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Why when I use setClickable(true) it's not show the action of click

Actually, I use a ListView and when I use setClickable(false) I have the animation as if I clicked on a button you see? The animation that shows you click. Which is not normal, I think, basic.
And when I use setClickable(true) I no longer have the animation, as well as if I use
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
And i would like to use the OnClickListener but I think it would be better for the user to see that he can click, so to have the animation when you click.
So, I'd like to see when the user clicks on an item in the list, it does the action I want (I'll add that later) but let's imagine a Toast but it displays the effect as if you click on a button. The effect i got if i use setClickable(false) (the default setting).
That's the ripple effect !

In the row's layout of the ListView just add:
android:background="?android:attr/selectableItemBackground"
android:clickable="true"
android:focusable="true"
This will add the Ripple effect. If you want to show it on top of the other views, use the forground attribute:
android:foreground="?android:attr/selectableItemBackground"
android:clickable="true"
android:focusable="true"

add this foreground:?attr/selectableItemBackground to your view attribute, it should work

how to use Imageview as Clickable?

How can I use imageview as a button(clickable) in my project? As of now i am using button object but i want to display an image and not a button.
Thanks in advance
android

ImageView do listen to click events i.e. OnClickListener. So if you plan to use them as clickable you do not need any additional set up for it.
Simply create an ImageView,
<ImageView
android:id="#+id/imgClickable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="your image"
/>
Then get its reference in your Java code,
ImageView clikableImage = (ImageView) findViewById(R.id.imgClickable);
clikableImage .setOnClickListener(this); //This make it clickable
And finally handle its onClick event by overriding
#override
public void onClick(View v){
//Your action
}

You can use android:clickable="true" attribute. And then you can use onClickListener to implement a listener.
But if you want to use an image instead of button you should consider ImageButton.
http://developer.android.com/reference/android/widget/ImageButton.html

It's pretty simple. Either in your layout when you define the ImageView you can add android:onClick="someFunction" and which calls someFunction whenever you click the image (make sure you define it in your code) or you can programmatically just add an onClickListener to the ImageView.

You can include the ImageView wherever you want on your layout and implement the OnClickListener interface to listen for click events. It would be something like:
ImageView image = (ImageView) findViewById(R.id.your_id);
imager.setOnClickListener(new View.OnClickListener() {
// Do something
});

Wll how about using ImageButton.
Uoc can find it when you open a layout xml file, and at the Grapichal layout - You would see ImageButton unter the Images&Media options menu.

how to zoom-in interface? Android development

In my Android application, I have an activity with three layouts: A left layout, a middle layout, and a right layout.
The right layout is the main one. I want the right layout to zoom into fullscreen when I click a button. If you have the specific code,it's better.
Thanks very much!

If I got your question right:
Your button's OnClickListener should look like something like this:
OnClickListener listener = OnClickListener() {
public void onClick(View v){
findViewById(R.id.left_layout).setVisibility(View.INVISIBLE);
findViewById(R.id.center_layout).setVisibility(View.INVISIBLE);
};
This by itself will not get your right layout to fullscreen. You'll need to add something the below to your right layout for it to "auto fullscreen":
android:layout_width = "0dp";
android:layout_weight = "1";
if you don't do that, you'll have to resize the right layout from the "listener" above.

Hmm, the question is vague, but if I understand correctly, what you want to do is hide the left and center layouts when a button is clicked, so that the right layout becomes full-screen?
Without more details, it's not easy to give you a more precise answer (please post your current layout), but I would do something like:
// this code in your Activity:
// this method is bound to button onCLick (android:onClick="clickButton")
public void clickButton(View view) {
findViewById(R.id.left_layout).setVisibility(View.INVISIBLE);
findViewById(R.id.center_layout).setVisibility(View.INVISIBLE);
}
And to revert back to a 3-layout display, you do the opposite (View.VISIBLE)

How to create an ImageButton with an overlayed image?

I have a button that starts out as a placeholder, but once the user authenticates, it changes to a custom image for that user.
<ImageButton android:id="#+id/button"
android:background="#null"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="#drawable/button_default"/>
And then later:
ImageButton ib = (ImageButton)findViewById(R.id.button);
ib.setImageBitmap(previouslyDecodedBitmap);
But this looks terrible. I can't figure out how to style it properly so that the newly decoded bitmap is the right size and behaves like an ImageButton. I suspect there is some combination of widgets I can use other than ImageButton to achieve this? I was hoping I could just nest an ImageView on top of the ImageButton by adding it as a child to ImageButton, but that doesn't seem to be allowed (it is in Silverlight...).
Anyway, any suggestions on how to properly do this are welcome. Thanks.

One way would be to use frame layout and place buttons and image one over the other , top being imageview , keep it invisible (android:visibility = "invisible")
On clicking the button and authenticating , make it visible over the button or else even you can hide the button below and show only image on top.

Android button dynamically placed on button

I wanted to know if there is a way to place a button on the bottom of the screen, no matter what size screen the device has. I basically want the button to have a gravity="bottom", not just its text. I have been trying to do this, and I cannot find a way to do it. any suggestions?

What layout is the button in? Using a relative layout, you can set the button to align_parent_bottom.

use a RelativeLayout with layout_height="fill_parent" then set the button's layout_alignParentBottom value to true in the XML file

Never mind, I created a child LinearLayout only for and I put
android:gravity="bottom"
in the child and it worked :-)

Try using android:layout_gravity="bottom" on the Button :)