Android Fragments 在方向更改时创建重复的 TextView
我正在尝试制作一个非常简单的应用程序,但有一个错误我无法摆脱它。也许有人可以帮助我。
我正在制作一个带有 ActionBar 和 3 个选项卡的 Activity。选项卡下方是一个 FrameLayout,我将带有 TextView 的 Fragment 放置在其中。因此,当单击选项卡时,TextView 的内容应该发生变化。 在我改变方向之前,这一切都很好。更改后有一个重复的 TextView,我不知道它来自哪里。这是为了更好地理解的图片: 重叠的 TextViews
这是我的活动:
package com.test;
import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.app.ActionBar.Tab;
import android.os.Bundle;
import android.widget.Toast;
public class ProblemActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ActionBar bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
String tab1 = "First Tab";
bar.addTab(bar
.newTab()
.setText(tab1)
.setTabListener(
new TabListener(new First())));
String tab2 = "Second Tab";
bar.addTab(bar
.newTab()
.setText(tab2)
.setTabListener(
new TabListener(new Second())));
String tab3 = "Third Tab";
bar.addTab(bar
.newTab()
.setText(tab3)
.setTabListener(
new TabListener(new Third())));
}
private class TabListener implements ActionBar.TabListener {
private MyFragment mFragment;
public TabListener(MyFragment fragment) {
this.mFragment = fragment;
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.add(R.id.fragment_content, mFragment, null);
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(mFragment);
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
Toast.makeText(ProblemActivity.this, "Reselected!", Toast.LENGTH_SHORT)
.show();
}
}
}
片段的:
public class First extends MyFragment {
public First() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View fragView = inflater.inflate(R.layout.tab1, container, false);
TextView tv = (TextView) fragView.findViewById(R.id.textView1);
tv.setText("First Tab");
return fragView;
}
main.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" >
<FrameLayout
android:id="@+id/fragment_content"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
以及 Fragment's.xml 的内容:
<?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" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="TextView"
android:textSize="35dp" />
</LinearLayout>
如果有人能告诉我我做错了什么,那就太好了。 提前致谢!
编辑:我已经尝试过 这个建议的解决方案 但我想使用类对象,以便我可以使用它们的方法。
Edit2:现在解决了问题。将 android:configChanges="keyboardHidden|orientation|screenSize"
添加到我的 Activity 就足够了。
I am trying to make a very simple App, but there's an error I can't get rid of it. Maybe someone can help me.
I'm making an Activity with an ActionBar and 3 Tabs. Beneath the Tabs is a FrameLayout, where I put Fragments with a TextView in it. So when clicking on a tab the content of the TextView shoud change.
This works fine until I change the orientation. After the change there is a duplicate TextView and I have no idea where it cames from. Here's a picture for better understanding:
Overlapping TextViews
Here's my Activity:
package com.test;
import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.app.ActionBar.Tab;
import android.os.Bundle;
import android.widget.Toast;
public class ProblemActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ActionBar bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
String tab1 = "First Tab";
bar.addTab(bar
.newTab()
.setText(tab1)
.setTabListener(
new TabListener(new First())));
String tab2 = "Second Tab";
bar.addTab(bar
.newTab()
.setText(tab2)
.setTabListener(
new TabListener(new Second())));
String tab3 = "Third Tab";
bar.addTab(bar
.newTab()
.setText(tab3)
.setTabListener(
new TabListener(new Third())));
}
private class TabListener implements ActionBar.TabListener {
private MyFragment mFragment;
public TabListener(MyFragment fragment) {
this.mFragment = fragment;
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.add(R.id.fragment_content, mFragment, null);
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(mFragment);
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
Toast.makeText(ProblemActivity.this, "Reselected!", Toast.LENGTH_SHORT)
.show();
}
}
}
The Fragment's:
public class First extends MyFragment {
public First() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View fragView = inflater.inflate(R.layout.tab1, container, false);
TextView tv = (TextView) fragView.findViewById(R.id.textView1);
tv.setText("First Tab");
return fragView;
}
}
main.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" >
<FrameLayout
android:id="@+id/fragment_content"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
and the content of the Fragment's.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" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="TextView"
android:textSize="35dp" />
</LinearLayout>
It would be amazing if some could show me what I'm making wrong.
Thank's in advance!
Edit: I tried already this proposed solution but I would like to work with class Objects, so that I can use their Methods.
Edit2: Solved the problem now. It was sufficient to add android:configChanges="keyboardHidden|orientation|screenSize"
to my Activity.
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由于OP已经解决了他的问题,但已经有近一年没有在SO上活跃了,这里有一个包含解决方案的答案:
将以下内容添加到
Activity
解决了问题:Since the OP already solved his problem, but hasn't been active on SO for almost a year, here is an answer containing the solution:
Adding the following to the
Activity
solved the problem:如果您的布局之一有问题,您可能会得到重叠的视图。如果您有片段,这种情况似乎尤其会发生。例如,片段中的视图可以与包含布局中的视图重叠。
有时这可以通过清理项目来解决(如果您使用的是 Eclipse)。
You can get overlapping views if there is something wrong with one of your layouts. This seems to happen in particular if you have a fragment. For example, a View in the Fragment can overlap a View in the containing layout.
Sometimes this can be fixed by Cleaning your project (if you are using Eclipse).