如何解决这个问题安卓错误？？(java.lang.NullPointerException： Try to invoke virtual Method 'android.content.res.Xm

Question

当我执行我的应用程序时，安卓工作室 LOGCAT 中会出现以下错误。 如何解决这个问题？

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
at android.support.v4.content.FileProvider.parsePathStrategy(FileProvider.java:605)
at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:579)
at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:417)
at com.google.zxing.client.android.CaptureActivity$18.onClick(CaptureActivity.java:1527)
at android.view.View.performClick(View.java:6891)
at android.widget.TextView.performClick(TextView.java:12651)
at android.view.View$PerformClick.run(View.java:26083)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6938)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

我在下面添加了AndroidManifest.xml

<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>

我添加了privider_paths文件。

<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="external_files"
path="." />
<root-path
name="external_files"
path="/storage/"/>
</paths>

和错误发生这一点

cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, FileProvider.getUriForFile(getApplicationContext(), BuildConfig.APPLICATION_ID+".FileProvider", file));

Answer 1

在你的application标签中试试这个

<application
android:requestLegacyExternalStorage="true">
</application>