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how do I drawline on canvas with a button press

The Title says it all. drawline works outside the setOnClick Listener, but not inside, so I can set it to run with a button press.
//Bitmap Object creation
bitmap = Bitmap.createBitmap(600,800,Bitmap.Config.RGB_565);
//Create Canvas object and set to bitmap variable
canvas = new Canvas(bitmap);
canvas.drawColor(Color.BLACK);
paint.setColor(Color.BLUE);
paint.setStrokeWidth(50);
imageView.setImageBitmap(bitmap);
up.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick (View v) {
paint.setColor(Color.BLUE);
canvas.drawLine(100,100,100,200,paint);
}
});
Something else I want to look into is drawing multiple lines, and making sure each one lines up to the tip of the last one drawn, similar to this:
This will work for multiple buttons, but I only need it for one button right now. I hope this is sufficient information, please let me know if more is needed

How to toggle picture src of ImageButton

I have an image button and want that when the user clicks on it-it changes its src to a different drawable-but i want the background color i defined in xml to remain the same. Here is the code that i have done so far, but doesnt work, because im changing background and not the source-but general concept i will use:
public void onClick(View view) {
if (bgenabled == true) {
holder.ib.setBackground(res.getDrawable(R.drawable.location_deactive));
bgenabled = false;
} else { holder.ib.setBackground(res.getDrawable(R.drawable.location_active));
bgenabled = false;}

Just call the setImageDrawable to replace the current image you are using
with your ImageButton.
ImageButton button;
...
button.setImageDrawable(getResources().getDrawable(R.drawable.new_image));

Android Button Not moving onclick

I have an up button which I want to move up onClick but when I click on it it moves way to far and gets to the end of the screen and then shrinks down untill you cant see it. It moves up too much, but why? I only increase it by one unit?
final Button upbutton = (Button)findViewById(R.id.upbutton);
upbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
RelativeLayout.LayoutParams mParams = (RelativeLayout.LayoutParams)
upbutton.getLayoutParams();
mParams.bottomMargin += 1;
upbutton.setLayoutParams(mParams);
}
});
}

Because you're not assigning mParams to your buttons params.
mParams = upbutton.getLayoutParams();

You seem to be increasing parameters for your RelativeLayout then assigning those to your button. So the button gets confused. Try looking for a set margin option or something on the actual button view.

Creating buttons and separating there functionality android

my app have action bar on top of windows. Where are some buttons. Buttons count and there functions is changing depending on activity user are.
I want to write a class with methods addFirstButton, removeFirstButton and so on.
So i other classes i want to do this:
MyButtons myButtons = new MyButtons();
myButtons.addFirstButton();
So there is everything alright, but how to create a listener button if i want to do this ?
Normally i would do this:
Button backButton = (Button) customNav.findViewById(R.id.back);
backButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(Action_Bar_TestingActivity.this, "BACK", Toast.LENGTH_SHORT).show();
}
});
But i want that this would be in MyButtons class and method somehow would return a listener to that action.
So any ideas if this possible ?
Thanks.

If you're programming an Action Bar, then you can handle its "buttons" in onOptionsItemSelected(). For more information, see here: http://developer.android.com/guide/topics/ui/menus.html
If you are supporting Android 1.6-2.x, you can make a copy of the ActionBarCompat sample app. It will use some of the same XML flags as >=3.x ActionBar, but not all functionality is emulated. You may also consider using Action Bar Sherlock.
If you want to set and get your onClickListeners, you can. Nothing says you have to instantiate the click listener inside the button. But you'll have to do some bookkeeping. At the least, instantiate the listener outside your button array and pass it in.
Here's how I make a standalone click listener:
Button.OnClickListener mTakePicOnClickListener =
new Button.OnClickListener() {
public void onClick(View v) {
dispatchTakePictureIntent(ACTION_TAKE_PHOTO_B);
}
};
And here's where I attach it to a button (trivial example):
private void setBtnListener(
Button btn,
Button.OnClickListener onClickListener ) {
btn.setOnClickListener(onClickListener);
}
(If you want to see what this function really looks like, it's part of the Capturing Photos sample app.)
But I think you can see how you could use this function internal to MyButtons.

Or the hard way to code:
final Button backButton = null;
final LinearLayout navBar = (LinearLayout) customNav.findViewById(R.id.root);
Button addButton = (Button) customNav.findViewById(R.id.add_button);
addButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
if (backButton == null)
{
backButton = new Button(this);
backButton.setText("Back");
backButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
Toast.makeText(Action_Bar_TestingActivity.this, "BACK", Toast.LENGTH_SHORT).show();
}
});
navBar.addView(backButton);
addButton.setText("Remove Back button");
}
{
navBar.removeView(backButton);
backButton = null;
addButton.setText("Add Back button");
}
}
});

in android, how would you extract the image from a imagebutton?

I have two imagebutton and I want to switch the image of each other so button a will have button b's image while button b will have button a's image. I tried to do this in my code, but it does not work
Bitmap temmp = a1.getDrawingCache();
a1.setImageBitmap(a2.getDrawingCache());
a2.setImageBitmap(temmp);

follow like this
buttona.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
ImageButton ib = (ImageButton)v;
Drawable d11 = ib.getDrawable(); // this is the image u can get from that button
}

You need to enable the drawing cache before calling the getDrawingCache() with setDrawingCacheEnabled(true).