Android中颜色选择器和改变字体颜色的实例教程

// 创建七彩图片 private void init() { int[] oc = { 0xffff0000, 0xffffff00, 0xff00ff00, 0xff00ffff,  0xff0000ff, 0xffff00ff, 0xffff0000 }; float[] op = { 0, 0.16667f, 0.33333f, 0.5f, 0.66667f, 0.83333f, 1 }; LinearGradient lg = new LinearGradient(0, 0, ORIWIDTH, 0, oc, op,  TileMode.MIRROR); LinearGradient lg2 = new LinearGradient(0, 0, 0, ORIHEIGHT, 0x00808080,  0xff808080, TileMode.MIRROR); oriColor = Bitmap.createBitmap(ORIWIDTH, ORIHEIGHT, Config.ARGB_8888); Canvas c = new Canvas(oriColor); paint.setShader(lg); c.drawRect(0, 0, ORIWIDTH, ORIHEIGHT, paint); paint.setShader(lg2); c.drawRect(0, 0, ORIWIDTH, ORIHEIGHT, paint); }// 右边的亮度栏 private void drawABar(Canvas c) { int x, y; x = (roundColor & 0x00ffffff); y = (x | 0xff000000); LinearGradient lg = new LinearGradient(0, 0, layoutWidth, 0, x, y,  TileMode.MIRROR); // 初始化 x 240 + 6 * 2 y = ORIHEIGHT + (GAP << 2) - GAP + BARHEIGHT;  paint.setColor(0xffffffff);  c.drawBitmap(aBk, 0, y, paint); paint.setShader(lg); c.drawRect(0, y, layoutWidth, y + BARHEIGHT, paint); }

package com.xsl.colorpicker; import android.app.Dialog;  import android.content.Context;  import android.graphics.Canvas;  import android.graphics.Color;  import android.graphics.LinearGradient;  import android.graphics.Paint;  import android.graphics.RectF;  import android.graphics.Shader;  import android.graphics.SweepGradient;  import android.os.Bundle;  import android.util.Log;  import android.view.MotionEvent;  import android.view.View;  import android.view.WindowManager;     public class ColorPickerDialog extends Dialog {    private final boolean debug = true;    private final String TAG = "ColorPicker";         Context context;    private String title;    //标题    private int mInitialColor; //初始颜色    private OnColorChangedListener mListener;       /**     * 初始颜色黑色     * @param context     * @param title 对话框标题     * @param listener 回调     */    public ColorPickerDialog(Context context, String title,         OnColorChangedListener listener) {      this(context, Color.BLACK, title, listener);    } 

  /**     *     * @param context     * @param initialColor 初始颜色     * @param title 标题     * @param listener 回调     */    public ColorPickerDialog(Context context, int initialColor,         String title, OnColorChangedListener listener) {      super(context);      this.context = context;      mListener = listener;      mInitialColor = initialColor;      this.title = title;    }       @Override    protected void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      WindowManager manager = getWindow().getWindowManager();      int height = (int) (manager.getDefaultDisplay().getHeight() * 0.38f);    //0.5      int width = (int) (manager.getDefaultDisplay().getWidth() * 0.5f);     //0.7      ColorPickerView myView = new ColorPickerView(context, height, width);      setContentView(myView);      setTitle(title);    } 

  private class ColorPickerView extends View {      private Paint mPaint;      //渐变色环画笔      private Paint mCenterPaint;   //中间圆画笔      private Paint mLinePaint;    //分隔线画笔      private Paint mRectPaint;    //渐变方块画笔             private Shader rectShader;   //渐变方块渐变图像      private float rectLeft;     //渐变方块左x坐标      private float rectTop;     //渐变方块右x坐标      private float rectRight;    //渐变方块上y坐标      private float rectBottom;    //渐变方块下y坐标             private final int[] mCircleColors;   //渐变色环颜色      private final int[] mRectColors;    //渐变方块颜色             private int mHeight;          //View高      private int mWidth;           //View宽      private float r;            //色环半径(paint中部)      private float centerRadius;       //中心圆半径             private boolean downInCircle = true;  //按在渐变环上      private boolean downInRect;       //按在渐变方块上      private boolean highlightCenter;    //高亮      private boolean highlightCenterLittle; //微亮             public ColorPickerView(Context context, int height, int width) {        super(context);        this.mHeight = height - 36;        this.mWidth = width;        setMinimumHeight(height - 36);        setMinimumWidth(width);                 //渐变色环参数        mCircleColors = new int[] {0xFFFF0000, 0xFFFF00FF, 0xFF0000FF,             0xFF00FFFF, 0xFF00FF00,0xFFFFFF00, 0xFFFF0000};        Shader s = new SweepGradient(0, 0, mCircleColors, null);        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setShader(s);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setStrokeWidth(50);        r = width / 2 * 0.7f - mPaint.getStrokeWidth() * 0.5f;                 //中心圆参数        mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mCenterPaint.setColor(mInitialColor);        mCenterPaint.setStrokeWidth(5);        centerRadius = (r - mPaint.getStrokeWidth() / 2 ) * 0.7f;                 //边框参数        mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mLinePaint.setColor(Color.parseColor("#72A1D1"));        mLinePaint.setStrokeWidth(4);                 //黑白渐变参数        mRectColors = new int[]{0xFF000000, mCenterPaint.getColor(), 0xFFFFFFFF};        mRectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mRectPaint.setStrokeWidth(5);        rectLeft = -r - mPaint.getStrokeWidth() * 0.5f;        rectTop = r + mPaint.getStrokeWidth() * 0.5f +             mLinePaint.getStrokeMiter() * 0.5f + 15;        rectRight = r + mPaint.getStrokeWidth() * 0.5f;        rectBottom = rectTop + 50;      } 

     @Override      protected void onDraw(Canvas canvas) {        //移动中心        canvas.translate(mWidth / 2, mHeight / 2 - 50);        //画中心圆        canvas.drawCircle(0, 0, centerRadius, mCenterPaint);                 //是否显示中心圆外的小圆环        if (highlightCenter || highlightCenterLittle) {          int c = mCenterPaint.getColor();          mCenterPaint.setStyle(Paint.Style.STROKE);          if(highlightCenter) {            mCenterPaint.setAlpha(0xFF);          }else if(highlightCenterLittle) {            mCenterPaint.setAlpha(0x90);          }          canvas.drawCircle(0, 0,               centerRadius + mCenterPaint.getStrokeWidth(), mCenterPaint);                     mCenterPaint.setStyle(Paint.Style.FILL);          mCenterPaint.setColor(c);        } 

      //画色环        canvas.drawOval(new RectF(-r, -r, r, r), mPaint);        //画黑白渐变块        if(downInCircle) {          mRectColors[1] = mCenterPaint.getColor();        }        rectShader = new LinearGradient(rectLeft, 0, rectRight, 0, mRectColors, null, Shader.TileMode.MIRROR);        mRectPaint.setShader(rectShader);        canvas.drawRect(rectLeft, rectTop, rectRight, rectBottom, mRectPaint);        float offset = mLinePaint.getStrokeWidth() / 2;        canvas.drawLine(rectLeft - offset, rectTop - offset * 2,             rectLeft - offset, rectBottom + offset * 2, mLinePaint);//左        canvas.drawLine(rectLeft - offset * 2, rectTop - offset,             rectRight + offset * 2, rectTop - offset, mLinePaint);//上        canvas.drawLine(rectRight + offset, rectTop - offset * 2,             rectRight + offset, rectBottom + offset * 2, mLinePaint);//右        canvas.drawLine(rectLeft - offset * 2, rectBottom + offset,             rectRight + offset * 2, rectBottom + offset, mLinePaint);//下        super.onDraw(canvas);      }             @Override      public boolean onTouchEvent(MotionEvent event) {        float x = event.getX() - mWidth / 2;        float y = event.getY() - mHeight / 2 + 50;        boolean inCircle = inColorCircle(x, y,             r + mPaint.getStrokeWidth() / 2, r - mPaint.getStrokeWidth() / 2);        boolean inCenter = inCenter(x, y, centerRadius);        boolean inRect = inRect(x, y);                 switch (event.getAction()) {          case MotionEvent.ACTION_DOWN:            downInCircle = inCircle;            downInRect = inRect;            highlightCenter = inCenter;          case MotionEvent.ACTION_MOVE:            if(downInCircle && inCircle) {//down按在渐变色环内, 且move也在渐变色环内              float angle = (float) Math.atan2(y, x);              float unit = (float) (angle / (2 * Math.PI));              if (unit < 0) {                unit += 1;              }              mCenterPaint.setColor(interpCircleColor(mCircleColors, unit));              if(debug) Log.v(TAG, "色环内, 坐标: " + x + "," + y);            }else if(downInRect && inRect) {//down在渐变方块内, 且move也在渐变方块内              mCenterPaint.setColor(interpRectColor(mRectColors, x));            }            if(debug) Log.v(TAG, "[MOVE] 高亮: " + highlightCenter + "微亮: " + highlightCenterLittle + " 中心: " + inCenter);            if((highlightCenter && inCenter) || (highlightCenterLittle && inCenter)) {//点击中心圆, 当前移动在中心圆              highlightCenter = true;              highlightCenterLittle = false;            } else if(highlightCenter || highlightCenterLittle) {//点击在中心圆, 当前移出中心圆              highlightCenter = false;              highlightCenterLittle = true;            } else {              highlightCenter = false;              highlightCenterLittle = false;            }            invalidate();            break;          case MotionEvent.ACTION_UP:            if(highlightCenter && inCenter) {//点击在中心圆, 且当前启动在中心圆              if(mListener != null) {                mListener.colorChanged(mCenterPaint.getColor());                ColorPickerDialog.this.dismiss();              }            }            if(downInCircle) {              downInCircle = false;            }            if(downInRect) {              downInRect = false;            }            if(highlightCenter) {              highlightCenter = false;            }            if(highlightCenterLittle) {              highlightCenterLittle = false;            }            invalidate();            break;        }        return true;      }         @Override      protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(mWidth, mHeight);      } 

    /**       * 坐标是否在色环上       * @param x 坐标       * @param y 坐标       * @param outRadius 色环外半径       * @param inRadius 色环内半径       * @return       */      private boolean inColorCircle(float x, float y, float outRadius, float inRadius) {        double outCircle = Math.PI * outRadius * outRadius;        double inCircle = Math.PI * inRadius * inRadius;        double fingerCircle = Math.PI * (x * x + y * y);        if(fingerCircle < outCircle && fingerCircle > inCircle) {          return true;        }else {          return false;        }      } 

    /**       * 坐标是否在中心圆上       * @param x 坐标       * @param y 坐标       * @param centerRadius 圆半径       * @return       */      private boolean inCenter(float x, float y, float centerRadius) {        double centerCircle = Math.PI * centerRadius * centerRadius;        double fingerCircle = Math.PI * (x * x + y * y);        if(fingerCircle < centerCircle) {          return true;        }else {          return false;        }      } 

    /**       * 坐标是否在渐变色中       * @param x       * @param y       * @return       */      private boolean inRect(float x, float y) {        if( x <= rectRight && x >=rectLeft && y <= rectBottom && y >=rectTop) {          return true;        } else {          return false;        }      } 

    /**       * 获取圆环上颜色       * @param colors       * @param unit       * @return       */      private int interpCircleColor(int colors[], float unit) {        if (unit <= 0) {          return colors[0];        }        if (unit >= 1) {          return colors[colors.length - 1];        }                 float p = unit * (colors.length - 1);        int i = (int)p;        p -= i;           // now p is just the fractional part [0...1) and i is the index        int c0 = colors[i];        int c1 = colors[i+1];        int a = ave(Color.alpha(c0), Color.alpha(c1), p);        int r = ave(Color.red(c0), Color.red(c1), p);        int g = ave(Color.green(c0), Color.green(c1), p);        int b = ave(Color.blue(c0), Color.blue(c1), p);                 return Color.argb(a, r, g, b);      } 

    /**       * 获取渐变块上颜色       * @param colors       * @param x       * @return       */      private int interpRectColor(int colors[], float x) {        int a, r, g, b, c0, c1;        float p;        if (x < 0) {          c0 = colors[0];           c1 = colors[1];          p = (x + rectRight) / rectRight;        } else {          c0 = colors[1];          c1 = colors[2];          p = x / rectRight;        }        a = ave(Color.alpha(c0), Color.alpha(c1), p);        r = ave(Color.red(c0), Color.red(c1), p);        g = ave(Color.green(c0), Color.green(c1), p);        b = ave(Color.blue(c0), Color.blue(c1), p);        return Color.argb(a, r, g, b);      }             private int ave(int s, int d, float p) {        return s + Math.round(p * (d - s));      }    } 

  /**     * 回调接口    */    public interface OnColorChangedListener {      /**       * 回调函数       * @param color 选中的颜色       */      void colorChanged(int color);    }         public String getTitle() {      return title;    }       public void setTitle(String title) {      this.title = title;    }       public int getmInitialColor() {      return mInitialColor;    }       public void setmInitialColor(int mInitialColor) {      this.mInitialColor = mInitialColor;    }       public OnColorChangedListener getmListener() {      return mListener;    }       public void setmListener(OnColorChangedListener mListener) {      this.mListener = mListener;    }  } 

package com.xsl.colorpicker;  import android.app.Activity;  import android.content.Context;  import android.os.Bundle;  import android.view.View;  import android.widget.Button;  import android.widget.TextView;  public class PaintDemoActivity extends Activity {     Context context;      private Button btnColorPicker;      private TextView tvText;            private ColorPickerDialog dialog;      @Override     public void onCreate(Bundle savedInstanceState) {      context = this;      super.onCreate(savedInstanceState);      setContentView(R.layout.main);      initViews();    }         /**      * 初始化UI      */     private void initViews() {        btnColorPicker = (Button) findViewById(R.id.button1);        btnColorPicker.setOnClickListener(new View.OnClickListener() {                    public void onClick(View v) {            dialog = new ColorPickerDialog(context, tvText.getTextColors().getDefaultColor(),                getResources().getString(R.string.app_name),                new ColorPickerDialog.OnColorChangedListener() {              public void colorChanged(int color) {                tvText.setTextColor(color);              }            });            dialog.show();        }        });       tvText = (TextView) findViewById(R.id.tv);      }    }