在Android应用中实现GPS定位

     <p>在Android开发与地理位置相关时，经常需要用到经纬度，因为这个的位置比较精确。然后可以转换成我们需要的数据。</p>    <p>直接列出开发实现步骤：</p>    <p>1、业务层实现，通过这个代码可以获得经纬度：</p>    <pre class="brush:java; toolbar: true; auto-links: false;">package org.Base.Utils;   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.util.Log; import android.widget.TextView;   /**  * @author coldwait  * @version  */ public class CoordinateHelper {  public CoordinateHelper(Context context, TextView longitude,    TextView latitude) {   this.context = context;   this.latitude = latitude;   this.longitude = longitude;     setLocationParam();  }    double lat;  double lng;  private LocationManager locationManager;  private Context context;  private TextView longitude;  private TextView latitude;    public String getLatitude() {   return String.valueOf(lat);  }    public String getLongitude() {   return String.valueOf(lng);  }    private void setLocationParam() {   try {    String serviceName = Context.LOCATION_SERVICE;    locationManager = (LocationManager) context      .getSystemService(serviceName);      /*     * locationManager =     * (LocationManager)getSystemService(LOCATION_SERVICE);     *      * String provider=LocationManager.GPS_PROVIDER; Location location =     * locationManager.getLastKnownLocation(provider);     */      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);    Location location = locationManager.getLastKnownLocation(provider);    updateWithNewLocation(location);    // 设置监听器，自动更新的最小时间为间隔1秒，最小位移变化超过5米    locationManager.requestLocationUpdates(provider, 1000, 5,      locationListener);   } catch (Exception e) {    Log.e("Exception", e.getMessage());   }    }    private final LocationListener locationListener = new LocationListener() {     public void onLocationChanged(Location location) {    updateWithNewLocation(location);   }     public void onProviderDisabled(String provider) {    updateWithNewLocation(null);   }     public void onProviderEnabled(String provider) {   }     public void onStatusChanged(String provider, int status, Bundle extras) {   }    };    private void updateWithNewLocation(Location location) {   if (location != null) {    lat = location.getLatitude();    lng = location.getLongitude();   } else {    lat = 0;    lng = 0;   }   latitude.setText(getLatitude());   longitude.setText(getLongitude());  } }</pre>2、设置布局文件main.xml    <pre class="brush:xml; toolbar: true; auto-links: false;"><?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:id="@+id/carregion" android:layout_width="fill_parent"  android:layout_height="fill_parent">     <LinearLayout android:orientation="vertical"    android:layout_alignParentTop="true" android:layout_above="@+id/menu"    android:layout_width="fill_parent" android:layout_height="wrap_content"    android:padding="10dip">    <TableLayout android:layout_width="fill_parent"     android:layout_height="wrap_content" android:paddingLeft="10dip"     android:paddingRight="10dip" android:stretchColumns="0,1"     android:shrinkColumns="1">                        <TableRow android:paddingTop="10dip" android:paddingBottom="10dip">      <TextView android:text="经度：" android:textSize="19sp" />      <TextView android:id="@+id/longitude" android:text=""       android:textSize="18sp" />     </TableRow>          <TableRow android:paddingTop="10dip" android:paddingBottom="10dip">       <TextView android:text="纬度：" android:textSize="19sp" />       <TextView android:id="@+id/latitude" android:text=""        android:textSize="18sp" />     </TableRow>     <TableRow android:paddingTop="10dip" android:paddingBottom="10dip">            <TextView android:id="@+id/pickupdata" android:text="是否采集到坐标:"       android:textSize="18sp" />      <TextView android:id="@+id/ispicked" android:text="否"       android:textSize="18sp" />     </TableRow>    </TableLayout>    </LinearLayout> </RelativeLayout></pre>    <span><span>3、开发Activity文件  <pre class="brush:java; toolbar: true; auto-links: false;">public class QuestionReport extends Activity{         private TextView longitude;//设置显示经度文本框  private TextView latitude;//设置显示纬度文本框  private TextView isPicked;//设置是否捕获到经纬度       public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.question_reported);   location();//通过调用此成员方法,设置经纬度     }  private void location() {   new CoordinateHelper(this, longitude, latitude);   /**    * Set a special listener to be called when an action is performed on the text view.     * This will be called when the enter key is pressed, or when an action supplied to the IME is selected by the user.     * Setting this means that the normal hard key event will not insert a newline into the text view, even if it is multi-line;     * holding down the ALT modifier will, however, allow the user to insert a newline character.     *     * */   latitude.setOnEditorActionListener(new OnEditorActionListener() {     @Override    public boolean onEditorAction(TextView arg0, int arg1, KeyEvent arg2) {     // TODO Auto-generated method stub     return false;    }    });   /**    * Adds a TextWatcher to the list of those whose methods are called     * whenever this TextView's text changes    */   latitude.addTextChangedListener(new TextWatcher() {    @Override    public void afterTextChanged(Editable arg0) {     // TODO Auto-generated method stub     }     @Override    public void beforeTextChanged(CharSequence arg0, int arg1,      int arg2, int arg3) {     // TODO Auto-generated method stub     }    /**     * This method is called to notify you that, within s,      * the count characters beginning at start have just replaced old text that had length before.      * It is an error to attempt to make changes to s from this callback.     */     @Override    public void onTextChanged(CharSequence arg0, int arg1, int arg2,      int arg3) {     // TODO Auto-generated method stub     if ("0.0".equals(longitude.getText().toString())       || "".equals(longitude.getText().toString())) {//如果获取不到纬度或者得到经度为0，则显示是否获得经纬度为否      isPicked.setText("否");     } else {      isPicked.setText("是");     }    }    });   longitude.setOnEditorActionListener(new OnEditorActionListener() {     @Override    public boolean onEditorAction(TextView arg0, int arg1, KeyEvent arg2) {     // TODO Auto-generated method stub     return false;    }    });   longitude.addTextChangedListener(new TextWatcher() {     @Override    public void afterTextChanged(Editable arg0) {     // TODO Auto-generated method stub     }     @Override    public void beforeTextChanged(CharSequence arg0, int arg1,      int arg2, int arg3) {     // TODO Auto-generated method stub     }     @Override    public void onTextChanged(CharSequence arg0, int arg1, int arg2,      int arg3) {     // TODO Auto-generated method stub     if ("0.0".equals(longitude.getText().toString())       || "".equals(longitude.getText().toString())) {////如果获取不到经度或者得到经度为0，则显示是否获得经纬度为否      isPicked.setText("否");     } else {      isPicked.setText("是");     }    }    });  }  }</pre></span></span>    <p></p> 4、为应用程序声明获取位置信息的权限    <pre class="brush:xml; toolbar: true; auto-links: false;"><uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /></pre>