我希望有一个像文件浏览器一样工作的AlertDailog。我显示文件/目录列表，当用户点击一个文件夹时，我想在同一个AlertDialog中显示其内容。我想刷新AlertDialog而不是解雇并创建一个新的。
我已经尝试了几项检查其他问题，但我仍然无法做到。
这是我的DialogFragment
public class FileExplorer extends DialogFragment implements AdapterView.OnItemClickListener{
private View view;
private static final String TAG = "FileExplorer";
private static String extensionFilter;
private static File path;
private Item[] fileList;
AlertDialog.Builder builder;
ListFileAdapter myAdapter;
/**
* Empty constructor required for DialogFragment
*/
public FileExplorer (){
}
public static FileExplorer newInstance(String filePath, String fileFilter ) {
//stores in path the directory (if input). If not, it is the root directory
if (filePath!=null && !filePath.equals("")) {
path = new File(filePath);
if (path.isFile()){
path = path.getParentFile();
}
} else {
path = new File(Environment.getExternalStorageDirectory() + "");
}
if (fileFilter==null){
extensionFilter = "";
}
else {
extensionFilter = fileFilter;
}
//Bundle args = new Bundle();
//args.putSerializable("path", path);
//args.putSerializable("filter", extensionFilter);
FileExplorer fragment = new FileExplorer();
//fragment.setArguments(args);
return fragment;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState){
view = getActivity().getLayoutInflater().inflate(R.layout.activity_file_explorer, null);
//fill the fileList with all the files and folders in the directory
loadFileList();
myAdapter = new ListFileAdapter(getActivity(), fileList);
ListView fileListView = (ListView)view.findViewById(R.id.list);
fileListView.setAdapter(myAdapter);
fileListView.setOnItemClickListener(this);
builder = new AlertDialog.Builder(getActivity());
builder.setView(view);
return builder.create();
}
@Override
/**
*
* adapterView: is the list view that was clicked
* view: the row that was clicked
* position: position of the row
* id: id of the textview assigned by the system
*
*/
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id){
Toast.makeText(adapterView.getContext(), adapterView.getItemAtPosition(position).toString(), Toast.LENGTH_SHORT).show();
if (adapterView.getItemAtPosition(position).toString().equals("..")){
path = path.getParentFile();
} else {
path = new File(path.getPath() + "/" + adapterView.getItemAtPosition(position).toString());
}
loadFileList();
myAdapter.notifyDataSetChanged();
}
}
这是我的ListFileAdapter：
package com.cropwatuco.adapters;
import com.cropwatuco.general.FileExplorer.Item;
import com.cropwatuco.R;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ListFileAdapter extends BaseAdapter {
private Item[] list;
private Context context;
private static LayoutInflater inflater = null;
public ListFileAdapter(Context context, Item[] list) {
super();
this.list = list;
this.context = context;
// Layout inflator to call external xml layout ()
inflater = (LayoutInflater) this.context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
/**
* Abstract method from BaseAdapter
* Returns the total number of rows the list will have
*/
public int getCount() {
return list.length;
}
@Override
/**
* Abstract method from BaseAdapter
* Returns the data model for a given position, passed in as the typical int index
*/
public Object getItem(int position) {
return list[position];
}
@Override
/**
* Abstract method from BaseAdapter
* Returns a unique long value for a given position. As I dont have any, I return the position
*/
public long getItemId(int position) {
return position;
}
@Override
/**
* Abstract method from BaseAdapter
* Returns the View to use for a given row
*
* position: position in the list
* convertView: view that is reused (in case it is not null)
* parent: parent view
*
* return: the convertView modified or a new view
*/
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
// check if the row to recycle is not null
// if it is, a new one has to be created
// if not, it has to be recycled
if (row == null) {
row = inflater.inflate(R.layout.row_list, parent, false);
}
// get the access to the view elements of a row
// if it is a new row, it has to be created
// if not, the reference to the views are already created
ViewHolder holder = (ViewHolder) row.getTag();
if (holder == null) {
holder = new ViewHolder(row);
row.setTag(holder);
}
String filename = ((Item) getItem(position)).getString();
holder.label.setText(filename);
if (((Item) getItem(position)).getIsDirectory()) {
holder.icon.setImageResource(R.drawable.ic_folder);
} else {
holder.icon.setImageResource(R.drawable.ic_file);
}
return row;
}
class ViewHolder {
ImageView icon = null;
TextView label = null;
ViewHolder(View row) {
this.icon = (ImageView) row.findViewById(R.id.icon);
this.label = (TextView) row.findViewById(R.id.label);
}
}
}
最后，我的activity_file_explorer.xml
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#EEEEEE" />
这不会使用新内容更新列表视图。
如果我在myAdapter.notifyDataSetChanged（）之后添加builder.show（）;程序崩溃了这个堆栈：
11-15 20:58:15.170: E/InputEventReceiver(780): Exception dispatching input event.
11-15 20:58:15.170: E/MessageQueue-JNI(780): Exception in MessageQueue callback: handleReceiveCallback
11-15 20:58:15.287: E/MessageQueue-JNI(780): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.addViewInner(ViewGroup.java:3339)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.addView(ViewGroup.java:3210)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.addView(ViewGroup.java:3186)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.android.internal.app.AlertController.setupView(AlertController.java:413)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.android.internal.app.AlertController.installContent(AlertController.java:241)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.app.AlertDialog.onCreate(AlertDialog.java:337)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.app.Dialog.dispatchOnCreate(Dialog.java:355)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.app.Dialog.show(Dialog.java:260)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.app.AlertDialog$Builder.show(AlertDialog.java:951)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.cropwatuco.general.FileExplorer.onItemClick(FileExplorer.java:109)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.widget.AbsListView.onTouchEvent(AbsListView.java:3435)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.View.dispatchTouchEvent(View.java:7246)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2168)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1903)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1953)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1405)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.app.Dialog.dispatchTouchEvent(Dialog.java:740)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1901)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.View.dispatchPointerEvent(View.java:7426)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3220)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3165)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4292)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4271)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4363)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:179)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.os.MessageQueue.nativePollOnce(Native Method)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.os.MessageQueue.next(MessageQueue.java:125)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.os.Looper.loop(Looper.java:124)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at android.app.ActivityThread.main(ActivityThread.java:5041)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at java.lang.reflect.Method.invokeNative(Native Method)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at java.lang.reflect.Method.invoke(Method.java:511)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
11-15 20:58:15.287: E/MessageQueue-JNI(780): at dalvik.system.NativeStart.main(Native Method)
但我不知道要删除的内容和位置。
我会感激任何帮助，因为我已经坚持了一个多星期:(
答案 0 :(得分：0)
您似乎在本地加载新文件列表，而您的适配器包含旧项目。
快速解决方案是将适配器内的项目公开，以便您可以操作它们：
public class ListFileAdapter extends BaseAdapter {
public Item[] list;
...
}
然后更新监听器内的项目：
public void onItemClick(AdapterView<?> adapterV, View v, int pos, long id) {
...
loadFileList();
myAdapter.list = fileList;
myAdapter.notifyDataSetChanged();
}
您当然不必在点击监听器中调用builder.show，因为单击某个项目时已显示该对话框。