Android CursorAdapter在第一次加载时没有刷新

Question

编辑我没有添加我的XML

我正在编写一个用于标记选择的对话框。第一个视图是在数据库中应用标记。下一个屏幕是一个用于向其数据库添加新标记的对话框。我正在为他们的标签提供建议。我想在他们开始输入标签时过滤列表。我为每个屏幕使用两个自定义CursorAdapter，但它们共享相同的ListView。我还使用CursorLoader在后台运行我的查询，这些查询都从支持库扩展。

当我第一次打开新标签屏幕时，在对话框出现后，列表不会使用Android 4.0.3中的过滤光标刷新，快速滚动也不起作用。如果我切换到标签视图然后回到新标签对话框，它会过滤和滚动它应该..我的查询工作，代码每次都在Android 2.3.3中工作。我无法弄清楚为什么这不起作用。这是我的CursorLoader和Suggestion适配器的代码。

package org.lds.ldssa;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.SimpleCursorAdapter;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.*;
import org.lds.ldssa.service.MLDatabase;
import org.lds.ldssa.service.aws.Annotation;

 public class TagDialog extends AlertDialog implements LoaderManager.LoaderCallbacks<Cursor> {

private static final String TAG = "ldssa.tagdialog";
public static final int TAGLOADERID = 0;

// View Items
private EditText mEditText;
private ListView mListView;
private TextView mEmptyView;
private ProgressBar mProgressBar;
private ImageButton mNewTagButton;
private ImageButton mSortTagButton;
private TextView mTitle;
private Button mOkButton;
private Button mCancelButton;
private String mTagTitle;
private String mNewTagTitle;

private Annotation mAnnotation;
private ContentFragment mContentFragment;

private boolean isNewTagView;
private static final String KEY_NEWTAGVIEW = "new_tag_view";
private SimpleCursorAdapter mSuggestionAdapter;
private TagListAdapter mTagAdapter;

private MLDatabase mlDatabase;

protected TagDialog(Context context) {
    super(context);
}

public void onCreate(Bundle savedInstanceState){
    Context context = getContext();
    Resources r = context.getResources();

    final LayoutInflater inflater = LayoutInflater.from(context);
    View view = inflater.inflate(R.layout.dialog_tag, null);

    // Main parts of the view        
    mEditText = (EditText) view.findViewById(R.id.tag_new_tag);
    mListView = (ListView) view.findViewById(android.R.id.list);
    mProgressBar = (ProgressBar) view.findViewById(R.id.tag_spin_progress_bar);
    mEmptyView = (TextView) view.findViewById(android.R.id.empty);
    mEmptyView.setVisibility(View.INVISIBLE);

    // Titlebar
    View titleBar = inflater.inflate(R.layout.dialog_tag_title, null);
    mNewTagButton = (ImageButton) titleBar.findViewById(R.id.tag_new_icon);
    mSortTagButton = (ImageButton) titleBar.findViewById(R.id.tag_sort_icon);
    mTitle = (TextView) titleBar.findViewById(R.id.tag_title);
    mTagTitle = r.getString(R.string.tag_dialog_title);
    mNewTagTitle = r.getString(R.string.tag_new_dialog_title);
    this.setCustomTitle(titleBar);

    // Buttons
    final String OK = r.getString(R.string.ok);
    final String CANCEL = r.getString(R.string.cancel);
    this.setButton(BUTTON_POSITIVE, OK, new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) { /*Never Used*/}});
    this.setButton(BUTTON_NEGATIVE, CANCEL, new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) { /*Never Used*/}});

    // Setup Button Listeners
    setOnShowListener(new OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {
            Button ok = getButton(BUTTON_POSITIVE);
            ok.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(isNewTagView){
                        hideIMM();
                        setupTagDialog();
                        mEditText.setText("");
                    } else {
                        dismiss();
                    }
                }
            });

            Button cancel = getButton(BUTTON_NEGATIVE);
            cancel.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(isNewTagView){
                        hideIMM();
                        setupTagDialog();
                        mEditText.setText("");
                    } else {
                        dismiss();
                    }
                }
            });
        }
    });

    mNewTagButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            setupNewTagDialog();
        }
    });
    mSortTagButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });

    mEditText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {}

        @Override
        public void afterTextChanged(Editable s) {
           LoaderManager lm = getLoaderManager();
            if(lm != null){
                Loader l = lm.getLoader(TAGLOADERID);
                if(l != null){
                    l.forceLoad();
                } else {
                    restartLoader();
                }
            } else {
                restartLoader();
            }
        }
    });
    String[] UIBindFrom = {MLDatabase.CL_ID};
    int[] UIBindTo = {android.R.id.text1};
    mTagAdapter = new TagListAdapter(context, null);
    mSuggestionAdapter = new SimpleCursorAdapter(context, android.R.layout.simple_list_item_1, null,
            UIBindFrom, UIBindTo, 0);

    //Handle Rotations
    if(savedInstanceState == null){
        //New
        setupTagDialog();
    } else {
        //rotated
        isNewTagView = savedInstanceState.getBoolean(KEY_NEWTAGVIEW, false);
        if(isNewTagView){
            restoreTagState(savedInstanceState);
        } else {
            restoreNewTagState(savedInstanceState);
        }
    }

    LoaderManager lm = getLoaderManager();
    if(lm != null){
        lm.initLoader(TAGLOADERID, null, this);
    }

    this.setView(view);
    super.onCreate(savedInstanceState);
}

public void onStart(){
    restartLoader();
}

@Override
public Bundle onSaveInstanceState(){
    Bundle bundle = super.onSaveInstanceState();

    bundle.putBoolean(KEY_NEWTAGVIEW, isNewTagView);

    return bundle;
}

@Override
public void onBackPressed(){
    if(isNewTagView){
        hideIMM();
        setupTagDialog();
    } else {
        this.dismiss();
    }
}

private void setupTagDialog() {
    isNewTagView = false;
    mTitle.setText(mTagTitle);
    mNewTagButton.setVisibility(View.VISIBLE);
    mSortTagButton.setVisibility(View.VISIBLE);
    mEditText.setVisibility(View.GONE);
    mListView.setVisibility(View.GONE);
    mProgressBar.setVisibility(View.VISIBLE);
    mListView.setAdapter(mTagAdapter);
    restartLoader();
}

private void setupNewTagDialog() {
    isNewTagView = true;
    mTitle.setText(mNewTagTitle);
    mNewTagButton.setVisibility(View.INVISIBLE);
    mSortTagButton.setVisibility(View.INVISIBLE);
    mEditText.setVisibility(View.VISIBLE);
    mListView.setVisibility(View.GONE);
    mProgressBar.setVisibility(View.VISIBLE);
    mListView.setAdapter(mSuggestionAdapter);
    restartLoader();
}

private void restoreTagState(Bundle bundle) {
    setupTagDialog();
}

private void restoreNewTagState(Bundle bundle) {
    setupNewTagDialog();
}

public void setAnnotation(Annotation a) {
    mAnnotation = a;
}

public void setContentViewInterface(ContentFragment contentFragment) {
    mContentFragment = contentFragment;
}

private MLDatabase getDatabase() {
    if(mlDatabase == null){
        GospelLibraryApplication app = (GospelLibraryApplication) getContext().getApplicationContext();
        mlDatabase = app.getMlDatabase();
    }
    return mlDatabase;
}

public String getFilter() {
    return mEditText.getText().toString().trim();
}

public Integer getAnnotationID(){
    if(mAnnotation != null){
        return mAnnotation.getDbKey();
    }
    return -1;
}

private LoaderManager getLoaderManager(){
    if(mContentFragment == null){
        Log.d(TAG, "ContentFragment is NULL!");
        return null;
    }
    return mContentFragment.getContentActivity().getSupportLoaderManager();
}

private void restartLoader(){
    LoaderManager lm = getLoaderManager();
    if(lm != null){
        lm.restartLoader(TAGLOADERID, null, this);
    }
}

private void hideIMM(){
    InputMethodManager imm = (InputMethodManager)getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
    imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0);
}

@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    TagCursorLoader loader = new TagCursorLoader(getContext(), this);
    return loader;
}

@Override
public void onLoadFinished(Loader<Cursor> cursorLoader, Cursor data) {
    if(isNewTagView) {
        mSuggestionAdapter.changeCursor(data);
    } else {
        mTagAdapter.changeCursor(data);
    }
    mListView.invalidateViews();
    mProgressBar.setVisibility(View.GONE);
    mListView.setVisibility(View.VISIBLE);
}

@Override
public void onLoaderReset(Loader<Cursor> cursorLoader) {
    if(mSuggestionAdapter != null) {
        mSuggestionAdapter.changeCursor(null);
    }
}

public static class TagCursorLoader extends CursorLoader {
    private final ForceLoadContentObserver mObserver = new ForceLoadContentObserver();

    private TagDialog dialog;
    private MLDatabase mlDatabase;
    private Cursor mCursor;
    private String mFilter;
    private Integer mAnnotationID;

    // Runs on worker thread
    @Override
    public Cursor loadInBackground(){
        Cursor cursor = null;
        if(dialog.isNewTagView){
            mFilter = dialog.getFilter();
            cursor = mlDatabase.getTagSuggestions(mFilter);
        } else {
            mAnnotationID = dialog.getAnnotationID();
        }

        if(cursor != null){
            cursor.registerContentObserver(mObserver);
        }

        return cursor;

    }

    //Runs on UI thread
    @Override
    public void deliverResult(Cursor cursor){
        //Handle if canceled in the middle.
        if(isReset()){
            if(cursor != null){
                cursor.close();
            }
            return;
        }

        Cursor oldCursor = mCursor;
        mCursor = cursor;
        if(isStarted()) {
            super.deliverResult(cursor);
        }

        if(oldCursor != null && !oldCursor.equals(cursor) && !oldCursor.isClosed()) {
            oldCursor.close();
        }
    }

    public TagCursorLoader(Context context, TagDialog dialog) {
        super(context);
        this.dialog = dialog;
        mlDatabase = dialog.getDatabase();
    }

    @Override
    public void onStartLoading(){
        if(mCursor == null) {
            forceLoad();
        } else {
            if(dialog.isNewTagView && mFilter.equals(dialog.getFilter())) {
                deliverResult(mCursor);
            } else {
                forceLoad();
            }
        }
    }

    @Override
    protected void onStopLoading() {
        // Attempt to cancel the current load task if possible.
        cancelLoad();
    }

    @Override
    public void onCanceled(Cursor cursor) {
        if (cursor != null && !cursor.isClosed()) {
            cursor.close();
        }
    }

    @Override
    protected void onReset() {
        super.onReset();

        // Ensure the loader is stopped
        onStopLoading();

        if (mCursor != null && !mCursor.isClosed()) {
            mCursor.close();
        }
        mCursor = null;
    }
  }
}

package org.lds.ldssa;

import android.R;
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.widget.CursorAdapter;
import android.widget.TextView;
import org.lds.ldssa.service.MLDatabase;


public class TagSuggestionAdapter extends CursorAdapter {

    public TagSuggestionAdapter(Context context, Cursor cursor, int flags){
        super(context, cursor, flags);
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(context);
        View v = inflater.inflate(R.layout.simple_list_item_1, parent, false);
        bindView(v, context, cursor);
        return v;
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        TextView tv = (TextView) view.findViewById(R.id.text1);
        tv.setText(cursor.getString(cursor.getColumnIndex(MLDatabase.CL_ID)));
    }
}

在预先感谢您的帮助。

XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tag_layout"
    android:orientation="vertical"
    android:layout_height="wrap_content"
    android:layout_width="@dimen/min_dialog_width"
    android:padding="5dp"
    android:animateLayoutChanges="true"
    >

<!-- Here is the view to show if the list is emtpy -->
<TextView
        android:id="@android:id/empty"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="50dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_centerInParent="true"
        android:gravity="center"
        android:text="@string/no_items"
        android:visibility="invisible"
        />

<ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="invisible"
        />

<ProgressBar
        android:id="@+id/tag_spin_progress_bar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:indeterminate="true"
        />

</RelativeLayout>

Answer 1

不用

试试

    android:animateLayoutChanges="true"

...在您的XML布局中。