In this article, ProtractorView is added to android. ProtractorView is a semicircular Seekbar view for selecting an angle from 0° to 180. Seek bar is a type of progress bar. Change the cursor from 0° to 180 for selecting an angle. Below is the image of ProtractorView.
Step By Step Implementation
Step 1: Create a New Project in Android Studio
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. The code for that has been given in both Java and Kotlin Programming Language for Android.
Step 2: Add the Required Dependencies
Navigate to the Gradle Scripts > build.gradle(Module:app) and Add the Below Dependency in the Dependencies section.
implementation 'com.github.GoodieBag:ProtractorView:v1.2'
Add the Support Library in your settings.gradle File. This library Jitpack is a novel package repository. It is made for JVM so that any library which is present in Github and Bitbucket can be directly used in the application.
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
// add the following
maven { url "https://jitpack.io" }
}
}
After adding this Dependency, Sync the Project and now we will move towards its implementation.
Step 3: Working with the XML Files
Next, go to the activity_main.xml file, which represents the UI of the project. Below is the code for the activity_main.xml file. Comments are added inside the code to understand the code in more detail.
XML
<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <com.goodiebag.protractorview.ProtractorView android:id="@+id/protractorview" android:layout_width="wrap_content" android:layout_height="wrap_content" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:textProgressColor="#FF00" app:tickProgressColor="#abe6" /> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="136dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.498" app:layout_constraintStart_toStartOf="parent" /></androidx.constraintlayout.widget.ConstraintLayout> |
Step 4: Working with the MainActivity File
Go to the MainActivity File and refer to the following code. Below is the code for the MainActivity File. Comments are added inside the code to understand the code in more detail. In this file, add interval, color, and setOnProtractorViewChangeListener to our ProtractorView. Whenever progress is changed setOnProtractorViewChangeListener is get invoked automatically. Here the changed angle value is shown in TextView.
Java
import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.widget.TextView;import com.goodiebag.protractorview.ProtractorView;public class MainActivity extends AppCompatActivity { TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ProtractorView protractorView = (ProtractorView) findViewById(R.id.protractorview); textView = findViewById(R.id.textView); protractorView.setTickIntervals(15); protractorView.setArcColor(getColor(R.color.colorAccent)); protractorView.setProgressColor(getColor(R.color.myColor)); protractorView.setOnProtractorViewChangeListener(new ProtractorView.OnProtractorViewChangeListener() { @Override public void onProgressChanged(ProtractorView pv, int progress, boolean b) { textView.setText("" + progress); } @Override public void onStartTrackingTouch(ProtractorView pv) { } @Override public void onStopTrackingTouch(ProtractorView pv) { } }); }} |
Kotlin
import android.os.Buildimport android.os.Bundleimport android.widget.TextViewimport androidx.appcompat.app.AppCompatActivityimport com.goodiebag.protractorview.ProtractorViewclass MainActivity : AppCompatActivity() { private lateinit var textView: TextView override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val protractorView = findViewById<ProtractorView>(R.id.protractorview) textView = findViewById(R.id.textView) protractorView.setTickIntervals(15) if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { protractorView.setArcColor(getColor(R.color.colorAccent)) protractorView.setProgressColor(getColor(R.color.myColor)) } protractorView.setOnProtractorViewChangeListener(object : OnProtractorViewChangeListener() { fun onProgressChanged(pv: ProtractorView?, progress: Int, b: Boolean) { textView.text = "" + progress } fun onStartTrackingTouch(pv: ProtractorView?) { } fun onStopTrackingTouch(pv: ProtractorView?) { } }) }} |
