本文例項為大家分享了好看的android音量旋鈕，供大家參考，具體內容如下

效果圖：

實現思路，用的自定義的控制元件,圖片和按鈕都是自己繪製的，並且附帶點選事件，可以監聽當前的旋鈕的值：

第一步：先把佈局寫了：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:background="#000000"
 android:layout_width="match_parent"
 android:gravity="center"
 android:layout_height="match_parent">
 <TextView
  android:id="@+id/tv"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:textColor="#ffffff"
  />
 <LinearLayout
  android:layout_width="300dp"
  android:layout_height="300dp"
  android:layout_marginBottom="10dp"
  android:orientation="horizontal">
 
  <com.example.longshine.zname.AnalogController
   android:id="@+id/controllerBass"
   android:layout_width="0dp"
   android:layout_height="match_parent"
   android:layout_weight="1"
   android:background="#000000" />
 
 </LinearLayout>
 
 
</LinearLayout>

第二步：然後把自定義的控制元件類寫了：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;
 
 
/**
 * Created by Harjot on 23-May-16.
 */
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,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,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，我們去寫監聽方法，檢視旋鈕的值：

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
 
 
/**
 * Created by 16857 on 2019/4/12.
 */
 
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內容，希望對大家的學習有所幫助，也希望大家多多支援我們。