Develop Reference

Dynamically recolor activity background before showing it

I need to set custom color both to actionbar and to client area. With the following code my app get succesfully colored, however, I still see the default theme for like 0.5 seconds when the activity starts. How do I remove this gap?
The color is set dynamically, so I guess I cannot use theme definition here. (I will later change my code to get color from an Intent)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_note_screen);
setNoteColor(0xFFFFF8DC);
}
public void setNoteColor(int color) {
getWindow().getDecorView().setBackground(new ColorDrawable(color));
assert getActionBar() != null;
getActionBar().setBackgroundDrawable(new ColorDrawable(color));
}

Funny thing I just read about that yesterday... =)
Here is a great post regarding you issue

dynamically set size of indeterminate ProgressBar on ActionBar

I implemented Progress Bar on action bar during network call but displaying the progress Bar on Action Bar is too large. I want to set dynamic size of progressbar. I searched lot but not achieve my goal.so following is the code for ActionBar ProgressBar. Please anybody suggest me some answer and anybody having another way to do above task please tell me.
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); }
protected void onPreExecute() {
// Show IndeterminateProgressBar
setSupportProgressBarIndeterminateVisibility(true); }
protected void onPostExecute(Void result) {
setSupportProgressBarIndeterminateVisibility(false);}
Thanks In Advance

Set a Timer and use LayoutParams to change the size.
{ParentLayout}.LayoutParams params = new {ParentLayout}.LayoutParams(h,w);
progressBar.setLayoutParams(params);
And use the built-in java Timer to time it.

Android: Title bar onclick launcher icon

I'd like to add an onclick listener to my launcer icon in the title bar of my app.
Since i'm also supporting API level 8 i do not have an Action bar.
The following code works great, however the menu is set back to default (white background, white text, small icon etc.)
The code:
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_LEFT_ICON);
setContentView(R.layout.activity_main);
getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON,R.drawable.ic_launcher);
View v = findViewById (android.R.id.title);
v.setClickable(true);
v.setOnClickListener(new OnClickListener() {
#Override public void onClick(View v) {
Toast.makeText(MainActivity.this, "Works!", Toast.LENGTH_SHORT).show();
}
});
}
}
source: adding click listener to titlebar image
How can I keep my standard layout of my title bar (black background color, white text and large icon), while also implement this onclick listener?
Here are two shots of the different layouts:
good: http://gyazo.com/40d1cdd5302de3cd28b698b68164a556
bad: http://gyazo.com/3cee42524ec4167392baec6cc2369584
(Note that the good one is also has a greater height)

Show progress dialog while adding views dynamically to scrollview in android

In the start of an activity in OnCreate method, I'm trying to add some text views dynamically to a scrollview of the layout file. But during the time of this operation the screen remains blank. Is it possible to show a progress dialog when adding views dynamically to a scrollview?

You should use a AsyncTask for that. Please post some code you're having in your onCreate method at the moment.

#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.lottery);
for(i = 0; i < 20; i++) {
TextView txt = new TextView(this);
scrolview.addView(txt);
}
}
The code is similar to this...can u explain how to put a progress dialog...in this sample using AsyncTask...where should i perform this operation doInBackground method or on postExecute?

How can we display progress icon in button

I need to display progress icon in button so that user can interact other GUI elements while background task is processing.
I have searched in Android developer site and found that we can use animated drawables but don't know how to use them. Please advise on the same.

The very simple way to do this without using the animated drawable is to use "PregressBar" component in the design layout xml. When u need to show it, just set it's visibility property to visible and when you need to hide it, u can set it's visibility property to GONE. But remember this is UI task so when u need to do this with non-UI thread, u need to use Handler to set the status of "ProgressBar" component at runtime.
Below id the component in the layout file.
<ProgressBar
android:id="#+id/progressBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</ProgressBar>
Below is the code written in java file
ProgressBar prg;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main1);
prg=(ProgressBar)findViewById(R.id.ProgressBar1);
prg.setVisibility(ProgressBar.GONE);
}
public void start_background_process()
{
// starting the process
prg.setVisibility(ProgressBar.VISIBLE);
new Thread(new Runnable()
{ public void run()
{
// Do your background stuff here which takes indefinite time
mHandlerUpdateProgress.post(mUpdateUpdateProgress);
}
} ).start();
}
final Handler mHandlerUpdateProgress= new Handler();
final Runnable mUpdateUpdateProgress = new Runnable() {
public void run() {
// ending the process
prg.setVisibility(ProgressBar.GONE);
}
};

If the default progress indicator is good enough for you (i.e. the spinning wheel), then you can just use ProgressBar. To change it from a normal progress bar to a spinning wheel, use progressBar.setIndeterminate(true).