android GPS开发实践

1.打开GPS并监听，实时显示坐标信息。

（1）获得GPS系统服务

LocationManager locationManager = (LocationManager) this.getSystemService(this.LOCATION_SERVICE);

(2) 检查GPS开启与否的状态。

locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)

（3）监听获取当前经纬度

     locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0,new LocationListener() {@Overridepublic void onStatusChanged(String provider, int status, Bundle extras) {// TODO Auto-generated method stub}@Overridepublic void onProviderEnabled(String provider) {// TODO Auto-generated method stub}@Overridepublic void onProviderDisabled(String provider) {// TODO Auto-generated method stub}@Overridepublic void onLocationChanged(Location location) {tv.setText(location.getLatitude()+"  "+location.getLongitude());}} );

2.通过GPS获取位置

 // 查找到服务信息        Criteria criteria = new Criteria();        criteria.setAccuracy(Criteria.ACCURACY_FINE); // 高精度        criteria.setAltitudeRequired(false);        criteria.setBearingRequired(false);        criteria.setCostAllowed(true);        criteria.setPowerRequirement(Criteria.POWER_LOW); // 低功耗*/        String provider = locationManager.getBestProvider(criteria, true); // 获取GPS信息        Location location = locationManager.getLastKnownLocation(provider); // 通过GPS获取位置

3. 自动开启GPS

必须将apk push system/app目录下面才可以。

Settings.Secure.setLocationProviderEnabled( getContentResolver(), LocationManager.GPS_PROVIDER, true);

          <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS"/>

可以通过下面这个apk把另外一个apk安装到system/app目录下

public class InstallActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        String paramString= "$ adb push MySMS.apk /sdcard/" +"\n"+                "$ adb shell" +"\n"+                "$ su" +"\n"+                "# mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system" +"\n"+                "# cat /sdcard/MySMS.apk > /system/app/MySMS.apk" +"\n"+                "# mount -o remount,ro -t yaffs2 /dev/block/mtdblock3 /system" +"\n"+                "# exit" +"\n"+                "$ exit";                if(RootCmd.haveRoot()){            if(RootCmd.execRootCmdSilent(paramString)==-1){                Toast.makeText(this, "安装不成功", Toast.LENGTH_LONG).show();            }else{                Toast.makeText(this, "安装成功", Toast.LENGTH_LONG).show();            }        }else{            Toast.makeText(this, "没有root权限", Toast.LENGTH_LONG).show();        }                    }}

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