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<h1 class="post-title">MultidexApplication相关的一个crash</h1>
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<!-- <a href='/'>Tao He</a> -->
<time class="post-date" datetime="2018-11-26">26 Nov 2018</time>
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<p>最近在内测的一个App在内测开始后有用户反馈启动就crash的问题，后来拿到用户的信息后发现几个crash的机器都是4.4的机器，因为现在真实用户使用4.4系统的用户真的是不多了，就没怎么在意，但是在阿里云移动测试平台进行兼容性测试的时候，这个问题必现，并且都出现在4.4的机器上，查看兼容性测试报告，都是同一个crash，崩溃的堆栈记录了下来:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>FATAL EXCEPTION: main Process: com.ross.android, PID: 9282 java.lang.RuntimeException: Unable to get provider com.readystatesoftware.chuck.internal.data.ChuckContentProvider:
java.lang.ClassNotFoundException: Didn't find class "com.readystatesoftware.chuck.internal.data.ChuckContentProvider" on path: DexPathList[[zip file "/data/app/com.ross.android-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.ross.android-1, /vendor/lib, /system/lib]]
at android.app.ActivityThread.installProvider(ActivityThread.java:5060)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:4631)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4571)
at android.app.ActivityThread.access$1500(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1406)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5341)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassNotFoundException: Didn't find class "com.readystatesoftware.chuck.internal.data.ChuckContentProvider" on path: DexPathList[[zip file "/data/app/com.ross.android-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.ross.android-1, /vendor/lib, /system/lib]] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
at android.app.ActivityThread.installProvider(ActivityThread.java:5045)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:4631)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4571)
at android.app.ActivityThread.access$1500(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1406)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5341)
at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
at dalvik.system.NativeStart.main(Native Method)
</code></pre></div></div>
<p>看到这个崩溃的记录后，赶紧去查看到了build.gradle中multiDexEnabled选项，果然是true，处于打开状态，然后看了本App的Application竟然并没有继承自<code class="language-plaintext highlighter-rouge">MultiDexApplication</code>，在<code class="language-plaintext highlighter-rouge">Application</code>的onCreate的方法中也没有调用<code class="language-plaintext highlighter-rouge">MultiDex.install(this)</code>, 这也就难怪在4.4中出现这个崩溃了，因为貌似这个崩溃只出现在 api<21 的情况下, 因为我平时的开发机都是8.0的系统，所以这个问题一直没有暴露出来, 直到将这个App安装在用户的机器上，崩溃出现了，这个问题解决起来其实很简单，要么将本App的Application继承自<code class="language-plaintext highlighter-rouge">MultiDexApplication</code>, 要么在Application中的onCreate中调用<code class="language-plaintext highlighter-rouge">MultiDex.install(this)</code>。就是这么简单,那这么简单的一个问题为什么要专写一篇来记录呢？其实也是因为这次这个内测阶段的crash的问题很典型，它就是在开发工程中被忽略，或者现有环境没有覆盖到，导致崩溃出现在了用户的机器上，其实这类问题是可以在发布版本前就能避免的，算是一次很好的教训。 解决方案再明确下:</p>
<ul>
<li>方法一</li>
</ul>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>TestApplcation extends MultiDexApplication {
}
</code></pre></div></div>
<ul>
<li>方法二</li>
</ul>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>TestApplcation extends Application {
@Override
public void onCreate() {
super.onCreate();
MultiDex.install(this);
}
}
</code></pre></div></div>
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<p>今天PM提了一个视频开屏页的需求，需要在用户第一次使用时播放一个开屏视频，乍一看，挺简单一需求，但是也或多或少碰到了一些坑，也发现了Android资源编译的一个问题，本着研发之事无小事的原则，还是要记录下踩坑经验和发现的问题。整个实现过程一共两三个小时，逐步解决了以下问题: #### 视频全屏 看到这个问题的第一反应就是把`VideoView` 的宽高设置为`match_parent`, 并且保证父容器也是`match_parent` 根布局, 但是事实没那么简单，视频播放后并没有完全全屏，在我的开发机上视频底部有一条细细的白边，很明显视频没有完全全屏。后来又想到设置`MediaPlayer`的视频缩放模式: ``` mPlayer.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING); ``` 设置了两种模式以后都没有效果，这说明`VideoView`本身没有全屏，没有铺满整个屏幕，所以需要根据屏幕大小动态设置`VideoView`的尺寸，所以用自定义View实现。 自定义一个继承自`VideoView`的类来满足要求，具体实现如下: ``` public...</p>
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<p>在日常的Java开发中使用enum是很稀松平常的事，但是在Android应用的开发中使用enum时事情就没那么简单了。以下是Google官方给出的建议: “Enums often require more than twice as much memory as static constants. You should...</p>
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