Android开发笔记之:ListView刷新顺序的问题详解

public class ListOrderActivity extends Activity {
    private ListView mTaskList;
    private EditText mAddTaskEditor;
    private LayoutInflater mFactory;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list_activity);

        mFactory = LayoutInflater.from(getApplication());
        mTaskList = (ListView) findViewById(R.id.task_list);
        final View headerView = mFactory.inflate(R.layout.header_view, null);
        mTaskList.addHeaderView(headerView);
        mAddTaskEditor = (EditText) headerView.findViewById(R.id.task_editor);
        mAddTaskEditor.setOnKeyListener(new OnKeyListener() {
            @Override
            public boolean onKey(View view, int keycode, KeyEvent event) {
         if (keycode == KeyEvent.KEYCODE_DPAD_CENTER || keycode == KeyEvent.KEYCODE_ENTER) {
             // finish editing
             final InputMethodManager inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
             inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
             final String text = mAddTaskEditor.getText().toString();
             if (!TextUtils.isEmpty(text)) {
          final ContentValues values = new ContentValues(1);
          values.put(TaskColumns.TASK, text);
          values.put(TaskColumns.TYPE, Task.TYPE_TODAY);
          getContentResolver().insert(Task.CONTENT_URI, values);
             }
             mAddTaskEditor.setText("");
         }
         return false;
            }
        });
        final Cursor cursor = getContentResolver().query(Task.CONTENT_URI, Task.PROJECTION, TaskColumns.TYPE + " = " + Task.TYPE_TODAY, null, null);
        final TaskAdapter adapter = new TaskAdapter(getApplication(), cursor);
        mTaskList.setAdapter(adapter);
    }

    private class TaskAdapter extends CursorAdapter {
        private Cursor mCursor;

        public TaskAdapter(Context context, Cursor c) {
            super(context, c);
            mCursor = c;
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            if (view  == null) {
                view = mFactory.inflate(R.layout.today_task_item, null);
            }
            final ViewSwitcher switcher = (ViewSwitcher) view.findViewById(R.id.action_switcher);
//            if (switcher.getDisplayedChild() == 1) {
//         switcher.clearAnimation();
//         switcher.showPrevious();
//         switcher.clearAnimation();
//            }
            final CheckBox toggle = (CheckBox) view.findViewById(R.id.action_toggle_done);
            final short done = cursor.getShort(ProjectionIndex.DONE);
            final int id = cursor.getInt(ProjectionIndex.ID);
            toggle.setOnCheckedChangeListener(null);
            toggle.setChecked(done != 0);
            toggle.setOnCheckedChangeListener(new OnCheckedChangeListener() {
         @Override
         public void onCheckedChanged(CompoundButton view, boolean checked) {
             final Uri uri = ContentUris.withAppendedId(Task.CONTENT_URI, id);
             final ContentValues values = new ContentValues(1);
             values.put(TaskColumns.DONE, checked ? 1 : 0);
             getContentResolver().update(uri, values, null, null);
         }
            });
            view.setOnClickListener(new OnClickListener() {
         @Override
         public void onClick(View v) {
             switcher.showNext();
             if (switcher.getDisplayedChild() == 0) {
          switcher.getInAnimation().setAnimationListener(null);
          return;
             }
             final ImageView delete = (ImageView) v.findViewById(R.id.action_delete_task);
             delete.setOnClickListener(new OnClickListener() {
          @Override
          public void onClick(View v) {
              switcher.getInAnimation().setAnimationListener(new AnimationListener() {
           @Override
           public void onAnimationEnd(Animation animation) {
               switcher.getInAnimation().setAnimationListener(null);
               final Uri uri = ContentUris.withAppendedId(Task.CONTENT_URI, id);
               getContentResolver().delete(uri, null, null);
           }

           @Override
           public void onAnimationRepeat(Animation animation) {
           }

           @Override
           public void onAnimationStart(Animation animation) {
           }
              });
              switcher.showPrevious();
          }
      });
         }
     });
            TextView task = (TextView) view.findViewById(R.id.task);
            final String taskContent = cursor.getString(ProjectionIndex.TASK);
            if (done != 0) {
         final Spannable style = new SpannableString(taskContent);
         style.setSpan(new StrikethroughSpan(), 0, taskContent.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
         style.setSpan(new StyleSpan(Typeface.ITALIC) , 0, taskContent.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
         task.setText(style);
         task.setTextAppearance(getApplication(), R.style.done_task_item_text);
            } else {
         task.setText(taskContent);
         task.setTextAppearance(getApplication(), R.style.task_item_text);
            }
        }
        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            View view = mFactory.inflate(R.layout.today_task_item, null);
            return view;
        }

        @Override
        public void onContentChanged() {
            mCursor.requery();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#f0f0f0"
    android:paddingBottom="5dip"
    android:paddingLeft="12dip"
    android:paddingRight="12dip"
    android:paddingTop="5dip" >
    <ListView
        android:id="@+id/task_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:divider="@color/divider"
        android:dividerHeight="0.6dip" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="horizontal"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:gravity="center">
    <ViewSwitcher android:id="@+id/action_switcher"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:gravity="center"
        android:inAnimation="@anim/action_switcher_in"
        android:outAnimation="@anim/action_switcher_out">
     <CheckBox android:id="@+id/action_toggle_done"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:gravity="center"
         android:layout_gravity="center" />
     <ImageView android:id="@+id/action_delete_task"
         android:src="@drawable/ic_delete"
         android:layout_width="48dip"
         android:layout_height="48dip"
         android:contentDescription="@string/delete_description"
         android:gravity="center"
         android:layout_gravity="center"
         android:scaleType="center" />
    </ViewSwitcher>
 <TextView android:id="@+id/task"
           style="@style/task_item_text" />
</LinearLayout>