我想在 Android 外部公共路徑 ( ) 中創建一個目錄"storage/emulated/0/MyImages"。該代碼在 Android 9 上運行。授予所有在外部存儲上寫入的運行時權限。試過這樣的代碼。File dir = new File(Environment.getExternalStorageDirectory() + File.separator + "MyImages");if (!dir.exists) { dir.mkdirs();}該dir變量具有路徑 - "/storage/emulated/0/MyImages"。dir.mkdirs()總是返回false。LogCat 有一個簡短的日志：W/System.err: java.io.IOException: No such file or directoryW/System.err: at java.io.UnixFileSystem.createFileExclusively0(Native Method)W/System.err: at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:281)W/System.err: at java.io.File.createNewFile(File.java:1008)
1 回答
嗶嗶one
TA貢獻1854條經驗 獲得超8個贊
首先，如果是，請檢查權限然后調用您的函數來調用 showPhoneStatePermission
在清單中添加權限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
private void showPhoneStatePermission() {
int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
showExplanation("Permission Needed", "Rationale", Manifest.permission.WRITE_EXTERNAL_STORAGE, REQUEST_PERMISSION_WRITE_EXTERNAL_STORAGE);
} else {
requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, REQUEST_PERMISSION_WRITE_EXTERNAL_STORAGE);
}
} else {
Toast.makeText(MainActivity.this, "Permission (already) Granted!", Toast.LENGTH_SHORT).show();
}
}
添加回答
舉報
0/150
提交
取消