Permission ในระบบ android แบ่งได้เป็น 2 ชนิดคือ

• Normal Permission กรณีนี้ไม่จำเป็นต้องขอ Runtime Permission
• Dangerous Permission จำเป็นต้องขอ Runtime Permission

แต่อย่างไรก็ตาม ต้องขอ Permission ในไฟล์ AndroidManifest.xml ด้วย

build.gradle (Module: app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.0"
    defaultConfig {
        applicationId "com.phaisarn.myapplication"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.github.armcha:SimplePermissions:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:dist="http://schemas.android.com/apk/distribution"
    package="com.phaisarn.myapplication">

    <dist:module dist:instant="true" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

บรรทัดที่ 8-9 : ขอ Permission

MainActivity.java

package com.phaisarn.myapplication;

import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Toast;

import com.luseen.simplepermission.permissions.Permission;
import com.luseen.simplepermission.permissions.PermissionActivity;
import com.luseen.simplepermission.permissions.SinglePermissionCallback;

public class MainActivity extends PermissionActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (Build.VERSION.SDK_INT >= 23) {  // >= Build.VERSION_CODES.M
                    requestPermission(Permission.CAMERA, new SinglePermissionCallback() {
                        @Override
                        public void onPermissionResult(boolean permissionGranted, boolean isPermissionDeniedForever) {
                            if (permissionGranted) {
                                imageCapture();
                            } else {
                                Toast.makeText(getBaseContext(), "Please grant permissions", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
                } else {
                    imageCapture();
                }
            }
        });
    }

    private void imageCapture() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        //...
        startActivityForResult(intent, 999);
    }
}

บรรทัดที่ 14 : กำหนดให้สืบทอดจาก PermissionActivity (ปกติสืบทอดจาก AppCompatActivity)
ถ้าเป็น Fragment ให้สืบทอดจาก PermissionFragment (ปกติสืบทอดจาก Fragment)

บรรทัดที่ 25 : ขอ Permission เดียว ใช้ SinglePermissionCallback()

Link

• https://github.com/armcha/SimplePermissions