Trying to make an image represent the person's location, but not sure how to pass the variables x and y into the onDraw...
试图使图像代表人的位置,但不确定如何将变量x和y传递给onDraw ...
I have it retrieving my location then drawing the symbol and it worked previously when i had just numbers inside the
我有它检索我的位置,然后绘制符号,它之前工作,当我只有数字内
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();
These are the variables I want to make the coordinates of the image:
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;
And heres the rest of the code
并且继承了其余的代码
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();
}
1 个解决方案
#1
0
You should use an ImageView for each of your images. This would make everything easy, since you would simply call setX(...) and setY(...), and your app will automatically redraw your image in the right location.
您应该为每个图像使用ImageView。这将使一切变得简单,因为您只需调用setX(...)和setY(...),您的应用程序将自动在正确的位置重绘您的图像。
It would also greatly reduce the memory and time needed for your onDraw() method to perform - since as it is currently creating new bitmaps every time (and not destroying the old ones), your app will not last too many clicks.
它还可以大大减少onDraw()方法执行所需的内存和时间 - 因为它每次都在创建新的位图(而不是破坏旧的位图),因此您的应用不会持续太多点击。
#1
0
You should use an ImageView for each of your images. This would make everything easy, since you would simply call setX(...) and setY(...), and your app will automatically redraw your image in the right location.
您应该为每个图像使用ImageView。这将使一切变得简单,因为您只需调用setX(...)和setY(...),您的应用程序将自动在正确的位置重绘您的图像。
It would also greatly reduce the memory and time needed for your onDraw() method to perform - since as it is currently creating new bitmaps every time (and not destroying the old ones), your app will not last too many clicks.
它还可以大大减少onDraw()方法执行所需的内存和时间 - 因为它每次都在创建新的位图(而不是破坏旧的位图),因此您的应用不会持续太多点击。