为什么我的FileProvider在Android Studio中不起作用

问题描述

https://developer.android.com/training/camera/photobasics.html

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="my_images" path="Android/data/com.apsm.package.name/files/Pictures" />
</paths>

   <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="com.example.android.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths"></meta-data>
    </provider>

该清单在 content.FileProvider

implementation 'com.android.support:support-v4:26.1.0'
implementation 'com.android.support:support-compat:28.0.0'
implementation 'com.android.support:support-core-ui:28.0.0'
implementation 'com.android.support:support-core-utils:28.0.0'
implementation 'com.android.support:support-media-compat:28.0.0'
implementation 'com.android.support:support-fragment:28.0.0'

现在尝试更改清单(新清单)

Now a tried to change the Manifest for this (New Manifest)

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

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.apsm, PID: 3254
java.lang.IllegalStateException: Could not execute method for android:onClick
    at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:390)
    at android.view.View.performClick(View.java:6297)
    at android.view.View$PerformClick.run(View.java:24797)
    at android.os.Handler.handleCallback(Handler.java:790)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6626)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)
 Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Method.invoke(Native Method)
    at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385)
    at android.view.View.performClick(View.java:6297) 
    at android.view.View$PerformClick.run(View.java:24797) 
    at android.os.Handler.handleCallback(Handler.java:790) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:164) 
    at android.app.ActivityThread.main(ActivityThread.java:6626) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811) 
 Caused by: 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 androidx.core.content.FileProvider.parsePathStrategy(FileProvider.java:605)
    at androidx.core.content.FileProvider.getPathStrategy(FileProvider.java:579)
    at androidx.core.content.FileProvider.getUriForFile(FileProvider.java:417)
    at com.apsm.CadastrarNovaLocalizacao.tirarFoto(CadastrarNovaLocalizacao.java:99)
    at java.lang.reflect.Method.invoke(Native Method)
    at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:385) 
    at android.view.View.performClick(View.java:6297) 
    at android.view.View$PerformClick.run(View.java:24797) 
    at android.os.Handler.handleCallback(Handler.java:790) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:164) 
    at android.app.ActivityThread.main(ActivityThread.java:6626) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811) 

static final int REQUEST_IMAGE_CAPTURE = 1;
static final int REQUEST_TAKE_PHOTO = 1;
String currentPhotoPath;

private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "POSTO_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );

        // Save a file: path for use with ACTION_VIEW intents
        currentPhotoPath = image.getAbsolutePath();
        return image;
    }

public void tirarFoto(View v) {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Ensure that there's a camera activity to handle the intent
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        // Create the File where the photo should go
        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            // Error occurred while creating the File
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this, // ERROR HERE
                    "com.apsm.android.fileprovider",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }
}

推荐答案

您的 android:authorities 值与您提供给 FileProvider.getUriForFile()的值不匹配.

Your android:authorities value does not match what you are providing to FileProvider.getUriForFile().

• 在您的原始尝试中， com.example.android.fileprovider 与 com.apsm.android.fileprovider 不同.

第二次尝试中， $ {applicationId} .fileprovider 显然与 com.apsm.android.fileprovider 不同.

In your second attempt, ${applicationId}.fileprovider apparently is not the same as com.apsm.android.fileprovider.

通常，我们采用第二种方法(针对 android:authorities 的 $ {applicationId} .fileprovider ).为了确保您的Java代码匹配，请使用 BuildConfig.APPLICATION_ID +".fileprovider" 获得等效值，以传递给 FileProvider.getUriForFile().

Usually, we go with the second approach (${applicationId}.fileprovider for android:authorities). To ensure that your Java code matches, use BuildConfig.APPLICATION_ID + ".fileprovider" to get the equivalent value to pass to FileProvider.getUriForFile().

FWIW，此示例应用(摘自这本书)展示了如何设置 FileProvider .

FWIW, this sample app (from this book) shows how to set up FileProvider.

这篇关于为什么我的FileProvider在Android Studio中不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！