2.09SeekBar(拖动条)-UI组件-Android

SeekBar(拖动条)-UI组件-Android
案例

TOC

SeekBar(拖动条)-UI组件-Android

常用属性

属性名	说明
android:max="100"	滑动条的最大值
android:progress="60"	滑动条的当前值
android:secondaryProgress="70"	二级滑动条的进度
android:thumb = "@mipmap/sb_icon"	滑块的drawable

SeekBar.OnSeekBarChangeListener 的方法

方法	说明
onProgressChanged：	进度发生改变时会触发
onStartTrackingTouch：	按住SeekBar时会触发
onStopTrackingTouch：	放开SeekBar时触发

案例

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <SeekBar
        android:id="@+id/sb_normal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/txt_cur"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:textSize="30sp" />

    <SeekBar
        android:id="@+id/sb_custom"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:maxHeight="5dp"
        android:minHeight="5dp"
        android:progressDrawable="@drawable/sb_bar"
        android:thumb="@drawable/sb_thumb" />
</LinearLayout>

package com.ttit.helloworld;

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

import androidx.appcompat.app.AppCompatActivity;

public class SeekBarActivity extends AppCompatActivity {

    private SeekBar sb_normal, sb_custom;
    private TextView txt_cur;
    private Context mContext;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.seekbar_layout);
        mContext = this;
        sb_normal = (SeekBar) findViewById(R.id.sb_normal);
        sb_custom = (SeekBar) findViewById(R.id.sb_custom);
        txt_cur = (TextView) findViewById(R.id.txt_cur);
        //拖动监听事件
        sb_normal.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                txt_cur.setText("当前进度值:" + progress + "  / 100 ");
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                Toast.makeText(mContext, "触碰SeekBar", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                Toast.makeText(mContext, "放开SeekBar", Toast.LENGTH_SHORT).show();
            }
        });

        sb_custom.setSecondaryProgress(20);//二级进度条,缓冲值
    }

}

定制滑块:sb_bar.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background"><!-- 未选中的滑块背景色--黄色-->
        <shape>
            <solid android:color="#FFFFD042" />
        </shape>
    </item>
    <item android:id="@android:id/secondaryProgress"><!-- 二级背景色-->
        <clip>
            <shape>
                <solid android:color="#999999" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress"><!--一级选中背景色 -->
        <clip>
            <shape>
                <solid android:color="#FF96E85D" />
            </shape>
        </clip>
    </item>
</layer-list>

定制滑块样式:sb_thumb.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@mipmap/seekbar_thumb_pressed" android:state_pressed="true" /><!-- 滑块按下时,滑块样式图形-->
    <item android:drawable="@mipmap/seekbar_thumb_normal" android:state_pressed="false" /><!-- 滑块松开时,滑块样式图形-->
</selector>