Drawable Animation Example In Android Programming

This example explains how you can animate your drawbles.

Algorithm:

1.) Create a new project by File-> New -> Android Project name it DrawableAnimationExample.

2.) Create and write following into GraphicsActivity.java:

 

package com.example.DrawableAnimationExample;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;

class GraphicsActivity extends Activity {

private static final boolean TEST_PICTURE = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}

@Override
public void setContentView(View view) {
if (TEST_PICTURE) {
ViewGroup vg = new PictureLayout(this);
vg.addView(view);
view = vg;
}

super.setContentView(view);
}
}

 

 

3.) Write following into PictureLayout.java:

 

package com.example.DrawableAnimationExample;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Picture;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;

public class PictureLayout extends ViewGroup {
private final Picture mPicture = new Picture();

public PictureLayout(Context context) {
super(context);
}

public PictureLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}

@Override
public void addView(View child) {
if (getChildCount() > 1) {
throw new IllegalStateException("PictureLayout can host only one direct child");
}

super.addView(child);
}

@Override
public void addView(View child, int index) {
if (getChildCount() > 1) {
throw new IllegalStateException("PictureLayout can host only one direct child");
}

super.addView(child, index);
}

@Override
public void addView(View child, LayoutParams params) {
if (getChildCount() > 1) {
throw new IllegalStateException("PictureLayout can host only one direct child");
}

super.addView(child, params);
}

@Override
public void addView(View child, int index, LayoutParams params) {
if (getChildCount() > 1) {
throw new IllegalStateException("PictureLayout can host only one direct child");
}

super.addView(child, index, params);
}

@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int count = getChildCount();

int maxHeight = 0;
int maxWidth = 0;

for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
measureChild(child, widthMeasureSpec, heightMeasureSpec);
}
}

maxWidth += getPaddingLeft() + getPaddingRight();
maxHeight += getPaddingTop() + getPaddingBottom();

Drawable drawable = getBackground();
if (drawable != null) {
maxHeight = Math.max(maxHeight, drawable.getMinimumHeight());
maxWidth = Math.max(maxWidth, drawable.getMinimumWidth());
}

setMeasuredDimension(resolveSize(maxWidth, widthMeasureSpec),
resolveSize(maxHeight, heightMeasureSpec));
}

private void drawPict(Canvas canvas, int x, int y, int w, int h,
float sx, float sy) {
canvas.save();
canvas.translate(x, y);
canvas.clipRect(0, 0, w, h);
canvas.scale(0.5f, 0.5f);
canvas.scale(sx, sy, w, h);
canvas.drawPicture(mPicture);
canvas.restore();
}

@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(mPicture.beginRecording(getWidth(), getHeight()));
mPicture.endRecording();

int x = getWidth()/2;
int y = getHeight()/2;

if (false) {
canvas.drawPicture(mPicture);
} else {
drawPict(canvas, 0, 0, x, y, 1, 1);
drawPict(canvas, x, 0, x, y, -1, 1);
drawPict(canvas, 0, y, x, y, 1, -1);
drawPict(canvas, x, y, x, y, -1, -1);
}
}

@Override
public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
location[0] = getLeft();
location[1] = getTop();
dirty.set(0, 0, getWidth(), getHeight());
return getParent();
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int count = super.getChildCount();

for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final int childLeft = getPaddingLeft();
final int childTop = getPaddingTop();
child.layout(childLeft, childTop,
childLeft + child.getMeasuredWidth(),
childTop + child.getMeasuredHeight());

}
}
}
}

 

 

4.) Write following into AnimateDrawable.java:

 

package com.example.DrawableAnimationExample;

import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Transformation;

public class AnimateDrawable extends ProxyDrawable {

private Animation mAnimation;
private Transformation mTransformation = new Transformation();

public AnimateDrawable(Drawable target) {
super(target);
}

public AnimateDrawable(Drawable target, Animation animation) {
super(target);
mAnimation = animation;
}

public Animation getAnimation() {
return mAnimation;
}

public void setAnimation(Animation anim) {
mAnimation = anim;
}

public boolean hasStarted() {
return mAnimation != null && mAnimation.hasStarted();
}

public boolean hasEnded() {
return mAnimation == null || mAnimation.hasEnded();
}

@Override
public void draw(Canvas canvas) {
Drawable dr = getProxy();
if (dr != null) {
int sc = canvas.save();
Animation anim = mAnimation;
if (anim != null) {
anim.getTransformation(
AnimationUtils.currentAnimationTimeMillis(),
mTransformation);
canvas.concat(mTransformation.getMatrix());
}
dr.draw(canvas);
canvas.restoreToCount(sc);
}
}
}

 

 

5.) Write following into ProxyDrawable.java:

 

package com.example.DrawableAnimationExample;

import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;

public class ProxyDrawable extends Drawable {

private Drawable mProxy;
private boolean mMutated;

public ProxyDrawable(Drawable target) {
mProxy = target;
}

public Drawable getProxy() {
return mProxy;
}

public void setProxy(Drawable proxy) {
if (proxy != this) {
mProxy = proxy;
}
}

@Override
public void draw(Canvas canvas) {
if (mProxy != null) {
mProxy.draw(canvas);
}
}

@Override
public int getIntrinsicWidth() {
return mProxy != null ? mProxy.getIntrinsicWidth() : -1;
}

@Override
public int getIntrinsicHeight() {
return mProxy != null ? mProxy.getIntrinsicHeight() : -1;
}

@Override
public int getOpacity() {
return mProxy != null ? mProxy.getOpacity() : PixelFormat.TRANSPARENT;
}

@Override
public void setFilterBitmap(boolean filter) {
if (mProxy != null) {
mProxy.setFilterBitmap(filter);
}
}

@Override
public void setDither(boolean dither) {
if (mProxy != null) {
mProxy.setDither(dither);
}
}

@Override
public void setColorFilter(ColorFilter colorFilter) {
if (mProxy != null) {
mProxy.setColorFilter(colorFilter);
}
}

@Override
public void setAlpha(int alpha) {
if (mProxy != null) {
mProxy.setAlpha(alpha);
}
}

@Override
public Drawable mutate() {
if (mProxy != null && !mMutated && super.mutate() == this) {
mProxy.mutate();
mMutated = true;
}
return this;
}
}

 

 

6.) Run for output.

Steps:

1.) Create a project named DrawableAnimationExample and set the information as stated in the image.

Build Target: Android 4.0
Application Name: DrawableAnimationExample
Package Name: com. example. DrawableAnimationExample
Activity Name: DrawableAnimationExample
Min SDK Version: 14

2.) Open DrawableAnimationExample.java file and write following code there:

 

package com.example.DrawableAnimationExample;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;

public class DrawableAnimationExample extends GraphicsActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}

private static class SampleView extends View {
private AnimateDrawable mDrawable;

public SampleView(Context context) {
super(context);
setFocusable(true);
setFocusableInTouchMode(true);

Drawable dr = context.getResources().getDrawable(R.drawable.android);
dr.setBounds(0, 0, dr.getIntrinsicWidth(), dr.getIntrinsicHeight());

Animation an = new TranslateAnimation(0, 100, 0, 200);
an.setDuration(2000);
an.setRepeatCount(-1);
an.initialize(10, 10, 10, 10);

mDrawable = new AnimateDrawable(dr, an);
an.startNow();
}

@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);

mDrawable.draw(canvas);
invalidate();
}
}
}

 

 

3.) Compile and build the project.

Output

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android tutorial drawable - pdfenter.com says January 22, 2015

[…] 1.) Create a new project by File-> New -> Android Project name it DrawableAnimationExample. Download Drawable Animation Example in Android programming […]

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