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how to assign the value of a progressbar in another outerclass variable to perform calculation?

so i have been trying to make this BMI calculator in android studio, where your BMI will instantly get calculated when you drag Progress-bar to any value .
To execute this, what i did was-
inside the the Bundle class,
i directly declared 2 variable and assigned one of them to get the data from the Height progress bar and another to get the data from weight progress bar.
and then i wrote the typical code for the calculation and the text setting.
And it did not work
For myself being a very new to this, i really cant find my mistake here.
so as a result what i got was- a still BMI which was the result for the initial value of the progress-bar that i have set for the height and weight.
i am getting a feeling that i made a very silly mistake somewhere that i still can not notice.
Would you be kind enough to point that out?
the Java code that i have used is below, please check it-
The code for the BMI is at the end. I feel the problem is lying there.
here is the screenshot of the app-
screenshot2
screenshot1
here is my code--
public class MainActivity extends AppCompatActivity {
TextView mheighttext,mweighttext2,mbmitext,mfunnymsg;
SeekBar mbar1, mbar2;
RelativeLayout mweightlayout, mlayout3;
ImageView mgincbtn1,mgincbtn2,mgdecbtn1,mgdecbtn2;
String mbmi, bmitext;
int wt= 45;
String wtwt="45";
int ht= 158;
String htht="158";
float rslt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mheighttext=findViewById(R.id.heighttext);
mweighttext2=findViewById(R.id.weighttext2);
mbar1= findViewById(R.id.bar1);
mbar2=findViewById(R.id.bar2);
mgincbtn1=findViewById(R.id.gincbtn1);
mgincbtn2=findViewById(R.id.gincbtn2);
mgdecbtn1=findViewById(R.id.gdecbtn1);
mgdecbtn2=findViewById(R.id.gdecbtn2);
mbmitext=findViewById(R.id.bmitext1);
mfunnymsg=findViewById(R.id.funnymsg);
mbar1.setMax(246);
mbar1.setProgress(160);
mbar1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
ht=progress;
htht=String.valueOf(ht);
mheighttext.setText(htht);
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
mbar2.setMax(244);
mbar2.setProgress(50);
mbar2.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
wt=progress;
wtwt=String.valueOf(wt);
mweighttext2.setText(wtwt);
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
mgincbtn1.setOnClickListener(v -> {
ht=ht+1;
if (ht>=0 && ht<247) {
mbar1.setProgress(ht);
htht = String.valueOf(ht);
mheighttext.setText(htht);
}
});
mgdecbtn1.setOnClickListener(v -> {
ht=ht-1;
if (ht>=0 && ht<247) {
mbar1.setProgress(ht);
htht = String.valueOf(ht);
mheighttext.setText(htht);
}
});
mgincbtn2.setOnClickListener(view -> {
wt=wt+1;
if (wt>=0 && wt<244) {
mbar2.setProgress(wt);
wtwt = String.valueOf(wt);
mweighttext2.setText(wtwt);
}
});
mgdecbtn2.setOnClickListener(v -> {
wt=wt-1;
if (wt>=0 && wt<244) {
mbar2.setProgress(wt);
wtwt = String.valueOf(wt);
mweighttext2.setText(wtwt);
}
});
int htt = mbar1.getProgress();
int wtt = mbar2.getProgress();
float httt=htt/100;
rslt= wtt/(httt*httt);
mbmi=Float.toString(rslt);
mbmitext.setText(mbmi);
}
}
}

You would want to put the snippet of code that calculates the BMI (perhaps the last 4 lines of code) in both onProgressChanged() to instantly calculate BMI as height/weight gets changed. Since you're setting global variables for both height and weight, you'll get current values for each of them.
You can also make a function for calculating the BMI like this:
private float calculateBMI(int height, int weight) {
float ht = height / 100;
float result = weight / (ht * ht);
return result;
}
and have this function call in both onProgressChanged() like so (for the weight for example):
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
wt = progress;
mweighttext2.setText(String.valueOf(getBMI(ht, progress)));
}

Move this your code...
int htt = mbar1.getProgress();
int wtt = mbar2.getProgress();
float httt=htt/100;
rslt= wtt/(httt*httt);
mbmi=Float.toString(rslt);
mbmitext.setText(mbmi);
to a method say
public void computeBMI(){
int htt = mbar1.getProgress();
int wtt = mbar2.getProgress();
float httt=htt/100;
rslt= wtt/(httt*httt);
mbmi=Float.toString(rslt);
mbmitext.setText(mbmi);
}
Then add a button in your UI say mCompute. In your oncreate method you can then implement that buttons onClickListener to call computeBMI() above.
That is:
yourButton.setOnclickListener((v)->{
computeBMI();
});

Set color seekbar

I'm creating a small paint android app using android studio java. I create in the menu an icon for changing the color of the drawing. Once the user click on it a new AlertDialog should appear showing 4 seekbars for ARGB colors. I ended with this code but I still don't know why it's not working. Can someone please help me?
private Drawing draws;
private SeekBar alphaSeekBar;
private SeekBar redSeekBar;
private SeekBar greenSeekBar;
private SeekBar blueSeekBar;
private void showColorDialog(){
currentAlertDialog = new AlertDialog.Builder(this);
View view = getLayoutInflater().inflate(R.layout.color_dialog, null);
alphaSeekBar = view.findViewById(R.id.alphaSeekBar);
redSeekBar = view.findViewById(R.id.redSeekBar);
greenSeekBar = view.findViewById(R.id.greenSeekBar);
blueSeekBar = view.findViewById(R.id.blueSeekBar);
colorView = view.findViewById(R.id.colorView);
alphaSeekBar.setOnSeekBarChangeListener(colorSeekBarChanged);
redSeekBar.setOnSeekBarChangeListener(colorSeekBarChanged);
greenSeekBar.setOnSeekBarChangeListener(colorSeekBarChanged);
blueSeekBar.setOnSeekBarChangeListener(colorSeekBarChanged);
int color = draws.getDrawingColor();
alphaSeekBar.setProgress(Color.alpha(color));
redSeekBar.setProgress(Color.red(color));
greenSeekBar.setProgress(Color.green(color));
blueSeekBar.setProgress(Color.blue(color));
Button setColorButton = view.findViewById(R.id.setColorButton);
setColorButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
pikassoView.setDrawingColor(Color.argb(
alphaSeekBar.getProgress(),
redSeekBar.getProgress(),
greenSeekBar.getProgress(),
blueSeekBar.getProgress()
));
colorDialog.dismiss();
}
});
currentAlertDialog.setView(view);
currentAlertDialog.setTitle("Choose color");
colorDialog = currentAlertDialog.create();
colorDialog.show();
} private SeekBar.OnSeekBarChangeListener colorSeekBarChanged = new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
draws.setBackgroundColor(Color.argb(
alphaSeekBar.getProgress(),
redSeekBar.getProgress(),
greenSeekBar.getProgress(),
blueSeekBar.getProgress()
));
colorView.setBackgroundColor(Color.argb(
alphaSeekBar.getProgress(),
redSeekBar.getProgress(),
greenSeekBar.getProgress(),
blueSeekBar.getProgress()
));
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
};

First, this alphaSeekBar.setProgress(Color.alpha(color)); is wrong. setProgress is meant for setting int value to show how much progress seekbar has.
If your seekBar Max is set to 100 (alphaSeekBar.setMax(100);) then this alphaSeekBar.setProgress(50); means seekBar is progressed half way.
Second, to set colors use this:
alphaSeekBar.setProgressTintList(Color.alpha(color));
alphaSeekBar.setThumbTintList(Color.alpha(color));
Or, use this:
alphaSeekBar.getProgressDrawable().setColorFilter(Color.alpha(color), PorterDuff.Mode.MULTIPLY);
try different tint modes in place of PorterDuff.Mode.MULTIPLY to get your desired result
good luck
EDIT:
For setting a custom view to Alert Dialog
currentAlertDialog = new AlertDialog.Builder(this);
// ...Irrelevant code for customizing the buttons and title
View view = getLayoutInflater().inflate(R.layout.color_dialog, null);
currentAlertDialog.setView(view);
then you can get those seekbar references like below:
alphaSeekBar = currentAlertDialog.findViewById(R.id.alphaSeekBar);
redSeekBar = currentAlertDialog.findViewById(R.id.redSeekBar);
greenSeekBar = currentAlertDialog.findViewById(R.id.greenSeekBar);
blueSeekBar = currentAlertDialog.findViewById(R.id.blueSeekBar);
colorView = currentAlertDialog.findViewById(R.id.colorView);

How to change font size of an app in android studio using seekbar

I'm trying to change the font of the overall app by using a seekbar in the settings activity that I've created. Below is what I have gotten from online so far, but it changes only the small amount of text with the ID "changeFont":
// Fonts Scale Slider
fontScaleSlider = findViewById(R.id.fontScaleSlider);
view = findViewById(R.id.changeFont);
prefs = getPreferences(MODE_PRIVATE);
float fs = prefs.getFloat("fontsize", 10);
fontScaleSlider.setProgress((int)fs);
view.setTextSize(fontScaleSlider.getProgress());
fontScaleSlider.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onStopTrackingTouch(SeekBar fontScaleSlider){
prefs = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor ed = prefs.edit();
ed.putFloat("fontsize", view.getTextSize());
ed.commit();
}
#Override
public void onStartTrackingTouch(SeekBar fontScaleSlider) {
}
#Override
public void onProgressChanged(SeekBar fontScaleSlider, int progress,
boolean fromUser){
view.setTextSize(progress);
// Set text size of the whole app here
}
And the XML file:
<SeekBar
android:id="#+id/fontScaleSlider"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="13dp"
android:layout_marginEnd="13dp"
android:layout_marginBottom="82dp"
android:max="30"
app:layout_constraintBottom_toTopOf="#+id/logInButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/fontSliderLabel" />

In the implemented method onProgressChanged you can save the seek bar value to the shared preferences.
#Override
public void onProgressChanged(SeekBar fontScaleSlider, int progress,boolean fromUser){
SharedPreferences.Editor ed = prefs.edit();
ed.putInt("fontSize", progress);
ed.apply();
}
And then use the saved value to set the text size of each text when the activity starts
int textSize = prefs.getInt("fontSize", defaultValue); // put your default value here like 16
textView.setTextSize(textSize);
//similarly set the textsize for other views

How to control mp3 audio volume using JMF in JAVA

I am using JMF for playing mp3 Audio file.It is playing but I have no idea how to control its volume? I am using
Player audioPlayer = Manager.createRealizedPlayer(url);
audioPlayer.start();

See Player.getGainControl() which:
Gets the object for controlling this Player's audio gain. If this player does not have a GainControl, getGainControl returns null. For example, getGainControl might return null if the Player does not play audio data.
On GainControl:
GainControl is an interface for manipulating audio signal gain.
Gain and Gain Measures
Gain is a multiplicative value applied to an audio signal that modifies the amplitude of the signal. This interface allows the gain to be specified in either decibels or using a floating point value that varies between 0.0 and 1.0.

I did it on Android in this fashion.
audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
final int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int curVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
SeekBar volumecontrol = (SeekBar) findViewById(R.id.seekBar);
volumecontrol.setMax(maxVolume);
volumecontrol.setProgress(curVolume);
volumecontrol.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromuser) {
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,progress, 0);
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});

Android Force Close because of SeekBar element

E/AndroidRuntime(7183): Caused by: java.lang.ClassCastException: android.widget.SeekBar cannot be cast to android.widget.EditText
is this true?
if you can't use a seekbar to change text in a EditText element then what should i use?
a static TextView?
because i need a slider aka SeekBar for my app
thanks in advance
here's the code
private OnSeekBarChangeListener customSeekBarListener = new OnSeekBarChangeListener()
{
// update currentCustomPercent, then call updateCustom
#Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
// sets currentCustomPercent to position of seekBars's thumb
currentCustomPercent = seekBar.getProgress();
updateCustom(); // updates EditTexts for custom part and Total
} // end method on progressChanged
#Override
public void onStartTrackingTouch(SeekBar seekBar)
{
} // end method onStartTrackingTouch
#Override
public void onStopTrackingTouch(SeekBar seekBar)
{
}
}; // end onSeekBarChangeListener
the program doesn't error but it force closes... and the logcat say's that this is screwed up.. 6 hours worth of work... down the toilet... #flush

Probably you are casting seekBarobject to editText in method:
onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
If yes, just do the following:
onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
{
editText.setText(""+progress);
}