如何捕获图像并使用本机Android相机存储它

Question

我在捕获图像并将其存储在本机相机应用程序时遇到问题.以下是我的一些代码示例.

_path = Environment.getExternalStorageDirectory() + "make_machine_example.jpg";
File file = new File( _path );
Uri outputFileUri = Uri.fromFile( file );

Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

startActivityForResult( intent, 0 );

拍完照片后我又回到原来的活动中,当我通过Android DDMS文件浏览器导航到我的SD卡时,图片不存在.任何人都知道为什么没有得救？

Answer 1

这是最终产品,以防任何人仍在访问此主题:

public class CameraCapture extends Activity {

    protected boolean _taken = true;
    File sdImageMainDirectory;

    protected static final String PHOTO_TAKEN = "photo_taken";

    @Override
    public void onCreate(Bundle savedInstanceState) {

        try {

            super.onCreate(savedInstanceState);         
                    File root = new File(Environment
                            .getExternalStorageDirectory()
                            + File.separator + "myDir" + File.separator);
                    root.mkdirs();
                    sdImageMainDirectory = new File(root, "myPicName");


                startCameraActivity();
            }
        } catch (Exception e) {
            finish();
            Toast.makeText(this, "Error occured. Please try again later.",
                    Toast.LENGTH_SHORT).show();
        }

    }

    protected void startCameraActivity() {

        Uri outputFileUri = Uri.fromFile(sdImageMainDirectory);

        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

        startActivityForResult(intent, 0);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (resultCode) {
        case 0:
            finish();
            break;

        case -1:

            try {
                StoreImage(this, Uri.parse(data.toURI()),
                        sdImageMainDirectory);
            } catch (Exception e) {
                e.printStackTrace();
            }

            finish();
            startActivity(new Intent(CameraCapture.this, Home.class));

        }

    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        if (savedInstanceState.getBoolean(CameraCapture.PHOTO_TAKEN)) {
            _taken = true;
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putBoolean(CameraCapture.PHOTO_TAKEN, _taken);
    }

        public static void StoreImage(Context mContext, Uri imageLoc, File imageDir) {
        Bitmap bm = null;
        try {
            bm = Media.getBitmap(mContext.getContentResolver(), imageLoc);
            FileOutputStream out = new FileOutputStream(imageDir);
            bm.compress(Bitmap.CompressFormat.JPEG, 100, out);
            bm.recycle();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

Answer 2

您是否检查过Environment.getExternalStorageDirectory()的输出是什么,因为如果它不包含尾随文件分隔符(/),那么您的映像将最终位于不驻留在SD卡上的目录中,例如:

 /mnt/sdcardmake_machine_example.jpg

当你真正想要的是:

 /mnt/sdcard/make_machine_example.jpg

请尝试使用此代码:

 _path = Environment.getExternalStorageDirectory() + File.separator +  "make_machine_example.jpg";

Answer 3

1.只是用

new File(Environment.getExternalStorageDirectory(),  "make_machine_example.jpg");

并且不要为分隔符而烦恼.

2.之前面临同样的问题.SenseUI手机有一个不创建文件的自定义相机应用程序.你用的是什么设备？它可能已经在最新的设备中修复,但它仍然可能是一个问题.所以这里有一个完整的示例如何克服它将照片保存到文件的问题.