Android 提取图片背景方法(纯色)

╰+哭是因爲堅強的太久メ 2022-09-26 03:15 296阅读 0赞

**实现目标：提取随意一张图片的7种颜色（图片拥有7种以上的颜色），可作为背景色使用。**

**布局(自己增添toolbar)：**

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/rl"
        tools:context=".BackgroundActivity">
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:src="@mipmap/fp"
        android:scaleType="centerCrop"
        android:id="@+id/img"
        android:layout_below="@+id/toolbar"
        android:layout_alignParentStart="true" />
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/bt1"
            android:text="提取颜色"
            android:layout_below="@+id/img"
            android:layout_centerHorizontal="true" />
    
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />
    
    </RelativeLayout>

**代码：**

package com.example.administrator.jreduch12;
    
    import android.graphics.Bitmap;
    import android.graphics.Color;
    import android.graphics.drawable.BitmapDrawable;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.support.v7.graphics.Palette;
    import android.support.v7.widget.Toolbar;
    import android.view.View;
    import android.widget.Button;
    import android.widget.ImageView;
    import android.widget.RelativeLayout;
    
    public class BackgroundActivity extends AppCompatActivity {
        private ImageView img;
        private Bitmap bitmap;
        private Button bt1;
        private RelativeLayout rl;
        private int which;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            toolbar.setTitle("这是提取纯色图片");
            setSupportActionBar(toolbar);
    
            rl= (RelativeLayout) findViewById(R.id.rl);
            img= (ImageView) findViewById(R.id.img);
            bt1= (Button) findViewById(R.id.bt1);
            BitmapDrawable bitmapDrawable= (BitmapDrawable) img.getDrawable();
            bitmap=bitmapDrawable.getBitmap();
            which=0;
            bt1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Palette palette=Palette.from(bitmap).generate();
                    int defaultColor= Color.BLUE;
                    int color=0;
                    switch (which) {
                        case 0:
                            color=palette.getMutedColor(defaultColor);
                            rl.setBackgroundColor(color);
                            which++;
                            break;
                        case 1:
                            color=palette.getDarkMutedColor(defaultColor);
                            rl.setBackgroundColor(color);
                            which++;
                            break;
                        case 2:
                            color=palette.getLightMutedColor(defaultColor);
                            rl.setBackgroundColor(color);
                            which++;
                            break;
                        case 3:
                            color=palette.getVibrantColor(defaultColor);
                            rl.setBackgroundColor(color);
                            which++;
                            break;
                        case 4:
                            color=palette.getDarkVibrantColor(defaultColor);
                            rl.setBackgroundColor(color);
                            which++;
                            break;
                        case 5:
                            color=palette.getLightVibrantColor(defaultColor);
                            rl.setBackgroundColor(color);
                            which++;
                            break;
                    }
                }
            });
        }
    }

**效果展示：**  
![Center][] ![Center 1][] ![Center 2][]

![Center 3][]![Center 4][]![Center 5][]

![Center 6][]

[Center]: https://img-blog.csdn.net/20160919200402816?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20160919200411503?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 2]: /images/20220717/0dd1c7c41c6b4a59a2b8bd23467dc555.png
[Center 3]: https://img-blog.csdn.net/20160919200437354?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 4]: https://img-blog.csdn.net/20160919200513411?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 5]: /images/20220717/a467c4e589864a0d92440429a115adce.png
[Center 6]: /images/20220717/781f4ef4dbdb40f5a5b49135774a44f5.png