我是
Android的新手,我在布局背景中玩动画.gif文件时遇到麻烦.当我运行应用程序时,背景是动画的.gif的单个框架,就像一张图片.我已经做了两个方面的研究：
以下链接是我得到最多帮助的地方.
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.
这是代码———————————————- ————————————————– ——————-
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()对于可见构造函数未定义
:: ERROR 3 ::缺少方法的返回类型
:: ERROR 4 ::构造函数调用必须是构造函数中的第一个语句
.
.
———-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Image View = res / layout / activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
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" >
<ImageView android:id="@+id/swing_play" android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</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不会在代码中标记任何错误.但是,当我运行应用程序时,我的模拟器显示一个白色背景,并显示一条消息“不幸的是,AppTwo已经停止了”.
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 ComponentInfo{com.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
有太多的LogCat(所有消息)要发布,但下面这一个似乎在错误的时候很重要.
04-06 17:10:48.213: E/AndroidRuntime(989): FATAL EXCEPTION: main
.
: 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,paused 5ms+15ms,total 105ms : D/dalvikvm(1813): GC_FOR_ALLOC freed <1K,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,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,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,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,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
解决方法
正如Martin所说,Android不支持GIF.作为解决方法,Android提供了
Animation List/AnimationDrawable.您将需要将GIF转换为单个帧[.png文件].我使用GIMP进行转换
这个GIF可以分解成它的框架：
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,并调用start()
AnimationDrawable progressAnimation = (AnimationDrawable) yourImageView.getBackground(); progressAnimation.start();
