java– “必须调用setView” – 自定义类扩展按钮

概述所以我有一个12x9网格的“按钮”称为“瓷砖”.Tile.java扩展了小部件“Button”.我现在遇到了一个问题,我正试图让按钮显示一个回忆按下按钮ID的吐司.网格是动态添加的,我希望它保持这种状态.这是GameBoardActivity.java的代码：这使得“瓷砖”的12×9网格为每个网格添加了一个

所以我有一个12 x 9网格的“按钮”称为“瓷砖”.
Tile.java扩展了小部件“button”.

我现在遇到了一个问题,我正试图让按钮显示一个回忆按下按钮ID的吐司.

网格是动态添加的,我希望它保持这种状态.

这是GameBoardActivity.java的代码：

这使得“瓷砖”的12×9网格为每个网格添加了一个监听器.

    public voID grIDRowbuttons(int iterations){    final Tile[] gridspaces = new Tile[12];    linearLayout.LayoutParams buttonParams = new linearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 1.0f);    for (int i = 0; i < 12; i++) {        String IDString = String.valueOf(aToI[iterations]) + String.valueOf(i + 1);        final int ID = getResources().getIDentifIEr(IDString, "ID", getPackagename());        gridspaces[i] = new Tile(getApplicationContext());        gridspaces[i].setText("");        gridspaces[i].setHeight(40);        gridspaces[i].setWIDth(40);        gridspaces[i].setLayoutParams(buttonParams);        gridspaces[i].setID(ID);        OnClickListener showID = new OnClickListener(){            public voID onClick(VIEw vIEw){                                 TextVIEw text = (TextVIEw) findVIEwByID(R.ID.tileIDText);                String tileID = getApplicationContext().getResources().getResourceEntryname(ID);                text.setText(tileID);                Tile clickedTile = (Tile) findVIEwByID(ID);                clickedTile.tileClick(0, tileID);            }        };        gridspaces[i].setonClickListener(showID);    }    linearLayout buttonRow = new linearLayout(getApplicationContext());    buttonRow.setorIEntation(linearLayout.HORIZONTAL);    buttonRow.setLayoutParams(buttonParams);    linearLayout boardspace = (linearLayout) this.findVIEwByID(R.ID.boardLayout);    for (int i = 0; i < gridspaces.length; i++) {        buttonRow.addVIEw(gridspaces[i]);    }    boardspace.addVIEw(buttonRow);}

这是上面提到的tileClick方法：

    public voID tileClick(int action, String tileID) {    switch(action) {        case 1 :            //action 1        case 2 :            //action 2        default :            Context context = getContext();            Toast toast = new Toast(context);            Toast.makeText(context, tileID, Toast.LENGTH_SHORT);            toast.show();    }}

LogCat显示以下内容：

02-22 20:45:14.623: E/AndroIDRuntime(7868): FATAL EXCEPTION: main02-22 20:45:14.623: E/AndroIDRuntime(7868): java.lang.RuntimeException: setVIEw must have been called02-22 20:45:14.623: E/AndroIDRuntime(7868):     at androID.Widget.Toast.show(Toast.java:103)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at com.jneal.ecquire.Tile.tileClick(Tile.java:51)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at com.jneal.ecquire.GameBoardActivity.onClick(GameBoardActivity.java:55)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at androID.vIEw.VIEw.performClick(VIEw.java:3627)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at androID.vIEw.VIEw$PerformClick.run(VIEw.java:14329)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at androID.os.Handler.handleCallback(Handler.java:605)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at androID.os.Handler.dispatchMessage(Handler.java:92)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at androID.os.Looper.loop(Looper.java:137)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at androID.app.ActivityThread.main(ActivityThread.java:4511)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at java.lang.reflect.Method.invokeNative(Native Method)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at java.lang.reflect.Method.invoke(Method.java:511)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:976)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:743)02-22 20:45:14.623: E/AndroIDRuntime(7868):     at dalvik.system.NativeStart.main(Native Method)

这是怎么回事？我有几乎完全相同的代码,用于在我的MainActivity.java中显示toast并且执行没有问题.
是因为我扩展了button而且它不知道视图已经是什么？
另外,Eclipse不会因为某些原因让我添加setVIEw().我确定我在这里遇到了封装问题,但我对它们是什么感到困惑.
感谢您的帮助.
JRad

解决方法:

将下面的代码行更改为以下代码：

        Toast toast = new Toast(context);        Toast.makeText(context, tileID, Toast.LENGTH_SHORT);        toast.show();

改为：

    Toast toast = Toast.makeText(context, tileID, Toast.LENGTH_SHORT);    toast.show();       

从源代码中可以看出,只有当mNextVIEw为null时才会抛出该异常.
函数“makeText”假设设置它,但确实如此,但是您的原始代码不会捕获对它构建的Toast的引用.相反,您的原始代码会创建两个Toasts,并尝试“显示”尚未设置其视图的Toast.

public voID show() {    if (mNextVIEw == null) {        throw new RuntimeException("setVIEw must have been called");    }....public static Toast makeText(Context context, CharSequence text, int duration) {    Toast result = new Toast(context);    LayoutInflater inflate = (LayoutInflater)            context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    VIEw v = inflate.inflate(com.androID.internal.R.layout.transIEnt_notification, null);    TextVIEw tv = (TextVIEw)v.findVIEwByID(com.androID.internal.R.ID.message);    tv.setText(text);    result.mNextVIEw = v;    result.mDuration = duration;    return result;}

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