Question

问题：创建一个可以显示设备位置精度的仪表，但这里的挑战是它像速度计一样运行，然后更改onLocationChanged

使用的工具：

Numetriclabz readymade Gauge Chart
Android Studio

算法

获得角度：在这里，我只设置300米作为最低精度

 float getDistance = location.getAccuracy() / 300;
 int mAngle = Math.round(180 - (getDistance * 180));

代码

package com.numetriclabz.gaugemap;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.numetriclabz.numandroidcharts.ChartData;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements LocationListener{

    private static TextView accuracyTxt;
    private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 0; // in Meters
    private static final long MINIMUM_TIME_BETWEEN_UPDATES = 0; // in Milliseconds // 5 Seconds
    private LocationManager locationManager;
    private static Context context;
    private static GChart gauge;
    private static LinearLayout gChart;
    private static List values = new ArrayList<>();
    private static Location location = null;
    private static Handler handler = new Handler();
    private static int timerCount = 2;
    private static  float getDistance;
    private static int mAngle;
    private static ArrayList<GChart> graphView = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        accuracyTxt = (TextView)findViewById(R.id.accuracyTxt);
        context = this;
        gauge = new GChart(context,null);
        gChart = (LinearLayout)findViewById(R.id.gChart);
        values.add(new ChartData(60f));
        values.add(new ChartData(60f));
        values.add(new ChartData(60f));
        gauge.setData(values);
        locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER,
                MINIMUM_TIME_BETWEEN_UPDATES,
                MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
                this
        );
    }

    @Override
    public void onLocationChanged(Location location) {
        if(location != null && timerCount == 2){
            this.location = location;
            runnable.run();
        }
    }

    @Override
    public void onStatusChanged(String s, int i, Bundle bundle) {

    }

    @Override
    public void onProviderEnabled(String s) {

    }

    @Override
    public void onProviderDisabled(String s) {

    }

    public static Runnable runnable = new Runnable() {
        @Override
        public void run() {
            try{
                timerCount--;
                handler.postDelayed(this,1000);

                if(timerCount == -1){
                    getDistance = location.getAccuracy() / 300;
                    mAngle = Math.round(180 - (getDistance * 180));

                    if(graphView.isEmpty()){
                        gauge.setAngle(mAngle);
                        gauge.invalidate();
                        gauge.refreshDrawableState();
                        gChart.addView(gauge);
                        graphView.add(gauge);
                        gChart.invalidate();
                    }else{
                        gauge.setAngle(mAngle);
                        gauge.invalidate();
                    }

                    accuracyTxt.setText(String.valueOf(location.getAccuracy()));
                    timerCount = 2;
                    handler.removeCallbacks(runnable);
                }

            }catch (Exception e){
                e.printStackTrace();
            }
        }
    };

}

问题：代码正在运行，但经常更新视图是指针不会勾选的问题如果我更新GaugeChart值它不会更新我的仪表图表中的角度我的问题。

使用过的想法我曾经使用gChart.removeAllViews（）方法更新了我的图表，但它不是用户要求，因为它应该像速度计一样操作，更新值，只是重新创建视图。

Here is a link to my android project file

希望你最重要的考虑。欢呼声。

Android：更新Gauge Chart onLocationChanged

0 个答案: