android播放GIF

来源：互联网发布：听电子书的软件编辑：程序博客网时间：2024/05/16 01:32

本人菜鸟，今天看到国外写的android播放gif图片的例子。。与大家分享！也比较简单。类也少就一个！
但是如果gif图片过大（我试过8M），图片边缘就会出现锯齿。如果gif小，那就完全没影响，加载速度也算快！
录制的gif图不太好。

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
/**
* This is a View class that wraps Android {[url=home.php?mod=space&uid=91636]@link[/url] Movie} object and displays it.
* You can set GIF as a Movie object or as a resource id from XML or by calling
* {@link #setMovie(Movie)} or {@link #setMovieResource(int)}.
* <p>
* You can pause and resume GIF animation by calling {@link #setPaused(boolean)}.
* <p>
* The animation is drawn in the center inside of the measured view bounds.
*
* @author Sergey Bakhtiarov
*/
public class GifMovieView extends View {
private static final int DEFAULT_MOVIEW_DURATION = 1000;
private int mMovieResourceId;
private Movie mMovie;
private long mMovieStart;
private int mCurrentAnimationTime = 0;
/**
* Position for drawing animation frames in the center of the view.
*/
private float mLeft;
private float mTop;
/**
* Scaling factor to fit the animation within view bounds.
*/
private float mScale;
/**
* Scaled movie frames width and height.
*/
private int mMeasuredMovieWidth;
private int mMeasuredMovieHeight;
private volatile boolean mPaused = false;
private boolean mVisible = true;
public GifMovieView(Context context) {
this(context, null);
}
public GifMovieView(Context context, AttributeSet attrs) {
this(context, attrs, R.styleable.CustomTheme_gifMoviewViewStyle);
}
public GifMovieView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setViewAttributes(context, attrs, defStyle);
}
@SuppressLint("NewApi")
private void setViewAttributes(Context context, AttributeSet attrs, int defStyle) {
/**
* Starting from HONEYCOMB have to turn off HW acceleration to draw
* Movie on Canvas.
*/
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.GifMoviewView, defStyle,
R.style.Widget_GifMoviewView);
mMovieResourceId = array.getResourceId(R.styleable.GifMoviewView_gif, -1);
mPaused = array.getBoolean(R.styleable.GifMoviewView_paused, false);
array.recycle();
if (mMovieResourceId != -1) {
mMovie = Movie.decodeStream(getResources().openRawResource(mMovieResourceId));
}
}
public void setMovieResource(int movieResId) {
this.mMovieResourceId = movieResId;
mMovie = Movie.decodeStream(getResources().openRawResource(mMovieResourceId));
requestLayout();
}
public void setMovie(Movie movie) {
this.mMovie = movie;
requestLayout();
}
public Movie getMovie() {
return mMovie;
}
public void setMovieTime(int time) {
mCurrentAnimationTime = time;
invalidate();
}
public void setPaused(boolean paused) {
this.mPaused = paused;
/**
* Calculate new movie start time, so that it resumes from the same
* frame.
*/
if (!paused) {
mMovieStart = android.os.SystemClock.uptimeMillis() - mCurrentAnimationTime;
}
invalidate();
}
public boolean isPaused() {
return this.mPaused;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mMovie != null) {
int movieWidth = mMovie.width();
int movieHeight = mMovie.height();
/*
* Calculate horizontal scaling
*/
float scaleH = 1f;
int measureModeWidth = MeasureSpec.getMode(widthMeasureSpec);
if (measureModeWidth != MeasureSpec.UNSPECIFIED) {
int maximumWidth = MeasureSpec.getSize(widthMeasureSpec);
if (movieWidth > maximumWidth) {
scaleH = (float) movieWidth / (float) maximumWidth;
}
}
/*
* calculate vertical scaling
*/
float scaleW = 1f;
int measureModeHeight = MeasureSpec.getMode(heightMeasureSpec);
if (measureModeHeight != MeasureSpec.UNSPECIFIED) {
int maximumHeight = MeasureSpec.getSize(heightMeasureSpec);
if (movieHeight > maximumHeight) {
scaleW = (float) movieHeight / (float) maximumHeight;
}
}
/*
* calculate overall scale
*/
mScale = 1f / Math.max(scaleH, scaleW);
mMeasuredMovieWidth = (int) (movieWidth * mScale);
mMeasuredMovieHeight = (int) (movieHeight * mScale);
setMeasuredDimension(mMeasuredMovieWidth, mMeasuredMovieHeight);
} else {
/*
* No movie set, just set minimum available size.
*/
setMeasuredDimension(getSuggestedMinimumWidth(), getSuggestedMinimumHeight());
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
/*
* Calculate left / top for drawing in center
*/
mLeft = (getWidth() - mMeasuredMovieWidth) / 2f;
mTop = (getHeight() - mMeasuredMovieHeight) / 2f;
mVisible = getVisibility() == View.VISIBLE;
}
@Override
protected void onDraw(Canvas canvas) {
if (mMovie != null) {
if (!mPaused) {
updateAnimationTime();
drawMovieFrame(canvas);
invalidateView();
} else {
drawMovieFrame(canvas);
}
}
}
/**
* Invalidates view only if it is visible.
* <br>
* {@link #postInvalidateOnAnimation()} is used for Jelly Bean and higher.
*
*/
@SuppressLint("NewApi")
private void invalidateView() {
if(mVisible) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
postInvalidateOnAnimation();
} else {
invalidate();
}
}
}
/**
* Calculate current animation time
*/
private void updateAnimationTime() {
long now = android.os.SystemClock.uptimeMillis();
if (mMovieStart == 0) {
mMovieStart = now;
}
int dur = mMovie.duration();
if (dur == 0) {
dur = DEFAULT_MOVIEW_DURATION;
}
mCurrentAnimationTime = (int) ((now - mMovieStart) % dur);
}
/**
* Draw current GIF frame
*/
private void drawMovieFrame(Canvas canvas) {
mMovie.setTime(mCurrentAnimationTime);
canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.scale(mScale, mScale);
mMovie.draw(canvas, mLeft / mScale, mTop / mScale);
canvas.restore();
}
@SuppressLint("NewApi")
@Override
public void onScreenStateChanged(int screenState) {
super.onScreenStateChanged(screenState);
mVisible = screenState == SCREEN_STATE_ON;
invalidateView();
}
@SuppressLint("NewApi")
@Override
protected void onVisibilityChanged(View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
mVisible = visibility == View.VISIBLE;
invalidateView();
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
super.onWindowVisibilityChanged(visibility);
mVisible = visibility == View.VISIBLE;
invalidateView();
}
}

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布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
<font color="#ff0000"> xmlns:custom="http://schemas.android.com/apk/res-auto"</font>
android:layout_width="match_parent"
android:layout_height="match_parent"
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=".MainActivity" >
<com.basv.gifmoviewview.widget.GifMovieView
android:id="@+id/gif"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_centerInParent="true"
<font color="#ff0000"> android:onClick="onGifClick"
custom:gif="@drawable/gif_005"</font> />
</RelativeLayout>

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values/attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="GifMoviewView">
<attr name="gif" format="reference" />
<attr name="paused" format="boolean" />
</declare-styleable>
<declare-styleable name="CustomTheme">
<attr name="gifMoviewViewStyle" format="reference" />
</declare-styleable>
</resources>

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在values/styles里加上
<style name="Widget.GifMoviewView" parent="@android:style/Widget"></style>

接下来是Activity

public class MainActivity extends Activity {
GifMovieView gif;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gif= (GifMovieView) findViewById(R.id.gif);
//可以动态添加
// gif.setMovieResource(R.drawable.gif_005);
}
/*
* 点击gif让其暂停或开始。
* 如果不想要可以去掉xml中的onClick属性
*/
public void onGifClick(View v) {
GifMovieView gif = (GifMovieView) v;
gif.setPaused(!gif.isPaused());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

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1.gif (50.37 KB, 下载次数: 0)

我的地址：http://www.eoeandroid.com/thread-551495-1-1.html

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