安卓高版本 安卓Q 读写文件出错解决及实例
2019-12-09 本文已影响0人
skkily
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
