android------关于API 23的权限问题

谁借莪１个温暖的怀抱￠ 2022-07-29 11:50 163阅读 0赞

在代码：

locationManager.requestLocationUpdates(provider, 60000, 50, getListener());

中报以下的错误：

Call requires permission which may be rejected by user: code should explicitly check to see if permission is available (with \`checkPermission\`) or explicitly handle a potential \`SecurityException\`

在AndroidManifest.xml中加入了以下的权限还是有错：

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

百度了下，大意是：

调用需要的权限可能被用户拒绝:代码应该显式地检查权限是否可用(用checkPermission)或显式地处理一个潜在的“SecurityException”

这是在使用 Android marshmallow（API 23）时出现的

参考以下代码解决：

public class MainActivity extends AppCompatActivity {
    
        /* GPS Constant Permission */
        private static final int MY_PERMISSION_ACCESS_COARSE_LOCATION = 11;
        private static final int MY_PERMISSION_ACCESS_FINE_LOCATION = 12;
    
        /* Position */
        private static final int MINIMUM_TIME = 10000;  // 10s
        private static final int MINIMUM_DISTANCE = 50; // 50m
    
        /* GPS */
        private String mProviderName;
        private LocationManager mLocationManager;
        private LocationListener mLocationListener;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            ...
    
            mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    
            // Get the best provider between gps, network and passive
            Criteria criteria = new Criteria();
            mProviderName = mLocationManager.getBestProvider(criteria, true);
    
            // API 23: we have to check if ACCESS_FINE_LOCATION and/or ACCESS_COARSE_LOCATION permission are granted
            if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED
                    || ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
    
                // No one provider activated: prompt GPS
                if (mProviderName == null || mProviderName.equals("")) {
                    startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
                }
    
                // At least one provider activated. Get the coordinates
                switch (mProviderName) {
                    case "passive":
                        mLocationManager.requestLocationUpdates(mProviderName, MINIMUM_TIME, MINIMUM_DISTANCE, this);
                        Location location = mLocationManager.getLastKnownLocation(mProviderName);
                        break;
    
                    case "network":
                        break;
    
                    case "gps":
                        break;
    
                }
    
            // One or both permissions are denied.
            } else {
    
                // The ACCESS_COARSE_LOCATION is denied, then I request it and manage the result in
                // onRequestPermissionsResult() using the constant MY_PERMISSION_ACCESS_FINE_LOCATION
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {
                    ActivityCompat.requestPermissions(this,
                            new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                            MY_PERMISSION_ACCESS_COARSE_LOCATION);
                }
                // The ACCESS_FINE_LOCATION is denied, then I request it and manage the result in
                // onRequestPermissionsResult() using the constant MY_PERMISSION_ACCESS_FINE_LOCATION
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {
                    ActivityCompat.requestPermissions(this,
                            new String[] { Manifest.permission.ACCESS_FINE_LOCATION },
                            MY_PERMISSION_ACCESS_FINE_LOCATION);
                }
    
            }
        }
    
        @Override
        public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
            switch (requestCode) {
                case MY_PERMISSION_ACCESS_COARSE_LOCATION: {
                    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                        // permission was granted
                    } else {
                        // permission denied
                    }
                    break;
    
                case MY_PERMISSION_ACCESS_FINE_LOCATION: {
                    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                        // permission was granted
                    } else {
                        // permission denied
                    }
                    break;
                }
    
            }
        }
    }