Here is a class to handle file input in android.
here is the base sketch;
Summary
import android.app.Activity;
import android.content.Intent;
import processing.core.PApplet;
import android.os.Bundle;
import android.os.Environment;
import android.content.Context;
import android.provider.MediaStore;
import android.net.Uri;
import android.graphics.BitmapFactory;
import android.database.Cursor;
import android.os.Build.VERSION_CODES;
import android.os.Build;
import android.graphics.Bitmap;
fileInput f;
void setup() {
f = new fileInput(this);
//set image to true for images
//set folder to true for directory picker please make sure you install a file browser on android
f.folder = true;
};
void draw() {
f.displayImage();
};
void mousePressed() {
f.getItem();
};
//@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
f.handleActivity(requestCode,resultCode,data);
};
Summary
class fileInput extends PApplet {
PApplet p;
boolean folder, file, imageLoaded, image, audio, video, getPermission = true;
String location, folderPath, fileName, absolutePath, fileContent, ext;
PImage img;
Activity act;
Context context;
Permission wStorage;
ArrayList<String>Files = new ArrayList<String>();
ArrayList<String>images = new ArrayList<String>();
ArrayList<String>audioFiles = new ArrayList<String>();
ArrayList<String>textFiles = new ArrayList<String>();
ArrayList<String>videoFiles = new ArrayList<String>();
ArrayList<String>otherFiles = new ArrayList<String>();
fileInput(PApplet app) {
p = app;
init();
};
void init() {
wStorage = new Permission(p, "WRITE_EXTERNAL_STORAGE");
absolutePath = Environment.getExternalStorageDirectory().getAbsolutePath();
getPermission = false;
act = p.getActivity();
context = act.getApplicationContext();
};
void getItem() {
openImageExplorer();
getFolder();
getFile();
};
public void openImageExplorer() {
if (image) {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType("image/*");
act.startActivityForResult(intent, 1);
};
};
void getFolder() {
if (folder) {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
act.startActivityForResult(intent, 9999);
}
}
};
void getFile() {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
Intent chooseFile;
Intent intent;
chooseFile = new Intent(Intent.ACTION_GET_CONTENT);
chooseFile.setType("file/*");
intent = Intent.createChooser(chooseFile, "Choose a file");
act.startActivityForResult(intent, 9999);
}
};
void handleActivity(int requestCode, int resultCode, Intent data) {
activityResult(requestCode, resultCode, data);
activityResultImage(requestCode, resultCode, data);
onActivityResultFile(requestCode, resultCode, data);
};
public void activityResult(int requestCode, int resultCode, Intent data) {
if (folder) {
onActivityResult(requestCode, resultCode, data);
switch(requestCode) {
case 9999:
String s1 = data.getData().toString();
int i = s1.indexOf("primary%");
s1 = s1.substring(i+10, s1.length());
s1 = absolutePath +"/"+s1;
s1 = s1.replace("%2F", "/");
println("Test", "path" + s1);
listFiles(s1);
break;
}
}
};
public void activityResultImage(int requestCode, int resultCode, Intent data) {
if (image) {
onActivityResult(requestCode, resultCode, data);
if (requestCode == 1) {
if (resultCode == -1) {
if (data != null) {
Uri image_uri = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(image_uri, filePathColumn, null, null, null);
cursor.moveToFirst();
int var7 = cursor.getColumnIndex(filePathColumn[0]);
String imgDecodableString = cursor.getString(var7);
cursor.close();
PApplet.println(imgDecodableString);
if (Build.VERSION.SDK_INT >= 28) {
try {
InputStream ips = context.getContentResolver().openInputStream(image_uri);
Bitmap bitmap = BitmapFactory.decodeStream(ips);
img = new PImage(bitmap.getWidth(), bitmap.getHeight(), 2);
bitmap.getPixels(img.pixels, 0, img.width, 0, 0, img.width, img.height);
img.updatePixels();
imageLoaded = true;
PApplet.println("success", img.width, img.height);
}
catch (Exception e) {
e.printStackTrace();
}
} else {
img = p.loadImage(imgDecodableString);
imageLoaded = true;
PApplet.println("success", img.width, img.height);
}
} else {
PApplet.println("No data");
}
}
}
}
};
public void onActivityResultFile(int requestCode, int resultCode, Intent data) {
if (file&&!image&&!audio&&!video) {
onActivityResult(requestCode, resultCode, data);
switch(requestCode) {
case 9999:
String s1 = data.getData().toString();
int i = s1.indexOf("external_files");
s1 = s1.substring(i+15, s1.length());
s1 = absolutePath +"/"+s1;
s1 = s1.replace("%2F", "/");
setLocation(s1);
loadFile(s1);
println("Test", "path " + s1);
break;
}
}
};
String[] listFiles(String s1) {
String []s = null;
String path = s1;
println("Files", "Path: " + path);
File directory = new File(path);
File[] files = directory.listFiles();
if (files!=null) {
s = new String [files.length];
println("Files", "Size: "+ files.length);
for (int i = 0; i < files.length; i++)
{
s[i] = files[i].getName();
Files.add(s[i]);
filterAll(s[i]);
println("Files", "FileName: " + files[i].getName());
}
}
println("Images", images.size());
println("text", textFiles.size());
println("Audio", audioFiles.size());
println("Other", otherFiles.size());
return s;
};
void filterAll(String s) {
filterImage(s);
filterText(s);
filterAudio(s);
filterVideo(s);
filterOthers(s);
};
void filterImage(String s) {
if (s.contains("jpg")
||s.contains("JPG")
||s.contains("bmp")
||s.contains("BMP")
||s.contains("png")
||s.contains("PNG")
||s.contains("gif")
||s.contains("GIF")) {
if (!images.contains(s))images.add(s);
}
};
void filterText(String s) {
if (s.contains("txt")
||s.contains("doc")
||s.contains("docx")
||s.contains("csv")) {
if (!textFiles.contains(s))textFiles.add(s);
}
};
void filterAudio(String s) {
if (s.contains("ogg")
||s.contains("mp3")
||s.contains("wav")) {
if (!audioFiles.contains(s))audioFiles.add(s);
}
};
void filterVideo(String s) {
if (s.contains("mp4")
||s.contains("wmv")
||s.contains("avi")
||s.contains("mkv")) {
if (!videoFiles.contains(s))videoFiles.add(s);
}
};
void filterOthers(String s) {
if (!images.contains(s)
&&!textFiles.contains(s)
&&!videoFiles.contains(s)
&&!audioFiles.contains(s)) {
if (!otherFiles.contains(s))otherFiles.add(s);
}
};
String loadFile(String s) {
println("test Location",location);
FileInputStream fis = null;
try {
fis = new FileInputStream (new File(s));
println("try reading file");
InputStreamReader isr = new InputStreamReader(fis);
// READ STRING OF UNKNOWN LENGTH
StringBuilder sb = new StringBuilder();
char[] inputBuffer = new char[2048];
int l;
// FILL BUFFER WITH DATA
while ((l = isr.read(inputBuffer)) != -1) {
sb.append(inputBuffer, 0, l);
println("write data", inputBuffer, 0, l);
}
// CONVERT BYTES TO STRING
fileContent = sb.toString();
println("file",fileName+"."+ext,fileContent);
fis.close();
}
catch (Exception e) {
println("cannot fetch file", e);
}
finally {
if (fis != null) {
fis = null;
}
}
return fileContent;
};
void setLocation(String s) {
location = s;
folderPath = s.substring(0, s.lastIndexOf("/"));
fileName = s.replace(folderPath+"/", "");
getExt(fileName);
PApplet.println("Fname", folderPath);
PApplet.println("fileName", fileName);
PApplet.println("ext", ext);
init();
}
void getExt(String location) {
int count = 0;
fileName = location.substring(0, location.indexOf("."));
ext = location.replace(fileName, "");
ext = ext.replace(".", "");
ext = ext.replace(fileName, "");
};
void displayImage() {
if (imageLoaded) {
p.image(img, 0, 0);
}
};
void displayImage(int x, int y) {
if (imageLoaded) {
p.image(img, x, y);
}
};
void displayImage(PGraphics p, int x, int y) {
if (imageLoaded) {
p.image(img, x, y);
}
};
void readContents() {
if (f.fileContent!=null) {
p.fill(255,0,0);
p.text(f.fileContent, 20, 40);
} else {
p.fill(0,255,0);
p.text("no file", 20, 20);
}
};
};
permission class
Summary
public class Permission{
PApplet parent;
String p;
public Permission(PApplet pParent,String permissionName) {
parent = pParent;
p = permissionName;
parent.requestPermission("android.permission."+permissionName, "onPermissionResult", this);
};
public void onPermissionResult(boolean granted) {
if (!granted) {
PApplet.println("User did not grant", p ,"permission.", p ,"is disabled.");
}
};
};
if folder is selected, once you allow android access to your folder it will dump the names of the files into its respective folders.
ArrayList<String>Files = new ArrayList<String>();
ArrayList<String>images = new ArrayList<String>();
ArrayList<String>audioFiles = new ArrayList<String>();
ArrayList<String>textFiles = new ArrayList<String>();
ArrayList<String>videoFiles = new ArrayList<String>();
ArrayList<String>otherFiles = new ArrayList<String>();
if image is set to true when you pick an image it will automatically be loaded into its local variable img for easy reading, same with textFiles with the contents being loaded into fileContents.
I’ll update with into my lib later. Now we can fully access android files and folders on android without much hastle.