add a media ContentProvider

Every time the ContentProvider is accessed, a file chooser opens and the
selected file is then provided as media file.

src/api-impl/android/content/ATLMediaContentProvider.java

@@ -0,0 +1,145 @@
+package android.content;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.file.Files;
+
+import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.net.Uri;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.ParcelFileDescriptor;
+
+public class ATLMediaContentProvider extends ContentProvider {
+
+	boolean waitingForFileChooser = false;
+	File selectedFile = null;
+	long timestamp = 0;
+
+	// called from native
+	void setSelectedFile(String selectedFile) {
+		this.selectedFile = new File(selectedFile);
+		this.waitingForFileChooser = false;
+		this.timestamp = System.currentTimeMillis();
+		synchronized(this) {
+			notifyAll();
+		}
+	}
+
+	private void openFileChooser() {
+		if (!waitingForFileChooser) {
+			waitingForFileChooser = true;
+			new Handler(Looper.getMainLooper()).post(new Runnable() {
+				@Override
+				public void run() {
+					native_open_media_folder();
+				}
+			});
+		}
+		synchronized(this) {
+			try {
+				while (waitingForFileChooser) {
+					wait();
+				}
+			} catch (InterruptedException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	@Override
+	public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
+		// if we haven't selected a file, open the file chooser
+		if (!"0".equals(uri.getLastPathSegment()) && timestamp + 1000 < System.currentTimeMillis()) {
+			openFileChooser();
+		}
+		MatrixCursor cursor = new MatrixCursor(projection);
+		Object[] row = new Object[projection.length];
+		if (uri.getQueryParameter("distinct") != null) {
+			for (int i = 0; i < projection.length; i++) {
+				switch (projection[i]) {
+				case "bucket_display_name":
+					row[i] = "files";
+					break;
+				case "bucket_id":
+					row[i] = 0;
+					break;
+				}
+			}
+		} else {
+			for (int i = 0; i < projection.length; i++) {
+				switch (projection[i]) {
+					case "_id":
+						row[i] = 0;
+						break;
+					case "_data":
+					case "title":
+						row[i] = selectedFile;
+						break;
+					case "mime_type":
+						row[i] = getType(uri);
+						break;
+					case "media_type":
+						if (getType(uri).startsWith("image/"))
+							row[i] = 1;
+						else if (getType(uri).startsWith("audio/"))
+							row[i] = 2;
+						else if (getType(uri).startsWith("video/"))
+							row[i] = 3;
+						else
+							row[i] = 0;
+						break;
+					case "date_modified":
+					case "datetaken":
+						row[i] = selectedFile.lastModified();
+						break;
+					case "orientation":
+						row[i] = 0;
+						break;
+					case "_size":
+						row[i] = selectedFile.length();
+						break;
+				}
+			}
+		}
+		cursor.addRow(row);
+		return cursor;
+	}
+
+	@Override
+	public String getType(Uri uri) {
+		try {
+			return Files.probeContentType(selectedFile.toPath());
+		} catch (IOException e) {
+			e.printStackTrace();
+			return "application/octet-stream";
+		}
+	}
+
+	@Override
+	public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
+		return ParcelFileDescriptor.open(selectedFile, ParcelFileDescriptor.parseMode(mode));
+	}
+
+	@Override
+	public Uri insert(Uri uri, ContentValues values) {
+		// TODO Auto-generated method stub
+		throw new UnsupportedOperationException("Unimplemented method 'insert'");
+	}
+
+	@Override
+	public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+		// TODO Auto-generated method stub
+		throw new UnsupportedOperationException("Unimplemented method 'update'");
+	}
+
+	@Override
+	public int delete(Uri uri, String selection, String[] selectionArgs) {
+		// TODO Auto-generated method stub
+		throw new UnsupportedOperationException("Unimplemented method 'delete'");
+	}
+
+	private native void native_open_media_folder();
+}

src/api-impl/android/content/ContentProvider.java

@@ -34,6 +34,7 @@ public abstract class ContentProvider {
 				providers.put(provider_parsed.info.authority, provider);
 			} catch(Exception e) { e.printStackTrace(); }
 		}
+		providers.put("media", new ATLMediaContentProvider());
 	}
 
 	public boolean onCreate() {return false;}