最近公司的录屏项目需要的一个功能，有一个悬浮窗功能，点击悬浮窗按钮就能直接录屏，需求很简单，但是遇到一个很蛋疼的问题，就是请求android的录屏权限必须要是使用startActivityForResult,如果直接在桌面请求会有一个问题，那就是悬浮窗在桌面时，点击悬浮窗会后台唤起app，这就很不友好了，在网上查阅了各种资料也无果，最后终于想到了一个方法，自己新建一个申请权限的activity，并把它的主题设置为透明，然而还是不行，最后又一波百度谷歌，给activity加了一个单例的启动模式后终于成功，我主要贴出了PermissionActivity的代码，后面有github的完整代码。

Manifest清单文件

<activity android:name=".activity.PermissionActivity"
                  android:launchMode="singleInstance"
                  android:theme="@style/NoActivity">
        </activity>

PermissionActivity

class PermissionActivity : Activity() {


    private var projectionManager: MediaProjectionManager? = null
    /** 屏幕录制控制 */
    private var mRecordService: RecordService.RecordBinder? = null


    /** 服务绑定回调 */
    private var mServiceConnection: ServiceConnection = object : ServiceConnection {
        override fun onServiceDisconnected(name: ComponentName?) {
            mRecordService = null
            Log.d("record","服务解绑")

        }

        override fun onServiceConnected(name: ComponentName, service: IBinder) {
            mRecordService = service as RecordService.RecordBinder
            Log.d("record","服务绑定")
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        projectionManager = getSystemService(Context.MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
        val intent = Intent(this, RecordService::class.java)
        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
        bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE)

        val captureIntent = projectionManager?.createScreenCaptureIntent()
        startActivityForResult(captureIntent, RECORD_REQUEST_CODE)
    }

    override fun onDestroy() {
        super.onDestroy()
        unbindService(mServiceConnection)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        mRecordService?.onRequestResult(requestCode, resultCode, data)
        finish()
    }
}

透明主题

<style name="NoActivity" parent="android:Theme.Translucent.NoTitleBar.Fullscreen">
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:colorBackgroundCacheHint">@null</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowAnimationStyle">@android:style/Animation</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowContentOverlay">@null</item>
    </style>

https://github.com/song234876/ScreenDemo

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