Java Logcat不';我看不出任何碎片
我正在学习Android中的碎片,我对Logcat有一个问题 我有2个活动和2个片段,以及它们的布局: 玩家活动-玩家碎片/活动玩家-碎片玩家 图书馆活动-图书馆片段/活动库-片段库 我在PlayerFragment中有一个到LibraryActivity的按钮,在那里我将LibraryFragment充气。问题是当我在图书馆时,Logcat不会显示任何东西 这就是我用来调用LibraryActivity的意图(此按钮位于ActivityCreated方法的PlayerFragment中) 图书馆活动:Java Logcat不';我看不出任何碎片,java,android,android-fragments,android-activity,logcat,Java,Android,Android Fragments,Android Activity,Logcat,我正在学习Android中的碎片,我对Logcat有一个问题 我有2个活动和2个片段,以及它们的布局: 玩家活动-玩家碎片/活动玩家-碎片玩家 图书馆活动-图书馆片段/活动库-片段库 我在PlayerFragment中有一个到LibraryActivity的按钮,在那里我将LibraryFragment充气。问题是当我在图书馆时,Logcat不会显示任何东西 这就是我用来调用LibraryActivity的意图(此按钮位于ActivityCreated方法的PlayerFragment中) 图书
public class LibraryActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_library);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.library, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_library,
container, false);
return rootView;
}
}
}
图书馆碎片
public class LibraryFragment extends Fragment {
private final String LOG_TAG = "test";
public LibraryFragment() {
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
Log.v(LOG_TAG, "onAttach");
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.v(LOG_TAG, "onCreate");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_library, container,
false);
Log.v(LOG_TAG, "onCreateViewLibraryFragment");
/*
* Aquí podemos seleccionar las Views contenidas en el Layout para
* trabajar con ellas, por ejemplo con: TipoView miView = (TipoView)
* rootView.findViewById(R.id.miViewXML);
*/
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.v(LOG_TAG, "onActivityCreatedLibraryFragment");
}
@Override
public void onStart() {
super.onStart();
Log.v(LOG_TAG, "onStart");
}
@Override
public void onResume() {
super.onResume();
Log.v(LOG_TAG, "onResume");
}
@Override
public void onPause() {
super.onPause();
Log.v(LOG_TAG, "onPause");
}
@Override
public void onStop() {
super.onStop();
Log.v(LOG_TAG, "onStop");
}
@Override
public void onDestroyView() {
super.onDestroyView();
Log.v(LOG_TAG, "onDestroyView");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.v(LOG_TAG, "onDestroy");
}
@Override
public void onDetach() {
super.onDetach();
Log.v(LOG_TAG, "onDetach");
}
}
这就是我的问题所在
Logcat不显示消息“onActivityCreatedLibraryFragment”。我有onStart()、onResume()、onStop()等方法,它们的“Log.v”也有同样的问题
提前感谢您的帮助
activity_library.xml
<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"
tools:context="com.jgutierrezgil.bmusic.LibraryActivity"
tools:ignore="MergeRootFrame" />
<RelativeLayout 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.jgutierrezgil.bmusic.LibraryActivity$PlaceholderFragment" >
</RelativeLayout>
fragment_library.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.jgutierrezgil.bmusic.LibraryActivity"
tools:ignore="MergeRootFrame" />
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.jgutierrezgil.bmusic.LibraryActivity$PlaceholderFragment" >
</RelativeLayout>
编辑1:我已经完成了LibraryFragment的代码,并且添加了activity_library.xml和fragment_library.xml看起来您从未真正将
LibraryFragment
添加到代码中。您只添加了占位符片段
,这是您所做教程的剩余内容
<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"
tools:context="com.jgutierrezgil.bmusic.LibraryActivity"
tools:ignore="MergeRootFrame" />
<RelativeLayout 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.jgutierrezgil.bmusic.LibraryActivity$PlaceholderFragment" >
</RelativeLayout>
在LibraryActivity
的onCreate()
中,进行以下更改:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_library);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
//.add(R.id.container, new PlaceholderFragment()).commit();
.add(R.id.container, new LibraryFragment()).commit();
}
}
占位符片段
定义在LibraryActivity
的底部,表示为虚拟。显示正确布局的原因是您将占位符片段
的输入布局文件更改为R.layout.fragment\u库
,看起来它膨胀了适当的片段
我认为您无法启动另一个活动,或者您是否?当按钮单击时,您的活动是否发生了更改?如果是,请将您的片段发布在“创建视图代码”上?您可以发布活动库.xml的代码吗?LibraryActivity正确启动,我可以在Logcat中打印来自此类的消息。布局也开始了(我添加了按钮和一些控件来检查),但是LibraryFragment中的代码没有执行。