我试图在工具栏中显示必要的内容(即标题和后退按钮),但由于某种原因没有出现,但 fragment 中的主要内容却出现了。可以采取什么措施来解决这个问题?
MapActivity.java
public class MapActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_map);
SubsamplingScaleImageView imageView = (SubsamplingScaleImageView)findViewById(R.id.imageView);
imageView.setImage(ImageSource.resource(R.drawable.map));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
final Intent intent = NavUtils.getParentActivityIntent(this);
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
NavUtils.navigateUpTo(this, intent);
return true;
}
return false;
}
}
FragmentMap.java
public class FragmentMap extends android.support.v4.app.Fragment {
public FragmentMap() {
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View v = inflater.inflate(R.layout.fragment_map, container, false);
Toolbar toolbar = (Toolbar) v.findViewById(R.id.actionBar);
toolbar.setBackgroundColor(Color.parseColor("#212121"));
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.setSupportActionBar(toolbar);
activity.getSupportActionBar().setTitle(Html.fromHtml("<font color='#FFFFFF'>" + getResources().getString(R.string.map) + "</font>"));
activity.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
activity.getSupportActionBar().setDisplayShowHomeEnabled(false);
return v;
}
}
fragment_map.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/fragmentmap" >
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/actionBar"
android:elevation="4dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentInsetEnd="0dp"
app:contentInsetStart="16dp" >
</android.support.v7.widget.Toolbar>
<com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
styles.xml
<resources>
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
</style>
</resources>
最佳答案
完整代码
map Activity
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class MapActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
Toolbar toolbar = (Toolbar) findViewById(R.id.actionBar);
if (toolbar != null) {
setSupportActionBar(toolbar);
toolbar.setBackgroundColor(Color.parseColor("#212121"));
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(false);
}
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new MapActivityFragment())
.commit();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_map, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case android.R.id.home:
super. onBackPressed();
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_map.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res /android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@color/whiteColor"
android:id="@+id/fragmentmap" >
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/actionBar"
android:elevation="4dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentInsetEnd="0dp"
app:contentInsetStart="16dp" >
</android.support.v7.widget.Toolbar>
<LinearLayout
android:id="@+id/container"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
styles.xml
<style name="AppThemeNew" parent="Theme.AppCompat.NoActionBar">
</style>
MapActivityFragment.java
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A placeholder fragment containing a simple view.
*/
public class MapActivityFragment extends Fragment {
public MapActivityFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_map, container, false);
getActivity().setTitle(Html.fromHtml("<font color='#FFFFFF'>" + "Hello Toolbar" + "</font>"));
return rootView;
}
}
fragment_map.xml
<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:background="@color/whiteColor"
android:paddingBottom="@dimen/activity_vertical_margin">
<TextView android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/blackColor"/>
</RelativeLayout>
关于java - 尽管出现了 fragment 内容,但工具栏内容并未出现,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31515067/