Android的 - 以图片而不preVIEW [英] Android - Take picture without preview

问题描述

我想我的应用程序开始运行时拍摄照片时不preVIEW，立即后保存在新文件夹中的图片 - pictures123，在根文件夹。
可能有人请告诉我，什么是错在我的code？

  @覆盖
保护无效的onCreate（捆绑savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;
    文件目录=新的文件（Environment.getExternalStorageDirectory（）+/ pictures123 /）;    如果（！directory.exists（））{
        directory.mkdir（）;
    }    摄像头摄像头= Camera.open（0）;
    Camera.Parameters参数= camera.getParameters（）;
    parameters.setPictureFormat（ImageFormat.JPEG）;
    camera.setParameters（参数）;
    SurfaceView MVIEW =新SurfaceView（getBaseContext（））;
    camera.set previewDisplay（mview.getHolder（））;
    camera.set previewDisplay（NULL）;
    camera.start preVIEW（）;
    camera.takePicture（NULL，NULL，photoCallback）;
    camera.stop preVIEW（）;
}Camera.PictureCallback photoCallback =新Camera.PictureCallback（）{
    公共无效onPictureTaken（字节[]数据，相机摄像头）{        尝试{
            。字符串根= Environment.getExternalStorageDirectory（）的toString（）;
            文件MYDIR =新的文件（根+/ pictures123）;
            档案文件=新的文件（MYDIRpic1.jpeg）;
            FileOutputStream中出=新的FileOutputStream（文件）;
            out.write（数据）;
            了out.flush（）;
            out.close（）;
        }赶上（FileNotFoundException异常五）{
            e.printStackTrace（）;        }赶上（IOException异常五）{
            e.printStackTrace（）;        }赶上（例外五）
        {
            e.printStackTrace（）;
        }
        完（）;    }
};
 

权限：

 ＆LT;使用许可权的android：NAME =android.permission.WRITE_EXTERNAL_STORAG​​E/＆GT;
＆LT;使用许可权的android：NAME =android.permission.READ_EXTERNAL_STORAG​​E/＆GT;
＆LT;使用许可权的android：NAME =android.permission.CAMERA/＆GT;
＆LT;使用特征的android：NAME =android.hardware.camera/＆GT;
 

解决方案

您不能把没有preVIEW图片，但你不必在屏幕上显示preVIEW。您可以直接输出到而不是表面纹理（API 11 +）。

请参阅this回答了解更多详情。

I am trying to take a picture without preview, immediately when my application starts running and after that to save the picture in new folder - "pictures123", in the root folder. Could someone please tell me what's wrong in my code?

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    File directory = new File(Environment.getExternalStorageDirectory() + "/pictures123/");

    if (!directory.exists()) {
        directory.mkdir();
    }

    Camera camera = Camera.open(0);
    Camera.Parameters parameters = camera.getParameters();
    parameters.setPictureFormat(ImageFormat.JPEG);
    camera.setParameters(parameters);
    SurfaceView mview = new SurfaceView(getBaseContext());
    camera.setPreviewDisplay(mview.getHolder());
    camera.setPreviewDisplay(null);
    camera.startPreview();
    camera.takePicture(null,null,photoCallback);
    camera.stopPreview();
}

Camera.PictureCallback photoCallback=new Camera.PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {

        try {
            String root = Environment.getExternalStorageDirectory().toString();
            File myDir = new File(root + "/pictures123");
            File file = new File (myDir, "pic1.jpeg");
            FileOutputStream out = new FileOutputStream(file);
            out.write(data);
            out.flush();
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();

        } catch (IOException e) {
            e.printStackTrace();

        } catch (Exception e)
        {
            e.printStackTrace();
        }
        finish();

    }
};

permissions:

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

解决方案

You can't take a picture without a preview, but you don't have to show the preview on screen. You can direct the output to a SurfaceTexture instead (API 11+).

See this answer for more details.

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