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How to solve Photopicker error in android Studio?

I have the following code , im receiving an error :
enter image description here
package com.example.photopicker;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.PickVisualMediaRequest;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button addimage;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addimage=findViewById(R.id.button_pick_photo);
addimage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Registers a photo picker activity launcher in single-select mode.
ActivityResultLauncher<PickVisualMediaRequest> pickMedia =
registerForActivityResult(new ActivityResultContracts.PickVisualMedia(), uri -> {
// Callback is invoked after the user selects a media item or closes the
// photo picker.
if (uri != null) {
Log.d("PhotoPicker", "Selected URI: " + uri);
} else {
Log.d("PhotoPicker", "No media selected");
}
});
// Include only one of the following calls to launch(), depending on the types
// of media that you want to allow the user to choose from.
// Launch the photo picker and allow the user to choose images and videos.
pickMedia.launch(new PickVisualMediaRequest.Builder()
**.setMediaType(new ActivityResultContracts.PickVisualMedia.ImageAndVideo())**
.build());
}
});
}
}
This code i got it from the Android developer Website :
https://developer.android.com/training/data-storage/shared/photopicker
but Doesnt seem to work , and im not able to find any online solution.

Try replacing:
new ActivityResultContracts.PickVisualMedia.ImageAndVideo()
with:
ActivityResultContracts.PickVisualMedia.Companion.getImageAndVideo()
ImageAndVideo is a Kotlin object — it is not a class that you instantiate yourself. However, the source code lacks the #JvmField annotation, so I think that just referring to ActivityResultContracts.PickVisualMedia.ImageAndVideo will fail, as outlined in the docs.

Android bugs on device. What should I do to fix them? [closed]

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In my application I noticed these three things:
-The back button is enabled when going from one activity to another enabling the user to click on back to the original activity. The problem is I don't want the user to click on Back at a certain point in my application. I don't want to disable the back button completely in my application, only when one intent is called. How can I do that?
-I noticed something strange... when a toast notification pops up in my application all is well until I exit my application. When I exit my application, some of the toast notifications are residual and are popping outside of my application. Is there a reason for that? Did I miss something in the activity lifecycle to handle the cancellation of toasts at a certain point?
Lastly, this one is rather tough to solve. How do I lock my screen so that when the user rotates the device, that the activity doesn't not get called again and the asynctask can still resume without starting over again?
Thanks a lot for your time. Just curious why these things happen and what should I look into?
Here's my code:
//Main Activity.java
package com.example.Patient_Device;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import java.io.*;
public class MainActivity extends Activity {
//fields
private ProgressDialog progressBar;
private Context context;
/**
* Called when the activity is first created.
*/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.start_setup);
//Set the context
context = this;
//Initialize the start setup button and add an onClick event listener to the button
final Button start_setup_button = (Button) findViewById(R.id.start_setup_button);
start_setup_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//Executes the AsyncTask
new RetrieveInfoTask().execute();
//Instantiates the intent to launch a new activity
Intent myIntent = new Intent(MainActivity.this, RetrieveInfoActivity.class);
MainActivity.this.startActivity(myIntent);
}
});
}
public class RetrieveInfoTask extends AsyncTask<Void, Void, Void> {
//Called on the UI thread to execute progress bar
#Override
protected void onPreExecute() {
super.onPreExecute();
progressBar = new ProgressDialog(context);
progressBar.setIndeterminate(true);
progressBar.setCancelable(false);
progressBar.setMessage(MainActivity.this.getString(R.string.retrieve_info));
progressBar.show();
}
//Methods that retrieves information from the user device. This is performed in the Background thread
private void retrieveInfo() {
try {
//Reading the drawable resource line by line
String str="";
StringBuffer buf = new StringBuffer();
InputStream is = MainActivity.this.getResources().openRawResource(R.drawable.user_info);
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
if (is!=null) {
while ((str = reader.readLine()) != null) {
buf.append(str + "\n" );
}
}
is.close();
} catch (Exception e) {
e.printStackTrace();
}
}
//doInBackground calls retrieveInfo() to perform action in Background
#Override
protected Void doInBackground(Void... params) {
retrieveInfo();
return null;
}
//When the background task is done, dismiss the progress bar
#Override
protected void onPostExecute(Void result) {
if (progressBar!=null) {
progressBar.dismiss();
}
}
}
}
//RetrieveInfoActivity.java
package com.example.Patient_Device;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
import android.os.BatteryManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
public class RetrieveInfoActivity extends Activity {
private static String TAG = "RetrieveInfoActivity";
private Context context;
String fileLastSync = "09-18-2014 03:47 PM";
#Override
public void onCreate(Bundle savedInstanceState) {
context = this;
super.onCreate(savedInstanceState);
setContentView(R.layout.retrieve_info);
//Once the new activity is launched, the setup is complete
Toast.makeText(getApplicationContext(), "Setup Complete!",
Toast.LENGTH_LONG).show();
//Gets the 'last synced' string and sets to datetime of the last sync
Resources resources = context.getResources();
String syncString = String.format(resources.getString(R.string.last_sync), fileLastSync);
//Dynamically sets the datetime of the last sync string
TextView lastSyncTextView = ((TextView) findViewById(R.id.last_sync) );
lastSyncTextView.setText(syncString);
//calls registerReceiver to receive the broadcast for the state of battery
this.registerReceiver(this.mBatInfoReceiver,new
IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}
private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context arg0, Intent intent) {
//Battery level
int level = intent.getIntExtra("level", 0);
//Dynamically sets the value of the battery level
TextView batteryTextView = ((TextView) findViewById(R.id.battery) );
batteryTextView.setText("Battery Level: " + String.valueOf(level)+ "%");
//If the battery level drops below 25%, then announce the battery is low
//TODO: Add 25 to constants file.
if(level < 25) {
Toast.makeText(getApplicationContext(), "Low Battery!",
Toast.LENGTH_LONG).show();
}
//Plugged in Status
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
//Battery Status
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
//If the device is charging or contains a full status, it's charging
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL;
//If the device isCharging and plugged in, then show that the battery is charging
if(isCharging && plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB) {
Toast.makeText(getApplicationContext(), "Charging.." + String.valueOf(level)+ "%",
Toast.LENGTH_LONG).show();
}else{
Toast.makeText(getApplicationContext(), "Unplugged!",
Toast.LENGTH_LONG).show();
}
}
};
#Override
public void onDestroy() {
try {
super.onDestroy();
unregisterReceiver(this.mBatInfoReceiver);
}
catch (Exception e) {
Log.e(RetrieveInfoctivity.TAG, getClass() + " Releasing receivers-" + e.getMessage());
}
}
}
//StartSetupActivity.java
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class StartSetupActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
}
//FragmentsActivity.java
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FragmentsActivity extends Fragment{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.main, container, false);
}
}

First of all whenever you want to disable back press just override onBackPressed() method and remove super. like this:
#Override
public void onBackPressed() {
//super.onBackPressed();
}
Second you'r using application context to show toast. use activity context.
Toast.makeText(this or YourActivity.this, "Setup Complete!", Toast.LENGTH_LONG).show();
Third just add this attribute into your manifest class. This will avoid recrating your activity when orientation change
android:configChanges="orientation"

I'll answer these in order:
Back Button
You can override onBackPressed in your Activity and determine if you want to consume it or let Android process it.
#Override
public void onBackPressed()
{
// Set this how you want based on your app logic
boolean disallowBackPressed = false;
if (!disallowBackPressed)
{
super.onBackPressed();
}
}
Toasts
Toasts are enqueued with the Notification Manager. If you show multiple Toasts in a row, they get queued up and shown one at a time until the queue is empty.
Locking Orientation For Activity
Use android:screenOrientation="landscape" or android:screenOrientation="portrait" on your activity element in your manifest to lock the orientation.

I think that these questions should be asked separately, because the answer in detail to every item of your question is too long, but I hope this helps:
-The back button is enabled when going from one activity to another enabling the user to click on back to the original activity. The
problem is I don't want the user to click on Back at a certain point
in my application. I don't want to disable the back button completely
in my application, only when one intent is called. How can I do that?
You can override the onBackPressed on the activities you don't want the user to go back.
#Override
public void onBackPressed() {
//Leave it blank so it doesn't do anything
}
-I noticed something strange... when a toast notification pops up in my application all is well until I exit my application. When I exit my
application, some of the toast notifications are residual and are
popping outside of my application. Is there a reason for that? Did I
miss something in the activity lifecycle to handle the cancellation of
toasts at a certain point?
I think that the reason behind that is that toast go into a que, and are showed in order, even if the app is no longer visible.
Lastly, this one is rather tough to solve. How do I lock my screen so
that when the user rotates the device, that the activity doesn't not
get called again and the asynctask can still resume without starting
over again?
For this, you can use the following code in your manifest
android:configChanges="orientation|screenSize"/>
However this is NOT recommended by google, I suggest you read the following link to get a little more information on how to handle orientation changes:
http://developer.android.com/guide/topics/resources/runtime-changes.html

Issue in changing orientation in android

Just making a test application that should display a log message on changing orientation, but when i change orientation using ctrl + f11, there is nothing shown in the logcat.
what is the issue in the coding
A Part From Manifest
<activity
android:name="com.example.orientationtest.MainActivity"
android:label="#string/app_name"
android:configChanges="orientation|screenSize" >
A part from Java
package com.example.orientationtest;
import android.os.Bundle;
import android.app.Activity;
import android.content.res.Configuration;
import android.util.Log;
import android.view.Menu;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
Log.d("error", " orientation changes");
}
}

try this if target api 13 and above
android:configChanges="orientation|keyboardHidden|screenLayout|screenSize"
or
android:configChanges="orientation|keyboardHidden|screenLayout"
for lower than 13 ..... this will help you... :)

Using configChanges is not a good idea if you only want to know if the screen rotated. It basically means that you plan to handle the whole rotation change by yourself in the code.
If you don't plan to do this, just check what is the current rotation when your Activity is created:
int currentOrientation = getResources().getConfiguration().orientation;
Then just do whatever you want using this check:
if(currentOrientation == Configuration.ORIENTATION_LANDSCAPE){
//if landscape
} else {
//if portrait
}
This way you don't need to touch your manifest file and you let your app manage the configuration changes by itself.
You can keep the previous orientation used in the activity saved instance if you need to compare the previous and the current one.

The issue is that you prevented the android from changing its orientation
android:configChanges="orientation|screenSize"
that line of code is preventing it to configuration change and that why your not getting any response..

Updating a TextView value every 3 seconds

I am a PHP developer, who is new to Android development and Java so please bear with me.
I am developing an extremely simple app for testing and learning purposes.
when the user clicks my app icon, they are presented with a loading screen. I have a TextView with a progress bar underneath.
TextView XML code:
<TextView
android:id="#+id/loadingMessage1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/progressBar1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="22dp"
android:text="#string/loading1" />
The value is set to the string loading1 in strings.xml
<string name="loading1">Loading Message 1</string>
In my loadingscreen.java i have:
package com.example.myfirstapp;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;
public class LoadingScreen extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_loading_screen);
TextView loadingMessage1 = (TextView)this.findViewById(R.id.loadingMessage1);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_loading_screen, menu);
return true;
}
}
Notice I have the code:
TextView loadingMessage1 = (TextView)this.findViewById(R.id.loadingMessage1);
Which I think references the text view.
What I want to happen is that every 3 seconds a different message appears.
So loading message 1... (3 secs) loading message 2... (3 secs) loading message 3..
after loading message 3 i would like a button to replace the progress bar.

You can use the Handler class:
final Handler handler = new Handler();
handler.post(new Runnable(){
#Override
public void run(){
// change your text here
handler.postDelayed(this, 3*1000L);
}
});

You might need to use a timer, which executes every 1 second period.. Read this brilliant android dev blog article on periodic execution using timer and Handler.

Basic Android Eclipse Development Errors

(Solved) Thanks to NetCat: it was a UI XML problem :)
Today I have started Android development, i'm using a Mac with Eclipse and the Android SDK install and all working (I have successfully managed to get working a few "Hello World" type apps working) and for the Android device i'm using my new HTC Incredible S.
So the code below should work and their are no error is the debugger when I run it on my phone, but each time I do before it even loads, the phone pops up a message saying "The application Count (process com.count) has stopped unexpectedly. Please try agin."
I have re created the project several times with different SDK versions 1.5 and 2.2 but still no luck.
The code is from another tutorial I successfully worked through but i have changed some of the variables to make a slightly different app. Can you tell me what is wrong with the following code:
package com.count;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class count extends Activity implements OnClickListener {
//Declare widgets
Button btnSave, btnUp, btnDown;
TextView lblCurrentCount, lblCountCard;
//Declare variables
int intCount=0;
int intCardCount=0;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Sets up the link between java and the XML widgets
btnSave = (Button)findViewById(R.id.btnSave);
btnUp = (Button)findViewById(R.id.btnUp);
btnDown = (Button)findViewById(R.id.btnDown);
lblCurrentCount = (TextView)findViewById(R.id.lblCurrentCount);
lblCountCard = (TextView)findViewById(R.id.lblCountCard);
//Initialize widgets
lblCurrentCount.setText(String.valueOf(intCount));
lblCountCard.setText("");
//Define button listeners
btnSave.setOnClickListener(this);
btnUp.setOnClickListener(this);
btnDown.setOnClickListener(this);
}
//When any button is clicked
#Override
public void onClick(View src) {
//Actions when buttons are clicked
switch(src.getId()) {
case R.id.btnSave:
lblCountCard.append("\n#" + intCardCount + " " + intCount);
intCardCount++;
intCount=0;
lblCountCard.setText(String.valueOf(intCount));
break;
case R.id.btnUp:
intCount++;
lblCountCard.setText(String.valueOf(intCount));
break;
case R.id.btnDown:
intCount--;
lblCountCard.setText(String.valueOf(intCount));
break;
}
}
}
Thanks Dave

You must supply a layout_width
attribute.
That's probably it. You've got a layout element without a layout_width (and probably, if you make the same kinds of mistakes I do, a layout_height) attribute. Find it, add the attributes, and see what comes next.