Google推出的Palette是用来调色的，正如其汉语意思一样，可以用来显示颜色，在显示图片的时候，会配合图片的色调来显示，这样就显得很融合，其实Palette可以分析出图片中的很多特性，例如主色调、鲜艳度、柔和度等
Palette获得的颜色
其主要的获取颜色方法如下：
获取主要颜色：getDominantColor()
获取柔和颜色：getMutedColor()
获取鲜艳颜色：getVibrantColor()
获取亮、柔和颜色：getLightMutedColor()
获取亮、鲜艳颜色：getLightVibrantColor()
获取暗、柔和颜色：getDarkMutedColor()
获取暗、鲜艳颜色：getDarkVibrantColor()
Palette实例
在一张图片中显示出获得的以上颜色，并以Google推荐的颜色显示在图片上
在手机中找到一张以前做的拍黄瓜的图片，还有煎鸡蛋的图片，这里就是用这两张图片来演示，代码没有任何变化，只是改变了ImageView里面的src源
在使用Palette要先导入依赖，25.4.0为版本号
implementation 'com.android.support:palette-v7:25.4.0'
贴出布局
<?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:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="300dp">
<ImageView
android:id="@+id/image_view"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_centerInParent="true"
android:src="@drawable/cuke" />
<TextView
android:id="@+id/text_view"
android:layout_marginTop="5dp"
android:layout_width="300dp"
android:layout_height="120dp"
android:layout_centerHorizontal="true"
android:layout_alignBottom="@id/image_view"
android:gravity="center"
android:textSize="24sp"/>
</RelativeLayout>
<TextView
android:id="@+id/text_view_1"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp"/>
<TextView
android:id="@+id/text_view_2"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp"/>
<TextView
android:id="@+id/text_view_3"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp"/>
<TextView
android:id="@+id/text_view_4"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp"/>
<TextView
android:id="@+id/text_view_5"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp"/>
<TextView
android:id="@+id/text_view_6"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp" />
<TextView
android:id="@+id/text_view_7"
android:layout_marginTop="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="24sp"/>
</LinearLayout>
然后在活动中使用
public class MainActivity extends AppCompatActivity {
private ImageView imageView;
private TextView textView1;
private TextView textView2;
private TextView textView3;
private TextView textView4;
private TextView textView5;
private TextView textView6;
private TextView textView7;
private TextView textView;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.image_view);
textView1 = (TextView) findViewById(R.id.text_view_1);
textView2 = (TextView) findViewById(R.id.text_view_2);
textView3 = (TextView) findViewById(R.id.text_view_3);
textView4 = (TextView) findViewById(R.id.text_view_4);
textView5 = (TextView) findViewById(R.id.text_view_5);
textView6 = (TextView) findViewById(R.id.text_view_6);
textView7 = (TextView) findViewById(R.id.text_view_7);
textView = (TextView) findViewById(R.id.text_view);
BitmapDrawable bitmapDrawable = (BitmapDrawable) imageView.getDrawable();
Bitmap bitmap = bitmapDrawable.getBitmap();
//同步方法，已弃用，可能造成线程阻塞
//Palette palette = Palette.generate(bitmap);
//异步
Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
@Override
public void onGenerated(Palette palette) {
int dominantColor = palette.getDominantColor(Color.GRAY);
textView1.setBackgroundColor(dominantColor);
textView1.setText("DominantColor");
int mutedColor = palette.getMutedColor(Color.GRAY);
textView2.setBackgroundColor(mutedColor);
textView2.setText("MutedColor");
int vibrantColor = palette.getVibrantColor(Color.GRAY);
textView3.setBackgroundColor(vibrantColor);
textView3.setText("VibrantColor");
int lightMutedColor = palette.getLightMutedColor(Color.GRAY);
textView4.setBackgroundColor(lightMutedColor);
textView4.setText("LightMutedColor");
int lightVibrantColor = palette.getLightVibrantColor(Color.GRAY);
textView5.setBackgroundColor(lightVibrantColor);
textView5.setText("LightVibrantColor");
int darkMutedColor = palette.getDarkMutedColor(Color.GRAY);
textView6.setBackgroundColor(darkMutedColor);
textView6.setText("DarkMutedColor");
int darkVibrantColor = palette.getDarkVibrantColor(Color.GRAY);
textView7.setBackgroundColor(darkVibrantColor);
textView7.setText("DarkVibrantColor");
//推荐颜色获取
Palette.Swatch swatch = palette.getLightVibrantSwatch();
//推荐的主色调
int rgb = swatch.getRgb();
//推荐的主体文字颜色
int bodyTextColor = swatch.getBodyTextColor();
//推荐的标题文字颜色
int titleTextColor = swatch.getTitleTextColor();
//颜色向量
float[] hsl = swatch.getHsl();
//得到该颜色在图片中的值
int population = swatch.getPopulation();
textView.setBackgroundColor(getTranslucentColor(0.7F, rgb));
textView.setTextColor(bodyTextColor);
textView.setText("这是一道我做的菜");
}
});
}
private int getTranslucentColor(float persent, int rgb) {
//转化透明度
int blue = rgb & 0xFF;
int green = rgb >>> 8 & 0xFF;
int red = rgb >>> 16 & 0xFF;
int alpha = rgb >>> 24;
alpha = Math.round(alpha * persent);
return Color.argb(alpha, red, green, blue);
}
}
运行结果如下
