我正在尝试连接一个按钮,按下按钮时会显示纬度和经度。它似乎没有工作,似乎无法弄清楚为什么。任何帮助将不胜感激。
ShowActivityLocation.java:
package com.democo.android.locationapi.simple;
import java.io.BufferedReader;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class ShowLocationActivity extends Activity implements LocationListener {
private TextView latitudeField;
private TextView longitudeField;
private LocationManager locationManager;
private String provider;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_location); // Your main activity
latitudeField = (TextView) findViewById(R.id.TextView02);
longitudeField = (TextView) findViewById(R.id.TextView04);
StrictMode.ThreadPolicy policy = new
StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the location provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
} else {
latitudeField.setText("Location not available");
longitudeField.setText("Location not available");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
Button btngetLoc = (Button) findViewById(R.id.getLoc);
btngetLoc.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
onLocationChanged();
}
});
return true;
}
/* Request updates at startup */
@Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
/* Remove the locationlistener updates when Activity is paused */
@Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
@Override
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
latitudeField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
new Thread(new Runnable() {
@Override
public void run() {
sendPosToServer(location.getLatitude(), location.getLongitude());
}
}).run();
}
public void sendPosToServer(double lat, double lon) {
URL url;
HttpURLConnection conn;
BufferedReader rd;
String fullURL="http://10.0.2.2:8080/LocationRecorder/UploadLocation'lat='+lat+'lon='+lon";
try {
Log.i(“SendPos”,"Sending request for sensor data to: "+fullURL);
url = new URL(fullURL);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// Issue the GET to send the data
rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
// read the result to process response and ensure data sent
while ((line = rd.readLine()) != null) {
result += line;
}
rd.close();
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderDisabled(String provider) {
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
}
布局XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40dip"
android:orientation="horizontal" >
<TextView
android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:layout_marginRight="5dip"
android:text="Latitude: "
android:textSize="20dip" >
</TextView>
<TextView
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="unknown"
android:textSize="20dip" >
</TextView>
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/TextView03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:layout_marginRight="5dip"
android:text="Longitude: "
android:textSize="20dip" >
</TextView>
<TextView
android:id="@+id/TextView04"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="unknown"
android:textSize="20dip" >
</TextView>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<Button
android:id="@+id/getLoc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Location"
android:onClick="clickFunc"
/>
</LinearLayout>
答案 0 :(得分:1)
对于初学者,您的按钮不在布局页面线性布局中,
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:id="@+id/linearLayout1" >
</LinearLayout>
<LinearLayout
android:id="@+id/linearLayout2">
</LinearLayout>
<LinearLayout >
<Button
android:id="@+id/getLoc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Get Location"
//android:onClick="clickFunc"
/>
</LinearLayout>
// Add this
</LinearLayout>
此外,您需要将此添加到您的onCreate方法,将其从onCreateOptionsMenu()中取出
然后在oncreate()中:
Button btngetLoc = (Button) findViewById(R.id.getLoc);
.../...
});
如上所述删除android:onClick="clickFunc"
,因为您没有此方法,并且您已为该按钮创建了onclicklistener。
你打电话:
onLocationChanged();
参数Location location
public void onLocationChanged(Location location) {
所以以下代码都不起作用:
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
latitudeField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
我倾向于将Location location
一个类变量初始化为null(默认情况下),然后在使用位置检查的方法中
if(location!=null)
除此之外,我认为如果你让这个工作到这个阶段,我建议问一个新问题,因为它有点长。分别尝试和处理以下两个问题:
如何获取您的位置(测试/记录它以查看您是否获得了位置)
在线交流(运行单独的测试以查看您的通信代码是否正常工作)
您会发现这更容易调试。
因此,如果您的应用在编辑后仍然崩溃,我建议您发布create a Minimal, Complete, and Verifiable example。正如我在屏幕截图中注意到的那样,你在整个地方都在改变你的代码,在这种情况下无法回答。
请包含您的logcat。
答案 1 :(得分:0)
正如cw fei所说,你已经设置了OnClickListener
所以你应该从XML文件中删除定义。
此外,您似乎在按下按钮时呼叫onLocationChanged()
。这将没有实际效果,因为每次GPS位置更改时都会调用此方法。反过来,这会在您的位置发生变化时拨打sendPosToServer()
。
也许您想在按下按钮时调用sendPosToServer()
,只需让onLocationChanged()
将新的long和lat存储在类变量中?
答案 2 :(得分:0)
你使用Thread.run(),它将阻止UI线程。你应该使用Thread.start();