2020年6月11日星期四

android6,0申请权限

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

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

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。

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);

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

    @Overridepublic 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();   }  } }}

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
<?

继续努力！~


发帖者 时间：

没有评论:

发表评论

订阅： 博文评论 (Atom)