android levellistdrawable 基本使用

我就是我 2022-07-15 03:13 115阅读 0赞

levellistdrawable可以通过改变level值来切换相应的图片。

一：在drawablw文件夹下：

<?xml version="1.0" encoding="utf-8"?>
    <level-list xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:drawable="@drawable/lamp_on" //灯亮的图片
            android:minLevel="12"
            android:maxLevel="20"/>
    
        <item android:drawable="@drawable/lamp_off" //灯灭的图片
              android:minLevel="6"
              android:maxLevel="10"/>
    </level-list>

二：布局文件

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                  android:orientation="vertical"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent">
    
        <ImageView
            android:src="@drawable/bitmap"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/iv_drawable"/>
    
        <Button
            android:id="@+id/btn_on"
            android:text="light on"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    
        <Button
            android:id="@+id/btn_off"
            android:text="light off"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    </LinearLayout>

三：activity

package com.example.kirito.myapplication.testdrawable;
    
    import android.os.Bundle;
    import android.support.annotation.Nullable;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.widget.Button;
    import android.widget.ImageView;
    
    import com.example.kirito.myapplication.R;
    
    /**
     * Created by kirito on 2016.10.31.
     */
    
    public class TestDrawable extends AppCompatActivity implements View.OnClickListener{
        private Button on,off;
        private ImageView iv;
    
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.testdrawable);
    
            on = (Button) findViewById(R.id.btn_on);
            off = (Button) findViewById(R.id.btn_off);
            on.setOnClickListener(this);
            off.setOnClickListener(this);
            iv = (ImageView) findViewById(R.id.iv_drawable);
            iv.setImageLevel(8);
        }
    
        @Override
        public void onClick(View v) {
            if (v.getId() == R.id.btn_off){
                //设置的level值必须在6-10之间
                iv.setImageLevel(8);
            }else if (v.getId() == R.id.btn_on){
                //设置的level值必须在12-20之间
                iv.setImageLevel(18);
            }
        }
    }

四：效果图

![Center][]![Center 1][]

[Center]: https://img-blog.csdn.net/20161031142808795?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: /images/20220715/32c1ef11f0d248f08308a8b706c5e275.png