android6,0申请权限

android6.0开启权限遇到的一些坑

一个小白，记录学习遇到的一些坑

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最近在做android方面的实验，做到用LocationManager进行定位，发现单独在AndroidManifest.xml文件中

声明开启权限，不能够真正的开启想要的权限，说是安全问题，其实在日常中我们都很清楚的一个权限开启方式。

遇到问题，第一个想到的就是上网搜索，但是能解决问题的答案少的可怜，所以就记录下来，防止下次在遇到，不知所措。

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废话不多说，其实很简单。在你报错的地方加上一个判断语句，判断当前的sdk版本是否大于23，大于就申请开启权限；否则直接跳过去执行你的代码

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this,new String[]{
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.ACCESS_COARSE_LOCATION
        },2);
        return;
    }
}

下面是我要执行的代码，这段代码就是要申请开启权限的核心

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0,
        locationListener);

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原函数是

public static void requestPermissions(final @NonNull Activity activity,
        final @NonNull String[] permissions, final @IntRange(from = 0) int requestCode) {

参数：

1. activity: 顾名思义，就是要申请权限的那个activity。

2. permissions： 要申请的权限名称，比如我申请的有

     Manifest.permission.ACCESS_FINE_LOCATION,卫星定位要用到
    Manifest.permission.ACCESS_COARSE_LOCATION.基站定位要用到
   

3. requestCode： 随便填个数，目前我了解这个参数在重写onRequestPermissionsResult这个方法用的到，重写这个方法可以了解到权限有没有开启成功。

   可以通过重写该函数去显示权限开启成功还是失败

   @Override
   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                          int[] grantResults) {
       if (requestCode == 2) {
           for (int i = 0; i < permissions.length; i++) {
               if (grantResults[i] == PERMISSION_GRANTED) {
                   Toast.makeText(this, "" + "权限" + permissions[i] + "申请成功", Toast.LENGTH_SHORT).show();
               } else {
                   Toast.makeText(this, "" + "权限" + permissions[i] + "申请失败", Toast.LENGTH_SHORT).show();
               }
           }
       }
   }
   

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下面我贴出我本次做的一个实验

• 布局文件

• java代码

package com.example.locationmanage;

import android.Manifest;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Build;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import java.text.SimpleDateFormat;
import java.util.Date;

import static android.content.pm.PackageManager.PERMISSION_GRANTED;

public class MainActivity extends AppCompatActivity {
    TextView info;
    TextView location;
    LocationManager locationManager;
    LocationListener locationListener;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        info = findViewById(R.id.t1);
        location = findViewById(R.id.t2);
        //locationManger初始化
        locationListener_init();
        locationManager_init();
    }


    void locationManager_init() {
        locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
        locationListener_init();


        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    Activity#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for Activity#requestPermissions for more details.
                ActivityCompat.requestPermissions(this,new String[]{
                        Manifest.permission.ACCESS_FINE_LOCATION,
                        Manifest.permission.ACCESS_COARSE_LOCATION
                },2);
                return;
            }
        }
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0,
                locationListener);

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                           int[] grantResults) {
        if (requestCode == 2) {
            for (int i = 0; i < permissions.length; i++) {
                if (grantResults[i] == PERMISSION_GRANTED) {
                    Toast.makeText(this, "" + "权限" + permissions[i] + "申请成功", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "" + "权限" + permissions[i] + "申请失败", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }


    void locationListener_init() {
        locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                SimpleDateFormat dateFormat = (SimpleDateFormat)
                        SimpleDateFormat.getTimeInstance(2);
                String str = dateFormat.format(new Date(location.getTime()));
                info.setText("时间：" + str + "\n");
                info.append("经度：" + location.getLongitude() + "\n");
                info.append("纬度：" + location.getLatitude() + "\n");
                info.append("海拔：" + location.getAltitude() + "\n");
            }

            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {
                if (status == LocationProvider.AVAILABLE)
                    info.setText("当前的gps可见的\n");
                else if (status == LocationProvider.OUT_OF_SERVICE)
                    info.setText("当前的gps服务区外\n");
                else if (status == LocationProvider.TEMPORARILY_UNAVAILABLE)
                    info.setText("当前的gps被暂停\n");
            }

            @Override
            public void onProviderEnabled(String provider) {
                info.setText("当前的gps被启动\n");
            }

            //被警用时触发
            @Override
            public void onProviderDisabled(String provider) {
                info.setText("当前的gps被禁用\n");
            }
        };

    }
}

• 应用清单文件AndroidManifest

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继续努力！~