目前我正在尝试检索图库中图像的位置并将其转换为文件，以便我可以将其上传到互联网。但我收到了这个错误。当我打开图库并选择图像时，错误发生了。我对Android没有那么精通，仍然认为自己是初学者。所以如果你决定投票我的问题，请告诉我为什么我可以学习的原因。谢谢。
Logcat： -
05-07 08:11:45.052 8697-8697/com.example.megasap.jobforhire_android E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.megasap.jobforhire_android, PID: 8697
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://com.android.providers.media.documents/document/image:34 flg=0x1 }} to activity {com.example.megasap.jobforhire_android/com.example.megasap.jobforhire_android.ProfileEditActivity}: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.database.CursorWindow.nativeGetString(Native Method)
at android.database.CursorWindow.getString(CursorWindow.java:438)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
at android.database.CursorWrapper.getString(CursorWrapper.java:137)
at com.example.megasap.jobforhire_android.ProfileEditActivity.getRealPathFromURI(ProfileEditActivity.java:233)
at com.example.megasap.jobforhire_android.ProfileEditActivity.onActivityResult(ProfileEditActivity.java:191)
at android.app.Activity.dispatchActivityResult(Activity.java:6428)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
我用来检索图像的代码如下： -
private String getRealPathFromURI(Uri contentURI) {
String result;
Cursor cursor = getContentResolver().query(contentURI, null, null, null, null);
if (cursor == null) { // Source is Dropbox or other similar local file path
result = contentURI.getPath();
} else {
cursor.moveToFirst();
int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
result = cursor.getString(idx); // getting error here ; it returns -1
cursor.close();
}
return result;
}
答案 0 :(得分：1)
您必须使用查询添加列名MediaStore.Images.Media.DATA。
更新getRealPathFromURI()，如下所示：
private String getRealPathFromURI(Uri contentURI) {
String result;
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(contentURI, filePathColumn, null, null, null);
if (cursor == null) { // Source is Dropbox or other similar local file path
result = contentURI.getPath();
} else {
cursor.moveToFirst();
int idx = cursor.getColumnIndex(filePathColumn[0]);
result = cursor.getString(idx);
cursor.close();
}
return result;
}
使用onActivityResult()方法：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
try {
// When an Image is picked
if (requestCode == YOUR_REQUEST_CODE && resultCode == RESULT_OK
&& null != data) {
// Get the Image from data
Uri selectedImage = data.getData();
// Get real path
String imageRealPath = getRealPathFromURI(selectedImage);
// Do something
}
} catch (Exception e) {
Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG)
.show();
}
}
确保您已添加权限：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
这是一个很好的tutorial。希望这会有所帮助〜
答案 1 :(得分：1)
您不应该尝试获取文件路径并从该URI构造文件对象以上载文件。你不需要这一切。直接使用uri打开输入流。
你现在有的地方
curl -L -s 'https://registry.hub.docker.com/v2/repositories/library/centos/tags?page_size=1024'|jq '."results"[]["name"]'
将其替换为
FileInputStream fis = new FileInputStream(path);
答案 2 :(得分：1)
此功能支持19以下的API，包括19：
public String getRealPathFromURI(Uri uri) {
Cursor cursor = this.getContentResolver().query(uri, null, null, null, null);
String result;
// for API 19 and above
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
cursor.moveToFirst();
String image_id = cursor.getString(0);
image_id = image_id.substring(image_id.lastIndexOf(":") + 1);
cursor.close();
cursor = this.getContentResolver().query(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, MediaStore.Images.Media._ID + " = ? ", new String[]{image_id}, null);
}
cursor.moveToFirst();
result = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
cursor.close();
return result;
}