Rather than manually managing the back button, try to give android better back button hinting

fix our notification -> intent behavior

AndroidManifest.xml

@@ -31,14 +31,18 @@
                  android:label="@string/remote_control_label"
                  android:description="@string/remote_control_desc"/>
     <uses-permission android:name="com.fsck.k9.permission.REMOTE_CONTROL"/>
-    <application android:icon="@drawable/icon" android:label="@string/app_name" android:name="K9"
+    <application 
+        android:icon="@drawable/icon" 
+        android:label="@string/app_name" 
+        android:name="K9"
+        android:allowTaskReparenting="false"
         >
         <meta-data android:name="android.app.default_searchable"
                    android:value=".activity.Search" />
 
         <activity
             android:name="com.fsck.k9.activity.Accounts"
-            android:launchMode="singleTop"
+            android:launchMode="singleInstance"
             android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -135,7 +139,9 @@
             android:label="@string/debug_title">
         </activity>
         <activity
-            android:name="com.fsck.k9.activity.FolderList">
+            android:name="com.fsck.k9.activity.FolderList"
+            android:launchMode="singleTask"
+            >
             <!--
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />
@@ -148,7 +154,10 @@
             -->
         </activity>
         <activity
-            android:name="com.fsck.k9.activity.MessageList">
+            android:name="com.fsck.k9.activity.MessageList"
+            android:launchMode="singleTask"
+
+            >
             <!--
             <intent-filter>
                 <action android:name="android.intent.action.VIEW" />

src/com/fsck/k9/MessagingController.java

@@ -37,6 +37,7 @@ import android.os.PowerManager.WakeLock;
 import android.text.TextUtils;
 import android.util.Log;
 
+import com.fsck.k9.activity.FolderList;
 import com.fsck.k9.activity.MessageList;
 import com.fsck.k9.mail.Address;
 import com.fsck.k9.mail.FetchProfile;
@@ -4198,7 +4199,7 @@ public class MessagingController implements Runnable
         Notification notif = new Notification(R.drawable.stat_notify_email_generic, messageNotice, System.currentTimeMillis());
         notif.number = unreadMessageCount;
 
-        Intent i =             MessageList.actionHandleFolderIntent(context, account, account.getAutoExpandFolderName());
+        Intent i = FolderList.actionHandleAccountIntent(context, account, account.getAutoExpandFolderName());
         PendingIntent pi = PendingIntent.getActivity(context, 0, i, 0);
 
         // 279 Unread (someone@gmail.com)

src/com/fsck/k9/activity/Accounts.java

@@ -41,32 +41,6 @@ public class Accounts extends K9ListActivity implements OnItemClickListener, OnC
     private AccountsAdapter mAdapter;
 
 
-    @Override
-    public boolean onKeyDown(int keyCode, KeyEvent event)
-    {
-        if (
-            // TODO - once we upgrade to 2.0, uncomment this
-            // android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.ECLAIR &&
-            keyCode == KeyEvent.KEYCODE_BACK
-            && event.getRepeatCount() == 0)
-        {
-            // Take care of calling this method on earlier versions of
-            // the platform where it doesn't exist.
-            onBackPressed();
-            return true;
-        }
-
-        return super.onKeyDown(keyCode, event);
-    }
-
-    public void onBackPressed()
-    {
-        // This will be called either automatically for you on 2.0
-        // or later, or by the code above on earlier versions of the
-        // platform.
-        finish();
-    }
-
     class AccountsHandler extends Handler
     {
         private void setViewTitle()
@@ -439,7 +413,6 @@ public class Accounts extends K9ListActivity implements OnItemClickListener, OnC
         {
             MessageList.actionHandleFolder(this, account, account.getAutoExpandFolderName());
         }
-        finish();
     }
 
     public void onClick(View view)

src/com/fsck/k9/activity/FolderList.java

@@ -245,27 +245,17 @@ public class FolderList extends K9ListActivity
     public void onCreate(Bundle savedInstanceState)
     {
 
-        String initialFolder;
 
         super.onCreate(savedInstanceState);
+        onNewIntent(getIntent());
+    }
+
+    public void onNewIntent (Intent intent) {
         String savedFolderName = null;
-        Intent intent = getIntent();
+        String initialFolder;
         mAccount = (Account)intent.getSerializableExtra(EXTRA_ACCOUNT);
 
-        if (savedInstanceState == null)
-        {
             initialFolder = intent.getStringExtra(EXTRA_INITIAL_FOLDER);
-        }
-        else
-        {
-            initialFolder = null;
-            savedFolderName = savedInstanceState.getString(STATE_CURRENT_FOLDER);
-            if (savedFolderName != null)
-            {
-                mSelectedContextFolder = mAdapter.getFolder(savedFolderName);
-            }
-        }
-
         if (
             initialFolder != null
             && !K9.FOLDER_NONE.equals(initialFolder))
@@ -374,32 +364,9 @@ public class FolderList extends K9ListActivity
     }
 
 
-    public void onBackPressed()
-    {
-        // This will be called either automatically for you on 2.0
-        // or later, or by the code above on earlier versions of the
-        // platform.
-        onAccounts();
-    }
-
     @Override public boolean onKeyDown(int keyCode, KeyEvent event)
     {
         //Shortcuts that work no matter what is selected
-
-        if (
-            // TODO - when we move to android 2.0, uncomment this.
-            // android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.ECLAIR &&
-
-            keyCode == KeyEvent.KEYCODE_BACK
-            && event.getRepeatCount() == 0)
-        {
-            // Take care of calling this method on earlier versions of
-            // the platform where it doesn't exist.
-            onBackPressed();
-            return true;
-        }
-
-
         switch (keyCode)
         {
             case KeyEvent.KEYCODE_Q:
@@ -527,7 +494,6 @@ public class FolderList extends K9ListActivity
     private void onOpenFolder(String folder)
     {
         MessageList.actionHandleFolder(this, mAccount, folder);
-        finish();
     }
 
     private void onCompact(Account account)

src/com/fsck/k9/activity/MessageList.java

@@ -363,14 +363,38 @@ public class MessageList
 
         mBatchDoneButton.setOnClickListener(this);
 
-        Intent intent = getIntent();
+        // Gesture detection
+        gestureDetector = new GestureDetector(new MyGestureDetector());
+        gestureListener = new View.OnTouchListener()
+        {
+            public boolean onTouch(View v, MotionEvent event)
+            {
+                if (gestureDetector.onTouchEvent(event))
+                {
+                    return true;
+                }
+                return false;
+            }
+        };
+
+        mListView.setOnTouchListener(gestureListener);
+        
+        if (savedInstanceState != null)
+        {
+            mFolderName = savedInstanceState.getString(STATE_CURRENT_FOLDER);
+            mQueryString = savedInstanceState.getString(STATE_QUERY);
+            mSelectedCount  = savedInstanceState.getInt(STATE_KEY_SELECTED_COUNT);
+            onRestoreListState(savedInstanceState);
+        }
+        onNewIntent(getIntent());
+    }
+
+    public void onNewIntent(Intent intent) {
         mAccount = (Account)intent.getSerializableExtra(EXTRA_ACCOUNT);
 
         // Take the initial folder into account only if we are *not* restoring the
         // activity already
 
-        if (savedInstanceState == null)
-        {
             mFolderName = intent.getStringExtra(EXTRA_FOLDER);
             mQueryString = intent.getStringExtra(EXTRA_QUERY);
 
@@ -380,13 +404,6 @@ public class MessageList
             {
                 mFolderName = mAccount.getAutoExpandFolderName();
             }
-        }
-        else
-        {
-            mFolderName = savedInstanceState.getString(STATE_CURRENT_FOLDER);
-            mQueryString = savedInstanceState.getString(STATE_QUERY);
-            mSelectedCount  = savedInstanceState.getInt(STATE_KEY_SELECTED_COUNT);
-        }
 
         mAdapter = new MessageListAdapter();
 
@@ -407,26 +424,6 @@ public class MessageList
 
         mListView.setAdapter(mAdapter);
 
-        if (savedInstanceState != null)
-        {
-            onRestoreListState(savedInstanceState);
-        }
-        // Gesture detection
-        gestureDetector = new GestureDetector(new MyGestureDetector());
-        gestureListener = new View.OnTouchListener()
-        {
-            public boolean onTouch(View v, MotionEvent event)
-            {
-                if (gestureDetector.onTouchEvent(event))
-                {
-                    return true;
-                }
-                return false;
-            }
-        };
-
-        mListView.setOnTouchListener(gestureListener);
-
 
     }
 
@@ -518,29 +515,9 @@ public class MessageList
     }
 
 
-    public void onBackPressed()
-    {
-        // This will be called either automatically for you on 2.0
-        // or later, or by the code above on earlier versions of the
-        // platform.
-        onShowFolderList();
-    }
-
-
     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event)
     {
-        if (
-            // XXX TODO - when we go to android 2.0, uncomment this
-            // android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.ECLAIR &&
-            keyCode == KeyEvent.KEYCODE_BACK
-            && event.getRepeatCount() == 0)
-        {
-            // Take care of calling this method on earlier versions of
-            // the platform where it doesn't exist.
-            onBackPressed();
-            return true;
-        }
         //Shortcuts that work no matter what is selected
 
         switch (keyCode)

src/com/fsck/k9/activity/MessageView.java

@@ -103,14 +103,6 @@ public class MessageView extends K9Activity
     private Listener mListener = new Listener();
     private MessageViewHandler mHandler = new MessageViewHandler();
 
-    public void onBackPressed()
-    {
-        // This will be called either automatically for you on 2.0
-        // or later, or by the code above on earlier versions of the
-        // platform.
-        finish();
-    }
-
 
     @Override
     public boolean dispatchKeyEvent(KeyEvent event)
@@ -130,16 +122,6 @@ public class MessageView extends K9Activity
 
     public boolean onKeyDown(int keyCode, KeyEvent event)
     {
-        if (
-            // TODO: when we get to 2.0, uncomment this
-            // android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.ECLAIR &&
-            keyCode == KeyEvent.KEYCODE_BACK
-            && event.getRepeatCount() == 0)
-        {
-            // Take care of calling this method on earlier versions of
-            // the platform where it doesn't exist.
-            onBackPressed();
-        }
         switch (keyCode)
         {
             case KeyEvent.KEYCODE_DEL: