actionpan/location

app定位

Android 6.0运行时权限简单封装和定位（系统的和google play service的）

这里简单讲解一下：

首先来讲一下android6.0运行时权限的简单封装做法：

每个项目应该都有一个BaseActivity，我们把运行时权限封装在BaseActivity，代码如下：

public static void requestRuntimePermission(String[] permissions, PermissionListener listener) { Activity topActivity = ActivityCollector.getTopActivity(); if (topActivity == null) { return; } mListener = listener; List<String> permissionList = new ArrayList<>(); for (String permission : permissions) { if (ContextCompat.checkSelfPermission(topActivity, permission) != PackageManager.PERMISSION_GRANTED) { permissionList.add(permission); } } if (!permissionList.isEmpty()) { ActivityCompat.requestPermissions(topActivity, permissionList.toArray(new String[permissionList.size()]), 1); } else { mListener.onGranted(); } }

简单说下上面的代码，创建一个permissionList来把一个或者多个权限add进去，通过checkSelfPermission检测权限再进行add进去再去请求权限，如果是6.0以下的就直接回调我们写好的接口mListener.onGranted();进行下一步

 然后就是请求权限的回调了：

@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); switch (requestCode) { case 1: if (grantResults.length > 0) { List<String> deniedPermission = new ArrayList<>(); for (int i = 0; i < grantResults.length; i++) { int grantResult = grantResults[i]; String permission = permissions[i]; if (grantResult != PackageManager.PERMISSION_GRANTED) { deniedPermission.add(permission); } } if (deniedPermission.isEmpty()) { mListener.onGranted(); } else { mListener.onDenied(deniedPermission); } } default: break; } }

如果grantResults>0代表有请求权限，然后新建一个deniedPermissionList来装上回调失败的权限，如果deniedPermission回调权限为空就直接下一步工作mListener.onGranted();，不然就回调所失败的权限mListener.onDenied(deniedPermission);

 在MainActivity中使用，代码：

` requestRuntimePermission(new String[]{Manifest.permission.ACCESS_WIFI_STATE,Manifest.permission.ACCESS_FINE_LOCATION}, new PermissionListener() { @Override public void onGranted() { Toast.makeText(MainActivity.this,"所有权限都同意了",Toast.LENGTH_SHORT).show(); }

@Override
public void onDenied(List<String> deniedPermission) {
    for(String persmission:deniedPermission){
        Toast.makeText(MainActivity.this,"被拒绝的权限："+persmission,Toast.LENGTH_SHORT).show();
    }

}

}); `

android自带定位和google play service定位：

自带定位：

获取系统的定位功能

` private void getLocation() { try { locationManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE); //获取所有可用的位置提供器 List providers = locationManager.getProviders(true); if (providers.contains(LocationManager.GPS_PROVIDER)) { //如果是GPS locationProvider = LocationManager.GPS_PROVIDER; } else if (providers.contains(LocationManager.NETWORK_PROVIDER)) { //如果是Network locationProvider = LocationManager.NETWORK_PROVIDER; } else {

        ToastUtils.showToast("没有可用的位置提供器");
        return;
    }

    Location mLocation = locationManager.getLastKnownLocation(locationProvider);

    if (null != mLocation) {
        getGeocoder(mLocation);
    }
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, myLocationListener);
} catch (SecurityException e) {
    e.printStackTrace();
}

} `

这里需要位置提供器才能获取到定位，通过监听方法可以不断的请求定位：

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 10, myLocationListener);

这样就可以用系统的定位功能了，由于在室内GPS比较难定位，下面使用google play services里面的定位功能

google play service定位：

1. 在build.gradle里面添加google play service依赖 compile 'com.google.android.gms:play-services-location:9.0.2'

2. 在AndroidManifest.xml添加 <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />

   和需要的权限等

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

3. 在MainActivity实现接口ConnectionCallbacks, OnConnectionFailedListener，并有回调方法 ` @Override public void onConnected(@Nullable Bundle bundle) { displayLocation(); }

   @Override public void onConnectionSuspended(int i) { mGoogleApiClient.connect(); }

   @Override public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { ToastUtils.showToast(connectionResult.getErrorMessage()); } `

4. 在 onResume()写上checkPlayServices() @Override public void onResume() { super.onResume(); checkPlayServices(); }

5. call mGoogleApiClient.connect()在onStart()方法 @Override public void onStart() { super.onStart(); if (mGoogleApiClient != null) { mGoogleApiClient.connect(); } }

6. 当google api connected成功了，displayLocation()方法在onConnected()之后会获取当前的位置信息 ` private boolean checkPlayServices() { int resultCode = GooglePlayServicesUtil .isGooglePlayServicesAvailable(this); if (resultCode != ConnectionResult.SUCCESS) { if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) { GooglePlayServicesUtil.getErrorDialog(resultCode, this, PLAY_SERVICES_RESOLUTION_REQUEST).show(); } else { Toast.makeText(this, "This device is not supported GooglePlayServices.", Toast.LENGTH_LONG) .show(); } return false; } return true; } private void displayLocation() {

   try {
       mLastLocation = LocationServices.FusedLocationApi
               .getLastLocation(mGoogleApiClient);
   
       if (mLastLocation != null) {
   
           getGeocoder(mLastLocation);
       }
   } catch (SecurityException e) {
       e.printStackTrace();
   }
   

   } `

7. 拿到当前的经纬度之后，去call google的api获取相对应的地理位置，api： http://maps.google.cn/maps/api/geocode/json

8. 更多详情请看demo