安卓高版本 安卓Q 读写文件出错解决及实例

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