Android仿小米指南针功能

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 ·

2021-05-14 02:13

效果图:


实现步骤:


1、第一步新建一个calss,就起名叫Mi吧。一会用来绘制自定义View


  • 颜色样式colors.xml的文件

<?xml version="1.0" encoding="utf-8"?><resources>    <color name="colorPrimary">#3F51B5</color>    <color name="colorPrimaryDark">#303F9F</color>    <color name="colorAccent">#FF4081</color>    <color name="black">#000</color>    <color name="darkRed">#702216</color>    <color name="lightGray">#323232</color>    <color name="deepGray">#8B8B8B</color>    <color name="white">#fff</color>    <color name="red">#f00</color>    <color name="ocbg">#237EAD</color></resources>


  • 画指南针外圈

    /**     * 指南针外部可简单分为两部分     * 1、用Path实现小三角形     * 2、两个圆弧     */    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)    private void drawCompassOutSide() {        mCanvas.save();        //小三角形的高度        int mTriangleHeight=40;        //定义Path画小三角形        mOutsideTriangle.moveTo(width/2,mTextHeight-mTriangleHeight);        //小三角形的边长        float mTriangleSide = 46.18f;        //画出小三角形        mOutsideTriangle.lineTo(width/2-mTriangleSide/2,mTextHeight);        mOutsideTriangle.lineTo(width/2+mTriangleSide/2,mTextHeight);        mOutsideTriangle.close();        mCanvas.drawPath(mOutsideTriangle,mOutSideCircumPaint);
//画圆弧 mDarkRedPaint.setStrokeWidth((float) 5); mLightGrayPaint.setStrokeWidth((float)5); mDeepGrayPaint.setStrokeWidth((float)3); mLightGrayPaint.setStyle(Paint.Style.STROKE); mCanvas.drawArc(width/2-mOutSideRadius,mTextHeight,width/2+mOutSideRadius,mTextHeight+mOutSideRadius*2,-80,120,false,mLightGrayPaint); mCanvas.drawArc(width/2-mOutSideRadius,mTextHeight,width/2+mOutSideRadius,mTextHeight+mOutSideRadius*2,40,20,false,mDeepGrayPaint); mCanvas.drawArc(width/2-mOutSideRadius,mTextHeight,width/2+mOutSideRadius,mTextHeight+mOutSideRadius*2,-100,-20,false,mLightGrayPaint); mCanvas.drawArc(width/2-mOutSideRadius,mTextHeight,width/2+mOutSideRadius,mTextHeight+mOutSideRadius*2,-120,-120,false,mDarkRedPaint); mCanvas.restore(); }


  • 画指南针外接圆

    /**     * 指南针外接圆,和外部圆换道理差不多     */    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)    private void drawCompassCircum() {        mCanvas.save();        //外接圆小三角形的高度        int mTriangleHeight=(mOutSideRadius-mCircumRadius)/2;
mCanvas.rotate(-val,width/2,mOutSideRadius+mTextHeight); mCircumTriangle.moveTo(width/2,mTriangleHeight+mTextHeight); //内接三角形的边长,简单数学运算 float mTriangleSide = (float) ((mTriangleHeight/(Math.sqrt(3)))*2); mCircumTriangle.lineTo(width/2-mTriangleSide/2,mTextHeight+mTriangleHeight*2); mCircumTriangle.lineTo(width/2+mTriangleSide/2,mTextHeight+mTriangleHeight*2); mCircumTriangle.close(); mCanvas.drawPath(mCircumTriangle,mCircumPaint); mCanvas.drawArc(width/2-mCircumRadius,mTextHeight+mOutSideRadius-mCircumRadius, width/2+mCircumRadius,mTextHeight+mOutSideRadius+mCircumRadius,-85,350,false,mDeepGrayPaint); mAnglePaint.setStrokeWidth(5f); if (val<=180){ valCompare = val; mCanvas.drawArc(width/2-mCircumRadius,mTextHeight+mOutSideRadius-mCircumRadius, width/2+mCircumRadius,mTextHeight+mOutSideRadius+mCircumRadius,-85,valCompare,false,mAnglePaint); }else{ valCompare = 360-val; mCanvas.drawArc(width/2-mCircumRadius,mTextHeight+mOutSideRadius-mCircumRadius, width/2+mCircumRadius,mTextHeight+mOutSideRadius+mCircumRadius,-95,-valCompare,false,mAnglePaint); }
mCanvas.restore(); }


  • 画内部渐变颜色圆

 private void drawInnerCricle() {
mInnerShader = new RadialGradient(width/2,mOutSideRadius+mTextHeight,mCircumRadius-40, Color.parseColor("#323232"), Color.parseColor("#000000"),Shader.TileMode.CLAMP); mInnerPaint.setShader(mInnerShader);        mCanvas.drawCircle(width/2,mOutSideRadius+mTextHeight,mCircumRadius-40,mInnerPaint); }


  • 画指南针内部刻度

  private void drawCompassDegreeScale() {        mCanvas.save();        //获取N文字的宽度        mNorthPaint.getTextBounds("N",0,1,mPositionRect);        int mPositionTextWidth = mPositionRect.width();        int mPositionTextHeight = mPositionRect.height();        //获取W文字宽度,因为W比较宽 所以要单独获取        mNorthPaint.getTextBounds("W",0,1,mPositionRect);        int mWPositionTextWidth = mPositionRect.width();        int mWPositionTextHeight = mPositionRect.height();        //获取小刻度,两位数的宽度        mSamllDegreePaint.getTextBounds("30",0,1,mSencondRect);        int mSencondTextWidth = mSencondRect.width();        int mSencondTextHeight = mSencondRect.height();        //获取小刻度,3位数的宽度        mSamllDegreePaint.getTextBounds("30",0,1,mThirdRect);        int mThirdTextWidth = mThirdRect.width();        int mThirdTextHeight = mThirdRect.height();
mCanvas.rotate(-val,width/2,mOutSideRadius+mTextHeight);

//画刻度线 for (int i = 0; i < 240; i++) {
if (i==0||i==60||i==120||i==180){ mCanvas.drawLine(getWidth() / 2, mTextHeight+mOutSideRadius-mCircumRadius+10, getWidth() / 2, mTextHeight+mOutSideRadius-mCircumRadius+30, mDeepGrayPaint); }else{ mCanvas.drawLine(getWidth() / 2, mTextHeight+mOutSideRadius-mCircumRadius+10, getWidth() / 2, mTextHeight+mOutSideRadius-mCircumRadius+30, mLightGrayPaint); } if (i==0){ mCanvas.drawText("N", this.width /2-mPositionTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mPositionTextHeight,mNorthPaint); }else if (i==60){ mCanvas.drawText("E", this.width /2-mPositionTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mPositionTextHeight,mOthersPaint); }else if (i==120){ mCanvas.drawText("S", this.width /2-mPositionTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mPositionTextHeight,mOthersPaint); }else if (i==180){ mCanvas.drawText("W", this.width /2-mWPositionTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mWPositionTextHeight,mOthersPaint); }else if (i==20){ mCanvas.drawText("30", this.width /2-mSencondTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mSencondTextHeight,mSamllDegreePaint); }else if (i==40){ mCanvas.drawText("60", this.width /2-mSencondTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mSencondTextHeight,mSamllDegreePaint); }else if (i==80){ mCanvas.drawText("120", this.width /2-mThirdTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mThirdTextHeight,mSamllDegreePaint); }else if (i==100){ mCanvas.drawText("150", this.width /2-mThirdTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mThirdTextHeight,mSamllDegreePaint); }else if (i==140){ mCanvas.drawText("210", this.width /2-mThirdTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mThirdTextHeight,mSamllDegreePaint); }else if (i==160){ mCanvas.drawText("240", this.width /2-mThirdTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mThirdTextHeight,mSamllDegreePaint); }else if (i==200){ mCanvas.drawText("300", this.width /2-mThirdTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mThirdTextHeight,mSamllDegreePaint); }else if (i==220){ mCanvas.drawText("330", this.width /2-mThirdTextWidth/2,mTextHeight+mOutSideRadius-mCircumRadius+40+mThirdTextHeight,mSamllDegreePaint); } mCanvas.rotate(1.5f, mCenterX, mOutSideRadius+mTextHeight); } mCanvas.restore(); }


2、在xml文件中使用自定义控件

 <com.example.customviewdemo.Mi        android:id="@+id/miui"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@color/black" />


3、写调用方向传感器的代码

public class MainActivity extends AppCompatActivity {    private SensorManager sensorManager;    private SensorEventListener sensorEventListener;    private Mi miui;    private float val;
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
miui = findViewById(R.id.miui); //传感器 sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); //传感器监听 sensorEventListener = new SensorEventListener() { @Override public void onSensorChanged(SensorEvent event) { val = event.values[0]; miui.setVal(val); }
@Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } };
//注册传感器服务 sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_GAME); }
@Override protected void onDestroy() { super.onDestroy(); //取消注册传感器服务 sensorManager.unregisterListener(sensorEventListener); }}


到这里就介绍完了,需要完整源码的童鞋可以在【龙旋】对话框发送【小米指南针】即能获取。

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