Android学习笔记15---拖动条的实现

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activity_main.xml

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout 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="com.amy.seekbartest.MainActivity">    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="当前值：50"        android:textSize="16sp"        android:paddingTop="40dp"        android:paddingLeft="15dp"        tools:layout_editor_absoluteY="0dp"        tools:layout_editor_absoluteX="0dp" />    <!-- 拖动条 -->    <SeekBar        android:id="@+id/seekBar1"        android:layout_height="wrap_content"        android:max="100"        android:layout_width="match_parent"        android:progress="50"        android:paddingTop="10dp"        tools:layout_editor_absoluteY="0dp"        tools:layout_editor_absoluteX="32dp" /></android.support.constraint.ConstraintLayout>

MainActivity.java

package com.amy.seekbartest;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.SeekBar;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private SeekBar seekBar;//拖动条    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final TextView result = (TextView) findViewById(R.id.textView1);        seekBar = (SeekBar) findViewById(R.id.seekBar1);        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {                result.setText("当前值："+progress);            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {                Toast.makeText(MainActivity.this,"开始滑动",Toast.LENGTH_SHORT).show();            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                Toast.makeText(MainActivity.this,"结束滑动",Toast.LENGTH_SHORT).show();            }        });    }}

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