我的网站上有一个表单，允许用户上传照片。我的Android应用程序使用WebView允许用户访问该站点。点击上传按钮，该应用程序允许用户在图库中已有的图像之间进行选择，或者拍摄新照片并上传该图像。我用过的代码是
showAttachmentDialog由openFileChooser
调用private void showAttachmentDialog(ValueCallback<Uri> uploadMsg) {
this.mUploadMessage = uploadMsg;
File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyApp");
// Create the storage directory if it does not exist
if (! imageStorageDir.exists()){
imageStorageDir.mkdirs();
}
File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
this.imageUri= Uri.fromFile(file);
final List<Intent> cameraIntents = new ArrayList<Intent>();
final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
final PackageManager packageManager = getPackageManager();
final List<ResolveInfo> listCam = packageManager.queryIntentActivities(captureIntent, 0);
for(ResolveInfo res : listCam) {
final String packageName = res.activityInfo.packageName;
final Intent intent = new Intent(captureIntent);
intent.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
intent.setPackage(packageName);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
cameraIntents.add(intent);
}
// mUploadMessage = uploadMsg;
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
Intent chooserIntent = Intent.createChooser(intent,"Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, cameraIntents.toArray(new Parcelable[]{}));
this.startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
}
我的onActivityResult
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == this.mUploadMessage) {
return;
}
Uri result;
if (resultCode != RESULT_OK) {
result = null;
} else {
result = intent == null ? this.imageUri : intent.getData(); // retrieve from the private variable if the intent is null
}
this.mUploadMessage.onReceiveValue(result);
this.mUploadMessage = null;
}
}
我希望能够在上传之前更改图像的大小，我希望这可以在手机上完成，而不是在网页上完成。我还想在完成后从手机中删除已调整大小的图像并保留原型。你能建议我这样做吗？我在SO中展示了几个案例，建议创建一个位图并使用createScaledBitmap将其调整为所需的大小，但我不确定在我的情况下哪个是最好的方法。这应该在哪里发生？在我的onActivityResult中？ 提前谢谢！
-------------------- EDIT ----------------------
private File imageStorageDir，file;
我在我的主Activity中声明了这些，并在我的onActivityResult
中添加了以下代码段String newPath=file.getAbsolutePath();
Bitmap bMap= BitmapFactory.decodeFile(newPath);
Bitmap out = Bitmap.createScaledBitmap(bMap, 150, 150, false);
File resizedFile = new File(imageStorageDir, "resized.png");
OutputStream fOut=null;
try {
fOut = new BufferedOutputStream(new FileOutputStream(resizedFile));
out.compress(Bitmap.CompressFormat.PNG, 100, fOut);
fOut.flush();
fOut.close();
bMap.recycle();
out.recycle();
} catch (Exception e) { // TODO
}
现在，在使用相机拍照时，图像正在调整大小并上传，但是当我使用图库时，我得到了NullPointerException
05-23 10:12:50.354: E/BitmapFactory(1376): Unable to decode stream: java.io.FileNotFoundException: /storage/sdcard/Pictures/MyApp/IMG_1400854361171.jpg: open failed: ENOENT (No such file or directory)
05-23 10:12:50.364: D/AndroidRuntime(1376): Shutting down VM
05-23 10:12:50.414: W/dalvikvm(1376): threadid=1: thread exiting with uncaught exception (group=0x41465700)
05-23 10:12:50.494: E/AndroidRuntime(1376): FATAL EXCEPTION: main
05-23 10:12:50.494: E/AndroidRuntime(1376): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://media/external/images/media/76 }} to activity {com.example.sinatra19/com.example.sinatra19.Sinatra22Activity}: java.lang.NullPointerException
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.app.ActivityThread.deliverResults(ActivityThread.java:3367)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3410)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.app.ActivityThread.access$1100(ActivityThread.java:141)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.os.Handler.dispatchMessage(Handler.java:99)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.os.Looper.loop(Looper.java:137)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.app.ActivityThread.main(ActivityThread.java:5103)
05-23 10:12:50.494: E/AndroidRuntime(1376): at java.lang.reflect.Method.invokeNative(Native Method)
05-23 10:12:50.494: E/AndroidRuntime(1376): at java.lang.reflect.Method.invoke(Method.java:525)
05-23 10:12:50.494: E/AndroidRuntime(1376): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-23 10:12:50.494: E/AndroidRuntime(1376): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-23 10:12:50.494: E/AndroidRuntime(1376): at dalvik.system.NativeStart.main(Native Method)
05-23 10:12:50.494: E/AndroidRuntime(1376): Caused by: java.lang.NullPointerException
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:482)
05-23 10:12:50.494: E/AndroidRuntime(1376): at com.example.sinatra19.Sinatra22Activity.onActivityResult(Sinatra22Activity.java:158)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.app.Activity.dispatchActivityResult(Activity.java:5322)
05-23 10:12:50.494: E/AndroidRuntime(1376): at android.app.ActivityThread.deliverResults(ActivityThread.java:3363)
05-23 10:12:50.494: E/AndroidRuntime(1376): ... 11 more
----------------------- EDIT2 ----------------------- -
这个snipet
String newPath=getRealPathFromURI(getApplicationContext(), result);
Bitmap bMap= BitmapFactory.decodeFile(newPath);
Bitmap out = Bitmap.createScaledBitmap(bMap, 150, 150, false);
File resizedFile = new File(imageStorageDir, "resize.png");
OutputStream fOut=null;
try {
fOut = new BufferedOutputStream(new FileOutputStream(resizedFile));
out.compress(Bitmap.CompressFormat.PNG, 100, fOut);
fOut.flush();
fOut.close();
bMap.recycle();
out.recycle();
} catch (Exception e) { // TODO
}
this.mUploadMessage.onReceiveValue(Uri.fromFile(resizedFile));
this.mUploadMessage = null;
调用
public String getRealPathFromURI(Context context, Uri contentUri) {
Cursor cursor = null;
try {
String[] proj = { MediaStore.Images.Media.DATA };
cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} finally {
if (cursor != null) {
cursor.close();
}
}
}
当用户从相册中选择照片时从图库中选择照片并崩溃时，该作品正常工作。我需要结合它们的方式
答案 0 :(得分：4)
所有需要的是if语句来检查用户选择的方法。文件是在showAttachmentDialog中创建的，因此私有的imageUri总是拥有该文件的Uri。当用户选择相机选项时，结果也具有该值，而当他选择图库结果时，具有从galery中选择的图像的Uri
if(result==this.imageUri){
newPath=file.getAbsolutePath();}
else{
newPath=getRealPathFromURI(getApplicationContext(), result);}
最终代码是
@Override
//Receives the results of startActivityFromResult
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
String newPath;
if (requestCode == FILECHOOSER_RESULTCODE) {
if (null == this.mUploadMessage) {
return;
}
Uri result;
if (resultCode != RESULT_OK) {
result = null;
} else {
result = intent == null ? this.imageUri : intent.getData(); // retrieve from the private variable if the intent is null
Log.e("result",result.toString() );
Log.e("intent",this.imageUri.toString() );
}
if(result==this.imageUri){
newPath=file.getAbsolutePath();}
else{
newPath=getRealPathFromURI(getApplicationContext(), result);}
Bitmap bMap= BitmapFactory.decodeFile(newPath);
Bitmap out = Bitmap.createScaledBitmap(bMap, 150, 150, false);
File resizedFile = new File(imageStorageDir, "resize.png");
OutputStream fOut=null;
try {
fOut = new BufferedOutputStream(new FileOutputStream(resizedFile));
out.compress(Bitmap.CompressFormat.PNG, 100, fOut);
fOut.flush();
fOut.close();
bMap.recycle();
out.recycle();
} catch (Exception e) { // TODO
}
this.mUploadMessage.onReceiveValue(Uri.fromFile(resizedFile));
this.mUploadMessage = null;
//resizedFile.delete();
}
}
public String getRealPathFromURI(Context context, Uri contentUri) {
Cursor cursor = null;
try {
String[] proj = { MediaStore.Images.Media.DATA };
cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} finally {
if (cursor != null) {
cursor.close();
}
}
}