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Android: Schieberegler seekbar

02.01.2021 (👁162)


Mit einem SeekBar bekommt man in Android einen Schieberegler, der Werte von 0 bis 100 einstellt.

 

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
xmlns:app="http://schemas.android.com/apk/res-auto"
   
xmlns:tools="http://schemas.android.com/tools"
   
android:layout_width="match_parent"
   
android:layout_height="match_parent"
   
tools:context=".MainActivity">

    <
TextView
       
android:id="@+id/textViewOutput"
       
android:layout_width="wrap_content"
       
android:layout_height="wrap_content"
       
android:text="Output value"
       
android:layout_centerVertical="true"
       
android:layout_centerHorizontal="true"
       
android:height="40sp"
       
android:width="200sp"
       
android:textSize="22sp"
/>

    <
SeekBar
       
android:id="@+id/seekBar"
       
android:layout_width="match_parent"
       
android:layout_height="50sp"
       
android:layout_alignParentBottom="true"
       
android:elevation="5sp" />

</
RelativeLayout>

 

 

 

 

 

MainActivity.java

 

package com.example.demo_light;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

   
@Override
   
protected void onCreate(Bundle savedInstanceState) {
       
super.onCreate(savedInstanceState);
        setContentView(
R.layout.activity_main);

       
TextView textViewOutput =findViewById(R.id.textViewOutput);
       
SeekBar seekBar=findViewById(R.id.seekBar);
       
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
           
int seekBarValue=0;
           
@Override
           
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
               
seekBarValue =i;
               
textViewOutput.setText("Seekbar=" + i);
            }

           
@Override
           
public void onStartTrackingTouch(SeekBar seekBar) {

            }

           
@Override
           
public void onStopTrackingTouch(SeekBar seekBar) {
                
Toast.makeText(MainActivity.this, "Seek bar progress is :" + seekBarValue,
                       
Toast.LENGTH_SHORT).show();
               
textViewOutput.setText("Seekbar=" + seekBarValue);
            }
        });

    }
}