AppCompatのピット

http://blog.csdn.net/liuxu0703/article/details/70145168
textViewなどのViewを使用する場合、5.0以下のバージョンでandroidは互換性のある処理を行い、AppCompatTextViewを生成します.このようなviewのgetContext()はTineContextWrapperであり、activityまたはinstanceOfActivityの判断に強制的に移行する場合は、予想される操作に合致しません

二つの解決策がある

根本的な解決策はstackoverflowの中の方法を採用して、1つのツールの方法はすべてのviewのgetContext()を交換して、工事の中のこの呼び出しの方式に適用するのは多くなくて、その上修正するリスクの少ないところ

現在の問題の解決方法は、5.0以下で、このような行為を禁止できるかどうかを見て、サポートされています.方法は、私たちのBaseActivityのonCreate()でgetDegate()を呼び出すことです.setCompatVectorFromResourcesEnabled()

ソースコードで見ることができますが、AppCompatActivityのonCreate()にはLayoutInfatorFactoryがインストールされています.ここでは置き換えに使用します.
1) AppCompatDelegateImplV9.onCreateView

 /**
     * From {@link android.support.v4.view.LayoutInflaterFactory}
     */
    @Override
    public final View onCreateView(View parent, String name, Context context, AttributeSet attrs) {
        // First let the Activity's Factory try and inflate the view
        final View view = callActivityOnCreateView(parent, name, context, attrs);
        if (view != null) {
            return view;
        }

        // If the Factory didn't handle it, let our createView() method try
        return createView(parent, name, context, attrs);
    }

2) AppCompatDelegateImplV11.callActivityOnCreateView()

 @Override
    View callActivityOnCreateView(View parent, String name, Context context, AttributeSet attrs) {
        // On Honeycomb+, Activity's private inflater factory will handle calling its
        // onCreateView(...)
        return null;
    }

callActivity OnCreateViewはnullを返し、createView()によって制御されていることがわかりました.
3) AppCompatDelegateImplV9.createView()

 @Override
    public View createView(View parent, final String name, @NonNull Context context,
            @NonNull AttributeSet attrs) {
        if (mAppCompatViewInflater == null) {
            mAppCompatViewInflater = new AppCompatViewInflater();
        }

        boolean inheritContext = false;
        if (IS_PRE_LOLLIPOP) {
            inheritContext = (attrs instanceof XmlPullParser)
                    // If we have a XmlPullParser, we can detect where we are in the layout
                    ? ((XmlPullParser) attrs).getDepth() > 1
                    // Otherwise we have to use the old heuristic
                    : shouldInheritContext((ViewParent) parent);
        }

        return mAppCompatViewInflater.createView(parent, name, context, attrs, inheritContext,
                IS_PRE_LOLLIPOP, /* Only read android:theme pre-L (L+ handles this anyway) */
                true, /* Read read app:theme as a fallback at all times for legacy reasons */
                VectorEnabledTintResources.shouldBeUsed() /* Only tint wrap the context if enabled */
        );
    }  

4) mAppCompatViewInflater.createView()の実装
コードをめくり続けると、view置換のプロセスが表示されますが、ここでは制御されたパラメータも見られます.wrapContextがtrueの場合、置換されます.これがVectorEnabledTintResourcesです.shouldBeUsed()

    public final View createView(View parent, final String name, @NonNull Context context,
            @NonNull AttributeSet attrs, boolean inheritContext,
            boolean readAndroidTheme, boolean readAppTheme, boolean wrapContext) {
        final Context originalContext = context;

        // We can emulate Lollipop's android:theme attribute propagating down the view hierarchy
        // by using the parent's context
        if (inheritContext && parent != null) {
            context = parent.getContext();
        }
        if (readAndroidTheme || readAppTheme) {
            // We then apply the theme on the context, if specified
            context = themifyContext(context, attrs, readAndroidTheme, readAppTheme);
        }
        if (wrapContext) {
            context = TintContextWrapper.wrap(context);
        }

        View view = null;

        // We need to 'inject' our tint aware Views in place of the standard framework versions
        switch (name) {
            case "TextView":
                view = new AppCompatTextView(context, attrs);
                break;
            case "ImageView":
                view = new AppCompatImageView(context, attrs);
                break;
            case "Button":
                view = new AppCompatButton(context, attrs);
                break;
            case "EditText":
                view = new AppCompatEditText(context, attrs);
                break;
            case "Spinner":
                view = new AppCompatSpinner(context, attrs);
                break;
            case "ImageButton":
                view = new AppCompatImageButton(context, attrs);
                break;
            case "CheckBox":
                view = new AppCompatCheckBox(context, attrs);
                break;
            case "RadioButton":
                view = new AppCompatRadioButton(context, attrs);
                break;
            case "CheckedTextView":
                view = new AppCompatCheckedTextView(context, attrs);
                break;
            case "AutoCompleteTextView":
                view = new AppCompatAutoCompleteTextView(context, attrs);
                break;
            case "MultiAutoCompleteTextView":
                view = new AppCompatMultiAutoCompleteTextView(context, attrs);
                break;
            case "RatingBar":
                view = new AppCompatRatingBar(context, attrs);
                break;
            case "SeekBar":
                view = new AppCompatSeekBar(context, attrs);
                break;
        }

        if (view == null && originalContext != context) {
            // If the original context does not equal our themed context, then we need to manually
            // inflate it using the name so that android:theme takes effect.
            view = createViewFromTag(context, name, attrs);
        }

        if (view != null) {
            // If we have created a view, check it's android:onClick
            checkOnClickListener(view, attrs);
        }

        return view;
    }

5) VectorEnabledTintResources.shouldBeUsed()

public static boolean shouldBeUsed() {
        return AppCompatDelegate.isCompatVectorFromResourcesEnabled()
                && Build.VERSION.SDK_INT <= MAX_SDK_WHERE_REQUIRED;
    }

        AppCompatDelegate.isCompatVectorFromResourcesEnabled()

6) AppCompatDelegate.isCompatVectorFromResourcesEnabled()
関連する方法では、これは制御可能であることがわかります.

/**
     * Sets whether vector drawables on older platforms (< API 21) can be used within
     * {@link android.graphics.drawable.DrawableContainer} resources.
     *
     * 
When enabled, AppCompat can intercept some drawable inflation from the framework, which
     * enables implicit inflation of vector drawables within
     * {@link android.graphics.drawable.DrawableContainer} resources. You can then use those
     * drawables in places such as {@code android:src} on {@link android.widget.ImageView},
     * or {@code android:drawableLeft} on {@link android.widget.TextView}. Example usage:
     *
     * 

     * <selector xmlns:android="...">
     *     <item android:state_checked="true"
     *           android:drawable="@drawable/vector_checked_icon" />
     *     <item android:drawable="@drawable/vector_icon" />
     * </selector>
     *
     * <TextView
     *         ...
     *         android:drawableLeft="@drawable/vector_state_list_icon" />
     * 
*
* This feature defaults to disabled, since enabling it can cause issues with memory usage,
* and problems updating {@link Configuration} instances. If you update the configuration
* manually, then you probably do not want to enable this. You have been warned.
*
* Even with this disabled, you can still use vector resources through
* {@link android.support.v7.widget.AppCompatImageView#setImageResource(int)} and it's
* {@code app:srcCompat} attribute. They can also be used in anything which AppCompat inflates
* for you, such as menu resources.
*
* Please note: this only takes effect in Activities created after this call.
*/
public static void setCompatVectorFromResourcesEnabled(boolean enabled) {
sCompatVectorFromResourcesEnabled = enabled;
}
/**
* Returns whether vector drawables on older platforms (< API 21) can be accessed from within
* resources.
*
* @see #setCompatVectorFromResourcesEnabled(boolean)
*/
public static boolean isCompatVectorFromResourcesEnabled() {
return sCompatVectorFromResourcesEnabled;
}
    を つけたのは、BaseActivityでsuper.oncreate()の 、getDegate()を び します.setCompatVectorFromResourcesEnabled(false)この  の   に  してください.それは5.0  のシステムでvectorを  にしたことです.