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Android 权限申请的简单实现

Android 权限申请的简单实现

作者: 笔头还没烂 | 来源:发表于2023-03-01 11:20 被阅读0次
    1. 先注册。先在 module 下的 src/main/AndroidManifest.xml 注册要申请的权限。举个例子,比如我们要申请写入外部存储的权限 android.permission.WRITE_EXTERNAL_STORAGE,AndroidManifest.xml 权限注册的代码如下所示:
    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools">
    
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    
        <application
            android:allowBackup="true"
            android:dataExtractionRules="@xml/data_extraction_rules"
            android:fullBackupContent="@xml/backup_rules"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/Theme.MyApplication"
            tools:targetApi="31">
            <activity
                android:name=".MainActivity"
                android:exported="true">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
    
                <meta-data
                    android:name="android.app.lib_name"
                    android:value="" />
            </activity>
        </application>
    </manifest>
    
    1. 申请权限以及一些细节的处理(比如如果用户拒绝应用获取该权限、下次是否还需继续询问等,如果只需询问一次,则按以下代码处理即可)申请权限的代码如下所示:
    package com.example.myapplication;
    
    import androidx.annotation.NonNull;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.core.app.ActivityCompat;
    import androidx.core.content.ContextCompat;
    import androidx.core.content.PackageManagerCompat;
    
    import android.Manifest;
    import android.content.pm.PackageManager;
    import android.os.Bundle;
    import android.util.Log;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
    
        private static final int MY_PERMISSIONS_READ_SMS_REQ_CODE = 1;
        private static final String TAG = "Hello";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            requestPermission();
        }
    
        public void requestPermission() {
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_SMS) != PackageManager.PERMISSION_GRANTED) {
                //检查到未授权该权限信息
                //Should we show an explanation?
                if (ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.READ_SMS)) {
                    //上一次用户拒绝了开启此权限!
                    Log.e(TAG, "requestPermission: 上一次用户拒绝了开启此权限");
                    //权限申请完成,回调
                }else {
                    Log.e(TAG, "requestPermission: 开始申请权限");
                    ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.READ_SMS},MY_PERMISSIONS_READ_SMS_REQ_CODE);
                }
            }else {
                Log.e(TAG, "requestPermission: 用户已经同意过授权");
                //权限申请完成,回调
            }
        }
    
        @Override
        public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
            switch (requestCode) {
                case MY_PERMISSIONS_READ_SMS_REQ_CODE: {
                    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                        Toast.makeText(this,"申请成功",Toast.LENGTH_SHORT).show();
                    }else {
                        Toast.makeText(this,"申请失败",Toast.LENGTH_SHORT).show();
                    }
                    //权限申请完成,回调
                    return;
                }
            }
        }
    }
    

    以上,感谢阅读!

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