Qt调用Java程序打开Android图像库的示例

// http://www.amin-ahmadi.com package com.amin.QtAndroidGallery; import org.qtproject.qt5.android.bindings.QtApplication; import org.qtproject.qt5.android.bindings.QtActivity; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import java.io.File; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; public class QtAndroidGallery extends QtActivity { public static native void fileSelected(String fileName); static final int REQUEST_OPEN_IMAGE = 1; private static QtAndroidGallery m_instance; public QtAndroidGallery() { m_instance = this; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override protected void onDestroy() { super.onDestroy(); } static void openAnImage() { m_instance.dispatchOpenGallery(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == RESULT_OK) { if(requestCode == REQUEST_OPEN_IMAGE) { String filePath = getRealPathFromURI(getApplicationContext(), data.getData()); fileSelected(filePath); } } else { fileSelected(":("); } super.onActivityResult(requestCode, resultCode, data); } private void dispatchOpenGallery() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType("image/*"); startActivityForResult(intent, REQUEST_OPEN_IMAGE); } 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(); } } } }