插件里ContentProvider不能使用

[kkmike999]

目录结构

• app
• app.main
• app.main2

app.main2配置了ContentProvider

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.mysmall.app.main2">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="AppMain2"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity2">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <provider
            android:name=".BeanProvider"
            android:exported="true"
            android:authorities="com.example.mysmall.app.main2.BeanProvider"/>

        <activity android:name=".ActivityC">
        </activity>
    </application>

</manifest>

在app.main2的MainActivity2获取不到ContentProvider

package com.example.mysmall.app.main2;

public class MainActivity2 extends AppCompatActivity {
    private static final String AUTHORITY = "com.example.mysmall.app.main2.BeanProvider";

    @Override
    protected void onCreate(Bundle savedInstanceState) { ... }

    public void onProviderClick(View view) {
        ContentProviderClient client  = getContentResolver().acquireContentProviderClient(AUTHORITY);
        ContentProvider       provider = client.getLocalContentProvider();

        // provider == null

    }
}

我本来想在app.main和宿主获取app.main2配置的ContentProvider的，用于解决插件间通讯问题。不知道以后Small能不能支持？

@galenlin

[galenlin]

目前插件manifest只支持注册Activity，其他系统组件需要在宿主进行注册。

[kkmike999]

@galenlin 那以后有没计划支持插件里注册content provider？

[galenlin]

不会做到Small核心库里。后期可能考虑以某种方式向外导接口给用户自己扩展。

[kkmike999]

@galenlin 因为android studio可以在依赖的module声明provider的，Small不可以的话，有点奇怪。或者在bundle.json 里配置也可以

[galenlin]

@kkmike999 现在的问题是运行时的处理，动态注册Provider需要增加一系列的hook操作。会带来一些成本，根据二八原则，框架应该集中精力满足80%的需求，并做到极致。

所以目前我的建议是在宿主的manifest去注册你的Provider就可以了，代码实现可以放到插件里。

[kkmike999]

@galenlin 请问在宿主如何注册插件的Provider？因为Provider代码写在插件，所以app/AndroidManifest.xml不能引用插件Provider.

<provider
            android:name="com.small.provider.app.main.AppMainProvider"
            android:authorities="com.small.provider.app.main.AppMainProvider"/>

运行时报错：

 Process: com.small.provider, PID: 29125
 java.lang.RuntimeException: Unable to get provider com.small.provider.app.main.AppMainProvider: java.lang.ClassNotFoundException: Didn't find class "com.small.provider.app.main.AppMainProvider" on path: DexPathList[[zip file "/data/app/com.small.provider-1/base.apk"],nativeLibraryDirectories=[/data/app/com.small.provider-1/lib/arm, /vendor/lib, /system/lib]]
     at android.app.ActivityThread.installProvider(ActivityThread.java:5037)
     at android.app.ActivityThread.installContentProviders(ActivityThread.java:4629)
     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4569)
     at android.app.ActivityThread.access$1500(ActivityThread.java:154)
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380)
     at android.os.Handler.dispatchMessage(Handler.java:102)
     at android.os.Looper.loop(Looper.java:135)
     at android.app.ActivityThread.main(ActivityThread.java:5298)
     at java.lang.reflect.Method.invoke(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:372)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:910)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:705)

  Caused by: java.lang.ClassNotFoundException: Didn't find class "com.small.provider.app.main.AppMainProvider" on path: DexPathList[[zip file "/data/app/com.small.provider-1/base.apk"],nativeLibraryDirectories=[/data/app/com.small.provider-1/lib/arm, /vendor/lib, /system/lib]]
     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
     at android.app.ActivityThread.installProvider(ActivityThread.java:5022)
     at android.app.ActivityThread.installContentProviders(ActivityThread.java:4629) 
     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4569) 
     at android.app.ActivityThread.access$1500(ActivityThread.java:154) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:135) 
     at android.app.ActivityThread.main(ActivityThread.java:5298) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:910) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:705) 

    Suppressed: java.lang.ClassNotFoundException: com.small.provider.app.main.AppMainProvider
     at java.lang.Class.classForName(Native Method)
     at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
     at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
            ... 13 more
  Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

[galenlin]

从你的log来看，插件没有被加载：

Didn't find class "com.small.provider.app.main.AppMainProvider" on path: DexPathList[[zip file "/data/app/com.small.provider-1/base.apk"], ...

如果有插件，这里的DexPathList不只一个的。

[kkmike999]

@galenlin 我在SmappApp的onCreate()时才Small.setUp，AndroidManifest.xml应该在onCreate前就被解析（仅仅猜测），所以在AndroidManifest.xml声明provider就会报这错。

不过我找到了动态加载Provider的方法：

public void onBtnAppMainProviderClick(View view) throws ClassNotFoundException {
        Class clazz = Class.forName("com.small.provider.app.main.AppMainProvider");

        ProviderInfo info = new ProviderInfo();
        info.authority = clazz.getName();
        info.applicationInfo = applicationInfo;
        info.processName = "com.small.provider";
        info.name = clazz.getName();
        info.packageName = clazz.getPackage().getName();
        info.enabled = true;

        installProvider(this, Arrays.asList(info));
}

protected void installProvider(Context context, ProviderInfo providerInfo) {
        try {
            Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");

            Method currentActivityThreadMethod = activityThreadClass.getDeclaredMethod("currentActivityThread");
            Object currentActivityThread       = currentActivityThreadMethod.invoke(null);
            Method installProvidersMethod      = activityThreadClass.getDeclaredMethod("installContentProviders", Context.class, List.class);
            installProvidersMethod.setAccessible(true);
            installProvidersMethod.invoke(currentActivityThread, context, infos);
        } catch (Exception e) {
            e.printStackTrace();
        }
}

我觉得Small应该提供动态注册provider方法，只要提供provider packageName+className。