Question

我正在尝试使用HoloEverywhere类AutoCompleteTextView来处理我的应用。主要原因是我希望Holo主题适用于3.0之前的设备（特别是API级别8-10）这是我的主要活动代码：

package com.example.testautocomp;

import org.holoeverywhere.widget.AutoCompleteTextView;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

public class MainActivity extends Activity {

    private AutoCompleteTextView m_edit;

    private static final String[] items = { "lorem", "ipsum", "dolor", "sit",
        "amet", "consectetuer", "adipiscing", "elit", "morbi", "vel",
        "augue", "purus", "sitter", "sitting", "sither", "sithar" };

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    m_edit = (AutoCompleteTextView)findViewById(R.id.edit2);

    m_edit.setAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_dropdown_item_1line, items));
    }
}

也是我的activity_main.xml代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<AutoCompleteTextView
    android:id="@+id/edit2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:completionThreshold="1"
    android:hint="Testing" />
</LinearLayout>

当我运行我的应用程序时，它进入eclipse的调试器，在按下resume（或F8）继续该线程后，我的应用程序崩溃/强制关闭，我的LogCat中出现以下错误：

04-19 17:52:56.342: W/dalvikvm(675): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
04-19 17:52:56.422: E/AndroidRuntime(675): FATAL EXCEPTION: main
04-19 17:52:56.422: E/AndroidRuntime(675): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testautocomp/com.example.testautocomp.MainActivity}: java.lang.ClassCastException: android.widget.AutoCompleteTextView cannot be cast to org.holoeverywhere.widget.AutoCompleteTextView
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.os.Looper.loop(Looper.java:137)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.ActivityThread.main(ActivityThread.java:4424)
04-19 17:52:56.422: E/AndroidRuntime(675):  at java.lang.reflect.Method.invokeNative(Native Method)
04-19 17:52:56.422: E/AndroidRuntime(675):  at java.lang.reflect.Method.invoke(Method.java:511)
04-19 17:52:56.422: E/AndroidRuntime(675):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-19 17:52:56.422: E/AndroidRuntime(675):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-19 17:52:56.422: E/AndroidRuntime(675):  at dalvik.system.NativeStart.main(Native Method)
04-19 17:52:56.422: E/AndroidRuntime(675): Caused by: java.lang.ClassCastException: android.widget.AutoCompleteTextView cannot be cast to org.holoeverywhere.widget.AutoCompleteTextView
04-19 17:52:56.422: E/AndroidRuntime(675):  at com.example.testautocomp.MainActivity.onCreate(MainActivity.java:22)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.Activity.performCreate(Activity.java:4465)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-19 17:52:56.422: E/AndroidRuntime(675):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-19 17:52:56.422: E/AndroidRuntime(675):  ... 11 more

如何修复此CastClassException？

Answer 1

不，你的行动不正确。您应该在org.holoeverywhere.app.Activity上更改活动基类。

Answer 2

非常类似于此question

通过将main_activity.xml更改为：

来解决此问题

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<org.holoeverywhere.widget.AutoCompleteTextView
    android:id="@+id/edit2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:completionThreshold="1"
    android:hint="Testing" />
</LinearLayout>

主要部分是 org.holoeverywhere.widget.AutoCompleteTextView

HoloEverywhere AutoCompleteTextView java.lang.ClassCastException

2 个答案: