java - 2.2 中与布局安排相关的 Android 微调器错误

Question

下面是我在使用我的 Android 应用程序时遇到的错误的链接。与其试图通过大量的文字来解释它，我认为一个简单的视频会更直接、更容易理解。

http://www.youtube.com/watch?v=9V3v854894g

我已经在这个问题上苦苦思索了一天半了。我最近才发现它可以通过更改 XML 布局来解决，这对我来说完全没有意义。我不知道如何正确修复它，也不知道如何解决这个问题，因为我需要在我的应用程序中使用嵌套布局。

谢谢大家的帮助!

代码如下:

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;

public class Builder extends Activity {
    private Spinner mCompSelect;
    private Spinner mNameSelect;
    private int[] mCompColorAsBuilt;
    private int mComponent;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.builder);

        mCompColorAsBuilt = new int[3];

        //Attach our objects
        mCompSelect = (Spinner) findViewById(R.id.component);
        mNameSelect = (Spinner) findViewById(R.id.component_name);

        //Attach an adapter to the top spinner
        ArrayAdapter<CharSequence> a = ArrayAdapter.createFromResource(this, R.array.cc_components, android.R.layout.simple_spinner_item);
        a.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mCompSelect.setAdapter(a);
        //Create a listener when the top spinner is clicked
        mCompSelect.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                //Save the position
                mComponent = position;
                //Create a new adapter to attach to the bottom spinner based on the position of the top spinner
                int resourceId = Builder.this.getResources().getIdentifier("component"+Integer.toString(mComponent)+"_color", "array", Builder.this.getPackageName());      
                ArrayAdapter<CharSequence> a = ArrayAdapter.createFromResource(Builder.this, resourceId, android.R.layout.simple_spinner_item);
                a.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                mNameSelect.setAdapter(a);
                //Set the position of the bottom spinner to the saved position
                mNameSelect.setSelection(mCompColorAsBuilt[mComponent]);
            }
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

        //Attach an adapter to the bottom spinner
        int resourceId = this.getResources().getIdentifier("component"+Integer.toString(mComponent)+"_color", "array", this.getPackageName());      
        ArrayAdapter<CharSequence> b = ArrayAdapter.createFromResource(this, resourceId, android.R.layout.simple_spinner_item);
        b.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mNameSelect.setAdapter(b);
        mNameSelect.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {       
                //Save the position of the bottom spinner
                mCompColorAsBuilt[mComponent] = position;
            }
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
    }
}

XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <Spinner
        android:id="@+id/component"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@+id/finish"
        android:drawSelectorOnTop="true"
        android:prompt="@string/component_spinner" />

    <LinearLayout
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <Spinner
            android:id="@+id/component_name"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:drawSelectorOnTop="true"
            android:prompt="@string/component_name_spinner" />
    </LinearLayout>
</RelativeLayout>

Answer 1

作为 hack，尝试在受影响的 Spinner 上调用 invalidate()。首先，在调用 setSelection() 后尝试。如果失败，请尝试在 Spinner 上使用 postDelayed() 稍后调用 invalidate()(例如，50 毫秒)。

此外，我鼓励您创建一个演示项目，其中包含两个 Activity (或者可能只是一个 Activity 具有两个布局)来说明此行为，并将其和解释发布到 http://b.android.com .