微调ArrayAdapter与自定义布局崩溃 [英] Spinner ArrayAdapter crashing with custom layout

问题描述

我想用一个自定义的微调/ ArrayAdapter实验。以下是我的code：

I am trying to experiment with a custom Spinner / ArrayAdapter. Following is my code:

    myspinner=(Spinner)findViewById(R.id.myspinner);
    myadapter=new ArrayAdapter<String>(this,R.layout.mytextview,R.id.mytv,sample_data);
    myadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    myspinner.setOnItemSelectedListener(this);
    myspinner.setAdapter(myadapter);

下面是一个包含MYTV自定义布局mytextview：

Following is the custom layout mytextview that contains mytv:

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:id="@+id/mylayout" android:layout_width="match_parent" android:layout_height="wrap_content">
        <View android:layout_width="match_parent" android:layout_height="15dip" android:id="@+id/myview1" android:background="@color/bordertop"></View>
        <TextView android:layout_height="wrap_content" android:layout_width="wrap_content" android:textSize="30dip" android:id="@+id/mytv"></TextView>
        <View android:layout_width="match_parent" android:layout_height="15dip" android:id="@+id/myview2" android:background="@color/borderbottom"></View>
    </LinearLayout>

当我是preSS微调带来的弹出，Android的崩溃。该逻辑来工作完全正常，当我注释掉setDropDownViewResource方法。我还是不明白什么看法setDropDownViewResource实际上是设置。谁能告诉我怎么看起来像在默认情况下。而且，如果一个人想用自定义的布局覆盖吗？ - 不布局需要有一个特定的结构

When i'm press the spinner to bring the popup, Android crashes. The came logic works perfectly fine, when I comment out the setDropDownViewResource method. I still don't understand what view setDropDownViewResource actually sets. Can anyone show me how it looks like by default. And, if one wants to override it with a custom layout - does the layout need to have a specific structure?

推荐答案

下面是我通常用于纺纱：

here is what i have typically used for spinners:

Spinner distancespinner = (Spinner) findViewById(R.id.distance);
ArrayAdapter<CharSequence> distanceadapter = ArrayAdapter.createFromResource(
    this, R.array.distance, android.R.layout.simple_spinner_item);
distanceadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
distancespinner.setAdapter(distanceadapter);
distancespinner.setOnItemSelectedListener(new distanceSelector());

（显然替换任何你想要的距离）

(obviously replace distance with whatever you want)

<Spinner
    android:id="@+id/distance"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:prompt="@string/app_name"
    />

我，它看起来像你的问题是在这一行：

to me it looks like your problem is in this line :

myadapter=new ArrayAdapter<String>(this,R.layout.mytextview,R.id.mytv,sample_data);

但后来我不知道，你的 ArrayAdapter 基于而是因为我有和按的微调的android.R.layout.simple_spinner_item ID为参考标准微调外观布局，由平台定义，然后setDropDownViewResource（ INT）被调用来定义每个项目的外观小部件打开时（simple_spinner_dropdown_item是由平台定义的另一个标准布局）。

but then i dont know, your ArrayAdapter is based on instead of as i have and as per Spinner "the android.R.layout.simple_spinner_item ID references a layout for the standard spinner appearance, defined by the platform. Then setDropDownViewResource(int) is called to define the appearance for each item when the widget is opened (simple_spinner_dropdown_item is another standard layout defined by the platform)."

我觉得如果你想自定义您的微调， .setDropDownViewResource（）; 是在哪里做的。

i think if you want to customize your spinner, .setDropDownViewResource(); is where to do it.

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