非常好看的android音量旋钮

本文实例为大家分享了好看的android音量旋钮，供大家参考，具体内容如下

效果图：

实现思路，用的自定义的控件,图片和按钮都是自己绘制的，并且附带点击事件，可以监听当前的旋钮的值：

第一步：先把布局写了：

第二步：然后把自定义的控件类写了：AnalogController

 import android.content.Context;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.Paint;
  import android.util.AttributeSet;
  import android.view.MotionEvent;
  import android.view.View;
 
 

public class AnalogController extends View {
 
 static float width, height;
 float midx, midy;
 Paint textPaint;
 Paint circlePaint;
 public Paint circlePaint2;
 public Paint linePaint;
 String angle;
 float currdeg, deg = 3, downdeg, prevCurrDeg;
 boolean isIncreasing, isDecreasing;
 public static int themeColor = Color.parseColor("#B24242");
 
 int progressColor, lineColor;
 
 onProgressChangedListener mListener;
 
 String label;
 
 public interface onProgressChangedListener {
  void onProgressChanged(int progress);
 }
 
 public void setonProgressChangedListener(onProgressChangedListener listener) {
  mListener = listener;
 }
 
 public AnalogController(Context context) {
  super(context);
  init();
 }
 
 public AnalogController(Context context, AttributeSet attrs) {
  super(context, attrs);
  init();
 }
 
 public AnalogController(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  init();
 }
 
 void init() {
  textPaint = new Paint();
  textPaint.setColor(Color.WHITE);
  textPaint.setStyle(Paint.Style.FILL);
  textPaint.setTextSize(20);
  textPaint.setFakeBoldText(true);
  textPaint.setTextAlign(Paint.Align.CENTER);
  circlePaint = new Paint();
  circlePaint.setColor(Color.parseColor("#222222"));
  circlePaint.setStyle(Paint.Style.FILL);
  circlePaint2 = new Paint();
  circlePaint2.setColor(themeColor);
//  circlePaint2.setColor(Color.parseColor("#FFA036"));
  circlePaint2.setStyle(Paint.Style.FILL);
  linePaint = new Paint();
  linePaint.setColor(themeColor);
//  linePaint.setColor(Color.parseColor("#FFA036"));
  linePaint.setStrokeWidth(7);
  angle = "0.0";
  label = "Label";
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  midx = canvas.getWidth() / 2;
  midy = canvas.getHeight() / 2;
 
  int ang = 0;
  float x = 0, y = 0;
  int radius = (int) (Math.min(midx, midy) * ((float) 14.5 / 16));
  float deg2 = Math.max(3, deg);
  float deg3 = Math.min(deg, 21);
  for (int i = (int) (deg2); i < 22; i++) {
   float tmp = (float) i / 24;
   x = midx + (float) (radius * Math.sin(2 * Math.PI * (1.0 - tmp)));
   y = midy + (float) (radius * Math.cos(2 * Math.PI * (1.0 - tmp)));
   circlePaint.setColor(Color.parseColor("#111111"));
   canvas.drawCircle(x, y, ((float) radius / 15), circlePaint);
  }
  for (int i = 3; i <= deg3; i++) {
   float tmp = (float) i / 24;
   x = midx + (float) (radius * Math.sin(2 * Math.PI * (1.0 - tmp)));
   y = midy + (float) (radius * Math.cos(2 * Math.PI * (1.0 - tmp)));
   canvas.drawCircle(x, y, ((float) radius / 15), circlePaint2);
  }
 
  float tmp2 = (float) deg / 24;
  float x1 = midx + (float) (radius * ((float) 2 / 5) * Math.sin(2 * Math.PI * (1.0 - tmp2)));
  float y1 = midy + (float) (radius * ((float) 2 / 5) * Math.cos(2 * Math.PI * (1.0 - tmp2)));
  float x2 = midx + (float) (radius * ((float) 3 / 5) * Math.sin(2 * Math.PI * (1.0 - tmp2)));
  float y2 = midy + (float) (radius * ((float) 3 / 5) * Math.cos(2 * Math.PI * (1.0 - tmp2)));
 
  circlePaint.setColor(Color.parseColor("#222222"));
  canvas.drawCircle(midx, midy, radius * ((float) 13 / 15), circlePaint);
  circlePaint.setColor(Color.parseColor("#000000"));
  canvas.drawCircle(midx, midy, radius * ((float) 11 / 15), circlePaint);
  canvas.drawText(label, midx, midy + (float) (radius * 1.1), textPaint);
  canvas.drawLine(x1, y1, x2, y2, linePaint);
 
 }
 
 @Override
 public boolean onTouchEvent(MotionEvent e) {
 
  mListener.onProgressChanged((int) (deg - 2));
 
  if (e.getAction() == MotionEvent.ACTION_DOWN) {
   float dx = e.getX() - midx;
   float dy = e.getY() - midy;
   downdeg = (float) ((Math.atan2(dy, dx) * 180) / Math.PI);
   downdeg -= 90;
   if (downdeg < 0) {
    downdeg += 360;
   }
   downdeg = (float) Math.floor(downdeg / 15);
   return true;
  }
  if (e.getAction() == MotionEvent.ACTION_MOVE) {
   float dx = e.getX() - midx;
   float dy = e.getY() - midy;
   currdeg = (float) ((Math.atan2(dy, dx) * 180) / Math.PI);
   currdeg -= 90;
   if (currdeg < 0) {
    currdeg += 360;
   }
   currdeg = (float) Math.floor(currdeg / 15);
 
   if (currdeg == 0 && downdeg == 23) {
    deg++;
    if (deg > 21) {
     deg = 21;
    }
    downdeg = currdeg;
   } else if (currdeg == 23 && downdeg == 0) {
    deg--;
    if (deg < 3) {
     deg = 3;
    }
    downdeg = currdeg;
   } else {
    deg += (currdeg - downdeg);
    if (deg > 21) {
     deg = 21;
    }
    if (deg < 3) {
     deg = 3;
    }
    downdeg = currdeg;
   }
 
   angle = String.valueOf(String.valueOf(deg));
   invalidate();
   return true;
  }
  if (e.getAction() == MotionEvent.ACTION_UP) {
   return true;
  }
  return super.onTouchEvent(e);
 }
 
 public int getProgress() {
  return (int) (deg - 2);
 }
 
 public void setProgress(int x) {
  deg = x + 2;
 }
 
 public String getLabel() {
  return label;
 }
 
 public void setLabel(String txt) {
  label = txt;
 }
 
 public int getLineColor() {
  return lineColor;
 }
 
 public void setLineColor(int lineColor) {
  this.lineColor = lineColor;
 }
 
 public int getProgressColor() {
  return progressColor;
 }
 
 public void setProgressColor(int progressColor) {
  this.progressColor = progressColor;
 }
}

第三步：在MainActivity中，我们去写监听方法，查看旋钮的值：

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
 
 

 
public class TextActivity extends Activity {
 AnalogController bassController;
 public static int themeColor = Color.parseColor("#B24242");
 private TextView tv;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 
  bassController = (AnalogController) findViewById(R.id.controllerBass);
  tv = (TextView)findViewById(R.id.tv);
 
  bassController.setLabel("BASS");
 
  bassController.circlePaint2.setColor(themeColor);
  bassController.linePaint.setColor(themeColor);
  bassController.invalidate();
  bassController.linePaint.setColor(themeColor);
 
  bassController.setonProgressChangedListener(new AnalogController.onProgressChangedListener() {
   @Override
   public void onProgressChanged(int progress) {
    tv.setText(progress+"");
   }
  });
 
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。