activity_main.xmlMainActivity.java
<?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" android:padding="16dp" tools:context="com.example.application.seekbartutorial.MainActivity"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@id/progressBar" android:layout_centerHorizontal="true" android:layout_marginBottom="24dp" android:text="0%" android:textSize="30sp" /> <ProgressBar android:id="@+id/progressBar" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@id/seekBar" android:layout_alignParentStart="true" android:layout_marginBottom="21dp" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentStart="true" android:layout_centerVertical="true" /> </RelativeLayout>
package com.example.application.seekbartutorial; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.ProgressBar; import android.widget.SeekBar; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private TextView textView; private ProgressBar progressBar; private SeekBar seekBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = (TextView) findViewById(R.id.textView); progressBar = (ProgressBar) findViewById(R.id.progressBar); seekBar = (SeekBar) findViewById(R.id.seekBar); seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { progressBar.setProgress(progress); textView.setText("" + progress + "%"); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); } }