相关疑难解决方法(0)

在Android 4.4(KitKat)中访问新图库之前,我使用此方法在SD卡上获得了真正的路径:

public String getPath(Uri uri) {
   String[] projection = { MediaStore.Images.Media.DATA };
   Cursor cursor = managedQuery(uri, projection, null, null, null);
   startManagingCursor(cursor);
   int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
   cursor.moveToFirst();
 return cursor.getString(column_index);
}

现在,Intent.ACTION_GET_CONTENT返回不同的数据:

之前:

content://media/external/images/media/62

现在:

content://com.android.providers.media.documents/document/image:62

我怎么能设法获得SD卡上的真实路径？

我正在尝试编写代码以从Android应用程序发送短信,但当我尝试发送短信时,它会将错误发送给我:

09-17 18:37:29.974  12847-12847/**.**.****E/AndroidRuntime? FATAL EXCEPTION: main
Process: **.**.****, PID: 12847
java.lang.SecurityException: Sending SMS message: uid 10092 does not have android.permission.SEND_SMS.
        at android.os.Parcel.readException(Parcel.java:1599)
        at android.os.Parcel.readException(Parcel.java:1552)
        at com.android.internal.telephony.ISms$Stub$Proxy.sendTextForSubscriber(ISms.java:768)
        at android.telephony.SmsManager.sendTextMessageInternal(SmsManager.java:310)
        at android.telephony.SmsManager.sendTextMessage(SmsManager.java:293)
        at **.**.****.MainActivity$3.onClick(MainActivity.java:70)
        at android.view.View.performClick(View.java:5198)
        at android.view.View$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)

我检查了但是我在清单中有权限,如下所示:

<?xml version="1.0" encoding="utf-8"?>

<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-feature android:name="android.hardware.telephony"
    android:required="true"/>

<application
    android:exported="true"
    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"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity> …

这是关于在请求权限时Android Marshmallow中引入的新运行时权限模型Manifest.permission.WRITE_EXTERNAL_STORAGE.

简而言之,我所遇到的是,如果我请求(和用户允许)Manifest.permission.WRITE_EXTERNAL_STORAGE权限,应用程序将无法从外部存储目录读取和写入,直到我销毁并重新启动应用程序.

这就是我正在做/经历的事情:

我的应用程序从以下状态开始:

ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED

这是,我没有权限访问外部存储.

然后,我就像Google解释的那样请求Manifest.permission.WRITE_EXTERNAL_STORAGE的许可

private void requestWriteExternalStoragePermission() {
    // Should we show an explanation?
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
        new AlertDialog.Builder(this)
                .setTitle("Inform and request")
                .setMessage("You need to enable permissions, bla bla bla")
                .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions(MendeleyActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, RC_PERMISSION_WRITE_EXTERNAL_STORAGE);
                    }
                })
                .show();
    } else {
        ActivityCompat.requestPermissions(MendeleyActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, RC_PERMISSION_WRITE_EXTERNAL_STORAGE);
    }
}

一旦用户允许该权限,onRequestPermissionsResult就会被调用.

@Override …