I cant seem to find an event that listens for playback state. I am mostly interested in the play/pause state. I am using MediaController which has a Play/Pause button, but I have a secondary button that also controls Play/Pause. Using my custom button, I can play/pause, but if I play/pause using the MediaController play/pause button, I currently have no way to change the image on my custom play/pause button to either play or pause.
Is there an event that I do not know about so I can do some work during play/pause?
This is a very similar question: How to catch event when click pause/play button on MediaController
If you're using the MediaController in combination with a VideoView, it should be relatively easy to extend the latter and add your own listener to it.
The custom VideoView would then look something like this in its most basic form:
public class CustomVideoView extends VideoView {
private PlayPauseListener mListener;
public CustomVideoView(Context context) {
super(context);
}
public CustomVideoView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomVideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void setPlayPauseListener(PlayPauseListener listener) {
mListener = listener;
}
#Override
public void pause() {
super.pause();
if (mListener != null) {
mListener.onPause();
}
}
#Override
public void start() {
super.start();
if (mListener != null) {
mListener.onPlay();
}
}
public static interface PlayPauseListener {
void onPlay();
void onPause();
}
}
Using it is identical to using a regular VideoView, with the only difference being that we can now hook up our own listener to it.
// Some other code above...
CustomVideoView cVideoView = (CustomVideoView) findViewById(R.id.custom_videoview);
cVideoView.setPlayPauseListener(new CustomVideoView.PlayPauseListener() {
#Override
public void onPlay() {
System.out.println("Play!");
}
#Override
public void onPause() {
System.out.println("Pause!");
}
});
cVideoView.setMediaController(new MediaController(this));
cVideoView.setVideoURI(...);
// or
cVideoView.setVideoPath(...);
// Some other code below...
Finally, you may also declare it in your xml layout and inflate it (as shown above) - just make sure your use <package_name>.CustomVideoView. Example:
<mh.so.CustomVideoView android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="#+id/custom_videoview" />
You should be able to set your own MediaController.MediaPlayerControl and override pause and start
Related
I need to detect when a VideoView is paused, so I can hide some UI elements on my screen. VideoView does not have a mechanism to inform you of a pause event. How do I do this?
I haven't seen a good answer to this (so many people using threads). Here's mine:
import android.content.Context;
import android.util.AttributeSet;
import android.widget.VideoView;
public class PlayStateBroadcastingVideoView extends VideoView{
public interface PlayPauseListener {
void onPlay();
void onPause();
}
private PlayPauseListener mListener;
public PlayStateBroadcastingVideoView(Context context) {
super(context);
}
public PlayStateBroadcastingVideoView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PlayStateBroadcastingVideoView(Context context, AttributeSet attrs, int theme) {
super(context, attrs, theme);
}
#Override
public void pause() {
super.pause();
if(mListener != null) {
mListener.onPause();
}
}
#Override
public void start() {
super.start();
if(mListener != null) {
mListener.onPlay();
}
}
public void setPlayPauseListener(PlayPauseListener listener) {
mListener = listener;
}
}
It works because upon diving into the code (at least as of 5.0), the only function that puts it into the pause state is pause, and the only one that puts it into the playing state is start. So we simply hook these to notify us via a listener. Then use this class in your layout in place of VideoView.
I'm making a custom button which is designed to handle onClick events internally. Here's a simplified version of my implementation:
public class CustomButton extends Button implements View.OnClickListener {
public CustomButton(Context context) {
super(context);
setOnClickListener(this);
}
#Override
public void onClick(View v) {
setText("Clicked!");
}
}
No surprises in the above code! The problem is that the activity/fragment/whatever containing the button could call setOnClickListener(View) which would prevent the onClick(View) method inside the button from receiving the onClick event, thus changing the function of my button in an undesirable way. I though about overriding setOnClickListener(View) to throw an exception if the argument is not this, but I don't want to prevent the button from having external listeners, I just want to add an internal feature.
Which method of Button if any can I override to do extra stuff when the button is clicked without taking away the ability of other classes to listen to onClick events? Basically, which method in Button dispatches OnClick events?
I thought of a solution. I made CustomButton as follows:
public class CustomButton extends Button implements View.OnClickListener {
private OnClickListener externalOnClickListener;
public CustomButton(Context context) {
super(context);
super.setOnClickListener(this);
}
public CustomButton(Context context, AttributeSet attrs) {
super(context, attrs);
super.setOnClickListener(this);
}
public CustomButton(Context context, AttributeSet attrs, int defStyleAttrs) {
super(context, attrs, defStyleAttrs);
super.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// Do all of my stuff
setText("Clicked!");
setBackground(Color.GREEN);
// Pass onClick event to external listener
if (externalOnClickListener != null) {
externalOnClickListener.onClick(v);
}
}
#Override
public void setOnClickListener(OnClickListener l) {
externalOnClickListener = l;
}
}
Basically setOnClickListener() is overriden so that it just stores the passed listener as an instance variable. At construction, the button sets itself as its own on click listener, so that it can receive the on click events, do something, then pass the event on to the stored listener.
i would like to create a class, which extends Button and implement a method, which is alwasy called, when the Button is clicked. But i still want it's OnClickListener to be called.
My Idea is to save the OnClickListener into a private member when the constructor or setOnClickListener is called and then set the OnClickListener to my own OnClickListener. This one would then call my method and the saved OnClickListener.
But i don't see how i can get the OnClickListenr, i only see, how to set it.
Is there a way to acces it?
Or do you have a better idea? (it doesn't matter wheter my method is called before or after the OnClickListener)
I guess you could do this:
public class OnceClickedTwiceRunButton extends Button{
public OnceClickedTwiceRunButton(Context context) {
super(context);
}
public OnceClickedTwiceRunButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
public OnceClickedTwiceRunButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
private OnClickListener extraClickMethod;
#Override
public void setOnClickListener(OnClickListener newListener)
{
super.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
DefaultClickMethod(v);
if(extraClickMethod != null)
{
extraClickMethod.onClick(v);
}
}
});
extraClickMethod = newListener;
}
private void DefaultClickMethod(View v)
{
//TODO
}
}
I am working on an android app and I have a custom GUI component which extends a TextView.
I want to have my custom control do a task when clicked from my custom control class and my overridden onclick method.
For example my class that extends the TextView implements the OnClick listener and writes a log to the log cat.
Then in my activity, I set an onclick listener to my custom control, and this shows a toast notification.
What I want to happen, is when my custom control is clicked, my activities overridden onclick shows the toast and the custom control class on click method also is run to show the log. But I can only seem to get one working or the other, for example, if I don't run myCustom.setOnClickListener(myListener) then the classes onclick is used and does the log, if I set the onClick listener then I only get the toast not the log.
Below is my custom control class
public class NavTextView extends TextView implements View.OnClickListener
{
public NavTextView(Context context) {
super(context);
setOnClickListener(this);
}
public NavTextView(Context context, AttributeSet attrs) {
super(context, attrs);
setOnClickListener(this);
}
public NavTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setOnClickListener(this);
}
public NavTextView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
setOnClickListener(this);
}
#Override
public void onClick(View v) {
Log.d("NavTextView", "This has been clicked");
}
}
Below is my activities onCreate method
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
navTextView = (NavTextView)findViewById(R.id.navTextView);
navTextView.setOnClickListener(mClickListener);
}
Hope this makes sense
A View can only have one OnClickListener. In your NavTextView you are setting it there. If you later call setOnClickListener again, you are replacing the previous listener.
What you can do is override setOnClickListener in your custom View, then wrap the OnClickListener and call both.
public class MyTextView extends TextView implements View.OnClickListener
{
OnClickListener _wrappedOnClickListener;
public MyTextView(Context context) {
super(context);
super.setOnClickListener(this);
}
#Override
public void onClick(View view) {
Log.d("NavTextView", "This has been clicked");
if (_wrappedOnClickListener != null)
_wrappedOnClickListener.onClick(view);
}
#Override
public void setOnClickListener(OnClickListener l) {
_wrappedOnClickListener = l;
}
}
Is there an onImageChangedListener() on a ImageView?
I need the event when the image is changed from the ImageView.
There is no default listener in Android .. but we can create the imagechange listiner .. copy the class and instead of using ImageView use MyImageView..
public class MyImageView extends ImageView {
private OnImageChangeListiner onImageChangeListiner;
public MyImageView(Context context) {
super(context);
}
public MyImageView(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
}
public void setImageChangeListiner(
OnImageChangeListiner onImageChangeListiner) {
this.onImageChangeListiner = onImageChangeListiner;
}
#Override
public void setBackgroundResource(int resid) {
super.setBackgroundResource(resid);
if (onImageChangeListiner != null)
onImageChangeListiner.imageChangedinView(this);
}
#Override
public void setBackgroundDrawable(Drawable background) {
super.setBackgroundDrawable(background);
if (onImageChangeListiner != null)
onImageChangeListiner.imageChangedinView(this);
}
public static interface OnImageChangeListiner {
public void imageChangedinView(ImageView mImageView);
}
}
Check the imageview code in grepcode. You don't know when it is changed or redrawn. It is because after you setImageDrawable(), imageview will invalidate. At this time, the image IS NOT CHANGED correctly until ondraw is called.
Anyway, why do you want to know the onimagechangedlistener?
If you want to load the image from network and check change in imageview you can use imageView.isAttachedToWindow(). I have tried downloading the image from network and disabled the progressbar after image downloaded and attached to window.
Use,
if(imageView.isAttachedToWindow()){
//your code here
}