问题
Basically I'm using ActivityGroup in my application. I have this situation:
I have Tabhost with activity A.
Activity A creates childActivity B.
A ---> B
startChildActivity("CollectionList", new Intent(this,MyCollectionList.class));
Activity B creates 3 childactivities C, D.
B ---> C (childActivity of B)
startChildActivity("Recommended", new Intent(MyCollectionList.this,Recommended.class));
B ---> D (childActivity of B)
startChildActivity("ExpectSoon", new Intent(MyCollectionList.this,ExpectSoon.class));
B creates another childActivity too, name it E.
B ---> E
Intent previewMessage = new Intent(getParent(), MyCollectionId.class);
TabGroupActivity parentActivity = (TabGroupActivity)getParent();
parentActivity.startChildActivity("MyCollectionId", previewMessage);
So basically Activity C and D can start activity E too, with :
Intent previewMessage = new Intent(getParent(), MyCollectionId.class);
TabGroupActivity parentActivity = (TabGroupActivity)getParent();
parentActivity.startChildActivity("MyCollectionId", previewMessage);
I had Override the onBackPressed method so I can control the back button.It looks like this :
private ArrayList<String> mIdList;
@Override
public void onBackPressed () {
int length = mIdList.size();
if ( length >=1) {
Activity current = getLocalActivityManager().getActivity(mIdList.get(length-1));
current.finish();
}
}
So my problem is that when I'm in activity E and press the back button my application close.And the other problem that I have is with the alert dialog in activity E.
Button deactivate = (Button) findViewById(R.id.deactivate);
deactivate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
new AlertDialog.Builder( getParent() )
.setTitle( "Warning" )
.setMessage( "The collection will be removed completely from the device.You can reactivate it later again.This operation requires internet connection." )
.setPositiveButton( "Go ahead", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.d("AlertDialog", "Positive");
}
})
.setNegativeButton( "Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.d("AlertDialog","Negative");
}
})
.show();
}
});
When I start Activity E from A, when I click the button,which will show the alert dialog,everything is ok.But when I start activity E from C or D it throws me that exception :
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): FATAL EXCEPTION: main
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@4630ea20 is not valid; is your activity running?
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.ViewRoot.setView(ViewRoot.java:509)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.Window$LocalWindowManager.addView(Window.java:424)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.app.Dialog.show(Dialog.java:241)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at com.stampii.stampii.mystampii.MyCollectionId$4.onClick(MyCollectionId.java:75)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.View.performClick(View.java:2408)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.view.View$PerformClick.run(View.java:8817)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.os.Handler.handleCallback(Handler.java:587)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.os.Handler.dispatchMessage(Handler.java:92)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.os.Looper.loop(Looper.java:144)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at android.app.ActivityThread.main(ActivityThread.java:4937)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at java.lang.reflect.Method.invokeNative(Native Method)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at java.lang.reflect.Method.invoke(Method.java:521)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-15 15:48:22.819: ERROR/AndroidRuntime(32440): at dalvik.system.NativeStart.main(Native Method)
EDIT:
My startChildActivity looks like this :
public void startChildActivity(String Id, Intent intent) {
Window window = getLocalActivityManager().startActivity(Id,intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
if (window != null) {
mIdList.add(Id);
setContentView(window.getDecorView());
}
}
latest LogCat,while using Recommended.parentActivity in ActivityE :
new AlertDialog.Builder( Recommended.parentActivity )
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): FATAL EXCEPTION: main
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): java.lang.NullPointerException
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.android.internal.app.AlertController$AlertParams.<init>(AlertController.java:743)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:273)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.stampii.stampii.mystampii.MyCollectionId$4.onClick(MyCollectionId.java:62)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.view.View.performClick(View.java:2408)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.view.View$PerformClick.run(View.java:8817)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.os.Handler.handleCallback(Handler.java:587)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.os.Handler.dispatchMessage(Handler.java:92)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.os.Looper.loop(Looper.java:144)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at android.app.ActivityThread.main(ActivityThread.java:4937)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at java.lang.reflect.Method.invokeNative(Native Method)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at java.lang.reflect.Method.invoke(Method.java:521)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-15 16:33:53.509: ERROR/AndroidRuntime(1967): at dalvik.system.NativeStart.main(Native Method)
回答1:
you can do onething in ActivityA.java
public static Activity parentActivity;
onCreate()
{
parentActivity=this;
}
// start your child activity ie(E)
ActivityE.java
Button deactivate = (Button) findViewById(R.id.deactivate);
deactivate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
new AlertDialog.Builder( ActivityA.parentActivity.this )
.setTitle( "Warning" )
.setMessage( "The collection will be removed completely from the device.You can reactivate it later again.This operation requires internet connection." )
.setPositiveButton( "Go ahead", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.d("AlertDialog", "Positive");
}
})
.setNegativeButton( "Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.d("AlertDialog","Negative");
}
})
.show();
}
});
来源：https://stackoverflow.com/questions/7065108/android-childactivity-getparent-question