Android DroidGap禁用后退按钮

Question

Please, anyone suggest, how can I disable back button press event while working with PhoneGap ?

I need to do something in my Activity , ( DroidGap code) for controlling the back button event.

Even, the following code works well in my Activity , but not working when being used with DroidGap .

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
     if (keyCode == KeyEvent.KEYCODE_BACK) {
         //preventing default implementation previous to android.os.Build.VERSION_CODES.ECLAIR
         return true;
     }
     return super.onKeyDown(keyCode, event);    
}

Answer 1

Calling setOnKeyListener on appView helped me out.

I just had to make a minor change in my above code snippet, which is as follows:

appView.setOnKeyListener(new OnKeyListener() { 
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            return true;
        }
        return onKeyDown(keyCode, event); 
    } 
});

EDITED

There actually occurs two actions while key-pressing event - Action Up & Action Down

So, the following should be used in order to get the key event.

appView.setOnKeyListener(new OnKeyListener() { 
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_UP) {
            // Do Here whatever you want 
            return true;
        }
        return onKeyDown(keyCode, event); 
    } 
});

Answer 2

Slightly better than Narendra's version. It can handle key up calls for key presses other than back button properly. Put the code below inside onCreate override for example.

appView.setOnKeyListener(new View.OnKeyListener() { 

        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (event.getAction() == KeyEvent.ACTION_UP) {
                if(keyCode == KeyEvent.KEYCODE_BACK) {
                    // Do Stuff Here
                    return true;
                }
                return onKeyUp(keyCode, event);
            }
            return onKeyDown(keyCode, event); 
        } 
   });

Answer 3

In my case, I use Javascript + jquery like so:

$(document).on('backbutton',
     function(e){

         e.preventDefault();

         // do whatever you like here.

});

Answer 4

// ************ stop the back button  *****************

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {

        return true;
    }
    return super.onKeyDown(keyCode, event);
}

Answer 5

if (keyCode == KeyEvent.KEYCODE_BACK) {

    return true;
}