Improve closing an HTML page and returning to previous page.

framework/src/com/phonegap/App.java

@@ -44,6 +44,9 @@ public class App extends Plugin {
             }
         	else if (action.equals("clearHistory")) {
             	this.clearHistory();
+            }
+            else if (action.equals("backHistory")) {
+                this.backHistory();
             }
         	else if (action.equals("overrideBackbutton")) {
             	this.overrideBackbutton(args.getBoolean(0));
@@ -144,9 +147,19 @@ public class App extends Plugin {
 	
     /**
      * Clear web history in this web view.
+     * This does not have any effect since each page has its own activity.
      */
     public void clearHistory() {
     	((DroidGap)this.ctx).clearHistory();
+    	// TODO: Kill previous activities?
+    }
+    
+    /**
+     * Go to previous page displayed.
+     * This is the same as pressing the backbutton on Android device.
+     */
+    public void backHistory() {
+        ((DroidGap)this.ctx).endActivity();
     }
 
     /**
@@ -174,7 +187,7 @@ public class App extends Plugin {
      */
     public void exitApp() {
         ((DroidGap)this.ctx).setResult(Activity.RESULT_OK);
-    	((DroidGap)this.ctx).onDestroy();
+    	((DroidGap)this.ctx).endActivity();
     }
 
     /**

framework/src/com/phonegap/DroidGap.java

@@ -716,13 +716,6 @@ public class DroidGap extends PhonegapActivity {
         
         if (this.appView != null) {
 
-            // Make invisible
-            DroidGap.this.runOnUiThread(new Runnable() {
-                public void run() {
-                    DroidGap.this.setVisible(false);
-                }
-            });
-
             // Make sure pause event is sent if onPause hasn't been called before onDestroy
             this.appView.loadUrl("javascript:try{PhoneGap.onPause.fire();}catch(e){};");
 
@@ -816,7 +809,7 @@ public class DroidGap extends PhonegapActivity {
         
         // Finish current activity
         if (clearPrev) {
-            this.finish();
+            this.endActivity();
         }
     }
     
@@ -1300,6 +1293,13 @@ public class DroidGap extends PhonegapActivity {
         }
     }
     
+    /**
+     * End this activity by simulating backbutton keypress
+     */
+    public void endActivity() {
+        super.onKeyDown(KeyEvent.KEYCODE_BACK, new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK));
+    }
+    
     /**
      * Called when a key is pressed.
      * 
@@ -1408,7 +1408,7 @@ public class DroidGap extends PhonegapActivity {
              // If terminating app, then shut down this activity too
              if (resultCode == Activity.RESULT_OK) {
                  this.setResult(Activity.RESULT_OK);
-                 this.onDestroy();
+                 this.endActivity();
              }
              return;
          }