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我有一个类，我已将其定义为 EditText 的扩展/我用它来解决我们一直遇到的问题，因为没有出现右对齐提示。因此，我编写了自己的代码，在内部实现了提示。

其中，我重写了 getText 方法，以便在值等于提示的情况下返回 null。问题是 getText 被不停地调用。它不是递归调用的。我在那里放了一个计数器，它肯定会在执行下一个呼叫之前退出一个呼叫。

    @Override
public Editable getText(){
    depth++;
    calls++;
    Log.d("RightJustifiedEditText","getText  - start. Depth =  " + depth + "   calls = " + calls);
    Editable result = (isEmpty?Editable.Factory.getInstance().newEditable(hint):super.getText());
    depth--;
    Log.d("RightJustifiedEditText","getText  - return: " + result + "    Depth = " + depth);
    return result;
}

当我运行它时，“深度”的值每次显示为 1，然后显示为 0。“电话”的价值不断上升。

如果我删除“super.getText（）”并在其位置放置一个常量，那么它似乎没问题。

从我在调试跟踪中可以看到，它是从布局中调用的：

RightJustifiedEditText.getText() line: 115  
RightJustifiedEditText(EditText).getText() line: 48 
RightJustifiedEditText(TextView).getSelectionStart() line: 5892 
RightJustifiedEditText(TextView).onDraw(Canvas) line: 4057  
RightJustifiedEditText(View).draw(Canvas) line: 6880    
RelativeLayout(ViewGroup).drawChild(Canvas, View, long) line: 1646  
RelativeLayout(ViewGroup).dispatchDraw(Canvas) line: 1373   
TextFieldElement(ViewGroup).drawChild(Canvas, View, long) line: 1644    
TextFieldElement(ViewGroup).dispatchDraw(Canvas) line: 1373 
LinearLayout(ViewGroup).drawChild(Canvas, View, long) line: 1644    
LinearLayout(ViewGroup).dispatchDraw(Canvas) line: 1373 
DoctorSearchElement(ViewGroup).drawChild(Canvas, View, long) line: 1644 
DoctorSearchElement(ViewGroup).dispatchDraw(Canvas) line: 1373  
LinearLayout(ViewGroup).drawChild(Canvas, View, long) line: 1644    
LinearLayout(ViewGroup).dispatchDraw(Canvas) line: 1373 
ScrollView(ViewGroup).drawChild(Canvas, View, long) line: 1644  
ScrollView(ViewGroup).dispatchDraw(Canvas) line: 1373   
ScrollView(View).draw(Canvas) line: 6986    
ScrollView(FrameLayout).draw(Canvas) line: 357  
ScrollView.draw(Canvas) line: 1409  
RelativeLayout(ViewGroup).drawChild(Canvas, View, long) line: 1646  
RelativeLayout(ViewGroup).dispatchDraw(Canvas) line: 1373   
RelativeLayout(View).draw(Canvas) line: 6883    
FrameLayout(ViewGroup).drawChild(Canvas, View, long) line: 1646 
FrameLayout(ViewGroup).dispatchDraw(Canvas) line: 1373  
FrameLayout(View).draw(Canvas) line: 6883   
FrameLayout.draw(Canvas) line: 357  
LinearLayout(ViewGroup).drawChild(Canvas, View, long) line: 1646    
LinearLayout(ViewGroup).dispatchDraw(Canvas) line: 1373 
PhoneWindow$DecorView(ViewGroup).drawChild(Canvas, View, long) line: 1644   
PhoneWindow$DecorView(ViewGroup).dispatchDraw(Canvas) line: 1373    
PhoneWindow$DecorView(View).draw(Canvas) line: 6883 
PhoneWindow$DecorView(FrameLayout).draw(Canvas) line: 357   
PhoneWindow$DecorView.draw(Canvas) line: 1862   
ViewRoot.draw(boolean) line: 1522   
ViewRoot.performTraversals() line: 1258 
ViewRoot.handleMessage(Message) line: 1859  
ViewRoot(Handler).dispatchMessage(Message) line: 99 
Looper.loop() line: 123 
ActivityThread.main(String[]) line: 3683    
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
Method.invoke(Object, Object...) line: 507  
ZygoteInit$MethodAndArgsCaller.run() line: 839  
ZygoteInit.main(String[]) line: 597 
NativeStart.main(String[]) line: not available [native method]

这是直接包含它的布局：

<?xml version="1.0" encoding="UTF-8"?>


<com.applicat.meuchedet.views.RightJustifiedEditText
    android:id="@+id/text_field_element_text_field"
    android:layout_width="170dip"
    android:layout_height="fill_parent"
    android:layout_alignParentLeft="true"
    android:textColor="@color/text_field_color"
    android:textSize="14sp"
    android:layout_marginRight="5dip"
    android:paddingLeft="15dip"
    android:paddingRight="15dip"
    android:gravity="right|center_vertical"
    android:inputType="text"
    android:lines="1"
    android:scrollHorizontally="true"
    android:ellipsize="end"
    android:background="@drawable/text_field_bg"
    />
<TextView
    android:id="@+id/text_field_element_prompt"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_alignParentRight="true"
    android:gravity="center_vertical|right"
    android:layout_centerVertical="true"
    android:textSize="16sp"
    android:singleLine="true"
    />

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