Android TabHost - 返回按钮

Question

我有一个使用 TabHost 的 Android 应用程序，根据所选选项卡调用其他应用程序的 Activity 简称为 Main.java。我试图覆盖 Main.java 类中的后退按钮事件，但它似乎没有看到它。我正在尝试显示一个对话框窗口并向用户确认他们要注销，如果他们单击“确定”，则完全关闭应用程序(不仅仅是发送到后台)，如果他们单击“取消”，显然让它保持打开状态。关于为什么这似乎不起作用的任何建议？

@Override
public void onBackPressed() 
{               
     AlertDialog.Builder alert = new AlertDialog.Builder(getApplicationContext());
     alert.setMessage("Test dialog");
     alert.show();
}

Answer 1

It turns out to be pretty easy. Add the following code to your child tab activity :

@Override
public void onBackPressed() {
this.getParent().onBackPressed();   
}

Then in the TabActivity do the real logic:

 @Override
public void onBackPressed() {
// Called by children
 AlertDialog.Builder alert = new AlertDialog.Builder(getApplicationContext());
 alert.setMessage("Test dialog");
 alert.show();
}

Otherwise, the children will intercept and consume the event without notifying the tab host.