@dedetuga said in Qt5.13 on android alternative to Qcameraviewfinder:
It works in QML but I don't know programe in QML and my project is in c++ (QTWidgets),
I'm trying to use the Java native alternative but I don't know much of JNI and I'm stuck. Googling quite a lot didn't help much yet. It throw an exception just after on cursor
Probably it is already on uri.
i.e.:
QAndroidJniObject uri = data.callObjectMethod("getData", "()Landroid/net/Uri;")
Because logging statement __DV(uri.isValid()); already prints false:
D myapp: CImageCaptureAndroid::shootPicture
D myapp: CImageCaptureAndroid::handleActivityResult
D myapp: data.isValid() = > true <
D myapp: data.toString() = > Intent { act=inline-data (has extras) } <
D myapp: uri.isValid() = > false < /// <== Already wrong here
D myapp: uri.toString() = > < /// <== thus, meaningless
D myapp: data_android.isValid() = > true <
D myapp: data_android.toString() = > _data <
D myapp: object_data_android = > 0x95 <
D myapp: contentResolver.isValid() = > true <
D myapp: contentResolver.toString() = > android.app.ContextImpl$ApplicationContentResolver@b813db1 <
D myapp: cursor.isValid() = > false < /// <== Wrong here too
D myapp: cursor.toString() = > < /// <== Meaningless too
D myapp: In If9
F mple.myapp: java_vm_ext.cc:561] JNI DETECTED ERROR IN APPLICATION: JNI GetMethodID called with pending exception java.lang.NullPointerException: uri
F mple.myapp: java_vm_ext.cc:561] at java.lang.Object com.android.internal.util.Preconditions.checkNotNull(java.lang.Object, java.lang.Object) (Preconditions.java:128)
Source: https://stackoverflow.com/questions/63127412/qt-and-android-handleactivityresult-returned-from-a-camera-uri-null
My current header file is:
#pragma once
#include <QObject>
#include <QtAndroidExtras/QAndroidActivityResultReceiver>
#include <QtAndroidExtras/QtAndroid>
#include <QtAndroidExtras/QAndroidJniEnvironment>
#include <QtAndroidExtras/QAndroidJniObject>
#include <QDebug>
class CImageCaptureAndroid : public QObject, public QAndroidActivityResultReceiver
{
Q_OBJECT
public:
CImageCaptureAndroid();
void shootPicture();
void handleActivityResult(int receiverRequestCode, int resultCode, const QAndroidJniObject & data) override;
signals:
void picturePath(QString);
};
And then the source file:
#include "cimagecaptureandroid.h"
#include "qt_utils.h"
#include <QFile>
#include <QDir>
#include <QStandardPaths>
CImageCaptureAndroid::CImageCaptureAndroid()
{
}
void CImageCaptureAndroid::shootPicture()
{
__DL("CImageCaptureAndroid::shootPicture");
QAndroidJniObject ACTION_CAPTURE = QAndroidJniObject::fromString("android.provider.MediaStore.ACTION_IMAGE_CAPTURE");
QAndroidJniObject ACTION_IMAGE_CAPTURE = QAndroidJniObject::getStaticObjectField("android/provider/MediaStore", "ACTION_IMAGE_CAPTURE", "Ljava/lang/String;");
QAndroidJniObject intent("android/content/Intent", "(Ljava/lang/String;)V", ACTION_IMAGE_CAPTURE.object<jstring>());
if (ACTION_CAPTURE.isValid() && intent.isValid()) {
QtAndroid::startActivity(intent.object<jobject>(), 101, this);
} else {
assert( false );
}
}
void CImageCaptureAndroid::handleActivityResult(int receiverRequestCode, int resultCode, const QAndroidJniObject &data)
{
__DL("CImageCaptureAndroid::handleActivityResult");
__DV(data.isValid());
__DV(data.toString());
jint RESULT_OK = QAndroidJniObject::getStaticField<jint>("android/app/Activity", "RESULT_OK");
if (receiverRequestCode == 101 && resultCode == RESULT_OK) {
QAndroidJniObject uri = data.callObjectMethod("getData", "()Landroid/net/Uri;");
__DV(uri.isValid());
__DV(uri.toString());
QAndroidJniObject data_android = QAndroidJniObject::getStaticObjectField("android/provider/MediaStore$MediaColumns", "DATA", "Ljava/lang/String;");
__DV(data_android.isValid());
__DV(data_android.toString());
QAndroidJniEnvironment env;
jobjectArray object = (jobjectArray)env->NewObjectArray(1, env->FindClass("java/lang/String"), NULL);
jobject object_data_android = env->NewStringUTF(data_android.toString().toStdString().c_str());
__DV(object_data_android);
env->SetObjectArrayElement(object, 0, object_data_android);
QAndroidJniObject contentResolver = QtAndroid::androidActivity().callObjectMethod("getContentResolver", "()Landroid/content/ContentResolver;");
__DV(contentResolver.isValid());
__DV(contentResolver.toString());
QAndroidJniObject cursor = contentResolver.callObjectMethod("query", "(Landroid/net/Uri;[Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)Landroid/database/Cursor;", uri.object<jobject>(), object, NULL, NULL, NULL);
__DV(cursor.isValid());
__DV(cursor.toString());
__DL("In If9");
jint columnIndex = cursor.callMethod<jint>("getColumnIndex", "(Ljava/lang/String;)I", data_android.object<jstring>());
__DL("In If10");
cursor.callMethod<jboolean>("moveToFirst", "()Z");
__DL("In If11");
QAndroidJniObject result = cursor.callObjectMethod("getString", "(I)Ljava/lang/String;", columnIndex);
__DL("In If12");
QFile imageFile(result.toString());
QDir dir;
if(dir.exists("images")){
__DL("Folder already exists");
}else {
dir.mkdir("images");
}
QStringList splitedImagePath = result.toString().split("/");
QString imageName = splitedImagePath.value(splitedImagePath.length() - 1);
QString dataimgFile = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation) + "/images/" + imageName;
// /data/data/org.qtproject.feather/files/images/offLight_Button.png
if (imageFile.exists()) {
QFile cdbfile(dataimgFile);
if (!cdbfile.exists()) {
if(!imageFile.copy(dataimgFile))
__DL("Error :copy failed");
QFile::setPermissions(dataimgFile, QFile::WriteOwner | QFile::ReadOwner);
} else {
__DL("image exits already no need to copy");
QFile::setPermissions(dataimgFile, QFile::WriteOwner | QFile::ReadOwner);
}
} else {
__mDV("img Not exit in Assert ", dataimgFile);
}
QString imagePath = "file://" + dataimgFile;
// this->deleteLater();
emit picturePath(imagePath);
}
}