前言
今天学习ContentProvider,写Demo的测试时候,即:一个app(应用 A) 获取另一个app(应用B)的ContentProvide中提供的数据时,闪退,错误信息如下:
Caused by: java.lang.SecurityException: Permission Denial: opening provider com.ang.providertest.BookProvider from ProcessRecord{26ea4fd8 21726:com.ang.demo/u0a129} (pid=21726, uid=10129) requires com.ang.PROVIDER_PERMISSION or com.ang.PROVIDER_PERMISSION
at android.os.Parcel.readException(Parcel.java:1465)
at android.os.Parcel.readException(Parcel.java:1419)
at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:2848)
at android.app.ActivityThread.acquireProvider(ActivityThread.java:4439)
at android.app.ContextImpl$ApplicationContentResolver.acquireProvider(ContextImpl.java:2199)
at android.content.ContentResolver.acquireProvider(ContentResolver.java:1378)
at android.content.ContentResolver.insert(ContentResolver.java:1184)
at com.ang.chapter_2.provider.ProviderActivity.onCreate(ProviderActivity.java:34)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2188)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2273)
at android.app.ActivityThread.access$800(ActivityThread.java:138)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1236)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5045)
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:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)
at dalvik.system.NativeStart.main(Native Method)
错误原因:
报错app没有权限访问另一个app中的ContentProvider提供的数据
解决办法:
1,需要在应用B的清单文件(AndroidManifest)中的provider添加 android:exported="true" 属性;如果还未解决请看2
<provider
android:name=".BookProvider"
android:authorities="com.ang.providertest"
android:permission="com.ang.PROVIDER_PERMISSION"
android:exported="true" />
2,如果应用B的清单文中注册的provider中有android:permission属性,检查此权限在应用B中否声明过。声明过后,需要在获取此ContentProvider数据的app(应用A)中也要声明此权限<uses-permission android:name="com.ang.PROVIDER_PERMISSION" /> ;这里涉及到的其实是自定义权限的问题
注意:应用A和应用B中的权限声明是有的区别;如下是应用B的清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ang.providertest">
//声明权限
<permission android:name="com.ang.PROVIDER_PERMISSION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--android:permission="com.ang.PROVIDER_PERMISSION"-->
<provider
android:name=".BookProvider"
android:authorities="com.ang.providertest"
android:permission="com.ang.PROVIDER_PERMISSION"
android:exported="true" />
</application>
</manifest>