android - 自定义 ImageView 未实例化 java.lang.UnsupportedOperationException

Question

正在抛出以下错误。

The following classes could not be instantiated:
- com.m.widget.CustomImageView (Open Class, Show Error Log)
See the Error Log (Window > Show View) for more details.
Tip: Use View.isInEditMode() in your custom views to skip code when shown in Eclipse

java.lang.UnsupportedOperationException: Unsupported Service: accessibility
    at com.android.layoutlib.bridge.android.BridgeContext.getSystemService(BridgeContext.java:448)
    at com.actionbarsherlock.internal.widget.IcsProgressBar.<init>(IcsProgressBar.java:340)
    at com.actionbarsherlock.internal.widget.IcsProgressBar.<init>(IcsProgressBar.java:273)
    at com.actionbarsherlock.internal.widget.IcsProgressBar.<init>(IcsProgressBar.java:269)
    at com.m2catalyst.widget.CustomImageView.<init>(CustomImageView.java:32)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(    at sun.reflect.NativeConstructorAccessorImpl.newInstance(    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(    at java.lang.reflect.Constructor.newInstance(    at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(ProjectCallback.java:413)
    at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:170)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
    at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:135)
    at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:746)
    at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:718)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:372)

Answer 1

错误消息告诉您发生了什么:

at com.actionbarsherlock.internal.widget.IcsProgressBar.(IcsProgressBar.java:340

这与您正在使用的 UI 编辑器不兼容。这样做:

public CustomImageView(Context context) {
    this(context, null);
}


public CustomImageView(Context context, AttributeSet attrs){
    this(context, attrs, 0);
}

public CustomImageView(Context context, AttributeSet attrs, int defStyle){
    super(context, attrs, defStyle);
    imageView = new ImageView(context, attrs, defStyle);
    if (!isInEditMode()) progressBar = new IcsProgressBar(context, attrs, defStyle);
    init();
}

类似的东西应该有所帮助。基本上使用 isInEditoMode 检查 View 是否位于 UI 编辑器中，并且不要运行该模式不支持的代码。