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Restrict selecting file above some size in Android Studio

I a beginner in android, I want to select an image or a video file. But I want to restrict the selected file size, let's assume the restriction size is 5MB. Above 5MB I want to not allow the user to select the file.
How can I do it?
Any help would be appreciated.
Button OnClick:
btnSelectFile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT);
galleryIntent.setType("*/*");
startActivityForResult(galleryIntent, 21);
}
});
OnActivityResult:
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 21 && resultCode == RESULT_OK) {
// Get the Uri of the selected file
uri = data.getData();
uriString = uri.toString();
myFile = new File(uriString);
path = myFile.getAbsolutePath();
displayName = null;
if (uriString.startsWith("content://")) {
Cursor cursor = null;
try {
cursor = getActivity().getContentResolver().query(uri, null, null, null, null);
if (cursor != null && cursor.moveToFirst()) {
displayName = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
int sizeIndex = cursor.getColumnIndex(OpenableColumns.SIZE);
Log.e("TAG","Size: "+Long.toString(cursor.getLong(sizeIndex)));
textFileSelected.setText(displayName);
fileName = textFileSelected.getText().toString();
Toast.makeText(this, "File Selected: " + fileName, Toast.LENGTH_SHORT).show();
}
} finally {
cursor.close();
}
} else if (uriString.startsWith("file://")) {
displayName = myFile.getName();
textFileSelected.setText(displayName);
fileName = textFileSelected.getText().toString();
Toast.makeText(this, "File Selected: " + fileName, Toast.LENGTH_SHORT).show();
}
}
}

How to get the image name when user upload the image from gallery and display them in textView?

I'm trying to retrieve the actual image name of the image selected by user in gallery(Ex. IMG_2020).
I tried using getAbsolutePath() and getName() but these 2 methods display something like "image$3A75" instead of the actual image file name.
Other than that, I also tried using some cursor method which I don't know really how it works, but it still doesn't work or maybe it's because I do not know how to use it.
Any help please?
This is my onActivityResult() method
fileName is the textView I want to place my imageName
bitMap object is not used yet because I'm following a tutorial online and I'm halfway copying, I think it will be used later in the tutorial
public class createCharity extends AppCompatActivity {
private static final int PICK_IMAGE_REQUEST = 1;
Button uploadButton;
Button createCharityButton;
TextView charityTitle;
TextView fileName;
TextView charityDescription;
Uri charityImage;
private StorageReference mStorageRef;
private DatabaseReference mDatabaseRef;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_charity);
uploadButton = findViewById(R.id.uploadButton);
charityTitle = findViewById(R.id.charityTitle);
fileName = findViewById(R.id.fileName);
charityDescription = findViewById(R.id.charityDescription);
createCharityButton = findViewById(R.id.createCharityButton);
mStorageRef = FirebaseStorage.getInstance().getReference("charityUploads");
mDatabaseRef = FirebaseDatabase.getInstance().getReference("charityUploads");
uploadButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openFileChooser();
}
});
}
private void openFileChooser() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, PICK_IMAGE_REQUEST);
System.out.println("----------------------c1");
}
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
charityImage = data.getData();
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), charityImage);
File file = new File(String.valueOf(charityImage));
System.out.println("Image name: " + file.getName());
fileName.setText(file.getName());
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

Something like:
String projection [] = {
MediaStore.Images.Media.DATA
, MediaStore.Images.Media.DISPLAY_NAME
, MediaStore.Images.Media.SIZE};
Cursor cursor = getContentResolver().query(data.getData(), projection, null, null, null);
if ( cursor==null)
{
Toast.makeText(context, "cursor==null\n\ncould not query content resolver for\n\n" + path, Toast.LENGTH_LONG).show();
return;
}
cursor.moveToFirst();
String data = cursor.getString(0);
String displayName = cursor.getString(1);
String size = cursor.getString(2);
Toast.makeText(context, "getContentResolver().openInputStream() ok\n\n" + path
+ "\n\nDISPLAY_NAME: " + displayName
+ "\nDATA: " + data
+ "\nSIZE: " + size
, Toast.LENGTH_LONG).show();
cursor.close();
DATA not available on Android Q+.

For what this Android code is used?

I'm new on Android development, can you please explain me the following code and for what this Android code is it used?
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
try {
if (requestCode == RESULT_LOAD_IMG && resultCode == getActivity().RESULT_OK
&& null != data) {
selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
// Get the cursor
Cursor cursor = getActivity().getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
// Move to first row
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
imgPath = cursor.getString(columnIndex);
cursor.close();
String fileNameSegments[] = imgPath.split("/");
fileName = fileNameSegments[fileNameSegments.length - 1];
_txt_img_url.setText(fileName);
Toast.makeText(getActivity(), fileName, Toast.LENGTH_SHORT).show();
ImageTask imgtask = new ImageTask();
imgtask.execute();

onActivityResult method is used to handle the data returned from an intent,
check here the documentation
https://developer.android.com/training/basics/intents/result.html
In short in this case if the result is ok, and we have data to handle, a toast appear with the path of the selected file.

Unable to read data from contact picker

I am unable to read and handle the data of contact from my activity.
By executing my code , it displays a contact picker but when i select a contact it shows a dialog box as "Unfortunately YourApp has been stopped".
I am able to choose the contact but can't read the data as phone number,name etc.
I am quite sure that there is some mistake in onActivityResult() method
The code in onActivityResult() method is:-
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
if (requestCode == 1) {
if (resultCode == RESULT_OK) {
contact=data.getData();
String projection[]={Phone.NUMBER};
Cursor c=getContentResolver().query(contact, projection, null, null, null);
c.moveToFirst();
int column=c.getColumnIndex(Phone.NUMBER);
String number=c.getString(column);
Toast.makeText(this,"The number of selected contact is:-"+ number, Toast.LENGTH_LONG).show();
}
}
Please help me.
I am new to android programming.
Thanks in advance.

I think your onActivityResult should be like below
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) {
if (resultCode == RESULT_OK) {
Uri result = data.getData();
String id = result.getLastPathSegment();
String projection[] = { Phone.NUMBER };
Cursor c = getContentResolver().query(Phone.CONTENT_URI, projection,
Phone.CONTACT_ID + "=?", new String[] { id }, null);
c.moveToFirst();
int column = c.getColumnIndex(Phone.NUMBER);
String number = c.getString(column);
Toast.makeText(this,
"The number of selected contact is:-" + number,
Toast.LENGTH_LONG).show();
}
}
}

Android: Open fileBrowser to get file path

I have been trying to figure out a way for my application to open a file browser where the user can select a video File and have my app store that path into a string to use later. Is there an Intent I can use or function? Any suggestions?

You can do it via intent chooser. Try this code i think this solution solve your purpose.
Intent intent = new Intent();
intent.addCategory(Intent.CATEGORY_OPENABLE);
// Set your required file type
intent.setType("*/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "DEMO"),1001);
then onActivityResult method.
public void onActivityResult(int requestCode, int resultCode,
Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
// super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1001) {
Uri currFileURI = data.getData();
String path=currFileURI.getPath();
}}

Here is a code I have used one of my previous projects.
Intent intent = new Intent();
intent.setType("video/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,"Select Video "), 33);
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == 33) {
Uri selectedMediaUri = data.getData();
filemanagerstring = selectedMediaUri.getPath();
selectedMediaPath = getPath(selectedMediaUri);
if (!selectedMediaPath.equals("")) {
filePath = selectedMediaPath;
} else if (!filemanagerstring.equals("")) {
filePath = filemanagerstring;
}
int lastIndex = filePath.lastIndexOf("/");
fileName = filePath.substring(lastIndex+1);
//filepath is your file's path
}
}
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.MediaColumns.DATA };
Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
if (cursor != null) {
// HERE YOU WILL GET A NULLPOINTER IF CURSOR IS NULL
// THIS CAN BE, IF YOU USED OI FILE MANAGER FOR PICKING THE MEDIA
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
} else
return "";
}

use below code.
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("file/*");
startActivityForResult(intent,PICKFILE_RESULT_CODE);
and on activity result you get file path.
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
switch(requestCode){
case PICKFILE_RESULT_CODE:
if(resultCode==RESULT_OK){
String FilePath = data.getData().getPath();
textFile.setText(FilePath);
}
break;
}
}