如何解决如何写入android的内部存储
我正在使用 qtcreator 并通过我的具有 WRITE_EXTERNAL_STORAGE 权限的 IDE 创建了一个 AndroidManifest.xml 但我无法将任何文件写入我的手机存储( /storage/self/primary 或 /storage /emulated/0/ ) (错误:文件未打开)
类似于 Telegram 应用程序的电报文件夹
更新
<?xml version="1.0"?>
<manifest package="org.qtproject.example" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="-- %%INSERT_VERSION_NAME%% --" android:versionCode="-- %%INSERT_VERSION_CODE%% --" android:installLocation="auto">
<uses-sdk android:minSdkVersion="16" android:targetSdkVersion="29"/>
<!-- The following comment will be replaced upon deployment with default permissions based on the dependencies of the application.
Remove the comment if you do not require these default permissions. -->
<!-- %%INSERT_PERMISSIONS -->
<!-- The following comment will be replaced upon deployment with default features based on the dependencies of the application.
Remove the comment if you do not require these default features. -->
<!-- %%INSERT_FEATURES -->
<supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
<application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="-- %%INSERT_APP_NAME%% --">
<activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density" android:name="org.qtproject.qt5.android.bindings.QtActivity" android:label="-- %%INSERT_APP_NAME%% --" android:screenorientation="landscape" android:launchMode="singletop">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<!-- Application arguments -->
<!-- Meta-data android:name="android.app.arguments" android:value="arg1 arg2 arg3"/ -->
<!-- Application arguments -->
<Meta-data android:name="android.app.lib_name" android:value="-- %%INSERT_APP_LIB_NAME%% --"/>
<Meta-data android:name="android.app.qt_sources_resource_id" android:resource="@array/qt_sources"/>
<Meta-data android:name="android.app.repository" android:value="default"/>
<Meta-data android:name="android.app.qt_libs_resource_id" android:resource="@array/qt_libs"/>
<Meta-data android:name="android.app.bundled_libs_resource_id" android:resource="@array/bundled_libs"/>
<!-- Deploy Qt libs as part of package -->
<Meta-data android:name="android.app.bundle_local_qt_libs" android:value="-- %%BUNDLE_LOCAL_QT_LIBS%% --"/>
<Meta-data android:name="android.app.bundled_in_lib_resource_id" android:resource="@array/bundled_in_lib"/>
<Meta-data android:name="android.app.bundled_in_assets_resource_id" android:resource="@array/bundled_in_assets"/>
<!-- Run with local libs -->
<Meta-data android:name="android.app.use_local_qt_libs" android:value="-- %%USE_LOCAL_QT_LIBS%% --"/>
<Meta-data android:name="android.app.libs_prefix" android:value="/data/local/tmp/qt/"/>
<Meta-data android:name="android.app.load_local_libs" android:value="-- %%INSERT_LOCAL_LIBS%% --"/>
<Meta-data android:name="android.app.load_local_jars" android:value="-- %%INSERT_LOCAL_JARS%% --"/>
<Meta-data android:name="android.app.static_init_classes" android:value="-- %%INSERT_INIT_CLASSES%% --"/>
<!-- Used to specify custom system library path to run with local system libs -->
<!-- <Meta-data android:name="android.app.system_libs_prefix" android:value="/system/lib/"/> -->
<!-- Messages maps -->
<Meta-data android:value="@string/ministro_not_found_msg" android:name="android.app.ministro_not_found_msg"/>
<Meta-data android:value="@string/ministro_needed_msg" android:name="android.app.ministro_needed_msg"/>
<Meta-data android:value="@string/fatal_error_msg" android:name="android.app.fatal_error_msg"/>
<Meta-data android:value="@string/unsupported_android_version" android:name="android.app.unsupported_android_version"/>
<!-- Messages maps -->
<!-- Splash screen -->
<!-- Orientation-specific (portrait/landscape) data is checked first. If not available for current orientation,then android.app.splash_screen_drawable. For best results,use together with splash_screen_sticky and
use hideSplashScreen() with a fade-out animation from Qt Android Extras to hide the splash screen when you
are done populating your window with content. -->
<!-- Meta-data android:name="android.app.splash_screen_drawable_portrait" android:resource="@drawable/logo_portrait" / -->
<!-- Meta-data android:name="android.app.splash_screen_drawable_landscape" android:resource="@drawable/logo_landscape" / -->
<!-- Meta-data android:name="android.app.splash_screen_drawable" android:resource="@drawable/logo"/ -->
<!-- Meta-data android:name="android.app.splash_screen_sticky" android:value="true"/ -->
<!-- Splash screen -->
<!-- Background running -->
<!-- Warning: changing this value to true may cause unexpected crashes if the
application still try to draw after
"applicationStateChanged(Qt::ApplicationSuspended)"
signal is sent! -->
<Meta-data android:name="android.app.background_running" android:value="false"/>
<!-- Background running -->
<!-- auto screen scale factor -->
<Meta-data android:name="android.app.auto_screen_scale_factor" android:value="false"/>
<!-- auto screen scale factor -->
<!-- extract android style -->
<!-- available android:values :
* default - In most cases this will be the same as "full",but it can also be something else if needed,e.g.,for compatibility reasons
* full - useful QWidget & Quick Controls 1 apps
* minimal - useful for Quick Controls 2 apps,it is much faster than "full"
* none - useful for apps that don't use any of the above Qt modules
-->
<Meta-data android:name="android.app.extract_android_style" android:value="minimal"/>
<!-- extract android style -->
</activity>
<!-- For adding service(s) please check: https://wiki.qt.io/AndroidServices -->
</application>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
</manifest>
解决方法
正如@Ak23 指出的那样,由于您可能具有写入存储的功能,因此您很可能没有在运行时检查存储权限。以下是如何检查和授予权限的示例代码:
bool uploadToStorage()
{
auto result = QtAndroid::checkPermission(QString("android.permission.WRITE_EXTERNAL_STORAGE"));
if (result == QtAndroid::PermissionResult::Denied) {
QtAndroid::PermissionResultMap resultHash = QtAndroid::requestPermissionsSync(QStringList({"android.permission.WRITE_EXTERNAL_STORAGE"}));
if (resultHash["android.permission.WRITE_EXTERNAL_STORAGE"] == QtAndroid::PermissionResult::Denied)
return false;
else {
/* Here is Your method to upload to storage */
return true;
}
}
else {
/* Here is Your method to upload to storage */
return true;
}
}
如您所见 - 首先您使用 checkPermission()
检查是否授予权限,然后如果未授予您必须使用 requestPermissionsSync()
请求它- 如果您想授予写入存储的权限,它应该显示一个带有问题的弹出窗口。确认权限无误后,即可调用上传文件的函数。
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