1

你好朋友我在我的项目中使用以下代码。

权限：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA"/>

XML 文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:text="Camera Test" />
    <ImageView android:id="@+id/camera_image"
        android:layout_width="wrap_content" android:layout_height="wrap_content" />
</LinearLayout>

代码（Java 文件）：

public class ImageInfo extends Activity {
        private static final int CAMERA_PIC_REQUEST = 1111;
    private ImageView mImage;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mImage = (ImageView) findViewById(R.id.camera_image);
        //1
        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, CAMERA_PIC_REQUEST);
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if(resultCode != RESULT_CANCELED)   {
            if(requestCode == CAMERA_PIC_REQUEST){
                //2
                System.out.println("Request"+requestCode+"result"+resultCode);
                Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
                //  mImage.setImageBitmap(thumbnail);
                //3
                ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                thumbnail.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
                //4
                File file = new File(Environment.getExternalStorageDirectory()+"/saved_images/image.jpeg");
                try {
                    file.createNewFile();
                    FileOutputStream fo = new FileOutputStream(file);
                    //5
                    fo.write(bytes.toByteArray());
                    fo.close();
                    Intent intent=new Intent( this,Info.class);
                    startActivity(intent);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        }
    }
}

我能够成功操作相机并拍摄图像，但正在通过 name_date.jpg 在 android 的 DCIM 目录（默认目录）中创建额外的图像副本，请帮助删除所有这些文件。感谢和问候.....

4

3 回答 3

3

这是您从 dcim 文件夹中删除文件问题的完整解决方案。

just copy and paste this method. And call it whenever necessary.
private void deleteLatest() {
        // TODO Auto-generated method stub
        File f = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera" );

        //Log.i("Log", "file name in delete folder :  "+f.toString());
        File [] files = f.listFiles();

        //Log.i("Log", "List of files is: " +files.toString());
        Arrays.sort( files, new Comparator<Object>()
                {
            public int compare(Object o1, Object o2) {

                if (((File)o1).lastModified() > ((File)o2).lastModified()) {
                    //         Log.i("Log", "Going -1");
                    return -1;
                } else if (((File)o1).lastModified() < ((File)o2).lastModified()) {
                    //     Log.i("Log", "Going +1");
                    return 1;
                } else {
                    //     Log.i("Log", "Going 0");
                    return 0;
                }
            }

                });

        //Log.i("Log", "Count of the FILES AFTER DELETING ::"+files[0].length());
        files[0].delete();

    }
于 2012-08-09T07:22:01.487 回答
0

与@vipsy 链接的线程一样，您可以指定文件路径URI

File fileDir = new File(Environment.getExternalStorageDirectory() +
    "/saved_images");
fileDir.mkdirs();

File file = new File(fileDir, "image.jpg");

Uri outputFileUri = Uri.fromFile(file);
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

这样相机会将图像保存到指定路径而不是 DCIM 文件夹。您不必手动复制它，也不必删除任何内容。

编辑：您必须事先在 sdcard 上创建文件夹，也许这就是问题所在。否则，这应该有效。

于 2012-08-09T07:19:32.090 回答
0 
   File fileOrDirectory= new File(Environment.getExternalStorageDirectory() +
    "/saved_images");

here fileOrDirectory is a path where you are saving images captured by camera .
you can call this method passing file directory when u need;



 void DeleteRecursive(File fileOrDirectory) {
        if (fileOrDirectory.isDirectory())
            for (File child : fileOrDirectory.listFiles())
                DeleteRecursive(child);

        fileOrDirectory.delete();
    }
于 2012-08-09T07:33:48.040 回答