基于Activity Result API的权限封装，权限申请原来如此简单

GitHub地址: https://github.com/kongpf8848/TKPermission

前言

什么是Activity Result API?

参考链接
Activity Result API 是 Google官方推荐的Activity、Fragment获取返回结果的方式，提供了用于注册结果、启动结果以及在系统分派结果后对其进行处理的组件。引入方式如下：

implementation 'androidx.activity:activity:1.2.0-alpha06'
implementation 'androidx.activity:activity-ktx:1.2.0-alpha06'
implementation 'androidx.fragment:fragment:1.3.0-alpha06'
implementation 'androidx.fragment:fragment-ktx:1.3.0-alpha06'

主要用到两个组件：
ActivityResultContract：契约，定义了输入数据的类型和输出数据的类型，定义了如何传递数据和如何处理返回的数据

public abstract class ActivityResultContract<I, O> {

 /** Create an intent that can be used for {@link Activity#startActivityForResult} */
    public abstract @NonNull Intent createIntent(@NonNull Context context,
            @SuppressLint("UnknownNullness") I input);

    /** Convert result obtained from {@link Activity#onActivityResult} to O */
    @SuppressLint("UnknownNullness")
    public abstract O parseResult(int resultCode, @Nullable Intent intent);
    ......
 
}

谷歌定义了一系列常用的ActivityResultContract协议

StartActivityForResult，用于启动新的页面并获取返回结果
RequestPermission，用于申请单个权限并获取返回结果
RequestMultiplePermissions，用于申请多个权限并获取返回结果
GetContent()，用于选择内容并获取返回结果
PickContact，用于选择联系人并获取返回结果
TakePicture，用于拍照并获取返回结果
TakeVideo，用于拍摄视频并获取返回结果

ActivityResultLauncher：启动器，调用ActivityResultLauncher的launch方法来启动页面跳转，作用相当于原来的startActivity()

/**
 * A launcher for a previously-{@link ActivityResultCaller#registerForActivityResult prepared call}
 * to start the process of executing an {@link ActivityResultContract}.
 *
 * @param <I> type of the input required to launch
 */
public abstract class ActivityResultLauncher<I> {

    /**
     * Executes an {@link ActivityResultContract}.
     *
     * @param input the input required to execute an {@link ActivityResultContract}.
     */
    public void launch(@SuppressLint("UnknownNullness") I input) {
        launch(input, null);
    }

    /**
     * Executes an {@link ActivityResultContract}.
     *
     * @param input the input required to execute an {@link ActivityResultContract}.
     * @param options Additional options for how the Activity should be started.
     */
    public abstract void launch(@SuppressLint("UnknownNullness") I input,
            @Nullable ActivityOptionsCompat options);

    /**
     * Unregisters this launcher, releasing the underlying result callback, and any references
     * captured within it.
     *
     * You should call this if the registry may live longer than the callback registered for this
     * launcher.
     */
    @MainThread
    public abstract void unregister();

    /**
     * Get the {@link ActivityResultContract} that was used to create this launcher.
     *
     * @return the contract that was used to create this launcher
     */
    @NonNull
    public abstract ActivityResultContract<I, ?> getContract();
}

如我们现在需要申请位置权限，旧的权限申请方式如下:

 val PERMISSION_REQUEST_LOCATION = 0
  ActivityCompat.requestPermissions(
            this,
            arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
            PERMISSION_REQUEST_LOCATION
        )

然后在onRequestPermissionsResult处理申请结果：

 override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == PERMISSION_REQUEST_LOCATION) {
            if(grantResults.size == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            }
        }
    }

基于Activity Result API的申请方式如下：

   registerForActivityResult(RequestPermission()){
            /**
             * 此处处理申请结果
             */
            Toast.makeText(this@ForResultActivity, "result:${it}", Toast.LENGTH_SHORT).show()
        }.launch(Manifest.permission.ACCESS_FINE_LOCATION)

是不是一下子简洁了很多，有木有，哈哈

正文

TKPermission是基于AndroidX Activity Result API封装的权限类库，摆脱了旧的繁琐的权限申请方式，让权限申请变得无比简单轻松

功能特点

使用简单，调用方式友好，兼容Kotlin和Java，使用Kotlin语言调用更酸爽
基于Google最新的Activity Result API封装，代码量极少，极简主义
支持一次申请单个权限和多个权限，基本满足各类权限申请使用场景

使用

implementation 'com.github.kongpf8848:tkpermission:1.0.0'

Kotlin

一次申请单个权限

permission(Manifest.permission.CAMERA) {
    /**
     * 权限允许时回调
     */
   granted {
   }
   /**
    * 权限拒绝时回调
    */
   denied {
   }
}

一次申请多个权限

permissions(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO) {
     /**
      * 多个权限全部被允许时回调
      */
     allGranted {

     }
     /**
      * 被拒绝的权限列表
      */
     denied {

     }
}

Java

一次申请单个权限

PermissionUtils.INSTANCE.requestPermission(this, Manifest.permission.READ_PHONE_STATE, new PermissionListener() {
    /**
     * 权限允许时回调
     */
    @Override
    public void granted(String permission) {
    }
    /**
     * 权限拒绝时回调
     */
    @Override
    public void denied(String permission) {
    }
});

一次申请多个权限

PermissionUtils.INSTANCE.requestMultiplePermissions(this, Arrays.asList(Manifest.permission.READ_CONTACTS, Manifest.permission.READ_SMS), new MultiplePermissionsListener() {
    /**
     * 多个权限全部被允许时回调
     */
    @Override
    public void allGranted() {

    }
    /**
     * 被拒绝的权限列表
     */
    @Override
    public void denied(List<String> list) {

    }
});

希望TKPermission能帮助到有需要的同学们，愿大家工作顺利，天天开心!