将动画 .GIF 设置为背景 Android
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【中文标题】将动画 .GIF 设置为背景 Android【英文标题】:Set Animated .GIF As Background Android 【发布时间】:2013-03-28 09:33:23 【问题描述】:我是 android 新手,在我的布局背景中播放动画 .gif 文件时遇到问题。当我运行应用程序时,背景是动画 .gif 的单帧,就像图片一样。我主要做了两个方面的研究:
下面的链接是我得到最多帮助的地方。
Android OS Beginning BlogSpot
下面的链接让我认为我收到的错误与设置为私有、公共或受保护的类有关。
Java Forums
这是代码 ------------------------------------------- -------------------------------------------------- ----------------------
错误由 :: ERROR # :: 表示,代码下方有完整描述。
import java.io.InputStream;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Movie;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(new MYGIFView()); :: ERROR 1 ::
private class MYGIFView extends View :: ERROR 2 ::
Movie movie,movie1;
InputStream is=null , is1=null;
long moviestart;
public GIFView(Context context) :: ERROR 3 ::
super(context); :: ERROR 4 ::
is=context.getResources().openRawResource(R.drawable.swing);
movie=Movie.decodeStream(is);
@Override
protected void onDraw(Canvas canvas)
canvas.drawColor(Color.WHITE);
super.onDraw(canvas);
long now=android.os.SystemClock.uptimeMillis();
System.out.println("now="+now);
if (moviestart == 0) // first time
moviestart = now;
System.out.println("\tmoviestart="+moviestart);
int relTime = (int)((now - moviestart) % movie.duration()) ;
System.out.println("time="+relTime+"\treltime="+movie.duration());
movie.setTime(relTime);
movie.draw(canvas,this.getWidth()/2-20,this.getHeight()/2-40);
this.invalidate();
:: 错误列表 :: 错误列表 :: 错误列表 :: 错误列表 :: 错误列表 :: 错误列表 ::
:: ERROR 1 :: 构造函数 MYGIFView() 不可见
:: ERROR 2 :: Implicit Super Constructor View() 未定义可见构造函数
:: ERROR 3 :: 方法的返回类型丢失
:: ERROR 4 :: 构造函数调用必须是构造函数中的第一条语句
.
.
--------- 更新 --------- 更新 ------------ 更新 ------------- -- 更新 ------------- 更新 ---------- 更新 --------- 更新 ------------更新 --------------- 更新 ------------- 更新 --------- 更新
.
.
我已经创建了动画列表 = res/drawable-hdpi/progress_animation.xml
<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/selected" android:oneshot="false">
<item android:drawable="@drawable/frame02" android:duration="50" />
<item android:drawable="@drawable/frame03" android:duration="50" />
<item android:drawable="@drawable/frame04" android:duration="50" />
<item android:drawable="@drawable/frame05" android:duration="50" />
<item android:drawable="@drawable/frame06" android:duration="50" />
<item android:drawable="@drawable/frame07" android:duration="50" />
<item android:drawable="@drawable/frame08" android:duration="50" />
<item android:drawable="@drawable/frame09" android:duration="50" />
<item android:drawable="@drawable/frame10" android:duration="50" />
.........................................
<item android:drawable="@drawable/frame57" android:duration="50" />
<item android:drawable="@drawable/frame58" android:duration="50" />
</animation-list>
.
.
我创建了布局文件来托管图像视图 = res/layout/activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
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" >
<ImageView android:id="@+id/swing_play" android:layout_
android:layout_ />
</RelativeLayout>
.
Java类Activity调用ImageView和AnimationDrawable = com.example.apptwo/MainActivity.java
.
package com.exampleone.apptwo;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.view.Menu;
import android.widget.ImageView;
public class MainActivity extends Activity
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.acivity_main);
ImageView img = (ImageView)findViewById(R.id.swing_play);
img.setBackgroundResource(R.drawable.progress_animation);
AnimationDrawable frameAnimation = (AnimationDrawable) img.getBackground();
frameAnimation.start();
.
IDE 不会标记代码中的任何错误。但是,当我运行应用程序时,我的模拟器显示白色背景,并显示一条消息“不幸的是,AppTwo 已停止。”
ErrorLog 读取 =“未处理的事件循环异常”
LOGCAT ---------------------------------------------- -------------------------------------------------- ----------------------------------
这是会话过滤器 LOGCAT
04-06 17:10:48.193: D/AndroidRuntime(989): Shutting down VM
04-06 17:10:48.193: W/dalvikvm(989): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-06 17:10:48.213: E/AndroidRuntime(989): FATAL EXCEPTION: main
04-06 17:10:48.213: E/AndroidRuntime(989): java.lang.RuntimeException: Unable to start activity ComponentInfocom.example.apptwo/com.example.apptwo.MainActivity: java.lang.NullPointerException
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.os.Handler.dispatchMessage(Handler.java:99)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.os.Looper.loop(Looper.java:137)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-06 17:10:48.213: E/AndroidRuntime(989): at java.lang.reflect.Method.invokeNative(Native Method)
04-06 17:10:48.213: E/AndroidRuntime(989): at java.lang.reflect.Method.invoke(Method.java:511)
04-06 17:10:48.213: E/AndroidRuntime(989): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-06 17:10:48.213: E/AndroidRuntime(989): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-06 17:10:48.213: E/AndroidRuntime(989): at dalvik.system.NativeStart.main(Native Method)
04-06 17:10:48.213: E/AndroidRuntime(989): Caused by: java.lang.NullPointerException
04-06 17:10:48.213: E/AndroidRuntime(989): at com.example.apptwo.MainActivity.onCreate(MainActivity.java:14)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.Activity.performCreate(Activity.java:5104)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-06 17:10:48.213: E/AndroidRuntime(989): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-06 17:10:48.213: E/AndroidRuntime(989): ... 11 more
要发布的 LogCat(所有消息)太多,但下面的这条似乎在错误发生时很重要。
04-06 17:10:48.213: E/AndroidRuntime(989): FATAL EXCEPTION: main
.
更新到包含内容视图的 LOGCAT! ! !
: error opening trace file: No such file or directory (2)
: GC_FOR_ALLOC freed 67K, 7% free 2500K/2688K, paused 49ms, total 54ms
: I/dalvikvm-heap(1813): Grow heap (frag case) to 4.022MB for 1536016-byte allocation
: D/dalvikvm(1813): GC_FOR_ALLOC freed 2K, 5% free 3998K/4192K, paused 125ms, total 125ms
: D/dalvikvm(1813): GC_CONCURRENT freed <1K, 5% free 3998K/4192K, paused 5ms+15ms, total 105ms
: D/dalvikvm(1813): GC_FOR_ALLOC freed <1K, 5% free 3998K/4192K, paused 36ms, total 37ms
: Grow heap (frag case) to 5.485MB for 1536016-byte allocation
: GC_CONCURRENT freed <1K, 4% free 5498K/5696K, paused 75ms+14ms, total 156ms
: GC_FOR_ALLOC freed <1K, 4% free 5499K/5696K, paused 32ms, total 33ms
: Grow heap (frag case) to 6.950MB for 1536016-byte allocation
: GC_CONCURRENT freed <1K, 3% free 6999K/7200K, paused 74ms+17ms, total 156ms
: D/dalvikvm(1813): GC_FOR_ALLOC freed <1K, 3% free 6999K/7200K, paused 46ms, total 47ms
: I/dalvikvm-heap(1813): Grow heap (frag case) to 8.416MB for 1536016-byte allocation
: GC_CONCURRENT freed <1K, 3% free 8499K/8704K, paused 79ms+4ms, total 173ms
: GC_FOR_ALLOC freed <1K, 3% free 10001K/10208K, paused 33ms, total 34ms
: GC_FOR_ALLOC freed <1K, 2% free 11501K/11712K, paused 35ms, total 35ms
: GC_FOR_ALLOC freed <1K, 2% free 13002K/13216K, paused 38ms, total 38ms
: GC_FOR_ALLOC freed <1K, 2% free 14503K/14720K, paused 35ms, total 36ms
: GC_FOR_ALLOC freed <1K, 2% free 16003K/16224K, paused 39ms, total 40ms
: GC_FOR_ALLOC freed <1K, 2% free 17504K/17728K, paused 41ms, total 41ms
: GC_FOR_ALLOC freed <1K, 2% free 19004K/19232K, paused 42ms, total 43ms
: GC_FOR_ALLOC freed <1K, 2% free 20505K/20736K, paused 58ms, total 58ms
: GC_FOR_ALLOC freed <1K, 2% free 22006K/22240K, paused 137ms, total 138ms
: GC_FOR_ALLOC freed <1K, 1% free 23506K/23744K, paused 47ms, total 47ms
: GC_FOR_ALLOC freed <1K, 1% free 25007K/25248K, paused 48ms, total 48ms
: GC_FOR_ALLOC freed <1K, 1% free 26507K/26752K, paused 50ms, total 51ms
: GC_FOR_ALLOC freed <1K, 1% free 28008K/28256K, paused 56ms, total 57ms
: GC_FOR_ALLOC freed <1K, 1% free 29509K/29760K, paused 58ms, total 58ms
: Clamp target GC heap from 32.398MB to 32.000MB
: GC_FOR_ALLOC freed <1K, 1% free 31009K/31264K, paused 57ms, total 58ms
: Clamp target GC heap from 33.863MB to 32.000MB
: GC_FOR_ALLOC freed <1K, 1% free 32510K/32768K, paused 56ms, total 56ms
: Forcing collection of SoftReferences for 1536016-byte allocation
:Clamp target GC heap from 33.855MB to 32.000MB
: GC_BEFORE_OOM freed 9K, 1% free 32500K/32768K, paused 87ms, total 88ms
: Out of memory on a 1536016-byte allocation.
: "main" prio=5 tid=1 RUNNABLE
: | group="main" sCount=0 dsCount=0 obj=0x40a729a0 self=0x2a00bba8
: | sysTid=1813 nice=0 sched=0/0 cgrp=apps handle=1073849308
: | state=R schedstat=( 3245039730 1438341923 288 ) utm=275 stm=49 core=0
: at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
: at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:502)
: at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:355)
: at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:785)
: at android.content.res.Resources.loadDrawable(Resources.java:1965)
: at android.content.res.Resources.getDrawable(Resources.java:660)
: at android.graphics.drawable.AnimationDrawable.inflate(AnimationDrawable.java:282)
: at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:885)
: at android.graphics.drawable.Drawable.createFromXml(Drawable.java:822)
: at android.content.res.Resources.loadDrawable(Resources.java:1950)
: at android.content.res.Resources.getDrawable(Resources.java:660)
: at android.view.View.setBackgroundResource(View.java:14468)
: at com.example.appthree.MainActivity.onCreate(MainActivity.java:15)
: at android.app.Activity.performCreate(Activity.java:5104)
: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
: at android.app.ActivityThread.access$600(ActivityThread.java:141)
: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
: at android.os.Handler.dispatchMessage(Handler.java:99)
: at android.os.Looper.loop(Looper.java:137)
: at android.app.ActivityThread.main(ActivityThread.java:5041)
: at java.lang.reflect.Method.invokeNative(Native Method)
: at java.lang.reflect.Method.invoke(Method.java:511)
: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
: at dalvik.system.NativeStart.main(Native Method)
: --- decoder->decode returned false
: Shutting down VM
: threadid=1: thread exiting with uncaught exception (group=0x40a71930)
: FATAL EXCEPTION: main
: java.lang.OutOfMemoryError
: at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
: at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:502)
: at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:355)
: at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:785)
: at android.content.res.Resources.loadDrawable(Resources.java:1965)
: at android.content.res.Resources.getDrawable(Resources.java:660)
: at android.graphics.drawable.AnimationDrawable.inflate(AnimationDrawable.java:282)
: at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:885)
: at android.graphics.drawable.Drawable.createFromXml(Drawable.java:822)
: at android.content.res.Resources.loadDrawable(Resources.java:1950)
: at android.content.res.Resources.getDrawable(Resources.java:660)
: at android.view.View.setBackgroundResource(View.java:14468)
: at com.example.appthree.MainActivity.onCreate(MainActivity.java:15)
: at android.app.Activity.performCreate(Activity.java:5104)
: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
: at android.app.ActivityThread.access$600(ActivityThread.java:141)
: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
: at android.os.Handler.dispatchMessage(Handler.java:99)
: at android.os.Looper.loop(Looper.java:137)
: at android.app.ActivityThread.main(ActivityThread.java:5041)
: at java.lang.reflect.Method.invokeNative(Native Method)
: at java.lang.reflect.Method.invoke(Method.java:511)
: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
: at dalvik.system.NativeStart.main(Native Method)
: GC_CONCURRENT freed 30038K, 93% free 2539K/32768K, paused 73ms+97ms, total 472ms
【问题讨论】:
Android 不支持 Gif 动画 试试这个教程droid-blog.net/2011/10/14/… 它有不同的方式来显示动画 gif.. 页面底部有教程其他部分的链接.. 我建议你看看这种显示动画gif的方式droid-blog.net/2011/10/17/… 【参考方案1】:正如 Martin 所说,Android 不支持 GIF。作为一种解决方法,Android 提供Animation List/AnimationDrawable。您需要将 GIF 转换为单独的帧 [.png 文件]。我使用 GIMP 进行转换
这个 GIF 可以分解成帧:
将它们保存为 frame01.png、frame02.png 等,并创建一个动画列表 XML 文件,例如 progress_animation.xml
<animation-list android:id="@+id/selected" android:oneshot="false">
<item android:drawable="@drawable/frame01" android:duration="50" />
<item android:drawable="@drawable/frame02" android:duration="50" />
<item android:drawable="@drawable/frame03" android:duration="50" />
....
<item android:drawable="@drawable/frameN" android:duration="50" />
要开始动画,您需要将图像转换为 AnimationDrawable,并在其上调用 start()
AnimationDrawable progressAnimation = (AnimationDrawable) yourImageView.getBackground();
progressAnimation.start();
【讨论】:
感谢您提供的资源,因为它们对我帮助很大。我已经发布了我的代码更新,但是我的应用程序仍然无法运行。 您能否发布完整的 LogCat 堆栈跟踪,或者至少提及导致 UnhandledEventLoopException 的代码行? 我已经添加了会话过滤器 LogCat。我会发布所有消息(没有过滤器),但基本上有它们的页面。 哦,我应该早点发现问题 - 您应该通过调用 setContentView(R.layout.activity_main); 来设置布局 [ ] 在您尝试查找 ID 为 R.id.swing_play 的视图之前。相关的堆栈跟踪行是由以下原因引起的:java.lang.NullPointerException at com.example.apptwo.MainActivity.onCreate(MainActivity.java:14) NullPointerException 发生在 MainActivity 的第 14 行 我在 ImageView 上方调用了 setContentView。同样的事情发生在模拟器显示“不幸的是,AppTwo 已停止”的地方。我已更新代码以显示更改。【参考方案2】:当 GIF 动画作为电影播放时,Android 支持 gif 动画。
Take a look.
【讨论】:
【参考方案3】:将您的 gif 图片放入 app\src\main\assets
创建一个类似的类
public class MyGifView extends View
Movie movie;
InputStream is;
long startTime;
public MyGifView(Context context)
super(context);
try
is = getResources().getAssets().open("anim.gif");
movie = Movie.decodeStream(is);
catch (IOException e)
e.printStackTrace();
@Override
protected void onDraw(Canvas canvas)
canvas.drawColor(Color.WHITE);
super.onDraw(canvas);
long now = System.currentTimeMillis();
if (startTime == 0) // first time
startTime = now;
int relTime = (int) ((now - startTime) % movie.duration());
movie.setTime(relTime);
float scalefactorx = (float) this.getWidth() / (float) movie.width();
float scalefactory = (float) this.getHeight() / (float) movie.height();
canvas.scale(scalefactorx,1);
movie.draw(canvas, scalefactorx, scalefactory);
this.invalidate();
在您的 xml activity_layout (backgroundFrameLayout) 中的某处添加一个布局。 在您的活动 onCreate() 中的用法:
FrameLayout frameLayout = findViewById(R.id.backgroundFrameLayout);
frameLayout.addView(new MyGifView(this));
【讨论】:
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