试图使图像代表人的位置，但不确定如何将变量 x 和 y 传递到 onDraw ...
我让它检索我的位置，然后绘制符号，它以前在我只有数字时工作
package com.corey.navigationtest;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.FrameLayout.LayoutParams;
import android.widget.Toast;
public class MainActivity extends Activity {
private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 5; // in Meters
private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds
protected LocationManager locationManager;
protected Button retrieveLocationButton;
protected Button buttonSend;
Canvas canvas; //Your canvas to draw on
LinearLayout myLayout; //The layout that holds the surfaceview
SurfaceView surface;
SurfaceHolder surfaceHolder;
public double oldlat = 0;
public double oldlong = 0;
public double newlat;
public double newlong;
public int count = 0;
DisplayMetrics metrics;
int width;
int height;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
retrieveLocationButton = (Button) findViewById(R.id.retrieve_location_button);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);
locationManager.requestLocationUpdates(
provider,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
new MyLocationListener()
);
buttonSend = (Button) findViewById(R.id.buttonSend);
retrieveLocationButton.setOnClickListener(onClickListener);
buttonSend.setOnClickListener(onClickListener);
myLayout = (LinearLayout) findViewById(R.id.myLayout);
LinearLayout.LayoutParams params_surfaceCanvas = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
surface = new SurfaceView(this);
surface.setLayoutParams(params_surfaceCanvas);
//Assign a surfaceholder to the surface
surfaceHolder = surface.getHolder();
myLayout.addView(surface);
canvas = new Canvas();
metrics = this.getResources().getDisplayMetrics();
width = metrics.widthPixels;
height = metrics.heightPixels;
}
private OnClickListener onClickListener = new OnClickListener () {
@Override
public void onClick(final View v) {
switch(v.getId()) {
case R.id.buttonSend:
Location location = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
String phoneNo = "8473027766";
String sms = String.format(
"Current Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
try {
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(phoneNo, null, sms, null, null);
Toast.makeText(getApplicationContext(), "SMS Sent!",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(getApplicationContext(),
"SMS failed, please try again later!",
Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
break;
case R.id.retrieve_location_button:
showCurrentLocation();
break;
}
}
};
protected void showCurrentLocation() {
Location location = locationManager.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);
if (location != null) {
String message = String.format(
"Current Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
Toast.makeText(MainActivity.this, message,
Toast.LENGTH_SHORT).show();
}
}
private class MyLocationListener implements LocationListener {
public void onLocationChanged(Location location) {
newlat = location.getLatitude();
newlong = location.getLatitude();
String message1 = String.format(
"New Location \n Longitude: %1$s \n Latitude: %2$s",
location.getLongitude(), location.getLatitude()
);
Toast.makeText(MainActivity.this, message1,
Toast.LENGTH_SHORT).show();
这些是我想要制作图像坐标的变量：
double x;
double y;
x = ((newlong - (-81.366553))/.003803)*width;
y = ((newlat - 41.273816)/.001709)*height;
这是其余的代码
if ((newlat < 41.274871 & newlong > -81.3659) & (oldlong < -81.3659 || oldlat > 41.274871)) {
String phoneNo = "8473027766";
count++;
String sms = String.format(
"You are behind enemy lines \n Longitude: %1$s \n Latitude: %2$s \n Count: %3$s",
location.getLongitude(), location.getLatitude(), count
);
try {
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(phoneNo, null, sms, null, null);
Toast.makeText(getApplicationContext(), "SMS Sent!",
Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(getApplicationContext(),
"SMS failed, please try again later!",
Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
onDraw();
oldlat = newlat;
oldlong = newlong;
}
public void onStatusChanged(String s, int i, Bundle b) {
Toast.makeText(MainActivity.this, "Provider status changed",
Toast.LENGTH_SHORT).show();
}
public void onProviderDisabled(String s) {
Toast.makeText(MainActivity.this,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_SHORT).show();
}
public void onProviderEnabled(String s) {
Toast.makeText(MainActivity.this,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_SHORT).show();
}
}
public void onDraw() {
//Starts a thread
new Thread(new Runnable() {
public void run() {
while(true) {
//Loops until surfaceHolder is valid to use
if (surfaceHolder.getSurface().isValid()) {
Log.i("Drawing","Drawing");
//Always lock the canvas if you want to draw in surfaceview
canvas = surfaceHolder.lockCanvas();
Bitmap image2 = BitmapFactory.decodeResource(getResources(), R.drawable.vertical);
Bitmap image1 = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
canvas.drawColor(Color.WHITE); //The background color of the canvas
canvas.drawBitmap(image2,0,0, null);
canvas.drawBitmap(image1, x, y, null);
//Don't forget to unlock it after you draw in the surfaceview
surfaceHolder.unlockCanvasAndPost(canvas);
//breaks the while and end the thread.
break;
}
}
}
}).start();
}