我如何返回一个Runnable在这种方法吗？ [英] How do I Return a Runnable in this Method?

问题描述

我不知道如何使一个Runnable方法的返回（或W /这个特殊的方法）。也许是我的想法错了（？）。任何帮助吗？日Thnx！

*这是继续执行/从<一个相关href=\"http://stackoverflow.com/questions/5889385/how-to-reuse-getexternalstoragestate/5889516#5889516\">this帖子。但认为它可能是对自己的问答。

在活动的onCreate：

 的Runnable doIfMounted = orderASC_Label（）;
    StorageStateChecker.performExternalStorageOperation（doIfMounted）;
 

可运行的：

  / **
 *  - 默认列表顺序（升序）
 * ================================================= ====================
 * @返回
 ** /
公众可运行orderASC_Label（）{
    光标databaseCursor = db.rawQuery（
            SELECT * FROM AC_list ORDER BY`label` ASC，NULL）;    Adapter_AC databaseListAdapter =新Adapter_AC（这一点，
            R.layout.list_item，databaseCursor，新的String [] {标签
                    标题，说明，gotoURL}，新的INT [] {
                    R.id.label，R.id.listTitle，R.id.caption，R.id.dummy}）;    databaseListAdapter.notifyDataSetChanged（）;
    this.setListAdapter（databaseListAdapter）;
    返回/ *空; ＆LT;  - 我该怎么做这里，使这个可运行* /
}
 

该StorageStateChecker类：​​

 公共类StorageStateChecker {公共静态布尔performExternalStorageOperation（Runnable接口doIfMounted）{
    如果（android.os.Environment.getExternalStorageState（）。等于（
            android.os.Environment.MEDIA_MOUNTED））{        如果（doIfMounted！= NULL）{
            doIfMounted.run（）;
        }
        返回true;    }否则如果（android.os.Environment.getExternalStorageState（）。等于（
            android.os.Environment.MEDIA_UNMOUNTED））{
         //Alerts.sdCardMissing(this）;
    }
    返回false;
}
}
 

解决方案

有没有理由使用方法返回一个Runnable。简单地声明一个成员（或静态最终）Runnable接口。所有code，它执行的推移在的run（）方法。

 私有静态最后的Runnable ORDER_ASC =新的Runnable（）{
    公共无效的run（）{
        光标databaseCursor = db.rawQuery（
            SELECT * FROM AC_list ORDER BY`label` ASC，NULL）;        Adapter_AC databaseListAdapter =新Adapter_AC（这一点，
            R.layout.list_item，databaseCursor，新的String [] {标签
                    标题，说明，gotoURL}，新的INT [] {
                    R.id.label，R.id.listTitle，R.id.caption，R.id.dummy}）;        databaseListAdapter.notifyDataSetChanged（）;
        this.setListAdapter（databaseListAdapter）;
    }
};
 

I don't know how to make a Return on a Runnable Method (or w/this particular method). I may have the idea wrong to(?). Any help? thnx!

*This is continued/related from this post. But thought it could be a Q on its own.

In the Activities onCreate:

Runnable doIfMounted = orderASC_Label();
    StorageStateChecker.performExternalStorageOperation(doIfMounted );

The Runnable:

/**
 * -- Default List Order (Ascending)
 * =====================================================================
 * @return 
 **/
public Runnable orderASC_Label() {
    Cursor databaseCursor = db.rawQuery(
            "SELECT * FROM AC_list ORDER BY `label` ASC", null);

    Adapter_AC databaseListAdapter = new Adapter_AC(this,
            R.layout.list_item, databaseCursor, new String[] { "label",
                    "title", "description", "gotoURL" }, new int[] {
                    R.id.label, R.id.listTitle, R.id.caption, R.id.dummy });

    databaseListAdapter.notifyDataSetChanged();
    this.setListAdapter(databaseListAdapter);
    return /*null; <-- What do I do here to make this runnable */
}

The StorageStateChecker class:

public class StorageStateChecker {

public static boolean performExternalStorageOperation(Runnable doIfMounted) {
    if (android.os.Environment.getExternalStorageState().equals(
            android.os.Environment.MEDIA_MOUNTED)) {

        if (doIfMounted != null) {
            doIfMounted.run();
        }
        return true;

    } else if (android.os.Environment.getExternalStorageState().equals(
            android.os.Environment.MEDIA_UNMOUNTED)) {
         //Alerts.sdCardMissing(this);
    }
    return false;
}
}

解决方案

There's no reason to use a method to return a Runnable. Simply declare a member (or static final) Runnable. All the code that executes goes in the run() method.

private static final Runnable ORDER_ASC = new Runnable() {
    public void run() {
        Cursor databaseCursor = db.rawQuery(
            "SELECT * FROM AC_list ORDER BY `label` ASC", null);

        Adapter_AC databaseListAdapter = new Adapter_AC(this,
            R.layout.list_item, databaseCursor, new String[] { "label",
                    "title", "description", "gotoURL" }, new int[] {
                    R.id.label, R.id.listTitle, R.id.caption, R.id.dummy });

        databaseListAdapter.notifyDataSetChanged();
        this.setListAdapter(databaseListAdapter);
    }
};

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