java.lang.IllegalArgumentExcture：未能找到配置的根包含 /storage/emulated/0/Android/data/

Question

构建基本的应用程序，并获得IllegalArgument异常：有一个按钮启动相机应用程序，我试图将图像保存到图片。

发现一些类似问题，但无法解决我的问题：

• Android:FileProvider IllegalArgumentException未能找到包含/data/data/**/files/Videos/final的已配置根目录。mp4
• FileProvider“找不到配置的根目录”异常

下面是我的代码。有人能帮助我所失去的吗？

public class CatalogDataActivity extends AppCompatActivity {

    static final int REQUEST_IMAGE_CAPTURE = 1;
    public String path= Environment.getExternalStorageDirectory().getAbsolutePath()+"/CatalogData";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        //verifyStoragePermissions();
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_catalog_data);
        final Button btCamera=(Button)findViewById(R.id.btn_camera);
        final Button btSave=(Button)findViewById(R.id.btn_save);

        final EditText etProductName=(EditText)findViewById(R.id.et_productName);
        final EditText etProductDescription=(EditText)findViewById(R.id.et_description);
        final TextView finalText=(TextView)findViewById(R.id.tv_saved_text);
        File dir=new File(path);
        if(!dir.isDirectory()){
            dir.mkdir();
        }
        btCamera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               /* Intent takePictureIntent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if(takePictureIntent.resolveActivity(getPackageManager())!=null){
                    startActivityForResult(takePictureIntent,REQUEST_IMAGE_CAPTURE);
                }*/
                dispatchTakePictureIntent();
            }
        });
        btSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String newProductDataStr=etProductName.getText()+","+etProductDescription.getText()+"|";
                File file=new File(path+"/catalogdata.txt");
                System.out.println("Path:"+path);
                writeToFile(newProductDataStr,getApplicationContext());
                String data=readFromFile(getApplicationContext());
                finalText.setText(data);
                //finalText.
                String []splitData=data.split("|");

                //System.out.println(">>>>>>>>>>>>>>>>>>>>////"+splitData.length+"/////>>>>>>>>>>>>>>>>>>"+splitData[splitData.length-4]);
            }
        });

    }

    private void writeToFile(String data,Context context) {
        try {
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput("config1.txt", Context.MODE_APPEND));
            outputStreamWriter.write(data);
            outputStreamWriter.close();
        }
        catch (IOException e) {
            System.out.println("Exception"+ "File write failed: " + e.toString());
        }
    }

    private String readFromFile(Context context) {

        String ret = "";

        try {
            InputStream inputStream = context.openFileInput("config1.txt");

            if ( inputStream != null ) {
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                String receiveString = "";
                StringBuilder stringBuilder = new StringBuilder();

                while ( (receiveString = bufferedReader.readLine()) != null ) {
                    stringBuilder.append(receiveString);
                }

                inputStream.close();
                ret = stringBuilder.toString();
            }
        }
        catch (FileNotFoundException e) {
            Log.e("login activity", "File not found: " + e.toString());
        } catch (IOException e) {
            Log.e("login activity", "Can not read file: " + e.toString());
        }

        return ret;
    }

    @Override
    public void onActivityResult(int requestCode,int resultCode,Intent data){
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            Bundle extras = data.getExtras();
            Bitmap bitMap = (Bitmap) extras.get("data");
            String ImagePath = MediaStore.Images.Media.insertImage(
                    getContentResolver(),
                    bitMap,
                    "demo_image",
                    "demo_image"
            );
            System.out.println("Saved Image in :"+ImagePath);
        }
    }

    String mCurrentPhotoPath;

    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);
        if(!storageDir.isDirectory()){
            storageDir.mkdir();
        }
        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;
    }
    static final int REQUEST_TAKE_PHOTO = 1;

    private void dispatchTakePictureIntent() {
        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) {
                ex.printStackTrace();

            }
            // Continue only if the File was successfully created
            if (photoFile != null) {
                try {
                    Uri photoURI = FileProvider.getUriForFile(this,
                            "com.example.android.fileprovider",
                            photoFile);
                    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                    startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
                }catch(Exception e){
                    e.printStackTrace();
                }
            }
            //galleryAddPic();
        }
    }
    private void galleryAddPic() {
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        File f = new File(mCurrentPhotoPath);
        Uri contentUri = Uri.fromFile(f);
        mediaScanIntent.setData(contentUri);
        this.sendBroadcast(mediaScanIntent);
    }

}

显示xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidapp.natty.catalogcreate">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".CatalogDataActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-feature android:name="android.hardware.camera"
        android:required="true" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        android:maxSdkVersion="18" />
    <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>
</manifest>

file_paths.xml放置在res/xml/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="com.androidapp.natty.catalogcreate/files/Pictures" />
</paths>    

活动\目录\数据。xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_catalog_data"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.androidapp.natty.catalogcreate.CatalogDataActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:id="@+id/textView" />

    <Button
        android:text="Open Camera"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView"
        android:layout_marginTop="10dp"
        android:id="@+id/btn_camera"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:elevation="0dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:text="Product Name"
        android:ems="10"
        android:layout_below="@+id/btn_camera"
        android:layout_marginTop="50dp"
        android:id="@+id/et_productName"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textMultiLine"
        android:ems="10"
        android:id="@+id/et_description"
        android:text="Enter Description"
        android:layout_below="@+id/et_productName"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@android:drawable/ic_menu_add"
        android:layout_marginTop="28dp"
        android:id="@+id/iv_image1"
        android:layout_below="@+id/et_description" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@android:drawable/ic_menu_add"
        android:layout_alignTop="@+id/iv_image1"
        android:layout_toRightOf="@+id/textView"
        android:layout_toEndOf="@+id/textView"
        android:id="@+id/iv_image2" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@android:drawable/ic_menu_add"
        android:layout_marginLeft="41dp"
        android:layout_marginStart="41dp"
        android:id="@+id/iv_image3"
        android:layout_alignTop="@+id/iv_image2"
        android:layout_toRightOf="@+id/iv_image2"
        android:layout_toEndOf="@+id/iv_image2" />

    <Button
        android:text="Save Product"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/iv_image2"
        android:layout_marginTop="18dp"
        android:id="@+id/btn_save"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn_save"
        android:layout_marginTop="56dp"
        android:text="Hello World!"
        android:id="@+id/tv_saved_text" />

</RelativeLayout>

> W/System.err: java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/Android/data/com.androidapp.natty.catalogcreate/files/Pictures/JPEG_20170222_233359_1077283085.jpg
W/System.err:     at android.support.v4.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:711)
W/System.err:     at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:400)
W/System.err:     at com.androidapp.natty.catalogcreate.CatalogDataActivity.dispatchTakePictureIntent(CatalogDataActivity.java:176)
W/System.err:     at com.androidapp.natty.catalogcreate.CatalogDataActivity.access$000(CatalogDataActivity.java:33)
W/System.err:     at com.androidapp.natty.catalogcreate.CatalogDataActivity$1.onClick(CatalogDataActivity.java:61)
W/System.err:     at android.view.View.performClick(View.java:5612)
W/System.err:     at android.view.View$PerformClick.run(View.java:22285)
W/System.err:     at android.os.Handler.handleCallback(Handler.java:751)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
W/System.err:     at android.os.Looper.loop(Looper.java:154)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6123)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
I/Choreographer: Skipped 2537 frames!  The application may be doing too much work on its main thread.
I/art: Do full code cache collection, code=101KB, data=124KB
I/art: After code cache collection, code=64KB, data=67KB

Answer 1

在清单中使用文件提供程序

并声明提供程序路径，如下所述

    <external-path path="." name="external_storage_root" />

它将解决这个问题

Answer 2

我认为这些是正确的方式

<?xml version="1.0" encoding="utf-8"?>
<paths>
  <external-path
    name="external"
    path="." />
  <external-files-path
    name="external_files"
    path="." />
  <cache-path
    name="cache"
    path="." />
  <external-cache-path
    name="external_cache"
    path="." />
<files-path
    name="files"
    path="." />
</paths>

Answer 3

您不能直接访问根目录/存储/模拟/0/（外部路径）中的com.androidapp.natty.catalogcreate/file/Pictures目录。您需要指定它的完整路径，即'Android/data/com.androidapp.natty. catalog创作/文件/图片'。

您还可以使用外部文件路径（对应于/storage/emulated/0/com.androidapp.natty.catalogcreate/files/目录），然后指定其图片目录。代码如下所示：

<?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.androidapp.natty.catalogcreate/files/Pictures" />
    </paths>

或：

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

或：

    <?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>