问题描述
我有一个活动（主），这表明标签是这样的：
I have an Activity (Main) which shows tabs like this:
private void initTabs(){
mTabHost = getTabHost(); // The activity TabHost
Intent intent;
intent = new Intent().setClass(this, MyGroup.class);
setupTab(intent, "tab");
}
private void setupTab(Intent intent, final String tag) {
View tabview = createTabView(mTabHost.getContext(), tag);
TabSpec setContent = mTabHost.newTabSpec(tag).setIndicator(tabview).setContent(intent);
mTabHost.addTab(setContent);
}
private static View createTabView(final Context context, final String text) {
View view = LayoutInflater.from(context).inflate(R.layout.tabs_bg, null);
((TextView) view.findViewById(R.id.tabsText)).setText(text);
return view;
}
在 MYGROUP 类是一个的ActivityGroup，它执行以下操作：
The MyGroup class is an ActivityGroup, which does the following:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View view = getLocalActivityManager().startActivity("activityA", new Intent(this, ActivityA.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();
this.setContentView(view);
state = A;
}
public void openB() {
Intent i = new Intent(this, ActivityB.class);
View view = getLocalActivityManager().startActivity("activityB", i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView();
this.setContentView(view);
state = B;
}
所以主有一个 MYGROUP 标签。该 MYGROUP 开始 ActivityA 键，然后进入 ActivityB 。当我美元的 ActivityB 点$ PSS后退按钮，我想回去 ActivityA ，并在回$在 ActivityA 点$ PSS我想关闭该应用程序。
So Main has a tab with a MyGroup. The MyGroup starts with ActivityA and then goes to ActivityB. When I press the back button in ActivityB, I want to go back to ActivityA, and on back press in ActivityA I want to close the app.
这是我是如何做到这一点。在 ActivityB ：
This is how I've done that. In ActivityB:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
System.out.println("ActivityB PRESSED");
if (keyCode == KeyEvent.KEYCODE_BACK) {
MyGroup mg = (MyGroup) getParent();
return mg.onKeyDown(keyCode, event);
}
return super.onKeyDown(keyCode, event);
}
在 ActivityA 相同的：
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
System.out.println("ActivityA PRESSED");
if (keyCode == KeyEvent.KEYCODE_BACK) {
MyGroup mg = (MyGroup) getParent();
return mg.onKeyDown(keyCode, event);
}
return super.onKeyDown(keyCode, event);
}
现在，在 MYGROUP ：
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
System.out.println("MG PRESSED");
if (state == A)
return false;
else if (state == B) {
setContentView(getLocalActivityManager().startActivity("activityA", new Intent(this, ActivityA.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)).getDecorView());
state = A;
return true;
}
return false;
}
return super.onKeyDown(keyCode, event);
}
最后，在主，只是一个System.out的：
Finally, in Main, just a system.out:
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
System.out.println("MAIN PRESSED");
return super.onKeyDown(keyCode, event);
}
现在，这是我目前的行为，我不想要的：
Now this is my current behavior, which I don't want:
- 当应用程序启动后，我在ActivityA。后退按钮 - >应用程序关闭。确定。
- 当应用程序启动后，ActivityA - > ActivityB - >后退按钮 - > ActivityA。确定。
- 当应用程序启动后，ActivityA - > ActivityB - >返回 - > ActivityA - >ActivityB - >返回 - >应用程序关闭。也不行！
- When app started, I'm in ActivityA. Backbutton -> app closes. OK.
- When app started, ActivityA -> ActivityB -> Back button -> ActivityA. OK.
- When app started, ActivityA -> ActivityB -> Back -> ActivityA ->ActivityB -> Back -> app closes. NOT OK!
显然，第二次ActivityB显示，后退按钮是由主，而不是 ActivityB 处理或 MYGROUP 。
Apparently, the second time ActivityB is shown, the back button is being handled by Main, instead of ActivityB or MyGroup.
我该如何解决这个问题？
How can I fix this?
修改
我添加了一个ActivityC。这似乎是在头两个活动的行为是正常的，从第三上的主活动处理的按钮preSS。
I've added an ActivityC. It seems like behaviour in the first two activities is normal, and from the third on, the Main activity handles the button press.
所以，A - > B - > A是被处理 - > B - >主
So A -> B -> A is handled by A -> B -> Main
和A - > B - > C由一个处理 - > B - >主
and A -> B -> C is handled by A -> B -> Main.
推荐答案
于是，我找到了答案。
我在主要，这似乎是这个问题的原因是AdMob的AD浏览报。这是XML：
I have an admob adview in my Main, which seems the cause of this problem. This is the xml:
<?xml version="1.0" encoding="utf-8"?>
<TabHost
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="0dp">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true" />
<com.google.ads.AdView
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adUnitId="@string/adkey"
ads:adSize="BANNER"
ads:loadAdOnCreate="false"
android:layout_alignParentBottom="true"
android:focusable="false"/>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@id/adView"
android:layout_below="@android:id/tabs" />
</RelativeLayout>
</TabHost>
当我删除AD浏览报，不会出现问题。
When I remove the adview, the problem doesn't occur.
现在要解决这个问题，我已经将XML变成这样：
Now to solve this, I've changed the xml into this:
<?xml version="1.0" encoding="utf-8"?>
<TabHost
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="0dp">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true" />
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@android:id/tabs" />
</RelativeLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<com.google.ads.AdView
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adUnitId="@string/adkey"
ads:adSize="BANNER"
ads:loadAdOnCreate="false"
android:layout_alignParentBottom="true"
android:focusable="false" />
</RelativeLayout>
</FrameLayout>
</TabHost>
这篇关于有标签和的ActivityGroup后退按钮行为的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！