不使用 ContentProvider 时使用 CursorLoader

Android SDK 文档说startManagingCursor()方法已弃用：

此方法已被弃用。使用新的 CursorLoader 类和 LoaderManager 代替；这也可以通过 Android 兼容包在旧平台上使用。此方法允许活动根据活动的生命周期为您管理给定 Cursor 的生命周期。也就是说，当 Activity 停止时，它将自动对给定的 Cursor 调用 deactivate() ，并且当稍后重新启动时，它将为您调用 requery() 。当 Activity 被销毁时，所有托管 Cursors 将自动关闭。如果您的目标是 HONEYCOMB 或更高版本，请考虑使用 LoaderManager，可通过 getLoaderManager() 获得

所以我想用CursorLoader。但我如何将它与自定义一起使用CursorAdapter并且没有ContentProvider，当我在构造函数中需要 URI 时CursorLoader?

我写了一个简单的CursorLoader https://gist.github.com/1217628不需要内容提供商：

import android.content.Context;
import android.database.Cursor;
import android.support.v4.content.AsyncTaskLoader;

/**
 * Used to write apps that run on platforms prior to Android 3.0. When running
 * on Android 3.0 or above, this implementation is still used; it does not try
 * to switch to the framework's implementation. See the framework SDK
 * documentation for a class overview.
 *
 * This was based on the CursorLoader class
 */
public abstract class SimpleCursorLoader extends AsyncTaskLoader<Cursor> {
    private Cursor mCursor;

    public SimpleCursorLoader(Context context) {
        super(context);
    }

    /* Runs on a worker thread */
    @Override
    public abstract Cursor loadInBackground();

    /* Runs on the UI thread */
    @Override
    public void deliverResult(Cursor cursor) {
        if (isReset()) {
            // An async query came in while the loader is stopped
            if (cursor != null) {
                cursor.close();
            }
            return;
        }
        Cursor oldCursor = mCursor;
        mCursor = cursor;

        if (isStarted()) {
            super.deliverResult(cursor);
        }

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

    /**
     * Starts an asynchronous load of the contacts list data. When the result is ready the callbacks
     * will be called on the UI thread. If a previous load has been completed and is still valid
     * the result may be passed to the callbacks immediately.
     * <p/>
     * Must be called from the UI thread
     */
    @Override
    protected void onStartLoading() {
        if (mCursor != null) {
            deliverResult(mCursor);
        }
        if (takeContentChanged() || mCursor == null) {
            forceLoad();
        }
    }

    /**
     * Must be called from the UI thread
     */
    @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;
    }
}

它只需要AsyncTaskLoader班级。要么是Android 3.0以上版本，要么是兼容包自带的。

I also wrote a ListLoader https://github.com/casidiablo/groundy/blob/d60a51760582b8a03ea9a06ea7ca938d3785ea15/library/src/main/java/com/telly/groundy/loader/ListLoader.java这是兼容的LoadManager并用于检索通用的java.util.List收藏。