在Android應用中實現GPS定位

fmms 12年前發布 | 35K 次閱讀 Android Android開發移動開發
在Android開發與地理位置相關時，經常需要用到經緯度，因為這個的位置比較精確。然后可以轉換成我們需要的數據。
直接列出開發實現步驟：
1、業務層實現，通過這個代碼可以獲得經緯度：
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);
        // 設置監聽器，自動更新的最小時間為間隔1秒，最小位移變化超過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、設置布局文件main.xml 
  
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android&quot;
    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="經度：" android:textSize="19sp" />
                <TextView android:id="@+id/longitude" android:text=""
                    android:textSize="18sp" />
            </TableRow>

            <TableRow android:paddingTop="10dip" android:paddingBottom="10dip">
                    <TextView android:text="緯度：" 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="是否采集到坐標:"
                    android:textSize="18sp" />
                <TextView android:id="@+id/ispicked" android:text="否"
                    android:textSize="18sp" />
            </TableRow>
        </TableLayout>
        </LinearLayout>

</RelativeLayout></pre> 
  3、開發Activity文件  
public class QuestionReport extends Activity{
        private TextView longitude;//設置顯示經度文本框
    private TextView latitude;//設置顯示緯度文本框
    private TextView isPicked;//設置是否捕獲到經緯度
      public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.question_reported);
        location();//通過調用此成員方法,設置經緯度

}
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())) {//如果獲取不到緯度或者得到經度為0，則顯示是否獲得經緯度為否
                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())) {////如果獲取不到經度或者得到經度為0，則顯示是否獲得經緯度為否
                isPicked.setText("否");
            } else {
                isPicked.setText("是");
            }
        }

    });
}


}</pre></span></span> 
  
 4、為應用程序聲明獲取位置信息的權限 
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
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Android Android開發移動開發
在Android應用中實現GPS定位

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