Java Android的读取\u外部\u存储权限
我正在尝试访问用户设备上的媒体文件(音乐)以播放它们;一个简单的“hello world”-音乐播放器应用程序 我遵循了一些教程,它们基本上给出了相同的代码。但这是行不通的;它不断地崩溃,告诉我:Java Android的读取\u外部\u存储权限,java,android,audio-player,android-external-storage,android-music-player,Java,Android,Audio Player,Android External Storage,Android Music Player,我正在尝试访问用户设备上的媒体文件(音乐)以播放它们;一个简单的“hello world”-音乐播放器应用程序 我遵循了一些教程,它们基本上给出了相同的代码。但这是行不通的;它不断地崩溃,告诉我: error..... Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/au
error.....
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=27696, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
....
现在,这是我的清单文件:
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="slimsimapps.troff" >
<uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
我试过:
09-08 06:59:36.619 2009-2009/slimsimapps.troff D/AndroidRuntime﹕ Shutting down VM
--------- beginning of crash
09-08 06:59:36.619 2009-2009/slimsimapps.troff E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: slimsimapps.troff, PID: 2009
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.view.View$DeclaredOnClickListener.onClick(View.java:4452)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2009, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.os.Parcel.readException(Parcel.java:1599)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
at android.content.ContentResolver.query(ContentResolver.java:491)
at android.content.ContentResolver.query(ContentResolver.java:434)
at slimsimapps.troff.MainActivity.initialize(MainActivity.java:106)
at slimsimapps.troff.MainActivity.InitializeExternal(MainActivity.java:80)
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
--------- beginning of system
要将其放置在清单文件中的不同位置,请执行以下操作:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE”/>
要在javamethod中将Granturip放在uri和Curstro之间,请执行以下操作:
grantUriPermission(null, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
要使用此选项,它不会崩溃,但光标将变为null:
uri = MediaStore.Audio.Media.getContentUri("EXTERNAL_CONTENT_URI”);
要使用内部内容uri,这项工作正常,但它只提供“操作系统声音”,如快门声音、电池电量不足声音、按钮点击等:
uri = MediaStore.Audio.Media.INTERNAL_CONTENT_URI;
请帮助,这应该不是一个困难的问题,我知道,但我觉得这样一个初学者
我已阅读并尝试(或认为它们不适用于我的问题):
09-08 06:59:36.619 2009-2009/slimsimapps.troff D/AndroidRuntime﹕ Shutting down VM
--------- beginning of crash
09-08 06:59:36.619 2009-2009/slimsimapps.troff E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: slimsimapps.troff, PID: 2009
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.view.View$DeclaredOnClickListener.onClick(View.java:4452)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2009, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.os.Parcel.readException(Parcel.java:1599)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
at android.content.ContentResolver.query(ContentResolver.java:491)
at android.content.ContentResolver.query(ContentResolver.java:434)
at slimsimapps.troff.MainActivity.initialize(MainActivity.java:106)
at slimsimapps.troff.MainActivity.InitializeExternal(MainActivity.java:80)
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
--------- beginning of system
尝试更改行contentResolver.query
//change it to the columns you need
String[] columns = new String[]{MediaStore.Audio.AudioColumns.DATA};
Cursor cursor = contentResolver.query(uri, columns, null, null, null);
公共静态最终字符串媒体内容控件
由于媒体消费的隐私,不供第三方应用程序使用
请先尝试删除
,然后重试?请检查以下代码,使用这些代码可以从SD卡中查找所有音乐文件:
public class MainActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_animations);
getAllSongsFromSDCARD();
}
public void getAllSongsFromSDCARD() {
String[] STAR = { "*" };
Cursor cursor;
Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
cursor = managedQuery(allsongsuri, STAR, selection, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
do {
String song_name = cursor
.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
int song_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media._ID));
String fullpath = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DATA));
String album_name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM));
int album_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
String artist_name = cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST));
int artist_id = cursor.getInt(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID));
System.out.println("sonng name"+fullpath);
} while (cursor.moveToNext());
}
cursor.close();
}
}
}
我还在AndroidManifest.xml文件中添加了以下行,如下所示:
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
您有两种解决问题的方法。快速的方法是将targetApi降低到22(build.gradle文件)。 第二种是使用新的精彩的请求许可模式:
if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (shouldShowRequestPermissionRationale(
Manifest.permission.READ_EXTERNAL_STORAGE)) {
// Explain to the user why we need to read the contacts
}
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);
// MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
// app-defined int constant that should be quite unique
return;
}
在这里发现的狙击手:
解决方案2:如果不起作用,请尝试以下方法:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSION);
return;
}
然后在回调中
@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_PERMISSION) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted.
} else {
// User refused to grant permission.
}
}
}
这是来自评论。谢谢你的问题解决了吗?你的目标SDK是什么?尝试添加
android;maxSDKVersion=“21”
到
您必须在运行时请求权限:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
&& ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSION);
dialog.dismiss();
return;
}
在下面的回调中,您可以毫无问题地访问存储
@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_PERMISSION) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted.
} else {
// User refused to grant permission.
}
}
}
步骤1:添加对android manifest.xml的权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
步骤3:重写onRequestPermissionsResult方法以获取回调
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_READ_MEDIA:
if ((grantResults.length > 0) && (grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
readDataExternal();
}
break;
default:
break;
}
}
注意:readDataExternal()是从外部存储器获取数据的方法
谢谢。我也有类似的错误日志,下面是我所做的-
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},1);
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission granted and now can proceed
mymethod(); //a sample method called
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
}
return;
}
// add other cases for more permissions
}
}
除了所有答案之外,还应将官方文件发送至。 还可以指定要应用于此注释的minsdk
@TargetApi(_apiLevel_)
我用它来接受这个请求,即使我的minsdk是18岁。它所做的是,该方法仅在设备目标为“\u apilevel\u”和更高级别时运行。
以下是我的方法:
@TargetApi(23)
void solicitarPermisos(){
if (ContextCompat.checkSelfPermission(this,permiso)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (shouldShowRequestPermissionRationale(
Manifest.permission.READ_EXTERNAL_STORAGE)) {
// Explain to the user why we need to read the contacts
}
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
1);
// MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
// app-defined int constant that should be quite unique
return;
}
}
2021年,我面临着这个问题 所以我将使用 清单文件我在应用程序中添加了一个标记:
<application
android:requestLegayExternalStorage="true"
/>
奇怪的是,当您没有在清单中给出这一行时,会显示错误。您是否正在尝试读取一些受其他应用程序保护的文件?您尝试在哪个api级别上执行此操作?是否尝试清理项目@sunilsunny我不想读取受保护的som文件,反正我也不知道,只是一个简单的媒体播放器。是的,我尝试过清理它,我尝试过重新启动计算机,我尝试过生成一个签名的APK,并将其发布到google Play,作为测试人员访问它,但没有运气……@SharpEdge;我的AVD是标准的Nexus5,api 23。我的模块gradle有:compileSdkVersion 23 buildToolsVersion“23.0.0”minSdkVersion 14 targetSdkVersion 23所以我会说23。谢谢,我以前也尝试过类似的东西,但我尝试过你的代码,它在“cursor=managedQuery(allsongsuri,STAR,selection,null,null);”上崩溃,错误与以前相同。顺便说一句managedQuery已被弃用,但如果我将其更改为“contentResolver.query”,它仍然会崩溃,因为它具有相同的输入参数…嗨,我可以使用上述代码获取所有sdcadr歌曲。使用Android 4.2.2版设备,也可以使用5.0.2版。你正在尝试的。你有什么错误,请描述与Android版本我已经更新了堆栈跟踪问题,希望有帮助。安卓版是什么意思?(我使用的是apk 23)好的,让我给出完整的源代码,然后再检查一遍。如果你想自己测试,请在这里下载zip:当你运行它时,按左边的初始化按钮,生成crach。谢谢,我尝试了你的建议,但它在同一地点崩溃了。。。我正在使用Mac电脑,这可能是个问题吗?更新后,尝试删除
,然后重试?它可能会产生奇怪的行为,因为你的应用程序请求的权限不被允许谢谢,我试图删除该权限,但它在同一地点崩溃,并出现相同的错误…是的,当然!谷歌在最新的安卓系统中引入了新的权限模型!谢谢你,我会尽快测试它,如果它能工作,我会将它标记为正确的!(我开始认为这被忘记了!)请求的权限应该是读取外部存储。就像在。交换!=PackageManager.READ_外部_存储用于!=PackageManager.PERMISSION_GRANTED@Renascienza是的,你是对的。有人以错误的方式编辑了此答案。我的权限、请求、读取、外部存储是什么?使用Cordova为我工作,只将AndroidManifest.xml中的max SDK版本设置为22(而不是23)。我认为您将所需权限放错了:是读取、外部存储。我使用了它,它工作得很好。它在所有android设备上都能工作吗?
@TargetApi(_apiLevel_)
@TargetApi(23)
void solicitarPermisos(){
if (ContextCompat.checkSelfPermission(this,permiso)
!= PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (shouldShowRequestPermissionRationale(
Manifest.permission.READ_EXTERNAL_STORAGE)) {
// Explain to the user why we need to read the contacts
}
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
1);
// MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
// app-defined int constant that should be quite unique
return;
}
}
<application
android:requestLegayExternalStorage="true"
/>