本文介绍该自定义view的使用及实现的方法，主要实现以下几个功能： - 选取圆盘选色图片上的颜色，实时监听 - 可设置选色指示图片，跟随触摸位置、指示所选颜色，示例中为白色圆环 - 可自己设置选色图片（目前只支持圆形图片）
github链接
## 使用效果
首先看下使用效果：
使用示例
### 在项目中导入该库
在工程的 build.gradle中加入：
java
allprojects {
repositories {
...
maven { url "https://jitpack.io" }
}
}
module的build.gradle中加入依赖：
java
dependencies {
compile 'com.github.autume:ColorPickerView:1.0'
}
### xml
```java
### 选色代码
```java
private void initRgbPicker() {
colorPickerView = (ColorPickerView) findViewById(R.id.color_picker);
colorPickerView.setImgPicker(MainActivity.this, img_picker, 25); //最后一个参数是该颜色指示圈的大小(dp)
colorPickerView.setColorChangedListener(new ColorPickerView.onColorChangedListener() {
@Override
public void colorChanged(int red, int blue, int green) {
img_color.setColorFilter(Color.argb(255, red, green, blue));
}
@Override
public void stopColorChanged(int red, int blue, int green) {
}
});
}
#### 对外公开的API ```java public void setImgPicker(final Context context, final ImageView imgPicker, final int pickerViewWidth)
public void setImgResource(final int imgResource)
public void setColorChangedListener(onColorChangedListener colorChangedListener) ```
实现过程
### attrs属性 可通过picture_resource属性设置用来选色的资源id,现仅支持圆形图片 ```java
### xml
布局中就是放入一个ImageView控件
```java
<?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:id="@+id/rl_root"
tools:background="@color/black"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/img_color_rang"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="@mipmap/lights_colors" />
</RelativeLayout>
### 属性获取及view初始化 ```java private void initAttrs(Context context, AttributeSet attrs) { if (null != attrs) { TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ColorPickerView); imgResource = typedArray.getResourceId(R.styleable.ColorPickerView_picture_resource, 0); typedArray.recycle(); } }
private void initView(Context context) {
View view = LayoutInflater.from(context).inflate(R.layout.color_picker, this);
imgColorRang = (ImageView) view.findViewById(R.id.img_color_rang);
rl_root = (RelativeLayout) view.findViewById(R.id.rl_root);
if (imgResource != 0)
imgColorRang.setImageResource(imgResource);
bitmap = ((BitmapDrawable) imgColorRang.getDrawable()).getBitmap();//获取圆盘图片
} ```
颜色回调监听
private onColorChangedListener colorChangedListener;//颜色变换监听
public void setColorChangedListener(onColorChangedListener colorChangedListener) {
this.colorChangedListener = colorChangedListener;
}
/**
* 颜色变换监听接口
*/
public interface onColorChangedListener {
void colorChanged(int red, int blue, int green);
void stopColorChanged(int red, int blue, int green);
}
触摸事件
触摸事件写在父控件上，可以统一处理用来选色的view及指示选色位置的view(imgPicker)，imgPicker为指示显示位置的圆框，若设置了则跟随手指移动。 ```java private void initTouchListener() { rl_root.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) {
if (range_radius == 0) {
range_radius = imgColorRang.getWidth() / 2; //圆盘半径
centreX = imgColorRang.getRight() - range_radius;
centreY = imgColorRang.getBottom() - imgColorRang.getHeight() / 2;
select_radius = range_radius - pickerViewPadding/5;
}
float xInView = event.getX();
float yInView = event.getY();
Log.d(TAG, "xInView: " + xInView + ",yInView: " + yInView + ",left: " + imgColorRang.getLeft() + ",top: " + imgColorRang.getTop() + ",right: " +imgColorRang.getRight() + ",bottom: " + imgColorRang.getBottom());
//触摸点与圆盘圆心距离
float diff = (float) Math.sqrt((centreY - yInView) * (centreY - yInView) + (centreX - xInView) *
(centreX - xInView));
//在选色图片内则进行读取颜色等操作
if (diff <= select_radius) {
//选色位置指示，若设置了则移动到点取的位置
if (imgPicker != null ) {
int xInWindow = (int) event.getX();
int yInWindow = (int) event.getY();
int left = xInWindow + v.getLeft() - imgPicker.getWidth() / 2;
int top = yInWindow + v.getTop() - imgPicker.getWidth() / 2;
int right = left + imgPicker.getWidth();
int bottom = top + imgPicker.getHeight();
imgPicker.layout(left, top, right, bottom);
}
if ((event.getY() - imgColorRang.getTop()) < 0)
return true;
//读取颜色
int pixel = bitmap.getPixel((int) (event.getX() - imgColorRang.getLeft()), (int) (event.getY() - imgColorRang.getTop())); //获取选择像素
if (colorChangedListener != null) {
if (event.getAction() == MotionEvent.ACTION_UP) {
colorChangedListener.stopColorChanged(Color.red(pixel), Color.blue(pixel), Color.green(pixel));
}else {
colorChangedListener.colorChanged(Color.red(pixel), Color.blue(pixel), Color.green(pixel));
}
}
Log.d(TAG, "radValue=" + Color.red(pixel) + " blueValue=" + Color.blue(pixel) + " greenValue" + Color.green(pixel));
}
return true;
}
});
} ```
设置指示图标
设置图标，同时根据图标的大小设置控件的padding避免在边界处显示不全的问题。
java
public void setImgPicker(final Context context, final ImageView imgPicker, final int pickerViewWidth) {
this.imgPicker = imgPicker;
pickerViewPadding = dip2px(context, pickerViewWidth/2);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
rl_root.setPadding(pickerViewPadding, pickerViewPadding, pickerViewPadding, pickerViewPadding);
bitmap = ((BitmapDrawable) imgColorRang.getDrawable()).getBitmap();//获取圆盘图片
}
},10);
}
总结
ok，至此，一个比较简单的选色器就完成了。