SeekBar是Progress的子类,Progress主要用来显示进度,但是不能和用户互动,而SeekBar则可以供用户进行拖动改变进度值
实现拖动进度条并显示在文本中:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical">
<SeekBar
android:id="@+id/seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:progress="30"/>
<TextView
android:id="@+id/tvProgress"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="数值范围0~100之间,当前值:30"
android:textSize="20sp"
android:gravity="center"/>
</LinearLayout>
package com.example.jiandanduihuakuang;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private SeekBar seekBar;
private TextView tvProgress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化控件
seekBar = findViewById(R.id.seekBar);
tvProgress = findViewById(R.id.tvProgress);
//注册拖动监听器
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
//将seekBar的进度设置在textView上
tvProgress.setText("数值范围0~100之间,当前值:"+progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
}