如何在android中制作自定义指南针视图

概述我正在使用一个简单的罗盘应用程序.我需要设置罗盘视图和传感器活动,我选择罗盘视图类.但它只是为罗盘视图画一个圆圈和一条线.我需要通过将此圆和线替换为我自己的可绘制图像来自定义此视图,有人请帮我修复此问题. 我的观点课 import android.content.Context;import android.graphics.Canvas;import android.graphics.Col 我正在使用一个简单的罗盘应用程序.我需要设置罗盘视图和传感器活动,我选择罗盘视图类.但它只是为罗盘视图画一个圆圈和一条线.我需要通过将此圆和线替换为我自己的可绘制图像来自定义此视图,有人请帮我修复此问题.

我的观点课

import androID.content.Context;import androID.graphics.Canvas;import androID.graphics.color;import androID.graphics.Paint;import androID.vIEw.VIEw;public class MyCompassVIEw extends VIEw {  private Paint paint;  private float position = 0;  public MyCompassVIEw(Context context) {    super(context);    init();  }  private voID init() {    paint = new Paint();    paint.setAntiAlias(true);    paint.setstrokeWIDth(2);    paint.setTextSize(25);    paint.setStyle(Paint.Style.stroke);    paint.setcolor(color.WHITE);  }  @OverrIDe  protected voID onDraw(Canvas canvas) {    int xPoint = getMeasureDWIDth() / 2;    int yPoint = getMeasuredHeight() / 2;    float radius = (float) (Math.max(xPoint,yPoint) * 0.6);    canvas.drawCircle(xPoint,yPoint,radius,paint);    canvas.drawRect(0,getMeasureDWIDth(),getMeasuredHeight(),paint);    // 3.143 is a good approximation for the circle    canvas.drawline(xPoint,(float) (xPoint + radius            * Math.sin((double) (-position) / 180 * 3.143)),(float) (yPoint - radius            * Math.cos((double) (-position) / 180 * 3.143)),paint);    canvas.drawText(String.valueOf(position),xPoint,paint);  }  public voID updateData(float position) {    this.position = position;    invalIDate();  }}

解决方法 上述代码已被弃用.更新的代码可用 here

XML布局activty_main

<relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:background="#fff" >    <TextVIEw        androID:ID="@+ID/tvheading"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:layout_centerHorizontal="true"        androID:layout_marginBottom="40dp"        androID:layout_margintop="20dp"        androID:text="heading: 0.0" />    <ImageVIEw        androID:ID="@+ID/imageVIEwCompass"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:layout_below="@+ID/tvheading"        androID:layout_centerHorizontal="true"        androID:src="@drawable/img_compass" /></relativeLayout>

主要活动

public class MainActivity extends Activity implements SensorEventListener {    // define the display assembly compass picture    private ImageVIEw image;    // record the compass picture angle turned    private float currentDegree = 0f;    // device sensor manager    private SensorManager mSensorManager;    TextVIEw tvheading;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        //         image = (ImageVIEw) findVIEwByID(R.ID.main_iv);        // TextVIEw that will tell the user what degree is he heading        tvheading = (TextVIEw) findVIEwByID(R.ID.tvheading);        // initialize your androID device sensor capabilitIEs        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);    }    @OverrIDe    protected voID onResume() {        super.onResume();        // for the system's orIEntation sensor registered Listeners        mSensorManager.registerListener(this,mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),SensorManager.SENSOR_DELAY_GAME);    }    @OverrIDe    protected voID onPause() {        super.onPause();        // to stop the Listener and save battery        mSensorManager.unregisterListener(this);    }    @OverrIDe    public voID onSensorChanged(SensorEvent event) {        // get the angle around the z-axis rotated        float degree = Math.round(event.values[0]);        tvheading.setText("heading: " + float.toString(degree) + " degrees");        // create a rotation animation (reverse turn degree degrees)        RotateAnimation ra = new RotateAnimation(                currentDegree,-degree,Animation.relative_TO_SELF,0.5f,0.5f);        // how long the animation will take place        ra.setDuration(210);        // set the animation after the end of the reservation status        ra.setFillAfter(true);        // Start the animation        image.startAnimation(ra);        currentDegree = -degree;    }    @OverrIDe    public voID onAccuracyChanged(Sensor sensor,int accuracy) {        // not in use    }}

总结

以上是内存溢出为你收集整理的如何在android中制作自定义指南针视图全部内容，希望文章能够帮你解决如何在android中制作自定义指南针视图所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。