Question

我一直在研究一个简单的Android应用程序，它可以拍照并将其存储在应用程序的目录中。我完全按照Android Developpers教程进行了操作，但我仍然遇到错误。

我在StackOverflow中看到很多关于此错误的问题，但没有人看到修复我的错误。

这是我得到的logcat错误：

    FATAL EXCEPTION: main
Process: com.example.victormaruca.gpstesting, PID: 31539
java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/Android/data/com.example.victormaruca.gpstesting/files/Pictures/JPEG_20170914_014854_-551864997.jpg
at android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:712)
at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:401)
at com.example.victormaruca.gpstesting.MainActivity.dispatchTakePictureIntent(MainActivity.java:124)
at com.example.victormaruca.gpstesting.MainActivity.access$000(MainActivity.java:43)
at com.example.victormaruca.gpstesting.MainActivity$3.onClick(MainActivity.java:81)
at android.view.View.performClick(View.java:5201)
at android.view.View$PerformClick.run(View.java:21163)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

这是我调用getUriForFile的方法：

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {

        File photoFile = null;
        try {
            photoFile = createImageFile();
        } catch (IOException ex) {
            Log.e("Erro", "no ceateImageFile() : "+ex);
        }

        if (photoFile != null) {
            Uri photoURI = FileProvider.getUriForFile(this,
                    "com.example.victormaruca.gpstesting.fileprovider",
                    photoFile);
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
            startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
        }
    }
}

这是我创建文件的方法：

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + 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
    mCurrentPhotoPath = image.getAbsolutePath();
    return image;
}

AndroidManifest.xml片段：

<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>

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

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />


<uses-feature   android:name="android.hardware.camera"
                android:required="true" />

file_paths.xml：

  <?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.example.victormaruca.gpstesting/files/Pictures/" />
    </paths>

任何帮助都会被贬低！

Answer 1

解决方案

将您的 file_paths.xml 更改为

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

其他内容

我想您关注官方文章to take photos on Android的情况。此处的示例 res / xml / file_paths.xml 令人困惑。福克斯的例子：

<!-- Not working. According to the docs. -->
<external-files-path 
    name="my_images"
    path="Android/data/com.example.package.name/files/Pictures" />

<!-- Works -->
<external-files-path
    name="my_images"
    path="Pictures" />

<!-- Also works -->
<external-files
    name="my_images"
    path="Android/data/com.example.package.name/files/Pictures" />

我找到了解决方法here in the video。

另外，看看该方法的源代码您使用的 FileProvider $ SimplePathStrategy.getUriForFile 。在调试源代码时，您可以看到它如何构建Uri以及为什么它可能引发IllegalArgumentException。它也可以导致解决方案。

源代码：

        ...
        // Find the most-specific root path
        Map.Entry<String, File> mostSpecific = null;
        for (Map.Entry<String, File> root : mRoots.entrySet()) {
            final String rootPath = root.getValue().getPath();
            if (path.startsWith(rootPath) && (mostSpecific == null
                    || rootPath.length() > mostSpecific.getValue().getPath().length())) {
                mostSpecific = root;
            }
        }

        if (mostSpecific == null) {
            throw new IllegalArgumentException(
                    "Failed to find configured root that contains " + path);
        }
        ...

方法getUriForFile出错 - java.lang.IllegalArgumentException：无法找到包含/ storage / emulated / 0 / Android / data /的已配置根目录

1 个答案: