我希望当用户点击按钮时，他可以选择图库或相机，并且该程序可以检索捕获/拾取的照片。我尝试了几件事，但似乎没有任何东西可以完全发挥作用。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);
这就是我尝试通过用户选择的照片检索的方式：
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 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$MethodAndArgsCaller.run(ZygoteInit.java:823)
E/AndroidRuntime(21260): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
E/AndroidRuntime(21260): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(21260): Caused by: java.lang.NullPointerException
E/AndroidRuntime(21260): at com.aquariumzoekenpro.android.LogboekNotitie.onActivityResult(LogboekNotitie.java:1483)
E/AndroidRuntime(21260): at android.app.Activity.dispatchActivityResult(Activity.java:4649)
E/AndroidRuntime(21260): at android.app.ActivityThread.deliverResults(ActivityThread.java:2996)
E/AndroidRuntime(21260): ... 11 more
使用相机拍摄照片并检索也失败。这就是我启动相机的方式：
Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
String filename = "NEWIMAGE1";
imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/"+filename));
i.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(i,2);
这就是我尝试检索拍摄照片的方式：
String filename = "NEWIMAGE1";
String urifilename = filename + ".jpg";
imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getPath()+"/"+urifilename));
this.getContentResolver().notifyChange(imageUri, null);
ContentResolver cr = this.getContentResolver();
photo = android.provider.MediaStore.Images.Media.getBitmap(cr, imageUri);
我从logcat获得的错误：
W/dalvikvm(21424): threadid=1: thread exiting with uncaught exception (group=0x40abc210)
E/AndroidRuntime(21424): FATAL EXCEPTION: main
E/AndroidRuntime(21424): java.lang.OutOfMemoryError
E/AndroidRuntime(21424): at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
E/AndroidRuntime(21424): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:499)
E/AndroidRuntime(21424): at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:555)
E/AndroidRuntime(21424): at android.provider.MediaStore$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，这样我就可以在Imageview中显示它。
提前致谢，
西蒙
答案 0 :(得分：0)
西蒙，我的工作是使用这个意图从画廊中挑选：
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
然后处理这样的选择：
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，你只是耗尽内存创建Bitmap。您应该使用BitmapFactory :: decodeStream并将BitmapFactory.Options设置为将传入图像缩放到您要显示它的视图的大小。
如下所述，要完成答案，请访问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;
}
}