最近公司的錄屏項目需要的一個功能，有一個懸浮窗功能黎做，點(diǎn)擊懸浮窗按鈕就能直接錄屏叉跛，需求很簡單，但是遇到一個很蛋疼的問題蒸殿，就是請求android的錄屏權(quán)限必須要是使用startActivityForResult,如果直接在桌面請求會有一個問題筷厘，那就是懸浮窗在桌面時，點(diǎn)擊懸浮窗會后臺喚起app宏所，這就很不友好了酥艳，在網(wǎng)上查閱了各種資料也無果，最后終于想到了一個方法爬骤，自己新建一個申請權(quán)限的activity充石，并把它的主題設(shè)置為透明，然而還是不行霞玄，最后又一波百度谷歌骤铃，給activity加了一個單例的啟動模式后終于成功，我主要貼出了PermissionActivity的代碼坷剧，后面有g(shù)ithub的完整代碼惰爬。

Manifest清單文件

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

PermissionActivity

class PermissionActivity : Activity() {


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


    /** 服務(wù)綁定回調(diào) */
    private var mServiceConnection: ServiceConnection = object : ServiceConnection {
        override fun onServiceDisconnected(name: ComponentName?) {
            mRecordService = null
            Log.d("record","服務(wù)解綁")

        }

        override fun onServiceConnected(name: ComponentName, service: IBinder) {
            mRecordService = service as RecordService.RecordBinder
            Log.d("record","服務(wù)綁定")
        }
    }

    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()
    }
}

透明主題

<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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