blocks|key|408186|text|使用文本监视器，当用户输入%2B3时，它将以%2B374结束，并比较前四个字符，如果相同，则禁用软键盘的反向按键，以便它不会更改文本，并输入附加到文本监视器中的文本的另一个数字|type|unstyled|depth|inlineStyleRanges|entityRanges|data|408187|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|$]]

Use Text watcher and when user enters +3 it completes with +374 and it compares the first four characters and if it is same disable the back press of the softkeyboard so that it will not change the text and enters the other digit which append for the text used from the textwatcher

blocks|key|3450768|text|public+class+MainActivity+extends+Activity+{

private+EditText+editText;

@Override
protected+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
++++setContentView(R.layout.activity_main);
++++editText+=+(EditText)+findViewById(R.id.editText1);
++++editText.setText("%2B374");
++++Selection.setSelection(editText.getText(),+editText.getText().length());
++++editText.addTextChangedListener(new+TextWatcher()+{

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

++++++++}

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

++++++++}

++++++++@Override
++++++++public+void+afterTextChanged(Editable+s)+{
++++++++++++if+(!s.toString().startsWith("%2B374"))+{
++++++++++++++++editText.setText("%2B374");
++++++++++++++++Selection.setSelection(editText.getText(),+editText
++++++++++++++++++++++++.getText().length());

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

++++++++}

++++});
}

}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3450769|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

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

private EditText editText;

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 editText = (EditText) findViewById(R.id.editText1);
 editText.setText("+374");
 Selection.setSelection(editText.getText(), editText.getText().length());
 editText.addTextChangedListener(new TextWatcher() {

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

 }

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

 }

 @Override
 public void afterTextChanged(Editable s) {
 if (!s.toString().startsWith("+374")) {
 editText.setText("+374");
 Selection.setSelection(editText.getText(), editText
 .getText().length());

 }

 }

 });
}

}
</code></pre>

blocks|key|405194|text|创建一个自定义的可绘制类，它有助于将文本转换为可绘制的文本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|405195|public+class+TextDrawable+extends+Drawable+{

++private+final+String+text;
++private+final+Paint+paint;

++public+TextDrawable(String+text)+{
++++++this.text+=+text;
++++++this.paint+=+new+Paint();
++++++paint.setColor(Color.BLACK);
++++++paint.setTextSize(16f);
++++++paint.setAntiAlias(true);
++++++paint.setTextAlign(Paint.Align.LEFT);
++}

++@Override
++public+void+draw(Canvas+canvas)+{
++++++canvas.drawText(text,+0,+6,+paint);
++}

++@Override
++public+void+setAlpha(int+alpha)+{
++++++paint.setAlpha(alpha);
++}

++@Override
++public+void+setColorFilter(ColorFilter+cf)+{
++++++paint.setColorFilter(cf);
++}

++@Override
++public+int+getOpacity()+{
++++++return+PixelFormat.TRANSLUCENT;
++}
}|code-block|syntax|javascript|405196|然后将edittext左侧的可绘制设置为|405197|EditText+et+=+(EditText)findViewById(R.id.editText1);
String+code+=+"%2B374";
et.setCompoundDrawablesWithIntrinsicBounds(new+TextDrawable(code),+null,+null,+null);
et.setCompoundDrawablePadding(code.length()*10);|405198|其中edittext在布局文件中定义为|405199|<EditText
android:id="@%2Bid/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="16sp"
android:ems="10"+>
++<requestFocus+/>
</EditText>|405200|最终输出如下所示|405201|​|405202|📷|atomic|offset|length|405203|405204|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/8e8ffadd34cce4be3fa29cf14877dbac.png|imageAlt^0|0|0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|19|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1B|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1C|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1D|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1E|8|@]|9|@]|A|$]]|$1|S|3|T|5|U|7|1F|8|@]|9|@$V|1G|W|1H|1|1I]]|A|$]]|$1|X|3|R|5|6|7|1J|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15|16|-4]]]]

Create a custom drawable class that will help to convert text into drawable.

<pre><code>public class TextDrawable extends Drawable {

 private final String text;
 private final Paint paint;

 public TextDrawable(String text) {
 this.text = text;
 this.paint = new Paint();
 paint.setColor(Color.BLACK);
 paint.setTextSize(16f);
 paint.setAntiAlias(true);
 paint.setTextAlign(Paint.Align.LEFT);
 }

 @Override
 public void draw(Canvas canvas) {
 canvas.drawText(text, 0, 6, paint);
 }

 @Override
 public void setAlpha(int alpha) {
 paint.setAlpha(alpha);
 }

 @Override
 public void setColorFilter(ColorFilter cf) {
 paint.setColorFilter(cf);
 }

 @Override
 public int getOpacity() {
 return PixelFormat.TRANSLUCENT;
 }
}
</code></pre>

Then set the drawable to left of the edittext as

<pre><code>EditText et = (EditText)findViewById(R.id.editText1);
String code = "+374";
et.setCompoundDrawablesWithIntrinsicBounds(new TextDrawable(code), null, null, null);
et.setCompoundDrawablePadding(code.length()*10);
</code></pre>

Where the edittext is defined in the layout file as

<pre><code>&lt;EditText
android:id="@+id/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="16sp"
android:ems="10" &gt;
 &lt;requestFocus /&gt;
&lt;/EditText&gt;
</code></pre>

Final Output looks like

<img src="https://i.stack.imgur.com/qSAYN.png" alt="enter image description here">

blocks|key|408226|text|您可以创建扩展类AppCompatEditText或EditText。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|408227|public+class+CEditTextMaster+extends+AppCompatEditText+{

++++++++private+boolean+isNeedNoChangeSomeCharacters;
++++++++private+String+charactersNoChange;

++++++++public+CEditTextMaster(Context+context)+{
++++++++++++super(context);
++++++++++++init(context,+null);
++++++++}

++++++++public+CEditTextMaster(Context+context,+AttributeSet+attrs)+{
++++++++++++super(context,+attrs);
++++++++++++init(context,+attrs);
++++++++}

++++++++public+CEditTextMaster(Context+context,+AttributeSet+attrs,+int+defStyleAttr)+{
++++++++++++super(context,+attrs,+defStyleAttr);
++++++++++++init(context,+attrs);
++++++++}

++++++++public+void+init(Context+context,+@Nullable+AttributeSet+attrs)+{

++++++++++++if+(isInEditMode())
++++++++++++++++return;

++++++++++++addTextChangedListener(new+TextWatcher()+{
++++++++++++++++@Override
++++++++++++++++public+void+beforeTextChanged(CharSequence+s,+int+start,+int+count,+int+after)+{

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

++++++++++++++++@Override
++++++++++++++++public+void+onTextChanged(CharSequence+s,+int+start,+int+before,+int+count)+{

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

++++++++++++++++@Override
++++++++++++++++public+void+afterTextChanged(Editable+s)+{
++++++++++++++++++++if+(isNeedNoChangeSomeCharacters+&&+charactersNoChange+!=+null)+{
++++++++++++++++++++++++if+(!getText().toString().startsWith(charactersNoChange))+{
++++++++++++++++++++++++++++removeTextChangedListener(this);
++++++++++++++++++++++++++++if+(charactersNoChange.length()+>+s.length())+{
++++++++++++++++++++++++++++++++setText(charactersNoChange);
++++++++++++++++++++++++++++}+else+{
++++++++++++++++++++++++++++++++setText(charactersNoChange+%2B+getText());
++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++setSelection(getText().toString().length());
++++++++++++++++++++++++++++addTextChangedListener(this);
++++++++++++++++++++++++}
++++++++++++++++++++}
++++++++++++++++}
++++++++++++});

++++++++}

++++++++@Override
++++++++protected+void+onSelectionChanged(int+selStart,+int+selEnd)+{
++++++++++++if+(isNeedNoChangeSomeCharacters+&&+charactersNoChange+!=+null)+{
++++++++++++++++if+(length()+>+charactersNoChange.length()+&&+selStart+<+charactersNoChange.length())+{
++++++++++++++++++++setSelection(charactersNoChange.length(),selEnd);
++++++++++++++++}
++++++++++++}
++++++++}


++++++++@Override
++++++++public+void+setText(CharSequence+text,+BufferType+type)+{
++++++++++++super.setText(text,+type);
++++++++++++if+(isNeedNoChangeSomeCharacters+&&+charactersNoChange+!=+null)+{
++++++++++++++++if+(!getText().toString().trim().startsWith(charactersNoChange))+{
++++++++++++++++++++setText(charactersNoChange+%2B+getText());
++++++++++++++++}
++++++++++++}
++++++++}

++++++++public+void+setCharactersNoChangeInitial(String+charactersNoChange)+{
++++++++++++isNeedNoChangeSomeCharacters+=+true;
++++++++++++this.charactersNoChange+=+charactersNoChange;
++++++++++++if+(!getText().toString().trim().startsWith(charactersNoChange))+{
++++++++++++++++setText(getText());
++++++++++++}
++++++++}

}|code-block|syntax|javascript|408228|使用方法：|408229|edt.setCharactersNoChangeInitial("%2B734+");|408230|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

you can create class extend AppCompatEditText or EditText.

<pre><code>public class CEditTextMaster extends AppCompatEditText {

 private boolean isNeedNoChangeSomeCharacters;
 private String charactersNoChange;

 public CEditTextMaster(Context context) {
 super(context);
 init(context, null);
 }

 public CEditTextMaster(Context context, AttributeSet attrs) {
 super(context, attrs);
 init(context, attrs);
 }

 public CEditTextMaster(Context context, AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 init(context, attrs);
 }

 public void init(Context context, @Nullable AttributeSet attrs) {

 if (isInEditMode())
 return;

 addTextChangedListener(new TextWatcher() {
 @Override
 public void beforeTextChanged(CharSequence s, int start, int count, int after) {

 }

 @Override
 public void onTextChanged(CharSequence s, int start, int before, int count) {

 }

 @Override
 public void afterTextChanged(Editable s) {
 if (isNeedNoChangeSomeCharacters &amp;&amp; charactersNoChange != null) {
 if (!getText().toString().startsWith(charactersNoChange)) {
 removeTextChangedListener(this);
 if (charactersNoChange.length() &gt; s.length()) {
 setText(charactersNoChange);
 } else {
 setText(charactersNoChange + getText());
 }
 setSelection(getText().toString().length());
 addTextChangedListener(this);
 }
 }
 }
 });

 }

 @Override
 protected void onSelectionChanged(int selStart, int selEnd) {
 if (isNeedNoChangeSomeCharacters &amp;&amp; charactersNoChange != null) {
 if (length() &gt; charactersNoChange.length() &amp;&amp; selStart &lt; charactersNoChange.length()) {
 setSelection(charactersNoChange.length(),selEnd);
 }
 }
 }


 @Override
 public void setText(CharSequence text, BufferType type) {
 super.setText(text, type);
 if (isNeedNoChangeSomeCharacters &amp;&amp; charactersNoChange != null) {
 if (!getText().toString().trim().startsWith(charactersNoChange)) {
 setText(charactersNoChange + getText());
 }
 }
 }

 public void setCharactersNoChangeInitial(String charactersNoChange) {
 isNeedNoChangeSomeCharacters = true;
 this.charactersNoChange = charactersNoChange;
 if (!getText().toString().trim().startsWith(charactersNoChange)) {
 setText(getText());
 }
 }

}
</code></pre>

for use:

<pre><code>edt.setCharactersNoChangeInitial("+734 ");
</code></pre>

blocks|key|3450853|text|我选择了一个解决方案，类似于另一个提交的解决方案，即扩展EditText和修改onSelectionChanged。这将阻止用户甚至进入该区域。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3450854|下面是我使用的代码：|3450855|import+android.content.Context
import+android.text.Editable
import+android.util.AttributeSet
import+androidx.appcompat.widget.AppCompatEditText

class+PrefixEditText(context:+Context,+attrs:+AttributeSet?)+:+AppCompatEditText(context,+attrs)+{
++++private+var+prefix:+String?+=+null

++++fun+setPrefix(prefix:+String)+{
++++++++this.prefix+=+prefix
++++++++setText(prefix)

++++++++addTextChangedListener(object+:+TextWatcher+{
++++++++++++override+fun+beforeTextChanged(s:+CharSequence?,+start:+Int,+count:+Int,+after:+Int)+=+Unit
++++++++++++override+fun+onTextChanged(s:+CharSequence?,+start:+Int,+before:+Int,+count:+Int)+=+Unit

++++++++++++override+fun+afterTextChanged(s:+Editable?)+{
++++++++++++++++//+Block+deleting+the+prefix
++++++++++++++++if+(s?.startsWith(prefix)+==+false)+{
++++++++++++++++++++setText(prefix)
++++++++++++++++}
++++++++++++}
++++++++})
++++}

++++override+fun+onSelectionChanged(selStart:+Int,+selEnd:+Int)+{
++++++++var+newStart+=+selStart
++++++++var+newEnd+=+selEnd
++++++++prefix?.length?.let+{
++++++++++++newStart+=+if+(selStart+<+it)+it+else+selStart
++++++++++++newEnd+=+if+(selEnd+<+it)+it+else+selEnd
++++++++}

++++++++if+(selStart+!=+newStart+%7C%7C+selEnd+!=+newEnd)+{
++++++++++++setSelection(newStart,+newEnd)
++++++++}+else+{
++++++++++++super.onSelectionChanged(selStart,+selEnd)
++++++++}
++++}

++++//+Here+to+conform+to+EditText's+API
++++//+Could+also+just+override+getText()
++++fun+getPostText():+Editable?+{
++++++++return+prefix?.let+{
++++++++++++Editable.Factory.getInstance().newEditable(text)?.delete(0,+it.length)
++++++++}+?:+run+{
++++++++++++text
++++++++}
++++}

++++//+Here+for+convenience,+to+avoid+instantiating+a+new+Editable,+if+the+text+is+all+you+need
++++fun+getPostCharSeq():+CharSequence?+{
++++++++return+prefix?.let+{
++++++++++++text?.substring(it.length)
++++++++}+?:+run+{
++++++++++++text
++++++++}
++++}
}|code-block|syntax|javascript|3450856|使用测试：|3450857|import+android.view.ViewGroup
import+android.widget.FrameLayout
import+androidx.test.ext.junit.runners.AndroidJUnit4
import+androidx.test.rule.ActivityTestRule
import+com.roosterteeth.roosterteeth.TestActivity
import+org.junit.Assert
import+org.junit.Rule
import+org.junit.Test
import+org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)
class+PrefixEditTextTest+{
++++@Rule
++++@JvmField
++++var+activityRule:+ActivityTestRule<TestActivity>+=+ActivityTestRule(TestActivity::class.java,+true,+true)

++++private+fun+setupView(prefix:+String,+message:+String):+PrefixEditText+{
++++++++val+editText+=+PrefixEditText(activityRule.activity,+null)
++++++++val+lp+=+FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,+ViewGroup.LayoutParams.MATCH_PARENT)
++++++++activityRule.activity.addContentView(editText,+lp)

++++++++editText.setPrefix(prefix)
++++++++editText.append(message)

++++++++return+editText
++++}

++++@Test
++++fun+testSelection()+{
++++++++activityRule.runOnUiThread+{
++++++++++++val+prefix+=+"pre:+"
++++++++++++val+message+=+"hello+world"
++++++++++++val+editText+=+setupView(prefix,+message)

++++++++++++editText.setSelection(0)
++++++++++++Assert.assertEquals(editText.selectionStart,+prefix.length)
++++++++++++Assert.assertEquals(editText.selectionEnd,+prefix.length)
++++++++++++editText.setSelection(0,+editText.length())
++++++++++++Assert.assertEquals(editText.selectionStart,+prefix.length)
++++++++++++Assert.assertEquals(editText.selectionEnd,+editText.length())
++++++++}
++++}

++++@Test
++++fun+testGetPostText()+{
++++++++activityRule.runOnUiThread+{
++++++++++++val+prefix+=+"pre:+"
++++++++++++val+message+=+"hello+world"
++++++++++++val+editText+=+setupView(prefix,+message)

++++++++++++Assert.assertEquals(message,+editText.getPostText().toString())
++++++++++++//+This+test+is+after+to+make+sure+that+getting+the+post+text+did+not+actually+modify+the+contents
++++++++++++Assert.assertEquals("pre:+$message",+editText.text.toString())
++++++++}
++++}

++++@Test
++++fun+testGetPostCharSeq()+{
++++++++activityRule.runOnUiThread+{
++++++++++++val+prefix+=+"pre:+"
++++++++++++val+message+=+"hello+world"
++++++++++++val+editText+=+setupView(prefix,+message)

++++++++++++Assert.assertEquals(message,+editText.getPostCharSeq())
++++++++++++//+This+test+is+after+to+make+sure+that+getting+the+post+text+did+not+actually+modify+the+contents
++++++++++++Assert.assertEquals("pre:+$message",+editText.text.toString())
++++++++}
++++}
}|3450858|entityMap^0|S|8|13|I|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|R|$]]

I opted for a solution, similar to another one submitted, of extending <code>EditText</code> and modifying <code>onSelectionChanged</code>. This prevents the user from even entering that region.

Here's what I'm using:

<pre><code>import android.content.Context
import android.text.Editable
import android.util.AttributeSet
import androidx.appcompat.widget.AppCompatEditText

class PrefixEditText(context: Context, attrs: AttributeSet?) : AppCompatEditText(context, attrs) {
 private var prefix: String? = null

 fun setPrefix(prefix: String) {
 this.prefix = prefix
 setText(prefix)

 addTextChangedListener(object : TextWatcher {
 override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) = Unit
 override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) = Unit

 override fun afterTextChanged(s: Editable?) {
 // Block deleting the prefix
 if (s?.startsWith(prefix) == false) {
 setText(prefix)
 }
 }
 })
 }

 override fun onSelectionChanged(selStart: Int, selEnd: Int) {
 var newStart = selStart
 var newEnd = selEnd
 prefix?.length?.let {
 newStart = if (selStart &lt; it) it else selStart
 newEnd = if (selEnd &lt; it) it else selEnd
 }

 if (selStart != newStart || selEnd != newEnd) {
 setSelection(newStart, newEnd)
 } else {
 super.onSelectionChanged(selStart, selEnd)
 }
 }

 // Here to conform to EditText's API
 // Could also just override getText()
 fun getPostText(): Editable? {
 return prefix?.let {
 Editable.Factory.getInstance().newEditable(text)?.delete(0, it.length)
 } ?: run {
 text
 }
 }

 // Here for convenience, to avoid instantiating a new Editable, if the text is all you need
 fun getPostCharSeq(): CharSequence? {
 return prefix?.let {
 text?.substring(it.length)
 } ?: run {
 text
 }
 }
}
</code></pre>

With tests:

<pre><code>import android.view.ViewGroup
import android.widget.FrameLayout
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.rule.ActivityTestRule
import com.roosterteeth.roosterteeth.TestActivity
import org.junit.Assert
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)
class PrefixEditTextTest {
 @Rule
 @JvmField
 var activityRule: ActivityTestRule&lt;TestActivity&gt; = ActivityTestRule(TestActivity::class.java, true, true)

 private fun setupView(prefix: String, message: String): PrefixEditText {
 val editText = PrefixEditText(activityRule.activity, null)
 val lp = FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
 activityRule.activity.addContentView(editText, lp)

 editText.setPrefix(prefix)
 editText.append(message)

 return editText
 }

 @Test
 fun testSelection() {
 activityRule.runOnUiThread {
 val prefix = "pre: "
 val message = "hello world"
 val editText = setupView(prefix, message)

 editText.setSelection(0)
 Assert.assertEquals(editText.selectionStart, prefix.length)
 Assert.assertEquals(editText.selectionEnd, prefix.length)
 editText.setSelection(0, editText.length())
 Assert.assertEquals(editText.selectionStart, prefix.length)
 Assert.assertEquals(editText.selectionEnd, editText.length())
 }
 }

 @Test
 fun testGetPostText() {
 activityRule.runOnUiThread {
 val prefix = "pre: "
 val message = "hello world"
 val editText = setupView(prefix, message)

 Assert.assertEquals(message, editText.getPostText().toString())
 // This test is after to make sure that getting the post text did not actually modify the contents
 Assert.assertEquals("pre: $message", editText.text.toString())
 }
 }

 @Test
 fun testGetPostCharSeq() {
 activityRule.runOnUiThread {
 val prefix = "pre: "
 val message = "hello world"
 val editText = setupView(prefix, message)

 Assert.assertEquals(message, editText.getPostCharSeq())
 // This test is after to make sure that getting the post text did not actually modify the contents
 Assert.assertEquals("pre: $message", editText.text.toString())
 }
 }
}
</code></pre>

I have some EditText for mobile number input. App must add unique text for every country. For example for Armenia is must add <code>+374</code> , and user must fill other numbers. Also <code>+374</code> must be unchangeable, user can't change or remove it. So is there some kind of ways for doing this?<img src="https://i.stack.imgur.com/aoaAj.png" alt="enter image description here">

EDIT:

I don't want to use textView or another view with this text and put it left of the ediText. I want to find some way with less operations. I need text to be frozen not to check every text changes or add missing text when user will delete some part of it.

Set unchangeable some part of editText android

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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我有一些用于手机号码输入的EditText。应用程序必须添加每个国家的唯一文本。例如，对于亚美尼亚，is必须添加+374，而用户必须填写其他数字。此外，+374必须是不可更改的，用户不能更改或删除它。那么有没有什么方法可以做到这一点呢？​编辑：我不想在此文本中使用textView或其他视图，并将其放在ediText的左...

问将editText安卓的某些部分设置为不可更改
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问将editText安卓的某些部分设置为不可更改
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