在我的应用程序中,我使用带有五个选项卡的TabActivity,每个选项卡包含一个ActvityGroup,每个ActivityGroup管理多个Activity.one的ActivtyGroups有两个Activies:A和B,当单击A中的一个按钮时,它跳转到B.当返回A时,我想在B.中显示一些已更改的数据。我遇到的是:
首先,如果我启动B并且B中的某个小部件获得焦点,当单击后退按钮时,app直接退出。我调试它并在完成B时找到它同时完成应用程序。第二,如果我开始B和没有任何小部件获得焦点,当单击后退按钮时,B中的onKeyDown()不起作用。
这是我的活动组,我将viewanimator视为容器:
public class Group extends ActivityGroup
{
private Stack<String>aString;
private LocalActivityManager manager;
private ViewAnimator animator;
private int ID;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.group_products);
aString = new Stack<String>();
animator = (ViewAnimator) findViewById(R.id.pro_va_animator);
manager = getLocalActivityManager();
Intent intent = new Intent(this,Products_Category.class);
startActivity(intent);
}
@Override
public void startActivity(Intent intent)
{
String id = "id" + ID++;
aString.push(id);
View view = manager.startActivity(id, intent).getDecorView();
animator.addView(view);
animator.setDisplayedChild(aString.size() - 1);
}
@Override
public void startActivityForResult(Intent intent,int requestCode)
{
String id = "id" + ID++;
aString.push(id);
View view = manager.startActivity(id, intent).getDecorView();
animator.addView(view);
animator.setDisplayedChild(aString.size() - 1);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_BACK)
{
int size = aString.size();
if (size > 0)
{
String topId = aString.pop();
View view = manager.destroyActivity(topId, true).getDecorView();
animator.removeView(view);
if (size > 1)
{
return true;
}
}
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onActivityResult(int requestCode,int resultCode,Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
A subActivity=(A)(manager.getCurrentActivity());
A.handleActivityResult(requestCode, resultCode, data);
break;
}
}
在B类中,我重写onKeyDown()以在bundle中添加一些已更改的数据:
@Override
public boolean onKeyDown(int keyCode,KeyEvent event)
{
if(keyCode==KeyEvent.KEYCODE_BACK)
{
Log.e("prodcuts_3","inner");
Bundle bundle=new Bundle();
bundle.putString("name",name);
bundle.putString("price",price);
bundle.putString("quantity",quantity);
this.setResult(RESULT_CANCELED,this.getIntent().putExtras(bundle));
this.finish();
return this.getParent().onKeyDown(keyCode, event);
}
return super.onKeyDown(keyCode, event);
}
在A班:
public void handleActivityResult(int requestCode,int resultCode,Intent data)
{
if(resultCode==RESULT_CANCELED)
{
String price=data.getExtras().getString("price");
......
}
}
谢谢你们的进步!!
答案 0 :(得分:1)
将以下内容添加到您的类中,该类从扩展TabGroupActivity
的类调用@Override
public void onBackPressed() {
return;
}