Android 让用户从图库或相机中挑选/捕捉照片
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【中文标题】Android 让用户从图库或相机中挑选/捕捉照片【英文标题】：Android let user pick/capture photo from gallery or camera 【发布时间】：2012-12-18 02:29:22 【问题描述】：我希望当用户单击按钮时，他可以选择图库或相机，并且程序可以检索捕获/挑选的照片。我尝试了几件事，但似乎没有什么能完全奏效。这就是我启动图库的方式，以便用户可以选择照片：
Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i,3);
这就是我尝试检索用户选择的照片的方式：
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);
运行时的错误：
E/AndroidRuntime(21260): java.lang.RuntimeException: Failure delivering result ResultInfowho=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$MethodAndArgsCaller.run(ZygoteInit.java:823)
E/AndroidRuntime(21260): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
E/AndroidRuntime(21260): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(21260): Caused by: java.lang.NullPointerException
E/AndroidRuntime(21260): at com.aquariumzoekenpro.android.LogboekNotitie.onActivityResult(LogboekNotitie.java:1483)
E/AndroidRuntime(21260): at android.app.Activity.dispatchActivityResult(Activity.java:4649)
E/AndroidRuntime(21260): at android.app.ActivityThread.deliverResults(ActivityThread.java:2996)
E/AndroidRuntime(21260): ... 11 more
使用相机拍摄照片并检索也失败。这就是我启动相机的方式：
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
String filename = "NEWIMAGE1";
imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/"+filename));
i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(i,2);
这就是我尝试检索捕获的照片的方式：
String filename = "NEWIMAGE1";
String urifilename = filename + ".jpg";
imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/"+urifilename));
this.getContentResolver().notifyChange(imageUri, null);
ContentResolver cr = this.getContentResolver();
photo = android.provider.MediaStore.Images.Media.getBitmap(cr, imageUri);
我从 logcat 得到的错误：
W/dalvikvm(21424): threadid=1: thread exiting with uncaught exception (group=0x40abc210)
E/AndroidRuntime(21424): FATAL EXCEPTION: main
E/AndroidRuntime(21424): java.lang.OutOfMemoryError
E/AndroidRuntime(21424): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
E/AndroidRuntime(21424): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:499)
E/AndroidRuntime(21424): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:555)
E/AndroidRuntime(21424): at android.provider.MediaStore$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)
所以我想让用户选择从图库中选择图像或使用相机拍摄照片。然后我希望程序以原始质量获取拾取或捕获的图像，以便我可以在 Imageview 或其他内容中显示它。
提前致谢，
西蒙
【问题讨论】：
【参考方案1】：Simon，我正在使用这个意图从画廊中挑选：
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
然后像这样处理选择：
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);
至于你想要的相机部分，你正在做的事情看起来很好，你只是用完了创建位图的内存。您应该使用 BitmapFactory::decodeStream 并设置 BitmapFactory.Options 以将传入的图像缩放到您要在其中显示它的 View 的大小。
如下所述，在这里完成答案是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;
【讨论】：
非常感谢我去试试！ 我认为方法“getGalleryFile”不存在 不，它不存在，这是我编写的一个函数，用于获取远程文件并将其复制到本地文件。我会将它作为示例添加到答案中，但我认为应该对其进行重组以在单独的线程中获取文件。以上是关于Android 让用户从图库或相机中挑选/捕捉照片的主要内容，如果未能解决你的问题，请参考以下文章