安卓7.0以上版本更新apk报错

由于项目需求，项目组的老代码需要推翻重写，现以7.0系统基础上，安装apk时崩溃了，异常：

FATAL EXCEPTION: main
Process: com.hx.newzszz302, PID: 27179
android.os.FileUriExposedException: file:///storage/emulated/0/ZSDX203/download/2.0.1zsdx.apk exposed beyond app through Intent.getData()
at android.os.StrictMode.onFileUriExposed(StrictMode.java:1816)
at android.net.Uri.checkFileUriExposed(Uri.java:2350)
at android.content.Intent.prepareToLeaveProcess(Intent.java:9076)
at android.content.Intent.prepareToLeaveProcess(Intent.java:9037)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1530)
at android.app.ContextImpl.startActivity(ContextImpl.java:881)
at android.app.ContextImpl.startActivity(ContextImpl.java:851)
at android.content.ContextWrapper.startActivity(ContextWrapper.java:356)
at com.hx.newzszz.common.utils.FileUtils.installApk(FileUtils.java:106)
at com.hx.newzszz.splash.SplashPresenter.updateApk(SplashPresenter.java:167)
at com.hx.newzszz.splash.SplashActivity$2.update(SplashActivity.java:122)
at com.hx.newzszz.common.widget.UpdateApkDialog.onClick(UpdateApkDialog.java:92)
at android.view.View.performClick(View.java:5646)
at android.view.View$PerformClick.run(View.java:22450)
at android.os.Handler.handleCallback(Handler.java:755)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6524)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:941)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:831)

这就十分蛋疼了，运行了一下老代码，发现并没有报错，照样跑，于是百度发现，原来是7.0作祟。

查看了几位大神的博客，发现解决方法如下：

1、在AndroidManifest.xml中添加provider

<providerandroid:name="android.support.v4.content.FileProvider"android:authorities="com.hx.newzszz.fileProvider"android:grantUriPermissions="true"android:exported="false"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/file_paths" /></provider>

2、根据AndroidManifest.xml中添加的provider创建资源文件

内容：

<?xml version="1.0" encoding="utf-8"?>
<paths><external-pathname="files_root"path="Android/data/com.hx.newzszz/" />//此处填写包名<external-pathname="external_storage_root"path="." />
</paths>

3、安装代码：

  /*** 安装Apk** @param apkFile*/public static void installApk(File apkFile) {Intent intent = new Intent(Intent.ACTION_VIEW);//判断是否是AndroidN以及更高的版本if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);Uri contentUri = FileProvider.getUriForFile(ZszzApplication.getInstance(),BuildConfig.APPLICATION_ID + ".fileProvider", apkFile);intent.setDataAndType(contentUri, "application/vnd.android.package-archive");} else {intent.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);}ZszzApplication.getInstance().startActivity(intent);}

另外：！！经过改动后，终于以为可以跑了，结果又报错了，这个错误最坑：

这是因为步骤3中红色部位

".fileProvider"

和步骤1中的

android:authorities="com.hx.newzszz.fileProvider"的

.fileprovider"

不一致，这就导致后面调用

final ProviderInfo info = context.getPackageManager().resolveContentProvider(authority, PackageManager.GET_META_DATA);
final XmlResourceParser in = info.loadXmlMetaData(context.getPackageManager(), META_DATA_FILE_PROVIDER_PATHS);

方法时会空指针

E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.hx.newzszz, PID: 26387java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.PackageItemInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object referenceat android.support.v4.content.FileProvider.parsePathStrategy(FileProvider.java:583)at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:557)at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:399)at com.hx.newzszz.common.utils.FileUtils.installApk(FileUtils.java:102)at com.hx.newzszz.splash.SplashPresenter.updateApk(SplashPresenter.java:167)at com.hx.newzszz.splash.SplashActivity$2.update(SplashActivity.java:122)at com.hx.newzszz.common.widget.UpdateApkDialog.onClick(UpdateApkDialog.java:92)at android.view.View.performClick(View.java:5646)at android.view.View$PerformClick.run(View.java:22450)at android.os.Handler.handleCallback(Handler.java:755)at android.os.Handler.dispatchMessage(Handler.java:95)at android.os.Looper.loop(Looper.java:156)at android.app.ActivityThread.main(ActivityThread.java:6524)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:941)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:831)

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