摘要：
申请权限对于安卓开发很重要，从Android6.0开始，Android系统提供动态申请权限的机制,APP在使用危险权限时，需要用户的授权才可进一步操作。
申请权限对于安卓开发很重要，从Android6.0开始，Android系统提供动态申请权限的机制, APP在使用危险权限时，需要用户的授权才可进一步操作。所以这一篇文章介绍如何动态申请权限。非常简单。
一、在AndroidManifest.xml配置所需要的权限，代码如下
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.camera">
<!--需要配置的权限-->
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<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>二、新建一个项目，在MainActivity.java中加入动态申请权限的代码，代码如下
1 packagecom.example.camera; 2 3 importandroidx.appcompat.app.AppCompatActivity; 4 importandroidx.core.app.ActivityCompat; 5 importandroidx.core.content.ContextCompat; 6 7 importandroid.Manifest; 8 importandroid.content.pm.PackageManager; 9 importandroid.os.Bundle; 10 importandroid.view.Window; 11 importandroid.view.WindowManager; 12 13 public class MainActivity extendsAppCompatActivity { 14 private static final String TAG = "MainActivity"; 15 16 @Override 17 protected voidonCreate(Bundle savedInstanceState) { 18 super.onCreate(savedInstanceState); 19 20 //去除顶部状态栏 21 requestWindowFeature(Window.FEATURE_NO_TITLE); 22 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); 23 setContentView(R.layout.activity_main); 24 //Android 6.0相机动态权限检查 25 if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)==PackageManager.PERMISSION_GRANTED){ 26 }else{ 27 ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA,Manifest.permission.WRITE_EXTERNAL_STORAGE},1); 28 } 29 30 } 31 }
其中requestPermissions的requestcode为1，作为后面的判断用。
第二种方法，新建一个权限的数组，代码如下：
1 public class MainActivity extendsAppCompatActivity { 2 private static final String TAG = "MainActivity"; 3 4 private static final String[] permission = newString[] { 5 Manifest.permission.CAMERA, 6 Manifest.permission.WRITE_EXTERNAL_STORAGE 7 }; 8 9 @Override 10 protected voidonCreate(Bundle savedInstanceState) { 11 super.onCreate(savedInstanceState); 12 13 //去除顶部状态栏 14 requestWindowFeature(Window.FEATURE_NO_TITLE); 15 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); 16 setContentView(R.layout.activity_main); 17 //Android 6.0相机动态权限检查 18 if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)==PackageManager.PERMISSION_GRANTED){ 19 }else{ 20 ActivityCompat.requestPermissions(this,permission,1); 21 } 22 23 } 24 }