Example code:
MainActivity.java
package com.example.androidsetimageopacity;
import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
public class MainActivity extends Activity {
SeekBar barOpacityButton;
SeekBar barOpacityDrawableLeft, barOpacityDrawableTop,
barOpacityDrawableRight, barOpacityDrawableBottom;
Button button;
Drawable drawableLeft, drawableTop, drawableRight, drawableBottom;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawableLeft = getResources()
.getDrawable(android.R.drawable.ic_menu_call);
drawableTop = getResources()
.getDrawable(android.R.drawable.ic_menu_agenda);
drawableRight = getResources()
.getDrawable(android.R.drawable.ic_menu_compass);
drawableBottom = getResources()
.getDrawable(android.R.drawable.ic_menu_camera);
button = (Button)findViewById(R.id.button);
//display CompoundDrawables on Button programmatically
button.setCompoundDrawablesWithIntrinsicBounds(
drawableLeft, drawableTop, drawableRight, drawableBottom);
barOpacityButton =
(SeekBar)findViewById(R.id.opacitybutton);
barOpacityDrawableLeft =
(SeekBar)findViewById(R.id.opacitydrawableleft);
barOpacityDrawableTop =
(SeekBar)findViewById(R.id.opacitydrawabletop);
barOpacityDrawableRight =
(SeekBar)findViewById(R.id.opacitydrawableright);
barOpacityDrawableBottom =
(SeekBar)findViewById(R.id.opacitydrawablebottom);
barOpacityButton.setOnSeekBarChangeListener(
barOpacityButtonOnSeekBarChangeListener);
barOpacityDrawableLeft.setOnSeekBarChangeListener(
barOpacityDrawableOnSeekBarChangeListener);
barOpacityDrawableTop.setOnSeekBarChangeListener(
barOpacityDrawableOnSeekBarChangeListener);
barOpacityDrawableRight.setOnSeekBarChangeListener(
barOpacityDrawableOnSeekBarChangeListener);
barOpacityDrawableBottom.setOnSeekBarChangeListener(
barOpacityDrawableOnSeekBarChangeListener);
}
OnSeekBarChangeListener barOpacityButtonOnSeekBarChangeListener =
new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
float alpha = (float)progress/(float)seekBar.getMax();
button.setAlpha(alpha); //for API Level 11+
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {}
};
OnSeekBarChangeListener barOpacityDrawableOnSeekBarChangeListener =
new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
drawableLeft.setAlpha(
barOpacityDrawableLeft.getProgress());
drawableTop.setAlpha(
barOpacityDrawableTop.getProgress());
drawableRight.setAlpha(
barOpacityDrawableRight.getProgress());
drawableBottom.setAlpha(
barOpacityDrawableBottom.getProgress());
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {}
};
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.androidsetimageopacity.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<SeekBar
android:id="@+id/opacitybutton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="100"
android:progress="100"/>
<SeekBar
android:id="@+id/opacitydrawableleft"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="255"/>
<SeekBar
android:id="@+id/opacitydrawabletop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="255"/>
<SeekBar
android:id="@+id/opacitydrawableright"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="255"/>
<SeekBar
android:id="@+id/opacitydrawablebottom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="255"
android:progress="255"/>
<TextView
android:id="@+id/opacitysetting"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Opacity Button"/>
</LinearLayout>
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