Android example source code file (AnimatedRotateDrawable.java)

This example Android source code file (AnimatedRotateDrawable.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, animatable, animatedrotatedrawable, animatedrotatestate, bad, bitmapdrawable, constantstate, drawable, drawing, graphics, no, override, paint, resources, runnable, typedvalue, ui, util, xmlpullparser, xmlpullparserexception

The AnimatedRotateDrawable.java Android example source code

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.graphics.drawable;

import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.ColorFilter;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.util.Log;
import android.os.SystemClock;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;

import com.android.internal.R;

/**
 * @hide
 */
public class AnimatedRotateDrawable extends Drawable implements Drawable.Callback, Runnable,
        Animatable {

    private AnimatedRotateState mState;
    private boolean mMutated;
    private float mCurrentDegrees;
    private float mIncrement;
    private boolean mRunning;

    public AnimatedRotateDrawable() {
        this(null, null);
    }

    private AnimatedRotateDrawable(AnimatedRotateState rotateState, Resources res) {
        mState = new AnimatedRotateState(rotateState, this, res);
        init();
    }

    private void init() {
        final AnimatedRotateState state = mState;
        mIncrement = 360.0f / (float) state.mFramesCount;
        final Drawable drawable = state.mDrawable;
        if (drawable != null) {
            drawable.setFilterBitmap(true);
            if (drawable instanceof BitmapDrawable) {
                ((BitmapDrawable) drawable).setAntiAlias(true);
            }
        }
    }

    public void draw(Canvas canvas) {
        int saveCount = canvas.save();

        final AnimatedRotateState st = mState;
        final Drawable drawable = st.mDrawable;
        final Rect bounds = drawable.getBounds();

        int w = bounds.right - bounds.left;
        int h = bounds.bottom - bounds.top;

        float px = st.mPivotXRel ? (w * st.mPivotX) : st.mPivotX;
        float py = st.mPivotYRel ? (h * st.mPivotY) : st.mPivotY;

        canvas.rotate(mCurrentDegrees, px, py);

        drawable.draw(canvas);

        canvas.restoreToCount(saveCount);
    }

    public void start() {
        if (!mRunning) {
            mRunning = true;
            nextFrame();
        }
    }

    public void stop() {
        mRunning = false;
        unscheduleSelf(this);
    }

    public boolean isRunning() {
        return mRunning;
    }

    private void nextFrame() {
        unscheduleSelf(this);
        scheduleSelf(this, SystemClock.uptimeMillis() + mState.mFrameDuration);
    }
    
    public void run() {
        // TODO: This should be computed in draw(Canvas), based on the amount
        // of time since the last frame drawn 
        mCurrentDegrees += mIncrement;
        if (mCurrentDegrees > (360.0f - mIncrement)) {
            mCurrentDegrees = 0.0f;
        }
        invalidateSelf();
        nextFrame();
    }
    
    @Override
    public boolean setVisible(boolean visible, boolean restart) {
        mState.mDrawable.setVisible(visible, restart);
        boolean changed = super.setVisible(visible, restart);
        if (visible) {
            if (changed || restart) {
                mCurrentDegrees = 0.0f;
                nextFrame();
            }
        } else {
            unscheduleSelf(this);
        }
        return changed;
    }    
    
    /**
     * Returns the drawable rotated by this RotateDrawable.
     */
    public Drawable getDrawable() {
        return mState.mDrawable;
    }

    @Override
    public int getChangingConfigurations() {
        return super.getChangingConfigurations()
                | mState.mChangingConfigurations
                | mState.mDrawable.getChangingConfigurations();
    }
    
    public void setAlpha(int alpha) {
        mState.mDrawable.setAlpha(alpha);
    }

    public void setColorFilter(ColorFilter cf) {
        mState.mDrawable.setColorFilter(cf);
    }

    public int getOpacity() {
        return mState.mDrawable.getOpacity();
    }

    public void invalidateDrawable(Drawable who) {
        if (mCallback != null) {
            mCallback.invalidateDrawable(this);
        }
    }

    public void scheduleDrawable(Drawable who, Runnable what, long when) {
        if (mCallback != null) {
            mCallback.scheduleDrawable(this, what, when);
        }
    }

    public void unscheduleDrawable(Drawable who, Runnable what) {
        if (mCallback != null) {
            mCallback.unscheduleDrawable(this, what);
        }
    }

    @Override
    public boolean getPadding(Rect padding) {
        return mState.mDrawable.getPadding(padding);
    }
    
    @Override
    public boolean isStateful() {
        return mState.mDrawable.isStateful();
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        mState.mDrawable.setBounds(bounds.left, bounds.top, bounds.right, bounds.bottom);
    }

    @Override
    public int getIntrinsicWidth() {
        return mState.mDrawable.getIntrinsicWidth();
    }

    @Override
    public int getIntrinsicHeight() {
        return mState.mDrawable.getIntrinsicHeight();
    }

    @Override
    public ConstantState getConstantState() {
        if (mState.canConstantState()) {
            mState.mChangingConfigurations = super.getChangingConfigurations();
            return mState;
        }
        return null;
    }

    @Override
    public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs)
            throws XmlPullParserException, IOException {

        final TypedArray a = r.obtainAttributes(attrs, R.styleable.AnimatedRotateDrawable);

        super.inflateWithAttributes(r, parser, a, R.styleable.AnimatedRotateDrawable_visible);
        
        TypedValue tv = a.peekValue(R.styleable.AnimatedRotateDrawable_pivotX);
        final boolean pivotXRel = tv.type == TypedValue.TYPE_FRACTION;
        final float pivotX = pivotXRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat();
        
        tv = a.peekValue(R.styleable.AnimatedRotateDrawable_pivotY);
        final boolean pivotYRel = tv.type == TypedValue.TYPE_FRACTION;
        final float pivotY = pivotYRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat();
        
        final int framesCount = a.getInt(R.styleable.AnimatedRotateDrawable_framesCount, 12);
        final int frameDuration = a.getInt(R.styleable.AnimatedRotateDrawable_frameDuration, 150);
        
        final int res = a.getResourceId(R.styleable.AnimatedRotateDrawable_drawable, 0);
        Drawable drawable = null;
        if (res > 0) {
            drawable = r.getDrawable(res);
        }

        a.recycle();
        
        int outerDepth = parser.getDepth();
        int type;
        while ((type = parser.next()) != XmlPullParser.END_DOCUMENT &&
               (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) {

            if (type != XmlPullParser.START_TAG) {
                continue;
            }

            if ((drawable = Drawable.createFromXmlInner(r, parser, attrs)) == null) {
                Log.w("drawable", "Bad element under <animated-rotate>: "
                        + parser .getName());
            }
        }

        if (drawable == null) {
            Log.w("drawable", "No drawable specified for <animated-rotate>");
        }

        final AnimatedRotateState rotateState = mState;
        rotateState.mDrawable = drawable;
        rotateState.mPivotXRel = pivotXRel;
        rotateState.mPivotX = pivotX;
        rotateState.mPivotYRel = pivotYRel;
        rotateState.mPivotY = pivotY;
        rotateState.mFramesCount = framesCount;
        rotateState.mFrameDuration = frameDuration;

        init();

        if (drawable != null) {
            drawable.setCallback(this);
        }
    }

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

    final static class AnimatedRotateState extends Drawable.ConstantState {
        Drawable mDrawable;

        int mChangingConfigurations;
        
        boolean mPivotXRel;
        float mPivotX;
        boolean mPivotYRel;
        float mPivotY;
        int mFrameDuration;
        int mFramesCount;

        private boolean mCanConstantState;
        private boolean mCheckedConstantState;        

        public AnimatedRotateState(AnimatedRotateState source, AnimatedRotateDrawable owner,
                Resources res) {
            if (source != null) {
                if (res != null) {
                    mDrawable = source.mDrawable.getConstantState().newDrawable(res);
                } else {
                    mDrawable = source.mDrawable.getConstantState().newDrawable();
                }
                mDrawable.setCallback(owner);
                mPivotXRel = source.mPivotXRel;
                mPivotX = source.mPivotX;
                mPivotYRel = source.mPivotYRel;
                mPivotY = source.mPivotY;
                mFramesCount = source.mFramesCount;
                mFrameDuration = source.mFrameDuration;
                mCanConstantState = mCheckedConstantState = true;
            }
        }

        @Override
        public Drawable newDrawable() {
            return new AnimatedRotateDrawable(this, null);
        }
        
        @Override
        public Drawable newDrawable(Resources res) {
            return new AnimatedRotateDrawable(this, res);
        }
        
        @Override
        public int getChangingConfigurations() {
            return mChangingConfigurations;
        }

        public boolean canConstantState() {
            if (!mCheckedConstantState) {
                mCanConstantState = mDrawable.getConstantState() != null;
                mCheckedConstantState = true;
            }

            return mCanConstantState;
        }
    }
}