Android自定义水平拖动条（SetpSeekBar）

如图所示：拖动进度条，松开时离哪个刻度进，就自动滑到临近的刻度位置

 

 

  1、自定义属性 res->values下创建attrs.xml文件

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<declare-styleable name="EasySeekBar">         <attr name="configuration" format="string"/>         <attr name="progress_bg_color" format="color"/>         <attr name="progress_color" format="color"/>         <attr name="circle_r" format="dimension"/>         <attr name="line" format="dimension"/>         <attr name="circle_color" format="color"/>         <attr name="max_progress" format="integer"/>         <attr name="min_progress" format="integer"/>         <attr name="progress_with" format="integer"/>     </declare-styleable>

2、自定义View

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package com.example.customseekbar.easy;     import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Point; import android.os.Build; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import androidx.annotation.Nullable; import androidx.annotation.RequiresApi; import com.example.customseekbar.R;   public class StepSeekBar extends View {     private Context context;       private String TAG = "StepSeekBar";     private Paint bgPaint;//seekbar背景     private Paint progressPaint;//进度     private Paint circlePaint;//控制小球     private Point centrePoint;//中心坐标     private Point WHPoint; //条形的长宽     private float progress = 0; //进度     private int value ;//值       private int space = 20;//刻度线与进度条的距离       private Paint linePaint;//竖线     private int lineColor = Color.parseColor("#DFB578"); //DFB578  D81B60         private String configuration = "horizontal";//形状 vertical、horizontal、circle、semicircle     private int bgColor;//背景颜色     private int progressColor;//进度颜色     private int circleR;//控制小球半径     private int line;//规格     private int maxProgress;//最大值     private int minProgress;//最小值     private int circleColor;//小球颜色     private int strokeWidth;       private boolean isTure;     private EasySeekBarLister easySeekBarLister;     public StepSeekBar(Context context) {         super(context);         this.context = context;         init(null);     }       public void setEasySeekBarLister(EasySeekBarLister easySeekBarLister) {         this.easySeekBarLister = easySeekBarLister;     }       public StepSeekBar(Context context, @Nullable AttributeSet attrs) {         super(context, attrs);         this.context = context;         init(attrs);     }       public StepSeekBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {         super(context, attrs, defStyleAttr);         this.context = context;         init(attrs);     }       private void init(AttributeSet attrs) {         initAttrs(attrs);         initPaint();     }       private void initAttrs(AttributeSet attrs) {         TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.EasySeekBar);         try {             configuration = typedArray.getString(R.styleable.EasySeekBar_configuration);             bgColor = typedArray.getColor(R.styleable.EasySeekBar_progress_bg_color, Color.parseColor("#999999"));             progressColor = typedArray.getColor(R.styleable.EasySeekBar_progress_color,Color.parseColor("#ffffff"));             circleR = typedArray.getDimensionPixelOffset(R.styleable.EasySeekBar_circle_r,40);             line = typedArray.getDimensionPixelOffset(R.styleable.EasySeekBar_line,400);             maxProgress = typedArray.getInt(R.styleable.EasySeekBar_max_progress,100);             minProgress = typedArray.getInt(R.styleable.EasySeekBar_min_progress,0);             circleColor = typedArray.getColor(R.styleable.EasySeekBar_circle_color,Color.parseColor("#ffffff"));             strokeWidth = typedArray.getInt(R.styleable.EasySeekBar_progress_with,12);         }finally {             typedArray.recycle();         }           centrePoint = new Point();         WHPoint = new Point();         if (circleR<strokeWidth/2){             centrePoint.x = line+strokeWidth/2;             centrePoint.y = line+strokeWidth/2;               WHPoint.x = line+strokeWidth;             WHPoint.y = strokeWidth;         }else {             centrePoint.x = line+circleR;             centrePoint.y = line+circleR;               WHPoint.x = line+2*circleR;             WHPoint.y = 2*circleR;         }         setValue(minProgress);     }       private void initPaint() {         //初始低画笔         bgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);         bgPaint.setAntiAlias(true);         bgPaint.setColor(bgColor);         bgPaint.setStrokeWidth(strokeWidth-2);         bgPaint.setStrokeCap(Paint.Cap.ROUND);           //初始进度画笔         progressPaint = new Paint(Paint.ANTI_ALIAS_FLAG);         progressPaint.setAntiAlias(true);         progressPaint.setColor(progressColor);         progressPaint.setStrokeCap(Paint.Cap.ROUND);         progressPaint.setStrokeWidth(strokeWidth);           //初始小球画笔         circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);         circlePaint.setAntiAlias(true);         circlePaint.setColor(circleColor);           //竖线         linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);         linePaint.setAntiAlias(true);         linePaint.setColor(lineColor);         linePaint.setStrokeWidth(5);         linePaint.setStrokeCap(Paint.Cap.ROUND);       }       @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)     @Override     protected void onDraw(Canvas canvas) {         super.onDraw(canvas);         switch (configuration){             case "horizontal":                 canvas.drawLine(WHPoint.y/2,WHPoint.y/2+space,line+WHPoint.y/2,WHPoint.y/2+space,bgPaint);                 canvas.drawLine(WHPoint.y/2,WHPoint.y/2+space,progress+WHPoint.y/2,WHPoint.y/2+space,progressPaint);                 canvas.drawCircle(progress+WHPoint.y/2,WHPoint.y/2+space,circleR,circlePaint);                 drawLine(canvas); //刻度线                 break;         }     }       //刻度线     private void drawLine(Canvas canvas){         int k = maxProgress - minProgress;         for (int i = 0; i <= k; i++){             if (i != 0 && i != k){                 float x = WHPoint.y/2 + (line/(float)k *i);                 canvas.drawLine(x,2,x,10,linePaint);             }         }     }       @Override     public boolean onTouchEvent(MotionEvent event) {         switch (configuration){             case "horizontal":                 horTouch(event);                 break;         }         return true;     }         private void horTouch(MotionEvent event) {         float x = event.getX();         switch (event.getAction()){             case MotionEvent.ACTION_DOWN:                 getParent().requestDisallowInterceptTouchEvent(true); //                if (!isTure){ //                    getParent().requestDisallowInterceptTouchEvent(true); //                    int point = ((int) x); //                    if (point<0){ //                        point = 0; //                    }else if (point>line){ //                        point = line; //                    } //                    progress = point; //                }                 break;             case MotionEvent.ACTION_MOVE:                 /*int pointX = ((int) x-circleR);                 if (pointX<0){                     pointX = 0;                 }else if (pointX> line){                     pointX = line;                 }                 progress = pointX;*/                 int pointX = ((int) x-circleR);                 if (pointX<0){                     pointX = 0;                 }else if (pointX> line){                     pointX = line;                 }                 Log.i("打印进度值：","pointX = "+pointX + " ,line = "+line);                 progress = pointX;                   break;             case MotionEvent.ACTION_UP:                 getParent().requestDisallowInterceptTouchEvent(false);                   int len = maxProgress - minProgress;                 float dan = line/(float)len;                   float zuiXiao = line;                 int u = len;                 for (int i = 0; i <= len; i++){                     //Log.i("打印i =",""+i);                     float k = dan*i;                     float jue = Math.abs(k- progress);//求绝对值                     if (jue < zuiXiao){                         zuiXiao = jue;                         u = i;                     }                 }                 Log.i("打印进度值zuiXiao：",""+zuiXiao);                 progress = u*dan;                 Log.i("打印进度值uu：",""+u +" ,progress = "+progress +" ,dan = "+dan +" ,line = "+line);                 if (easySeekBarLister != null){                     value = (int)getVHValue(progress);                     Log.i("打印进度值111：",""+value);                     easySeekBarLister.onProgress(value);                 }                 break;         }         invalidate();     }         /**      * @describe 绝对值      * @param i      * @return      */     private int getAbs(int i) {         if (i<0){             i = -i;         }         return i;     }     public int getValue() {         return value;     }       public void setValue(int value) {         if (value < minProgress){             this.value = minProgress;         }else if (value > maxProgress){             this.value = maxProgress;         }else {             this.value = value;         }         progress = ValueToProgress(this.value);         invalidate();     }       private float ValueToProgress(int value) {         switch (configuration){             case "horizontal":                 return progress = (value-minProgress)*line/(maxProgress - minProgress);         }         return minProgress;     }       private float getVHValue(float progress) {         return progress*(maxProgress - minProgress) / line+minProgress;     }       @Override     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {         super.onMeasure(widthMeasureSpec, heightMeasureSpec);         switch (configuration){             case "horizontal":                 setMeasuredDimension(WHPoint.x,WHPoint.y+space);                 break;         }     }       public interface EasySeekBarLister{         void onProgress(int pro);     }   }

3、布局文件

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<com.example.customseekbar.easy.StepSeekBar         android:id="@+id/stepSeekBar"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerHorizontal="true"         android:layout_marginTop="350dp"         app:circle_color="#F6B363"         app:circle_r="8dp"         app:configuration="horizontal"         app:line="300dp"         app:max_progress="8"         app:min_progress="0"         app:progress_bg_color="#F7F1F7"         app:progress_color="#FFDFB8"         app:progress_with="15" />       <TextView         android:id="@+id/tv_step"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginTop="400dp"         android:layout_centerHorizontal="true"></TextView>

4、activity

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public class HorizontalActivity extends AppCompatActivity {       @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_horizontal);           TextView tv_step = findViewById(R.id.tv_step);         StepSeekBar stepSeekBar = findViewById(R.id.stepSeekBar);         stepSeekBar.setEasySeekBarLister(new StepSeekBar.EasySeekBarLister() {             @Override             public void onProgress(int pro) {                 tv_step.setText(""+pro);             }         });           stepSeekBar.setValue(7);         tv_step.setText("7");     } }

5、color文件

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<color name="colorPrimary">#008577</color>  <color name="colorPrimaryDark">#00574B</color>  <color name="colorAccent">#D81B60</color>

　

 

完成