解决Android Q 文件读写问题

Android Q 默认开启沙箱模式 导致出现文件读写失败

需要在使用动态权限申请的情况下在AndroidManifest.xml中加入

 android:requestLegacyExternalStorage="true"

AndroidManifest.xml文件内容

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.sdcard">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:requestLegacyExternalStorage="true"
        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>

动态权限申请

public Boolean checkPermission() {
    boolean isGranted = true;
    if (android.os.Build.VERSION.SDK_INT >= 23) {
        if (this.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            //如果没有写sd卡权限
            isGranted = false;
        }
        if (this.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            isGranted = false;
        }
        Log.i("cbs","isGranted == "+isGranted);
        if (!isGranted) {
            this.requestPermissions(
                    new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission
                            .ACCESS_FINE_LOCATION,
                            Manifest.permission.READ_EXTERNAL_STORAGE,
                            Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    102);
        }
    }
    return isGranted;
}

实例代码链接

https://github.com/skkily/AndroidQ_SDcardWriter