MediaRecorder.setOutputFile java.io.FileNotFoundException:：打开失败: android模拟器中android 9上的EACCES (权限拒绝)

Question

Android模拟器

Android Studio 4.2.1

Android:9.0

在AndroidManifest.xml中，

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.androidhello">

    <application
        android:requestLegacyExternalStorage="true"
        ...
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
</manifest>

我的自定义服务类ScreenRecordService：

...
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
Date curDate = new Date(System.currentTimeMillis());
String curTime = formatter.format(curDate).replace(" ", "");
String videoQuality = "HD";
if(isVideoSd) videoQuality = "SD";
MediaRecorder mediaRecorder = new MediaRecorder();
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setOutputFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES) + "/" + videoQuality + curTime + ".mp4");
...

应用程序运行失败，出现以下错误：

/storage/emulated/0/Movies/SD2021-06-01-08-26-55.mp4: W/System.err: java.io.FileNotFoundException: java.io.FileNotFoundException打开失败: EACCES (权限拒绝)

Answer 1

在mediaRecorder.setOutputFile之前，询问运行时权限。

String[] permissions = { Manifest.permission.RECORD_AUDIO,Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE };
ActivityCompat.requestPermissions(this, permissions, 123);