16 16:00:15.733: V/FragmentManager(22278): moveto ACTIVITY_CREATED: SupportMapFragment{41e6adc8 #2 id=0x7f050084}
09-16 16:00:15.733: V/FragmentManager(22278): moveto ACTIVITY_CREATED: ListFragment{42058380 #3 id=0x7f05002b}
09-16 16:00:15.733: V/FragmentManager(22278): moveto ACTIVITY_CREATED: WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:15.733: V/FragmentManager(22278): hide: WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:15.733: V/FragmentManager(22278): show: MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:15.733: V/FragmentManager(22278): moveto STARTED: MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:15.733: V/FragmentManager(22278): moveto STARTED: MapFragment{41e68c60 #1 id=0x7f05002a}
09-16 16:00:15.733: V/FragmentManager(22278): moveto STARTED: SupportMapFragment{41e6adc8 #2 id=0x7f050084}
09-16 16:00:15.733: V/FragmentManager(22278): moveto STARTED: ListFragment{42058380 #3 id=0x7f05002b}
09-16 16:00:15.733: V/FragmentManager(22278): moveto STARTED: WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:15.733: V/FragmentManager(22278): moveto RESUMED: MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:15.733: V/FragmentManager(22278): moveto RESUMED: MapFragment{41e68c60 #1 id=0x7f05002a}
09-16 16:00:15.733: V/FragmentManager(22278): moveto RESUMED: SupportMapFragment{41e6adc8 #2 id=0x7f050084}
09-16 16:00:15.743: V/FragmentManager(22278): moveto RESUMED: ListFragment{42058380 #3 id=0x7f05002b}
09-16 16:00:15.743: V/FragmentManager(22278): moveto RESUMED: WebFragment{42037ea8 #4 id=0x7f050082}

// Step 2

09-16 16:00:28.967: D/FragmentManager(22278):     Op #0: SHOW MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:28.967: D/FragmentManager(22278):     Op #1: HIDE WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:28.977: D/FragmentManager(22278):     Op #0: HIDE MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:28.977: D/FragmentManager(22278):     Op #1: SHOW WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:28.977: V/FragmentManager(22278): Bump nesting of MainFragment{41e678a0 #0 id=0x7f050081} to 1
09-16 16:00:28.977: V/FragmentManager(22278): Bump nesting of WebFragment{42037ea8 #4 id=0x7f050082} to 1
09-16 16:00:28.977: V/FragmentManager(22278): show: MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:28.977: V/FragmentManager(22278): hide: WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:28.977: V/FragmentManager(22278): Bump nesting of MainFragment{41e678a0 #0 id=0x7f050081} to 2
09-16 16:00:28.977: V/FragmentManager(22278): Bump nesting of WebFragment{42037ea8 #4 id=0x7f050082} to 2
09-16 16:00:28.977: V/FragmentManager(22278): hide: MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:28.997: V/FragmentManager(22278): show: WebFragment{42037ea8 #4 id=0x7f050082}

// Step 3

09-16 16:00:39.238: D/FragmentManager(22278):     Op #0: HIDE MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:39.238: D/FragmentManager(22278):     Op #1: SHOW WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:39.238: V/FragmentManager(22278): Bump nesting of MainFragment{41e678a0 #0 id=0x7f050081} to 1
09-16 16:00:39.238: V/FragmentManager(22278): Bump nesting of WebFragment{42037ea8 #4 id=0x7f050082} to 1
09-16 16:00:39.238: V/FragmentManager(22278): hide: WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:39.238: V/FragmentManager(22278): show: MainFragment{41e678a0 #0 id=0x7f050081}

// Step 4

09-16 16:00:53.724: D/FragmentManager(22278):     Op #0: SHOW MainFragment{41e678a0 #0 id=0x7f050081}
09-16 16:00:53.724: D/FragmentManager(22278):     Op #1: HIDE WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:53.724: V/FragmentManager(22278): Bump nesting of MainFragment{41e678a0 #0 id=0x7f050081} to 0
09-16 16:00:53.724: V/FragmentManager(22278): Bump nesting of WebFragment{42037ea8 #4 id=0x7f050082} to 0
09-16 16:00:53.724: V/FragmentManager(22278): show: WebFragment{42037ea8 #4 id=0x7f050082}
09-16 16:00:53.724: V/FragmentManager(22278): hide: MainFragment{41e678a0 #0 id=0x7f050081}

    我不明白什么是错的，我唯一一次将WebFragment添加到后台堆栈是我单击列表项并在步骤2中打开它。另外我假设调用super.onBackPressed()弹回后面堆叠。

    以下是我的代码的简化版本：

    public class MainActivity extends ActionBarActivity {

    private boolean venueOrMapPageVisible = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main_activity);

        FragmentManager.enableDebugLogging(true);
        getSupportFragmentManager().beginTransaction()
        .hide(getVenueFragment())
        .show(getMainFragment())
        .commit();

    }

    @Override
    public void onBackPressed() {

        overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right);
        if (venueOrMapPageVisible) {
            setDrawerIndicatorEnabled(true);
            venueOrMapPageVisible = false;
        }
        super.onBackPressed();

    }



    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (super.onOptionsItemSelected(item)) {
          return true;
        }

        switch (item.getItemId()) {
        case android.R.id.home:
            if (venueOrMapPageVisible) {
                onBackPressed();
            }
            break;


        return false;
    }



    // called when a venue is clicked
    @Override
    public void onItemClick(JSONObject venue) {

        if (venue != null) {
            String vid = null;
            try {
                vid = venue.getString("key");
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            openVenue(vid);
        }
    }


    private void openVenue(String vid) {
        getVenueFragment().loadUrl(Consts.venueUri(vid));

        MainActivity.this
                .getSupportFragmentManager().beginTransaction().setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left, R.anim.slide_in_left, R.anim.slide_out_right)
                .hide(getMainFragment())
                .show(getVenueFragment())
                .addToBackStack(null)
                .commit();
        venueOrMapPageVisible = true;

        // analytics open venue start time (set it only once)
        if (CupsTracker.venueStartTime == 0L) {
            CupsTracker.venueStartTime = System.currentTimeMillis();
        }
    }


    private WebFragment getVenueFragment() {
        return (WebFragment) getSupportFragmentManager().findFragmentById(R.id.venue_fragment);
    }

    private MainFragment getMainFragment() {
        return (MainFragment) getSupportFragmentManager().findFragmentById(R.id.main_fragment);
    }




    public void moveToMapFragment() {
        MapFragment mapFragment = (MapFragment) getSupportFragmentManager().findFragmentById(R.id.map_fragment);
        ListFragment listFragment = (ListFragment) getSupportFragmentManager().findFragmentById(R.id.list_fragment);
        getSupportFragmentManager()
        .beginTransaction()
        .setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left, R.anim.slide_in_left, R.anim.slide_out_right)
        .hide(listFragment)
        .addToBackStack(null)
        .commit();
        mapFragment.getView().setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        venueOrMapPageVisible = true;

    }

}

    我怀疑由于MainActivity布局文件包含MainFragment和WebFragment，当它被夸大时，WebFragment会以某种方式隐式添加到后台堆栈或其他东西。有可能吗？

0 个答案:

没有答案
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