Android的让用户选择/拍摄的照片，从画廊或相机 [英] Android let user pick/capture photo from gallery or camera

问题描述

我想，当用户点击一个按钮，他可以选择画廊或摄像头，该程序可以检索捕获/捡照片。我试了几件事情，但似乎没有完全工作。我就是这样开始的库，以便用户可以挑选一张照片：

I want to that when a user clicks a button, he can choose gallery or camera, and that the program can retrieve the captured/picked photo. I tried a couple of things, but nothing seems to work completely. This is how I start the gallery so the user can pick a photo:

    Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(i,3);

这是我尝试通过用户检索拾取的照片：

And this is how I try to retrieve the by the user picked photo:

        Uri selectedImage = data.getData();

        filename = "NEWIMAGE";
        String[] filePathColumn = { MediaStore.Images.Media.DATA };

        Cursor cursor = getContentResolver().query(selectedImage,
                filePathColumn, null, null, null);
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        String picturePath = cursor.getString(columnIndex);
        cursor.close();
        final int REQUIRED_SIZE=70;
        int scale = 1;
        BitmapFactory.Options options = new BitmapFactory.Options();
        if (options.outHeight > REQUIRED_SIZE || options.outWidth > REQUIRED_SIZE) {
            scale = (int)Math.pow(2, (int) Math.round(Math.log(REQUIRED_SIZE / 
               (double) Math.max(options.outHeight, options.outWidth)) / Math.log(0.5)));
        }

        options.inJustDecodeBounds = true;
        options.inSampleSize = scale;           
        photo = BitmapFactory.decodeFile(picturePath, options);

当我运行它的错误：

E/AndroidRuntime(21260): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=3, result=-1, data=Intent { dat=content://media/external/images/media/2449 }} to activity {com.aquariumzoekenpro.android/com.aquariumzoekenpro.android.LogboekNotitie}: java.lang.NullPointerException
E/AndroidRuntime(21260):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3000)
E/AndroidRuntime(21260):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3043)
E/AndroidRuntime(21260):    at android.app.ActivityThread.access$1100(ActivityThread.java:127)
E/AndroidRuntime(21260):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1188)
E/AndroidRuntime(21260):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(21260):    at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(21260):    at android.app.ActivityThread.main(ActivityThread.java:4441)
E/AndroidRuntime(21260):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(21260):    at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(21260):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
E/AndroidRuntime(21260):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
E/AndroidRuntime(21260):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(21260): Caused by: java.lang.NullPointerException
E/AndroidRuntime(21260):    at com.aquariumzoekenpro.android.LogboekNotitie.onActivityResult(LogboekNotitie.java:1483)
E/AndroidRuntime(21260):    at android.app.Activity.dispatchActivityResult(Activity.java:4649)
E/AndroidRuntime(21260):    at android.app.ActivityThread.deliverResults(ActivityThread.java:2996)
E/AndroidRuntime(21260):    ... 11 more

捕获与相机的照片和检索也会失败。我就是这样开始的相机：

Capturing a photo with the camera and retrieving also fails. This is how I start the camera:

    Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);     
    String filename = "NEWIMAGE1";
    imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/"+filename));
    i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    startActivityForResult(i,2);

这是我尝试找回拍摄的照片：

And this is how I try to retrieve the captured photo:

String filename = "NEWIMAGE1";
String urifilename = filename + ".jpg";
imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/"+urifilename));
this.getContentResolver().notifyChange(imageUri, null);
ContentResolver cr = this.getContentResolver();     
photo = android.provider.MediaStore.Images.Media.getBitmap(cr, imageUri);

我从logcat中得到的错误：

The error I get from the logcat:

W/dalvikvm(21424): threadid=1: thread exiting with uncaught exception (group=0x40abc210)
E/AndroidRuntime(21424): FATAL EXCEPTION: main
E/AndroidRuntime(21424): java.lang.OutOfMemoryError
E/AndroidRuntime(21424):    at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
E/AndroidRuntime(21424):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:499)
E/AndroidRuntime(21424):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:555)
E/AndroidRuntime(21424):    at android.provider.MediaStore$Images$Media.getBitmap(MediaStore.java:710)
E/AndroidRuntime(21424):    at com.aquariumzoekenpro.android.LogboekNotitie.onActivityResult(LogboekNotitie.java:1429)
E/AndroidRuntime(21424):    at android.app.Activity.dispatchActivityResult(Activity.java:4649)
E/AndroidRuntime(21424):    at android.app.ActivityThread.deliverResults(ActivityThread.java:2996)
E/AndroidRuntime(21424):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2451)
E/AndroidRuntime(21424):    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2492)
E/AndroidRuntime(21424):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1997)
E/AndroidRuntime(21424):    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3371)
E/AndroidRuntime(21424):    at android.app.ActivityThread.access$700(ActivityThread.java:127)
E/AndroidRuntime(21424):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1162)
E/AndroidRuntime(21424):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(21424):    at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(21424):    at android.app.ActivityThread.main(ActivityThread.java:4441)
E/AndroidRuntime(21424):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(21424):    at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(21424):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
E/AndroidRuntime(21424):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
E/AndroidRuntime(21424):    at dalvik.system.NativeStart.main(Native Method)

所以，我希望让用户选择要么选择一个图片从画廊或捕捉的相机中的照片。然后，我希望该计划得到了回升，或在原有的品质拍摄的图像，这样我就可以在ImageView的或东西表现出来。

So I want to let the user choose to either pick an image from the gallery or to capture a photo with the camera. Then I want the program to get the picked or captured image in the original quality, so I can show it in an Imageview or something.

在此先感谢，

西蒙

推荐答案

西门，我有这个工作，使用这种意图从库中挑选：

Simon, I have this working for picking from the gallery using this intent:

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");

和再处理的选择是这样的：

And then handling the choice like this:

  mFilename=null;
  mPath=null;

  Uri selectedImage = data.getData();
  final String[] filePathColumn = { MediaColumns.DATA, MediaColumns.DISPLAY_NAME };
  Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);

  // some devices (OS versions return an URI of com.android instead of com.google.android 
  if (selectedImage.toString().startsWith("content://com.android.gallery3d.provider"))  
  {
      // use the com.google provider, not the com.android provider. 
      selectedImage = Uri.parse(selectedImage.toString().replace("com.android.gallery3d","com.google.android.gallery3d"));
  }

  if (cursor != null) {
      cursor.moveToFirst();
      int columnIndex = cursor.getColumnIndex(MediaColumns.DATA);

      // if it is a picasa image on newer devices with OS 3.0 and up
      if (selectedImage.toString().startsWith("content://com.google.android.gallery3d"))
      {
          columnIndex = cursor.getColumnIndex(MediaColumns.DISPLAY_NAME);
          if (columnIndex != -1)
          {
              final Uri uriurl = selectedImage;
              // should do this in a background thread, since we are fetching a large image from the web
              mFilename = getGalleryFile(activity, uriurl);
          }
      }
      else
      {
          // it is a regular local image file
          String filePath = cursor.getString(columnIndex);
          cursor.close();
          mFilename = filePath;
      }
  }
  // If it is a picasa image on devices running OS prior to 3.0
  else if (selectedImage != null && selectedImage.toString().length() > 0)
  {
      final Uri uriurl = selectedImage;
      // should do this in a background thread, since we are fetching a large image from the web
      mFilename = getGalleryFile(activity, uriurl);
   }

至于你想要什么的摄像头部分，你在做什么看起来不错，你只是运行内存创建位图。您应该使用BitmapFactory ::德codeStream设置为输入的图像缩放到视图你会在显示它的大小BitmapFactory.Options。

And as for the camera part of what you want, what you're doing looks fine you are just running out of memory creating the Bitmap. You should use BitmapFactory::decodeStream with BitmapFactory.Options set to scale the incoming image to the size of the View you're going to display it in.

如下面所解释的，以完成这里答案是getGalleryFile：

As explained below, to complete the answer here is getGalleryFile:

public static String getGalleryFile(Activity activity, Uri url)
{
    String fileName=null;
    File path;

    try {
        // getCameraStoragePath is a function in my activity
        // that returns a location where I'm writing files
        // you could use Environment.getExternalStorageDirectory()
        // or ....
        path = new File(MyTask.getCameraStoragePath());
    } catch (Exception e1) {
        // todo: handle exception
        return null;
    }

    SimpleDateFormat timeStampFormat = new SimpleDateFormat("yyyyMMddHHmmssSS");
    fileName = "gallery." + timeStampFormat.format(new java.util.Date()) + ".jpg";
    File out = new File(path, fileName);

    try {
        InputStream is = null;
        if (url.toString().startsWith("content://com.google.android.gallery3d"))
        {
            is=activity.getContentResolver().openInputStream(url);
        }
        else
        {
            is=new URL(url.toString()).openStream();
        }

        OutputStream os = new FileOutputStream(out);

        byte[] buffer = new byte[1024];
        int len;
        while ((len = is.read(buffer)) != -1)
        {
            os.write(buffer, 0, len);
        }

        os.close();
        return out.getAbsolutePath();
    }
    catch (Exception ex)
    {
        // todo: handle exception
        return null;
    }
}

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