使用Android 5.0工具栏小部件的ActionBarActivity中未显示片段
当我运行我的应用程序时,MainFragment根本不会显示在扩展ActionBarActivity的活动中。我确实检查了一下,但这并没有帮我解决问题。以下是我的活动和片段: 活动\u main.xml:使用Android 5.0工具栏小部件的ActionBarActivity中未显示片段,android,android-fragments,android-5.0-lollipop,Android,Android Fragments,Android 5.0 Lollipop,当我运行我的应用程序时,MainFragment根本不会显示在扩展ActionBarActivity的活动中。我确实检查了一下,但这并没有帮我解决问题。以下是我的活动和片段: 活动\u main.xml: public class MainActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInsta
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new MainFragment())
.commit();
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
}
public class MainFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
<LinearLayout 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=".MainActivity"
tools:ignore="MergeRootFrame" >
<include layout="@layout/toolbar" />
</LinearLayout>
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity$PlaceholderFragment">
// There are several text views and buttons I will not add to this code,
// but just know that this fragment isn't blank.
</RelativeLayout>
fragment\u main.xml:
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new MainFragment())
.commit();
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
}
public class MainFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
<LinearLayout 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=".MainActivity"
tools:ignore="MergeRootFrame" >
<include layout="@layout/toolbar" />
</LinearLayout>
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity$PlaceholderFragment">
// There are several text views and buttons I will not add to this code,
// but just know that this fragment isn't blank.
</RelativeLayout>
我想我不需要在这里引用任何xml。。。在我扩展ActionBarActivity而不是Activity_main.xml中的Activity之前,一切都很正常
编辑:添加xml以防万一:
活动\u main.xml:
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new MainFragment())
.commit();
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
}
public class MainFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
<LinearLayout 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=".MainActivity"
tools:ignore="MergeRootFrame" >
<include layout="@layout/toolbar" />
</LinearLayout>
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity$PlaceholderFragment">
// There are several text views and buttons I will not add to this code,
// but just know that this fragment isn't blank.
</RelativeLayout>
您需要将getfragmentManager()更改为getSupportFragmentManager() 像这样
getFragmentManager().beginTransaction()
.add(R.id.container, new MainFragment())
.commit();
到
因为ActionBarActivity在supportpackage中,所以您需要getSupportFragmentManager()这样做可能会对您有所帮助
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new MainFragment())
.commit();
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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);
}
}
也许您实际上没有使用v7 appcompat库,在这种情况下,您的
MainActivity
应该扩展FragmentActivity
?另见:
或者,如果您使用的是v7 appcompat库
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new MainFragment())
.commit();
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
...
}
首先检查
main片段中的import
。我肯定是的
import android.app.Fragment;
它应该是支持库
import android.support.v4.app.Fragment;
在main活动中
而不是
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new MainFragment())
.commit();
}
使用
如果minSdkVersion
为7或8大于10则签入清单文件,然后使用android.app.Fragment
中的Activity
和Fragment
android:minSdkVersion="8"
您必须正确地添加appcompat v21
或appcompat v7
库,并使用您添加的库中的主题。我现在找到并使用的一个解决方案是在post()中调用add()
您的工具栏位于片段的顶部。将找到的工具栏视图设置为ActionBar很可能会导致另一个传递布局,从而使片段视图消失(很可能在工具栏下被压扁)
编辑:
问题解决了,但对我来说不起作用
因此,我将发布我的解决方法。我只是禁用工具栏的抽屉指示器,然后再次启用它。因此,工具栏会自动显示箭头。在onCreate(..)中尝试以下代码
@Hareshchelana是新的Android 5.0小部件之一@awkwardgiraffe已经正确地导入了appcompat v7库以及manifestI中的android:minSdkVersion,我意识到了这一点,我应该在我之前的帖子中包含它。执行此操作时,出现“无法解析方法添加(…)”错误。是否确实要在项目属性appcompact库中添加。是的,我确定。我正在使用appcompat v21库进行主题和工具栏等操作,因此我知道我已将其正确添加到项目中。你可以做一件事:文件->新建->其他->选项卡式活动,点击“完成”,查看代码并检查它。我不知道这如何帮助我显示片段,老实说。我需要为我的工具栏扩展ActionBarActivity。@Fadils是的子类。所以这不是问题所在。@awkwardgiraffe您可以通过FragmentActivity
扩展MainActivity
,然后将工具栏的setSupportActionBar
更改为setActionBar
@kaushik。非常感谢。我明白这一点。然而,我们应该只在针对Android 2.1及以上版本时才使用ActionBarActivity@笨拙的长颈鹿你也可以发布你的工具栏xml吗?完全没有显示,这是否意味着应用程序正在运行,但没有显示或没有运行(编译错误)?与amit的帖子相同:当我这样做时,我得到了“无法解析方法添加(…)”错误。你能给我一个解决方案吗?@awkwardgiraffe看到更新的答案。在放置片段之前,请将工具栏设置为actionbar。谢谢!这对我有用。感谢所有帮助过我的人。:)这似乎不适用于旋转,可能是因为片段再次添加时没有post()
引入的延迟。我使用的是工具栏,但我没有抽屉或抽屉指示器。我相信这会帮助其他人。