Android加载Gif动画实现代码
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2024-03-03 22:27:34
android加载gif动画如何实现?相信大家都很好奇,本文就为大家揭晓,内容如下
android加载gif动画如何实现?相信大家都很好奇,本文就为大家揭晓,内容如下
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <com.example.gifdemo.gifview android:id="@+id/gif1" android:layout_width="100dp" android:layout_height="100dp" android:layout_gravity="center_horizontal" android:enabled="false" /> </linearlayout>
<declare-styleable name="gifview"> <attr name="gif" format="reference" /> <attr name="paused" format="boolean" /> </declare-styleable>
主界面
package com.example.gifdemo; import android.app.activity; import android.os.bundle; public class mainactivity extends activity { private gifview gif1; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); gif1 = (gifview) findviewbyid(r.id.gif1); // 设置背景gif图片资源 gif1.setmovieresource(r.raw.red); } }
自定义view
package com.example.gifdemo; import android.annotation.suppresslint; import android.content.context; import android.content.res.typedarray; import android.graphics.canvas; import android.graphics.color; import android.graphics.movie; import android.os.build; import android.util.attributeset; import android.view.view; public class gifview extends view { /** * 默认为1秒 */ private static final int default_movie_duration = 1000; private int mmovieresourceid; private movie mmovie; private long mmoviestart; private int mcurrentanimationtime = 0; private float mleft; private float mtop; private float mscale; private int mmeasuredmoviewidth; private int mmeasuredmovieheight; private boolean mvisible = true; private volatile boolean mpaused = false; /** * 构造函数 */ public gifview(context context) { this(context, null); } public gifview(context context, attributeset attrs) { this(context, attrs,0); } public gifview(context context, attributeset attrs, int defstyle) { super(context, attrs, defstyle); setviewattributes(context, attrs, defstyle); setbackgroundcolor(color.parsecolor("#ffb6c1")); } @suppresslint("newapi") private void setviewattributes(context context, attributeset attrs, int defstyle) { if (build.version.sdk_int >= build.version_codes.honeycomb) { setlayertype(view.layer_type_software, null); } // 从描述文件中读出gif的值,创建出movie实例 final typedarray array = context.obtainstyledattributes(attrs, r.styleable.gifview); mmovieresourceid = array.getresourceid(r.styleable.gifview_gif, -1); mpaused = array.getboolean(r.styleable.gifview_paused, false); array.recycle(); if (mmovieresourceid != -1) { mmovie = movie.decodestream(getresources().openrawresource( mmovieresourceid)); } } /** * 设置gif图资源 */ public void setmovieresource(int movieresid) { this.mmovieresourceid = movieresid; mmovie = movie.decodestream(getresources().openrawresource( mmovieresourceid)); requestlayout(); } @override protected void onmeasure(int widthmeasurespec, int heightmeasurespec) { if (mmovie != null) { //gif动画的宽度、高度 int moviewidth = mmovie.width(); int movieheight = mmovie.height(); //控件的宽度 int maximumwidth = measurespec.getsize(widthmeasurespec); //gif图片宽/控件宽 float scalew = (float) moviewidth / (float) maximumwidth; mscale = 1f / scalew; mmeasuredmoviewidth = maximumwidth; mmeasuredmovieheight = (int) (movieheight * mscale); setmeasureddimension(mmeasuredmoviewidth, mmeasuredmovieheight); } else { setmeasureddimension(getsuggestedminimumwidth(), getsuggestedminimumheight()); } } // @override // protected void onlayout(boolean changed, int l, int t, int r, int b) { // super.onlayout(changed, l, t, r, b); // 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); } } } private void updateanimationtime() { long now = android.os.systemclock.uptimemillis(); // 如果第一帧,记录起始时间 if (mmoviestart == 0) { mmoviestart = now; } // 取出动画的时长 int dur = mmovie.duration(); if (dur == 0) { dur = default_movie_duration; } // 算出需要显示第几帧 mcurrentanimationtime = (int) ((now - mmoviestart) % dur); } private void drawmovieframe(canvas canvas) { // 设置要显示的帧,绘制即可 mmovie.settime(mcurrentanimationtime); canvas.save(canvas.matrix_save_flag); canvas.scale(mscale, mscale); mmovie.draw(canvas, mleft / mscale, mtop / mscale); canvas.restore(); } @suppresslint("newapi") private void invalidateview() { if (mvisible) { if (build.version.sdk_int >= build.version_codes.jelly_bean) { postinvalidateonanimation(); } else { invalidate(); } } } // --------------------以下方法未调用------------------------------------/ 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; if (!paused) { mmoviestart = android.os.systemclock.uptimemillis() - mcurrentanimationtime; } invalidate(); } public boolean ispaused() { return this.mpaused; } @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(); } // --------------------------------------------------------/ }
源码下载:http://xiazai.jb51.net/201610/yuanma/androidgifdemo(jb51.net).rar
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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