为什么不使用相机意图拍摄的图像保存到我的手机？

Question

编辑

我的函数现在看起来像这样：

p

Answer 1

如果您想将图像保存在外部存储中，请使用 Externalstoragepublicdirectory 函数。

Answer 2

此意图需要 Uri 格式的 EXTRA_OUTPUT 位置，请参阅https://developer.android.com/reference/android/provider/MediaStore.html#ACTION_IMAGE_CAPTURE。某些设备可能会理解绝对文件路径，但这不是记录在案的行为。

您可以使用getExternalMediaDirs() 来避免许多权限限制。

Answer 3

我对你的代码做了一些修改：

将此添加到您的清单中的应用程序级别：

<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" />
    </provider>

然后创建file_paths.xml文件：

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-cache-path name="my_cache" path="." />
    <external-path name="my_images" path="Pictures/" />
     </paths>

然后在你的代码中：

  private static final String FILE_PROVIDER_AUTHORITY = "com.example.android.fileprovider";

  private String mTempPhotoPath;

 public void takePhoto() {
// Create the capture image intent
    Intent imageCapture= new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    // Ensure that there's a camera activity to handle the intent
    if (imageCapture.resolveActivity(getPackageManager()) != null) {
        // Create the temporary File where the photo should go
        File photoFile = null;
        try {
            photoFile = createTempImageFile(this);
        } catch (IOException ex) {
            // Error occurred while creating the File
            ex.printStackTrace();
        }
        // Continue only if the File was successfully created
        if (photoFile != null) {

            // Get the path of the temporary file
            mTempPhotoPath = photoFile.getAbsolutePath();

            // Get the content URI for the image file
            Uri imageUri = FileProvider.getUriForFile(this,
                    FILE_PROVIDER_AUTHORITY,
                    photoFile);

            // Add the URI so the camera can store the image
            imageCapture.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    }

    static File createTempImageFile(Context context) throws IOException {
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = context.getExternalCacheDir();

    return File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );
}


//To save image

String mCurrentPhotoPath = null;
private File createImageFile() throws IOException {

    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "IMG_" + timeStamp + "_";
    File storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "/DCIM/Camera");
    Log.d(TAG, "createImageFile: Saving image to:" + storageDir);
    File image = new File(storageDir, imageFileName);

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

    //Return the saved image
    return mCurrentPhotoPath ;
}