Android 相机意图：如何获取全尺寸照片？

问题描述 投票：0回答：8

我正在使用意图来启动相机：

Intent cameraIntent = new Intent(
    android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
getParent().startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);

并使用：

Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
photoImage.setImageBitmap(thumbnail);
photoImage.setVisibility(View.VISIBLE);

但这只是缩略图，如何获得完整的位图？我知道我可以使用自己的 Activity 并使用：

Camera.PictureCallback()

但是有没有办法使用 Intent 来做到这一点？

谢谢！

编辑：

我也尝试过：

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Uri uri = data.getData();
    imageView.setImageURI(uri);
}

它适用于从图库中选择的照片，但对于相机意图，data.getData() 返回 null。

android bitmap camera
8个回答
110
投票

要获得全尺寸的相机图像，您应该将相机指向将图片保存在临时文件中，例如：

    private URI mImageUri;

    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
    File photo;
    try
    {
        // place where to store camera taken picture
        photo = this.createTemporaryFile("picture", ".jpg");
        photo.delete();
    }
    catch(Exception e)
    {
        Log.v(TAG, "Can't create file to take picture!");
        Toast.makeText(activity, "Please check SD card! Image shot is impossible!", 10000);
        return false;
    }
    mImageUri = Uri.fromFile(photo);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageUri);
    //start camera intent
    activity.startActivityForResult(this, intent, MenuShootImage);

private File createTemporaryFile(String part, String ext) throws Exception
{
    File tempDir= Environment.getExternalStorageDirectory();
    tempDir=new File(tempDir.getAbsolutePath()+"/.temp/");
    if(!tempDir.exists())
    {
        tempDir.mkdirs();
    }
    return File.createTempFile(part, ext, tempDir);
}

然后，在图像捕获意图完成工作后 - 只需使用以下代码从 

imageUri
抓取您的图片：

public void grabImage(ImageView imageView)
{
    this.getContentResolver().notifyChange(mImageUri, null);
    ContentResolver cr = this.getContentResolver();
    Bitmap bitmap;
    try
    {
        bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, mImageUri);
        imageView.setImageBitmap(bitmap);
    }
    catch (Exception e)
    {
        Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT).show();
        Log.d(TAG, "Failed to load", e);
    }
}


//called after camera intent finished
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent)
{
    //MenuShootImage is user defined menu option to shoot image
    if(requestCode==MenuShootImage && resultCode==RESULT_OK) 
    {
       ImageView imageView;
       //... some code to inflate/create/find appropriate ImageView to place grabbed image
       this.grabImage(imageView);
    }
    super.onActivityResult(requestCode, resultCode, intent);
}

P.S. 代码需要根据 Android M 中应用的新安全限制进行修改 - FileProvider：

mImageUri
必须用 
FileProvider

打包
44
投票

打开相机并将图像保存到某个特定目录

private String pictureImagePath = "";
private void openBackCamera() {
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = timeStamp + ".jpg";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    pictureImagePath = storageDir.getAbsolutePath() + "/" + imageFileName;
    File file = new File(pictureImagePath);
    Uri outputFileUri = Uri.fromFile(file);
    Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);               
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
    startActivityForResult(cameraIntent, 1);
}

处理图像

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 1) {
    File imgFile = new  File(pictureImagePath);
        if(imgFile.exists()){        
       Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
       ImageView myImage = (ImageView) findViewById(R.id.imageviewTest);
       myImage.setImageBitmap(myBitmap);

        }
    }

}
6
投票

尽管这是一个老问题并且有一个公认的答案，
我想分享我的解决方案。
在这种情况下，您不必创建临时文件。
此外，我们创建了一个选择器，为用户提供以下两种功能：用相机拍照或从图库中选择现有的一张照片。 

    Intent galleryIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    Intent chooser = new Intent(Intent.ACTION_CHOOSER);
    chooser.putExtra(Intent.EXTRA_INTENT, galleryIntent);
    chooser.putExtra(Intent.EXTRA_TITLE, getString(R.string.chooseaction));
    Intent[] intentArray = {cameraIntent};
    chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
    startActivityForResult(chooser, RESULT_LOAD_IMAGE);

我们在这里检索结果：

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    // todo use appropriate resultCode in your case
    if (requestCode == RESULT_LOAD_IMAGE && resultCode == FragmentActivity.RESULT_OK) {
        if (data.getData() != null) {
            // this case will occur in case of picking image from the Gallery,
            // but not when taking picture with a camera
            try {
                Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), data.getData());

                // do whatever you want with the Bitmap ....           

            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            // this case will occur when taking a picture with a camera
            Bitmap bitmap = null;
            Cursor cursor = getActivity().getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                    new String[]{MediaStore.Images.Media.DATA, MediaStore.Images.Media.DATE_ADDED,
                            MediaStore.Images.ImageColumns.ORIENTATION}, MediaStore.Images.Media.DATE_ADDED,
                    null, "date_added DESC");
            if (cursor != null && cursor.moveToFirst()) {
                Uri uri = Uri.parse(cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)));
                String photoPath = uri.toString();
                cursor.close();
                if (photoPath != null) {
                    bitmap = BitmapFactory.decodeFile(photoPath);
                }
            }

            if (bitmap == null) {
                // for safety reasons you can
                // use thumbnail if not retrieved full sized image
                bitmap = (Bitmap) data.getExtras().get("data");
            }
            // do whatever you want with the Bitmap ....
        }

        super.onActivityResult(requestCode, resultCode, data);
    }
}
2
投票

我还使用了 Vicky 的答案，但我必须将 uri 保存到一个包中，以避免在方向更改时丢失它。因此，如果您在倾斜设备后没有从意图中得到结果，可能是因为您的 uri 无法承受方向变化。

static final int CAMERA_CAPTURE_REQUEST = 1;
static final String ARG_CURRENT_PIC_URI = "CURRENT_PIC_URI";


String pictureImagePath = folderName + "/" + imageFileName;
File file = new File(Environment.getExternalStorageDirectory(), pictureImagePath);
Uri outputFileUri = Uri.fromFile(file);

mCurrentPicUri = outputFileUri.getPath();

Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(cameraIntent, CAMERA_CAPTURE_REQUEST);

活动结果代码：

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {

  if (requestCode == CAMERA_CAPTURE_REQUEST && resultCode == Activity.RESULT_OK) 
  {
    File imgFile = new  File(mCurrentPicUri);
    // do something with your image
    // delete uri
    mCurrentPicUri = "";
  }
}

将 uri 保存到包中：

@Override
public void onSaveInstanceState(Bundle outState) {
  super.onSaveInstanceState(outState);
  // save uri to bundle
  outState.putString(ARG_CURRENT_PIC_URI, mCurrentPicUri);
}

在创建过程中从保存的捆绑包中检索它：

if (bundle.containsKey(ARG_CURRENT_PIC_URI))
  mCurrentPicUri = bundle.getString(ARG_CURRENT_PIC_URI);
2
投票

请勿使用

onActivityResult
的数据。我花了很多时间来测试不同的解决方案。相机保存了一张图片（即使您没有在 AndroidManifest 中设置相机和读卡的权限），但随后 
onActivityResult
返回 
data == null
并且 
MediaStore
返回错误的路径。在这些解决方案中，您只需获取最后一个画廊图像，而不是您的照片。

private Uri photoUri;

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    ...
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == CAMERA_RESULT) {
        if (resultCode == RESULT_OK) {
            if (photoUri != null) {
                image.setImageURI(photoUri);
            }
        }
    }
}

private void showCamera() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (intent.resolveActivity(getContext().getPackageManager()) != null) {
        File file = null;
        try {
            file = createImageFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        photoUri = null;
        if (file != null) {
            photoUri = Uri.fromFile(file);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, photoUri);
            startActivityForResult(intent, CAMERA_REQUEST);
        }
    }
}

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File storageDir = getContext().getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    // File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    return File.createTempFile(timeStamp, ".jpg", storageDir);
}
2
投票

还款时间到了。

因此您在清单中拥有权限：

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

您还有提供商元数据：

 <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"></meta-data>
    </provider>

一个遗漏的细节是 (android:authorities applicationId) - 您需要将其添加到您自己的应用程序包名称中。

因此，正如我们在 

xml
上提到的，您在 
res
文件夹下有 
manifest
文件，并在其下创建了 
file_paths
，其中：

<?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>

我们已经完成了复制粘贴第 1 部分。现在开始我们上面的活动 

onCreate(savedInstanceState: Bundle?)
定义这些美丽

    val REQUEST_IMAGE_CAPTURE = 1
    lateinit var currentPhotoPath: String
    var cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)

您可能想查看原始资源，但像往常一样缺少详细信息 Android 开发者：link

另一个缺失的细节是

packageName + ".fileprovider",
小心，如果你已经有方法，你需要给出你自己的包名称。

// org android developers
    private fun dispatchTakePictureIntent() {
        Intent(MediaStore.ACTION_IMAGE_CAPTURE).also { takePictureIntent ->
            // Ensure that there's a camera activity to handle the intent
            takePictureIntent.resolveActivity(packageManager)?.also {
                // Create the File where the photo should go
                val photoFile: File? = try {
                    createImageFile()
                } catch (ex: IOException) {
                    // Error occurred while creating the File
                    ex.message
                    null
                }
                // Continue only if the File was successfully created
                photoFile?.also {
                    val photoURI: Uri = FileProvider.getUriForFile(
                        this,
                        packageName + ".fileprovider",
                        it
                    )
                    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI)
                    startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE)
                }
            }
        }
    }


createImageFile
功能

 // org android developers
    @Throws(IOException::class)
    private fun createImageFile(): File {
        // Create an image file name
        val timeStamp: String = SimpleDateFormat("yyyyMMdd_HHmmss").format(Date())
        val storageDir: File = this!!.getExternalFilesDir(Environment.DIRECTORY_PICTURES)!!
        return File.createTempFile(
            "JPEG_${timeStamp}_", /* prefix */
            ".jpg", /* suffix */
            storageDir /* directory */
        ).apply {
            // Save a file: path for use with ACTION_VIEW intents
            currentPhotoPath = absolutePath
        }

    }

测试。

使用 onClick 事件调用您的 

dispatchTakePictureIntent()
方法，确保允许权限

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
  if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_IMAGE_CAPTURE) {
var  mBitmap_org = MediaStore.Images.Media.getBitmap(
                this.getContentResolver(),
                //Uri.parse(currentPhotoPath)
                Uri.fromFile(File(currentPhotoPath))
            );
        //mImg_display?.setImageBitmap(mBitmap_org)
}
    }

不检查数据，我们将通过imagePath获取数据。如果您正在检查 

Uri.parse(currentPhotoPath)
，请确保它是 
Uri.fromFile(File(currentPhotoPath))

现在您有了位图，有时间花其他时间/天来调整解码大小，保存。

还有一种保存令牌图像的方法，也许你可以帮我看看我应该把它放在哪里，如果我需要将令牌图像保存在图库上

  // org android developers
    private fun galleryAddPic() {
        Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE).also { mediaScanIntent ->
            val f = File(currentPhotoPath)
            mediaScanIntent.data = Uri.fromFile(f)
            sendBroadcast(mediaScanIntent)
        }
    }
1
投票

API 级别 29

我尝试了接受的答案，但接受的答案中使用的 

Environment.getExternalStorageDirectory()
和后续答案中使用的 
Environment.getExternalStoragePublicDirectory()
在 API 级别 29 中均已弃用。API 级别 29 中弃用的第三个答案中使用的 
MediaStore.Images.Media.DATA
也是如此。以下代码（在 Kotlin 中）将完整图像存储在 
MediaStore
中，如针对不同问题的 this stackoverflow 答案 中所示，并且不依赖于 
FileProvider
:

    var imageUri: Uri? = null

    fun takePhoto(view: View?) {
        val values = ContentValues()
        values.put(MediaStore.MediaColumns.DISPLAY_NAME, "myimage.jpg")
        values.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpeg")
        values.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES)
        imageUri = contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)

        val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri)
        startActivityForResult(intent, TAKE_PHOTO_REQUEST)
    }
0
投票

要从相机捕获最大图片尺寸，我希望这些简单的步骤非常有用

 public static Camera mCamera;

Camera.Parameters parameters = mCamera.getParameters();
  parameters.getSupportedPictureSizes();
List<Camera.Size> supportedSizes = parameters.getSupportedPictureSizes();
  mSizePicture1 = supportedSizes.get(0);
  int cameraSize = supportedSizes.size();
  mSizePicture2 = supportedSizes.get(cameraSize - 1);

    if (mSizePicture1.height < mSizePicture2.height)
       mSizePicture = supportedSizes.get(cameraSize - 1);
    else
       mSizePicture = supportedSizes.get(0);

parameters.setPictureSize(mSizePicture.width, mSizePicture.height);

这里，每个手机支持的尺寸是取最大尺寸的，固定为要捕获的图片尺寸。

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