Android Volume Key Event Capture

问题

I am currently developing an app for android..

how i can capture the volume key event when user press in android phone

i am using phone gap...

回答1:

Use the below code to get the key event

Use this code in your existing java class

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

    //If volume down key
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
        this.loadUrl("javascript:cordova.fireDocumentEvent('volumedownbutton');");
        return true;
    } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
        this.loadUrl("javascript:cordova.fireDocumentEvent('volumeupbutton');");
        return true;
    } else {
        //return super.onKeyDown(keyCode, event); 
    }
    //return super.onKeyDown(keyCode, event);

    return true;
}

and using this below in your html page

document.addEventListener("volumeupbutton", onVolumeUpKeyDown, false);  

document.addEventListener("volumedownbutton", volumedownbutton, false);

function    onVolumeUpKeyDown()
{
    alert("Working Up")     
}

function    volumedownbutton()
{
    alert("Working Down")       
}

I Got This Answer From Here https://stackoverflow.com/questions/9770901/phonegap-event-volumeupbutton-and-volumedownbutton-is-not-working

回答2:

As mentioned in Phonegap API Docs, This following code works only in Blackberry:

document.addEventListener("volumeupbutton", yourCallbackFunction, false);
document.addEventListener("volumedownbutton", yourCallbackFunction, false);

But there's nothing harm in checking it out. It might work with the latest Phonegap SDK

hope this helps!

回答3:

You can add events listener in the PhoneGap for volume key buttons as described in the PhoneGap Documentation like this

Thanks

来源：https://stackoverflow.com/questions/12890170/android-volume-key-event-capture