簡介
本文介紹該自定義view的使用及實現的方法,主要實現以下幾個功能:
- 選取圓盤選色圖片上的顏色,實時監聽
- 可設置選色指示圖片,跟隨觸摸位置、指示所選顏色,示例中爲白色圓環
- 可自己設置選色圖片(目前只支持圓形圖片)
使用效果
首先看下使用效果:
使用示例
在項目中導入該庫
在工程的 build.gradle中加入:
allprojects {
repositories {
...
maven { url "https://jitpack.io" }
}
}
module的build.gradle中加入依賴:
dependencies {
compile 'com.github.autume:ColorPickerView:1.0'
}
xml
<RelativeLayout
android:id="@+id/rl_picker"
android:layout_below="@+id/img_color"
android:layout_marginTop="30dp"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<colorpickerview.oden.com.colorpicker.ColorPickerView
android:id="@+id/color_picker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ImageView
android:id="@+id/img_picker"
android:layout_centerInParent="true"
android:src="@mipmap/color_picker"
android:layout_width="25dp"
android:layout_height="25dp" />
</RelativeLayout>
選色代碼
private void initRgbPicker() {
colorPickerView = (ColorPickerView) findViewById(R.id.color_picker);
colorPickerView.setImgPicker(MainActivity.this, img_picker, 25); //最後一個參數是該顏色指示圈的大小(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) {
}
});
}
對外公開的API
public void setImgPicker(final Context context, final ImageView imgPicker, final int pickerViewWidth)
public void setImgResource(final int imgResource)
public void setColorChangedListener(onColorChangedListener colorChangedListener)
實現過程
attrs屬性
可通過picture_resource屬性設置用來選色的資源id,現僅支持圓形圖片
<declare-styleable name="ColorPickerView">
<attr name="picture_resource" format="reference"/>
</declare-styleable>
xml
佈局中就是放入一個ImageView控件
<?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>
屬性獲取及view初始化
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();//獲取圓盤圖片
}
顏色回調監聽
private onColorChangedListener colorChangedListener;//顏色變換監聽
public void setColorChangedListener(onColorChangedListener colorChangedListener) {
this.colorChangedListener = colorChangedListener;
}
/**
* 顏色變換監聽接口
*/
public interface onColorChangedListener {
void colorChanged(int red, int blue, int green);
void stopColorChanged(int red, int blue, int green);
}
觸摸事件
觸摸事件寫在父控件上,可以統一處理用來選色的view及指示選色位置的view(imgPicker),imgPicker爲指示顯示位置的圓框,若設置了則跟隨手指移動。
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; //圓盤半徑
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());
//觸摸點與圓盤圓心距離
float diff = (float) Math.sqrt((centreY - yInView) * (centreY - yInView) + (centreX - xInView) *
(centreX - xInView));
//在選色圖片內則進行讀取顏色等操作
if (diff <= select_radius) {
//選色位置指示,若設置了則移動到點取的位置
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;
//讀取顏色
int pixel = bitmap.getPixel((int) (event.getX() - imgColorRang.getLeft()), (int) (event.getY() - imgColorRang.getTop())); //獲取選擇像素
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;
}
});
}
設置指示圖標
設置圖標,同時根據圖標的大小設置控件的padding避免在邊界處顯示不全的問題。
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();//獲取圓盤圖片
}
},10);
}
總結
ok,至此,一個比較簡單的選色器就完成了。