Hi,
I'm sorry if I've missed something obvious but here goes.
I'm currently trying to make an android app where when one moves a
seekbar past a certain value a blue rectangle goes from transparent to
opaque. This rectangle/value pairing will be repeated for roughly 10
values in the seekbar. (Picture the AT&T bars being controlled by a
seekbar). I understand that when I try to change the alpha of my
rectangles (created from a resource in my drawable folder) I'm
changing both of them at the same time. I also understand the solution
to this is by calling mutate on my rectangles. What I'm having trouble
with is actually accomplishing this.
The error I get is: The method mutate() is undefined for the type
Drawable (lines 59 and 61).
I've tried changing my rectangles to ImageView and to ShapeDrawable.
I've also tried modeling it off of the following from one of the
previous posts but that didn't work either.
Drawable star = context.getResources().getDrawable(R.drawable.star);
if (book.isFavorite()) {
star.mutate().setAlpha(255); // opaque
} else {
star.mutate().setAlpha(70); // translucent
Any help would be very, very appreciated.
Thanks,
Erin
Below is all of my code:
package com.artificialmuscle.controllers;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RectShape;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
public class Controllers extends Activity {
/** Called when the activity is first created. */
private final int OPAQUE = 255;
private final int TRANSPARENT = 75;
private MediaPlayer mp = null;
Drawable rect1 = null;
Drawable rect2 = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button1 = (Button)findViewById(R.id.button1);
Button button2 = (Button)findViewById(R.id.button2);
Button button3 = (Button)findViewById(R.id.button3);
button1.setOnClickListener(new OnClickListener(){
public void onClick(View viewParam){createDialogs(1);}});
button2.setOnClickListener(new OnClickListener(){
public void onClick(View viewParam){createDialogs(2);}});
button3.setOnClickListener(new OnClickListener(){
public void onClick(View
viewParam){createDialogs(3);}});
rect1 = (ShapeDrawable)this.getResources().getDrawable
(R.drawable.bluerect);
rect2 = this.getResources().getDrawable(R.id.rect2);
// Ignore the different syntax I was only trying
options
rect1.mutate();
rect1.setAlpha(TRANSPARENT);
rect2.mutate().setAlpha(TRANSPARENT);
SeekBar mySeekBar = (SeekBar)findViewById(R.id.mySeekBar);
mySeekBar.setMax(100);
OnSeekBarChangeListener myListener = new OnSeekBarChangeListener()
{
public void onProgressChanged(SeekBar arg0, int arg1, boolean
arg2) {
// TODO Auto-generated method stub
Log.i("seekbar","seekbar value changed to
"+arg1);
// play sounds on 10, 20.. 90
if (arg1%10 == 0) {
if (mp != null) {
mp.stop();
mp.release();
}
mp =
MediaPlayer.create(Controllers.this, R.raw.sine25hz20ms);
mp.start();
}
//if (arg1 == 10)Log.i("rectangle","I am at
10!!!");
if (arg1 >= 10) {rect1.setAlpha(OPAQUE);}//
Log.i("rectangle","set
rect 1");}
else rect1.setAlpha(TRANSPARENT);
if (arg1 >= 20)
{rect2.setAlpha(OPAQUE);}//Log.i("rectangle","set
rect 2");}
else rect2.setAlpha(TRANSPARENT);
}
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}};
mySeekBar.setOnSeekBarChangeListener(myListener);
}
public void createDialogs(int dialogID){
AlertDialog.Builder builder = new AlertDialog.Builder
(Controllers.this);
//if (dialogID == 1)
switch (dialogID)
{
case 1: builder.setMessage("You clicked Button"+dialogID)
.setNeutralButton("DUH", new
DialogInterface.OnClickListener
() {
public void onClick(DialogInterface
dialog, int id) {
dialog.cancel();
}// onClick
})
.show();
break;
case 2:
builder.setMessage("You clicked me, I am Button"+dialogID)
.setNeutralButton("DUH", new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
id) {
dialog.cancel();
}// onClick
})
.show();
break;
case 3:
builder.setMessage("You clicked me")
.setNeutralButton("DUH", new
DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
id) {
dialog.cancel();
}// onClick
})
.show();
break;
default:
builder.setMessage("I have no idea what you clicked")
.setNeutralButton("Shit", new
DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int
id) {
dialog.cancel();
}// onClick
})
.show();
break;
} // end of switch
}
private class CustomDrawableView extends View {
private ShapeDrawable mDrawable;
public CustomDrawableView(Context context, AttributeSet attrs)
{
super(context, attrs);
int x = 10;
int y = 10;
int width = 300;
int height = 50;
mDrawable = new ShapeDrawable(new RectShape());
mDrawable.getPaint().setColor(0xff74AC23);
mDrawable.setBounds(x, y, x + width, y + height);
}
protected void onDraw(Canvas canvas) {
mDrawable.draw(canvas);
}
}
}
And heres the XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView android:id="@+id/txt"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/intro"/>
<Button android:id="@+id/button1"
android:layout_width="90.0px"
android:layout_height="50.0px"
android:text="Effect 1"
android:layout_alignParentLeft="true"
android:layout_marginLeft="15.0px"
android:layout_marginTop="75.0px"
/>
<Button android:id="@+id/button2"
android:layout_width="90.0px"
android:layout_height="50.0px"
android:text="Effect 2"
android:layout_marginLeft="115.0px"
android:layout_marginTop="75.0px"
/>
<Button android:id="@+id/button3"
android:layout_width="90.0px"
android:layout_height="50.0px"
android:text="Effect 3"
android:layout_alignParentRight="true"
android:layout_marginRight="15.0px"
android:layout_marginTop="75.0px"
/>
<SeekBar android:id="@+id/mySeekBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="350.0px"
/>
<ImageView android:id="@+id/rect1"
android:layout_width="30.0px"
android:layout_height="50.0px"
android:src="@drawable/bluerect"
android:layout_marginTop="275.0px"
android:layout_marginLeft="15.0px"
/>
<ImageView android:id="@+id/rect2"
android:layout_width="30.0px"
android:layout_height="60.0px"
android:src="@drawable/bluerect"
android:layout_marginTop="265.0px"
android:layout_marginLeft="50.0px"
/>
</RelativeLayout>
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