java - Android 没有此类文件或目录异常

Question

我正在尝试遵循本教程 https://developer.android.com/training/camera/photobasics.html#TaskPath用于拍摄图像并保存文件。它打开相机，我拍照，单击复选标记，然后它崩溃了。我在 StackOverflow 上找到了几篇文章，并尝试了所有我能理解的解决方案(分别是 file.mkdirs()、file.getParentFile().mkdirs() )。

看来，即使它是一个 RuntimeException，但根本问题是 IOException(我捕获并打印消息)。我正在使用 Genymotion，不确定这是否相关。我错过了什么导致我无法创建文件？

我已向我的 list 添加了权限:

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

我的按钮点击:

public void onClick(View v) {
    Log.d("DebugMySocks", "Change photo button clicked");
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    try {
        // CHANGED THIS
        mImageUri = FileProvider.getUriForFile(getApplicationContext(), getApplicationContext().getPackageName() + "socks", createImageFile());
        takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
    } catch (Exception e) {
        Log.d("DebugMySocks", "Error creating file " + e.getMessage());
    }
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

以及问题代码(我认为):

  private File createImageFile() throws IOException {
    //ADDED THIS
      int permissionCheck = ContextCompat.checkSelfPermission(this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE);
      if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    5);
      }
      // Create an image file name
      String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
      String imageFileName = "JPEG_" + timeStamp + "_";
      File storageDir = Environment.getExternalStorageDirectory();
      Log.d("DebugMySocks", "Storage directory is: " + storageDir);
      File image = new File(Environment.getExternalStorageDirectory() + File.separator + "socks"+ File.separator + imageFileName);
      Log.d("DebugMySocks", "getAbsoluteFile: " + image.getAbsoluteFile());
      image.getParentFile().mkdirs();
      image.mkdirs();
      image.createNewFile();
      //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;
  }

LogCat 的输出:

12-14 08:05:01.411 4967-4967/com.example.kevin.moresocksplease D/DebugMySocks: Change photo button clicked
12-14 08:05:01.412 4967-4967/com.example.kevin.moresocksplease D/DebugMySocks: Storage directory is: /storage/emulated/0
12-14 08:05:01.413 4967-4967/com.example.kevin.moresocksplease D/DebugMySocks: getAbsoluteFile: /storage/emulated/0/socks/JPEG_20171214_080501_
12-14 08:05:01.416 4967-4967/com.example.kevin.moresocksplease D/DebugMySocks: Error creating file No such file or directory

异常(exception)情况:

FATAL EXCEPTION: main
Process: com.example.kevin.moresocksplease, PID: 4967
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=111, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.example.kevin.moresocksplease/com.example.kevin.moresocksplease.EditProfileActivity}: java.lang.NullPointerException: uri
 at android.app.ActivityThread.deliverResults(ActivityThread.java:4089)
 at android.app.ActivityThread.handleSendResult(ActivityThread.java:4132)
 at android.app.ActivityThread.-wrap20(ActivityThread.java)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1533)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:154)
 at android.app.ActivityThread.main(ActivityThread.java:6119)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.NullPointerException: uri
 at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:111)
 at android.content.ContentResolver.notifyChange(ContentResolver.java:1714)
 at android.content.ContentResolver.notifyChange(ContentResolver.java:1693)
 at com.example.kevin.moresocksplease.EditProfileActivity.onActivityResult(EditProfileActivity.java:254)
 at android.app.Activity.dispatchActivityResult(Activity.java:6932)
 at android.app.ActivityThread.deliverResults(ActivityThread.java:4085)
 at android.app.ActivityThread.handleSendResult(ActivityThread.java:4132) 
 at android.app.ActivityThread.-wrap20(ActivityThread.java) 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1533) 
 at android.os.Handler.dispatchMessage(Handler.java:102) 
 at android.os.Looper.loop(Looper.java:154) 
 at android.app.ActivityThread.main(ActivityThread.java:6119) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

最后，包括因为它位于异常堆栈中:

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d("DebugMySocks", "onActivityResult in EditProfileActivity");
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == this.RESULT_OK) {
        this.getContentResolver().notifyChange(mImageUri, null); // <-- THIS IS LINE 254!
        ContentResolver cr = this.getContentResolver();
        Bitmap bitmap;
        try
        {
            bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, mImageUri);
            mProfileImage.setImageBitmap(bitmap);
            saveToFirebase(bitmap);
        }
        catch (Exception e)
        {
            Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT).show();
            Log.d("DebugMySocks", "Failed to load", e);
        }
    }
}

我从中获取信息的其他链接:

File.createNewFile() thowing IOException No such file or directory

Android Camera Intent: how to get full sized photo?

编辑1:

查看此内容后，我将日志添加到 mkdir 请求中，它们都返回 false。根据这位先生的说法，这意味着目录已经存在，所以只是文件的创建失败了？ Creating a directory in /sdcard fails

Log.d("DebugMySocks", "parentfile mkdirs: " + image.getParentFile().mkdirs());
Log.d("DebugMySocks", "image.mkdirs: " + image.mkdirs());
Log.d("DebugMySocks", "create file: " + image.createNewFile());

DebugMySocks: parentfile mkdirs: false
DebugMySocks: image.mkdirs: false
DebugMySocks: Error creating file No such file or directory

编辑2:我现在有:

public void onClick(View v) {
                        Log.d("DebugMySocks", "Change photo button clicked");
                        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                        try {
                            if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)== PackageManager.PERMISSION_GRANTED) {
                                mImageUri = FileProvider.getUriForFile(getApplicationContext(), getApplicationContext().getPackageName() + "socks", createImageFile());
                            } else {
                                Log.v("DebugMySocks","Permission is revoked");
                                ActivityCompat.requestPermissions(getParent(), new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
                            }
                            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
                        } catch (Exception e) {
                            Log.d("DebugMySocks", "Error creating file " + e.getMessage());
                        }
                        if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                            startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
                        }
                    }

    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case 0:
                boolean permissionsGranted = true;
                if (grantResults.length > 0 && permissions.length==grantResults.length) {
                    for (int i = 0; i < permissions.length; i++){
                        if (grantResults[i] != PackageManager.PERMISSION_GRANTED){
                            permissionsGranted=false;
                        }
                    }

                } else {
                    permissionsGranted=false;
                }
                if(permissionsGranted){
                    try {
                        mImageUri = FileProvider.getUriForFile(getApplicationContext(), getApplicationContext().getPackageName() + "socks", createImageFile());
                    } catch (Exception e) {
                        Log.d("DebugMySocks", "Permissions granted but exception happened " + e.getMessage());
                    }
                }
                break;
        }
    }

但是我得到创建文件时出错尝试调用虚拟方法'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)'在空对象引用上

Answer 1

您需要检查用户是否授予了权限。

private void checkPermission(){
    if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)== PackageManager.PERMISSION_GRANTED) {        
        createFile();
    } else {    
        Log.v(TAG,"Permission is revoked");
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);  
    }
}


@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case 0:
            boolean permissionsGranted = true;
            if (grantResults.length > 0 && permissions.length==grantResults.length) {
                for (int i = 0; i < permissions.length; i++){
                    if (grantResults[i] != PackageManager.PERMISSION_GRANTED){
                        permissionsGranted=false;
                    }
                }

            } else {
                permissionsGranted=false;
            }
            if(permissionsGranted){
                createFile();
            }
            break;
    }
}

private void createFile(){
   ContentResolver cr = this.getContentResolver();
   Bitmap bitmap;
   try{
       bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, mImageUri);
       mProfileImage.setImageBitmap(bitmap);
       saveToFirebase(bitmap);
   }catch (Exception e){
     Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT).show();
     Log.d("DebugMySocks", "Failed to load", e);
   }
}

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d("DebugMySocks", "onActivityResult in EditProfileActivity");
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == this.RESULT_OK) {
        this.getContentResolver().notifyChange(mImageUri, null); // <-- THIS IS LINE 254!
        checkPermission();
    }
}