As I was thinking about how I would go about doing this, I remembered something kind of similar that I did. Here is a snippet of the XML I used...
<ImageView android:id="@+id/wgt_app_icon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/widget_icon_selector" android:src="@drawable/widget_icon" /> The two most important things to notice are the android:background and android:src properties... The first is obvious and the second is essentially "foreground." You would need to have the files for each property in your res/drawable folder. In my particular case it was widget_icon_selector.xml and widget_icon.png but they can be any valid drawable type... including two images. Assuming you are in an Activity class (or sub-class), you would get access to the ImageView as follows: ImageView view = (ImageView) findViewById(R.id.wgt_app_icon); Hope that helps, Justin ---------------------------------------------------------------------- There are only 10 types of people in the world... Those who know binary and those who don't. ---------------------------------------------------------------------- On Tue, Jan 5, 2010 at 11:14 AM, keith greene <[email protected]>wrote: > Well, I don't have that code anymore, I moved on to trying to create the > bitmaps programmatically. I can do that, but as I stated, I can't for the > life of me, figure out how to position the 2 parts at all or control which > one appears on top of the other. Here's the code I'm trying now: > > package com.kgreene.gauge; > > import android.app.Activity; > import android.os.Bundle; > import android.view.View; > import android.widget.LinearLayout; > import android.graphics.Bitmap; > import android.graphics.BitmapFactory; > import android.graphics.drawable.BitmapDrawable; > import android.graphics.Matrix; > import android.widget.ImageView; > import android.widget.LinearLayout.LayoutParams; > import android.widget.ImageView.ScaleType; > > public class gauge extends Activity { > @Override > public void onCreate(Bundle icicle) { > super.onCreate(icicle); > LinearLayout linLayout = new LinearLayout(this); > > Bitmap bmSpeedGauge = BitmapFactory.decodeResource(getResources(), > R.drawable.speedo); > BitmapDrawable sGauge = new BitmapDrawable(bmSpeedGauge); > > ImageView sgView = new ImageView(this); > > // set the Drawable on the ImageView > sgView.setImageDrawable(sGauge); > > // center the Image > sgView.setScaleType(ScaleType.CENTER); > > // load the origial BitMap > Bitmap bmSpeedNeedle = BitmapFactory.decodeResource(getResources(), > R.drawable.speed_needle); > > int width = bmSpeedNeedle.getWidth(); > int height = bmSpeedNeedle.getHeight(); > int newWidth = 48; > int newHeight = 212; > > // calculate the scale - in this case = 0.4f > float scaleWidth = ((float) newWidth) / width; > float scaleHeight = ((float) newHeight) / height; > > // createa matrix for the manipulation > Matrix matrix = new Matrix(); > // resize the bit map > matrix.postScale(scaleWidth, scaleHeight); > // rotate the Bitmap > matrix.postRotate(45, 24, 180); > > // recreate the new Bitmap > Bitmap rbmSpeedNeedle = Bitmap.createBitmap(bmSpeedNeedle, 0, 0, > width, height, matrix, true); > > // make a Drawable from Bitmap to allow to set the BitMap > // to the ImageView, ImageButton or what ever > BitmapDrawable bmd = new BitmapDrawable(rbmSpeedNeedle); > > ImageView imageView = new ImageView(this); > > // set the Drawable on the ImageView > imageView.setImageDrawable(bmd); > > // center the Image > imageView.setScaleType(ScaleType.CENTER); > > // add sgView to the Layout > linLayout.addView(sgView, > new LinearLayout.LayoutParams( > 433, 433 > ) > ); > // add ImageView to the Layout > linLayout.addView(imageView, > new LinearLayout.LayoutParams( > 48, 212 > ) > ); > > // set LinearLayout as ContentView > setContentView(linLayout); > } > } > > Screenshot: http://kgreene.com/android/gauge.jpg > > As you can see, the needle is drawn to the right of the gauge face, and > slightly underneath it. > I realize that I shouldn't expect them to magically appear stacked properly > because I'm not trying to position them at all, and that is part of the > problem. I haven't seen anything that explains how to position or layer > bitmaps at all, aside from very vague references to using linearLayout or > gridLayout. Also note that I'm coming from a web development background, and > this is my first experience with java of any kind. I'm used to being able to > position things exactly where I want them, very easily, with CSS or > javascript. > Basically, I'm looking for the android equivalent of the css properties > top, left and z-index. > > Also, if you can point me to an example of number 2 below (creating the > elements in XML and then accessing them programmatically) that would be > great, as that seems to be preferable to creating everything in code. > > Thanks, > Keith > > On Mon, Jan 4, 2010 at 10:32 PM, Justin Anderson > <[email protected]>wrote: > >> Please post your XML file and the code you are using to access the >> different parts of it... >> >> ---------------------------------------------------------------------- >> There are only 10 types of people in the world... >> Those who know binary and those who don't. >> ---------------------------------------------------------------------- >> >> >> On Thu, Dec 31, 2009 at 1:09 PM, keith <[email protected]> wrote: >> >>> Hello all, >>> I'm very new to android development, and I'm coming from a php/web >>> development background. For my first exercise, I'm trying to draw a >>> gauge face and a needle, and be able to rotate that needle to whatever >>> direction I want (not dynamically, just by changing the angle in code >>> and recompiling) >>> I'm running into a problem that is 2-fold: >>> >>> 1, If I build the layout programmatically using LinearLayout, I can >>> rotate the needle, but I cannot manage to get the needle to sit in the >>> proper position on top of the gauge, in fact, I can't seem to be able >>> to control the position of either image at all. I looked into using >>> AbsoluteLayout, but that is depricated. >>> >>> 2. If I use the xml layout, I can position the gauge and needle >>> exactly where I want them, but I cannot seem to access the needle >>> programmatically to rotate it. I have tried setting android:@+id and >>> using getById, but that doesn't do anything, although it doesn't throw >>> an error either. >>> >>> Does anyone have any tips or references or examples on how to >>> accomplish this seemingly easy task? >>> >>> Thanks, >>> Keith >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Android Beginners" group. >>> >>> NEW! Try asking and tagging your question on Stack Overflow at >>> http://stackoverflow.com/questions/tagged/android >>> >>> To unsubscribe from this group, send email to >>> [email protected]<android-beginners%[email protected]> >>> For more options, visit this group at >>> http://groups.google.com/group/android-beginners?hl=en >>> >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Android Beginners" group. >> >> NEW! Try asking and tagging your question on Stack Overflow at >> http://stackoverflow.com/questions/tagged/android >> >> To unsubscribe from this group, send email to >> [email protected]<android-beginners%[email protected]> >> For more options, visit this group at >> http://groups.google.com/group/android-beginners?hl=en >> > > > -- > You received this message because you are subscribed to the Google > Groups "Android Beginners" group. > > NEW! Try asking and tagging your question on Stack Overflow at > http://stackoverflow.com/questions/tagged/android > > To unsubscribe from this group, send email to > [email protected]<android-beginners%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-beginners?hl=en > >
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