blocks|key|3044569|text|您可能需要为每个EditTexts提供一个键侦听器，以便在每个键事件之后，您可以刷新字段的值并提供一个新的计算。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3044570|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You may need to provide a key listener to each of your EditTexts, such that after each key event you can refresh your values for the fields and present a new calculation.

blocks|key|2686533|text|您需要添加两个TextViews，并为它们注册一个已更改的监听程序文本。无论何时文本发生变化，您都可以验证输入、计算和更新显示。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2686534|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/widget/TextView.html#addTextChangedListener%2528android.text.TextWatcher%2529^0|T|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You need to add two TextViews and register a text changed <a href="http://developer.android.com/reference/android/widget/TextView.html#addTextChangedListener%28android.text.TextWatcher%29" rel="nofollow">listener</a> for them. whenever the text changes, you can validate input, do the calculation and update the display.

blocks|key|1489871|text|如果您希望自动引发任何事件，则需要向该视图组件添加适当的侦听器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1489872|edittext1.addTextChangedListener(new+TextWatcher(){

++++++++++++++++++++++++++++++++++++++++public+void+afterTextChanged(
++++++++++++++++++++++++++++++++++++++++++++++++Editable+arg0)+{
++++++++++++++++++++++++++++++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++++++++++++++++++++++++++++++}

++++++++++++++++++++++++++++++++++++++++public+void+beforeTextChanged(
++++++++++++++++++++++++++++++++++++++++++++++++CharSequence+s,+int+start,
++++++++++++++++++++++++++++++++++++++++++++++++int+count,+int+after)+{
++++++++++++++++++++++++++++++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++++++++++++++++++++++++++++++}

++++++++++++++++++++++++++++++++++++++++public+void+onTextChanged(
++++++++++++++++++++++++++++++++++++++++++++++++CharSequence+s,+int+start,
++++++++++++++++++++++++++++++++++++++++++++++++int+before,+int+count)+{
++++++++++++++++++++++++++++++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++++++++++++++++++++++++++++++}

++++++++++++++++++++++++++++++++++++});
edittext2.addTextChangedListener(new+TextWatcher(){

++++++++++++++++++++++++++++++++++++++++public+void+afterTextChanged(
++++++++++++++++++++++++++++++++++++++++++++++++Editable+arg0)+{
++++++++++++++++++++++++++++++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++++++++++++++++++++++++++++++}

++++++++++++++++++++++++++++++++++++++++public+void+beforeTextChanged(
++++++++++++++++++++++++++++++++++++++++++++++++CharSequence+s,+int+start,
++++++++++++++++++++++++++++++++++++++++++++++++int+count,+int+after)+{
++++++++++++++++++++++++++++++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++++++++++++++++++++++++++++++}

++++++++++++++++++++++++++++++++++++++++public+void+onTextChanged(
++++++++++++++++++++++++++++++++++++++++++++++++CharSequence+s,+int+start,
++++++++++++++++++++++++++++++++++++++++++++++++int+before,+int+count)+{
++++++++++++++++++++++++++++++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++++++++++++++++++++++++++++++}

++++++++++++++++++++++++++++++++++++});|code-block|syntax|javascript|1489873|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If u want to raise any event automatically,you need to add the appropriate listeners to that view component

<pre><code>edittext1.addTextChangedListener(new TextWatcher(){

 public void afterTextChanged(
 Editable arg0) {
 // TODO Auto-generated method stub

 }

 public void beforeTextChanged(
 CharSequence s, int start,
 int count, int after) {
 // TODO Auto-generated method stub

 }

 public void onTextChanged(
 CharSequence s, int start,
 int before, int count) {
 // TODO Auto-generated method stub

 }

 });
edittext2.addTextChangedListener(new TextWatcher(){

 public void afterTextChanged(
 Editable arg0) {
 // TODO Auto-generated method stub

 }

 public void beforeTextChanged(
 CharSequence s, int start,
 int count, int after) {
 // TODO Auto-generated method stub

 }

 public void onTextChanged(
 CharSequence s, int start,
 int before, int count) {
 // TODO Auto-generated method stub

 }

 });
</code></pre>

blocks|key|1489887|text|这是add_two_numbers.xml布局|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1489888|<?xml+version="1.0"+encoding="utf-8"?>
<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++android:orientation="vertical"
++++android:layout_width="fill_parent"
++++android:layout_height="fill_parent"+>
++++<LinearLayout+android:orientation="horizontal"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"+>
++++++++<TextView+android:text="First+Number+:+"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"+/>
++++++++<EditText+android:id="@%2Bid/editText1"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"+/>
++++</LinearLayout>
++++<LinearLayout+android:orientation="horizontal"
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"+>
++++++++<TextView+android:text="Second+Number+:+"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"+/>
++++++++<EditText+android:id="@%2Bid/editText2"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"+/>
++++</LinearLayout>
++++<LinearLayout+android:orientation="horizontal"
++++android:layout_gravity="center"+++++
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"+>
++++++++<TextView+android:text="Result"
++++++++android:id="@%2Bid/textView_result"++++++++
++++++++android:textColor="#FF00FF"
++++++++android:textSize="18dip"
++++++++android:layout_width="wrap_content"
++++++++android:layout_height="wrap_content"+/>+++++
++++</LinearLayout>
</LinearLayout>|code-block|syntax|javascript|1489889|下面是一个活动AddTwoNumbers.java|1489890|public+class+AddTwoNumbers+extends+Activity+{

++++EditText+editText1;
++++EditText+editText2;
++++TextView+textViewResult;

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

+++++++++editText1+=+(EditText)+findViewById(R.id.editText1);
+++++++++editText2+=+(EditText)+findViewById(R.id.editText2);
+++++++++textViewResult+=+(TextView)+findViewById(R.id.textView_result);

+++++++++editText1.addTextChangedListener(new+TextWatcher()+{

+++++++++++++public+void+beforeTextChanged(CharSequence+s,+int+start,+int+count,
+++++++++++++++++++++int+after)+{
+++++++++++++++++//+TODO+Auto-generated+method+stub++++++++++++++
+++++++++++++}

+++++++++++++public+void+onTextChanged(CharSequence+s,+int+start,+int+before,
+++++++++++++++++++++int+count)+{
+++++++++++++++++textViewResult.setText(addNumbers());+++++++++++++
+++++++++++++}

+++++++++++++public+void+afterTextChanged(Editable+s)+{
+++++++++++++++++//+TODO+Auto-generated+method+stub++++++++++++++
+++++++++++++}+++++++++++++
+++++++++});+

+++++++++editText2.addTextChangedListener(new+TextWatcher()+{

++++++++++++public+void+beforeTextChanged(CharSequence+s,+int+start,+int+count,
++++++++++++++++++++int+after)+{
++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++}

++++++++++++public+void+onTextChanged(CharSequence+s,+int+start,+int+before,
++++++++++++++++++++int+count)+{
++++++++++++++++textViewResult.setText(addNumbers());+

++++++++++++}

++++++++++++public+void+afterTextChanged(Editable+s)+{
++++++++++++++++//+TODO+Auto-generated+method+stub

++++++++++++}
+++++++++});+
++++}

++++private+String+addNumbers()+{
++++++++int+number1;+
++++++++int+number2;
++++++++if(editText1.getText().toString()+!=+""+&&+editText1.getText().length()+>+0)+{
++++++++++++number1+=+Integer.parseInt(editText1.getText().toString());
++++++++}+else+{
++++++++++++number1+=+0;
++++++++}
++++++++if(editText2.getText().toString()+!=+""+&&+editText2.getText().length()+>+0)+{
++++++++++++number2+=+Integer.parseInt(editText2.getText().toString());
++++++++}+else+{
++++++++++++number2+=+0;
++++++++}

++++++++return+Integer.toString(number1+%2B+number2);
++++}
}|1489891|我已经在2.3平台上进行了测试。它很好用。|1489892|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Here is add_two_numbers.xml layout

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent" &gt;
 &lt;LinearLayout android:orientation="horizontal"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" &gt;
 &lt;TextView android:text="First Number : "
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" /&gt;
 &lt;EditText android:id="@+id/editText1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" /&gt;
 &lt;/LinearLayout&gt;
 &lt;LinearLayout android:orientation="horizontal"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" &gt;
 &lt;TextView android:text="Second Number : "
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" /&gt;
 &lt;EditText android:id="@+id/editText2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" /&gt;
 &lt;/LinearLayout&gt;
 &lt;LinearLayout android:orientation="horizontal"
 android:layout_gravity="center" 
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" &gt;
 &lt;TextView android:text="Result"
 android:id="@+id/textView_result" 
 android:textColor="#FF00FF"
 android:textSize="18dip"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" /&gt; 
 &lt;/LinearLayout&gt;
&lt;/LinearLayout&gt;
</code></pre>

And here is an Activity AddTwoNumbers.java

<pre><code>public class AddTwoNumbers extends Activity {

 EditText editText1;
 EditText editText2;
 TextView textViewResult;

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

 editText1 = (EditText) findViewById(R.id.editText1);
 editText2 = (EditText) findViewById(R.id.editText2);
 textViewResult = (TextView) findViewById(R.id.textView_result);

 editText1.addTextChangedListener(new TextWatcher() {

 public void beforeTextChanged(CharSequence s, int start, int count,
 int after) {
 // TODO Auto-generated method stub 
 }

 public void onTextChanged(CharSequence s, int start, int before,
 int count) {
 textViewResult.setText(addNumbers()); 
 }

 public void afterTextChanged(Editable s) {
 // TODO Auto-generated method stub 
 } 
 }); 

 editText2.addTextChangedListener(new TextWatcher() {

 public void beforeTextChanged(CharSequence s, int start, int count,
 int after) {
 // TODO Auto-generated method stub

 }

 public void onTextChanged(CharSequence s, int start, int before,
 int count) {
 textViewResult.setText(addNumbers()); 

 }

 public void afterTextChanged(Editable s) {
 // TODO Auto-generated method stub

 }
 }); 
 }

 private String addNumbers() {
 int number1; 
 int number2;
 if(editText1.getText().toString() != "" &amp;&amp; editText1.getText().length() &gt; 0) {
 number1 = Integer.parseInt(editText1.getText().toString());
 } else {
 number1 = 0;
 }
 if(editText2.getText().toString() != "" &amp;&amp; editText2.getText().length() &gt; 0) {
 number2 = Integer.parseInt(editText2.getText().toString());
 } else {
 number2 = 0;
 }

 return Integer.toString(number1 + number2);
 }
}
</code></pre>

And I have tested it on 2.3 platform. It's working fine.

I'm making an app where i want to automatically make an calculation.
the numbers 1 and 2 are EditText, number 3 is a TextView.
when i fill in the numbers 1 and 2, i want it to automatically sum up and show a result in the TextView. in this example 1+2=3
How to set up an activity for this
i made an xml example:
<img src="https://i.stack.imgur.com/aKTB3.png" alt="enter image description here" />

Automatic calculation

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在做一个应用程序，我想自动做一个计算。数字1和2是EditText，3是TextView。当我填写数字1和2时，我希望它能够自动地对进行汇总，并在TextView中显示结果。在本例中，1+2=3如何设置此的活动我做了一个xml示例：​​

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