向主活动添加片段

Question

我正在学习Android Udacity课程，它已经过时了，所以我尝试通过手动添加一个片段到主活动中来更新它。这段代码构建得很好，但是当应用程序启动时，在android monitor中出现了一个很长的错误。

public class MainActivity extends AppCompatActivity {

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

        if(savedInstanceState == null)
        {
            getFragmentManager().beginTransaction().add(R.id.container,new PHFragment()).commit();
        }
    }
}

public class PHFragment extends Fragment
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        View rootView =  inflater.inflate(R.layout.fragment_main, container, false);
        // Inflate the layout for this fragment
        return rootView;
    }
}

XML fragment_main.xml

    <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.athomield.mysunshine.MainActivity"
    android:touchscreenBlocksFocus="false">

    <ListView
        android:id="@+id/listview_forecast"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </ListView>
</FrameLayout>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.athomield.mysunshine.MainActivity"
    android:touchscreenBlocksFocus="false">

</FrameLayout>

list_itemm_forecast.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/list_item_forecast_textview"
    android:gravity="center_vertical"
    >
</TextView>

日志

06-23 11:23:02.878 3095-3095/com.example.athomield。mysunshine W/System:ClassLoader引用了未知路径：/data/app/com.example.athomield。mysunshine-1/lib/x86 06-23 11:23:06.230 3095-3095/com.example.athomield。mysunshine W/System:ClassLoader引用了未知路径：/data/app/com.example.athomield。mysunsine-1/lib/x86 06-23 11:23:06.408 3095-3105/com.example.athomield。mysunshine W/art：暂停所有线程所花费的时间：58.067ms 06-23 11:23:06.417 3095-3105/com.example.athomield。mysunshine I/art：背景粘性并发标记扫描GC释放了13182（1591KB）个AllocSpace对象，9（208KB）个LOS对象，73%空闲，991KB/3MB，暂停64.383ms，总计75.476ms 06-23 11:23:06.509 3095-3095/com.example.athomield。mysunshine W/art：在Android 4.1之前，方法是Android.graphics。PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.UpdatentFilter（android.Graphic.PorterDuff颜色过滤器，android.content.res.ColorStateList，android.Gragics.PorterDuff$模式）会错误地覆盖android.Graphcs.Drwable中的包私有方法。可绘制06-23 11:23:06.685 3095-3101/com.example.athomield。mysunshine W/art：暂停所有线程所花费的时间：29.223ms 06-23 11:23:06.772 3095-3095/com.example.athomield。MySunhine E/FragmentManager:未找到片段PHFragment{ccbb2d0#0 id=0x7f0b0054}06-23 11:23:06.772 3095-3095/com.example.athomield的id 0x7f0b0054（com.execute.athomeld.mysunsine:id/container）的视图。MySunhine E/FragmentManager:活动状态：06-23 11:23:06.773 3095-3095/com.example.athomield。MySunhine E/FragmentManager:Local FragmentActivity b704817状态：06-23 11:23:06.773 3095-3095/com.example.athomield。MySunhine E/FragmentManager:mCreated=false-mresumed=false-mStopped=false-mReallyStopped=false 06-23 11:23:06.773 3095-3095/com.example.athomield。MySunhine E/FragmentManager:mLoadersStarted=false 06-23 11:23:06.773 3095-3095/com.example.athomield。mysunshine E/FragmentManager:FragmentManager杂项状态：06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:mHost=android.support.v4.app.FragmentActivity$HostCallbacks@16b2c906-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:mContainer=android.support.v4.app.FragmentActivity$HostCallbacks@16b2c906-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:mCurState=1 mStateSaved=false mDestroyed=false 06-23 11:23:06.773 3095-3095/com.example.athomield。MySunhine E/FragmentManager:视图层次结构：06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:com.android.internal.policy。电话窗口$DecorView｛4998dce V.E.…0,0-0,0｝06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.widget。线性布局{9ea54ef V.E…..0,0-0,0}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.view。ViewStub{e812bfc G.E…..0,0-0,0#10203a9 android:id/action_mode_bar_stub}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.widget。FrameLayout{94eb285 V.E…..0,0-0,0}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.support.v7.widget。ActionBarOverlayLayout｛8c4b8da V.E....…0,0-0,0#7f0b0043应用程序：id/decor_content_parent｝06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.support.v7.widget。ContentFrameLayout{eb1510b V.E…..0,0-0,0#1020002 android:id/content}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.widget。RelativeLayout{1b30be8 V.E…..0,0-0,0}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.support.v7.widget。AppCompatButton{44cf201 VFED..C..0,0-0,0#7f0b0055 app:id/button}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.support.v7.widget。AppCompatButton{44588a6 VFED..C..0,0-0,0#7f0b0056 app:id/button2}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.support.v7.widget。ActionBarContainer{7a1f2e7 V.ED..0,0-0,0#7f0b0044 app:id/action_bar_container}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.support.v7.widget。工具栏｛da0fe94 V.E…..0,0-0,0#7f0b0045 app:id/action_bar｝06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.widget。TextView{595ad3d V.ED..0,0-0,0}06-23 11:23:06.773 3095-3095/com.example.athomield。mysunsine E/FragmentManager:android.support.v7.widget。ActionBarContextView{5b18932 G.E…..0,0-0,0#7f0b0046 app:id/action_context_bar}06-23 11:23:06.774 3095-3095/com.example.athomield。mysunshine D/AndroidRuntime:关闭虚拟机

                                                                            --------- beginning of crash

06-23 11:23:06.774 3095-3095/com.example.athomield。mysunsine E/AndroidRuntime：致命异常：主进程：com.example.athomield。mysunshine，PID:3095 java.lang.RuntimeException:无法启动活动组件信息｛com.example.athomield.mysunsine/com.execute.athomeld.mySunsine.MainActivity｝：java.lang.IllegalArgumentException：未找到android.app.ActivityThread.PerformLaunActivity上片段PHFragment｛ccbb2d0#id=0x7F0054｝的id 0x7f0b0054（com.exform.athmield.Mysunsine:id/容器）的视图（ActivityThread.java:2416）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2476）在android.app.ActivityThread.-wrap11（activity.java）在andro.app.ActivityThread$H.handleMessage（activiityThreads.java:1344）在andronid.os.Handler.dispatchMessage（Handler.java:102）在andros.os.Looper.loop（Looper.java:148）在andrior.app.Activethread.main（activatyThread:5417）在andRoopjava.lang.reflect.Method。在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:726）在com.android.internals.os.ZygoteInit.main（ZygoteInit.java:616）调用（本机方法），原因是：java.lang.IllegalArgumentException:未找到android.app.FragmentManagerImpl.MoveManager上片段PHFragment的id 0x7f0b0054（com.example.athomield.mySunsine:id/container）的视图。泰特（FragmentManager.java:965）在android.app.FragmentManagerImpl.moveToState（FragmentManager.java:1148）在android.app.BackStackRecord.run（BackStackRecord.java:793）在android.app.FragmentManagerImpl.ExependingActions（fragmentingManager.java:1535）在Android.app.FragmentController.ExecutPendingActions（fragment Controller.java:325）在Android尔.app.Activity.performStart（Activity.java:6252）在android.app.ActivityThread.performLaunchActivity（ActivityThead.java:2379）位于android.app.ActivityThread.HandleLaunchActivitity（Activitythead.java:2476）

Answer 1

确保导入support.v4.app.fragment而不是android.fragment，然后调用getSupportFragmentManager或在构建gradle文件中升级您的min SDK，如果您想使用第二个选项。

Answer 2

您应该改为使用getSupportFragmentManager。这应该能解决你的问题。

更新:看了你的坠机报告后，这是更明显的。您的问题与< code > supportFragementManager 无关。你的问题是膨胀你的碎片的id。添加片段时，使用< code > r . id . fragment _ container 。当您想要动态添加片段时，需要添加< code>viewgroup而不是布局文件名。< code > r . id . fragment _ container view group必须出现在主活动的布局中。例如，它可以是活动框架布局中的另一个框架布局。因此，在加载片段时，您的代码应该是:

getFragmentManager().beginTransaction().add(R.id.fragment_containe,new PHFragment()).commit();

来源 ：Android开发者片段链接

Answer 3

你可以这样走:

import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
.....
  private FragmentTransaction mFragmentTransaction;
  private FragmentManager mFragmentManager;
.....

  mFragmentManager = getSupportFragmentManager();
    mFragmentTransaction = mFragmentManager.beginTransaction();
    mFragmentTransaction.replace(R.id.content_frame, new PhfFragment());
    mFragmentTransaction.commit();