Android EditText input listening, dynamic acquisition of input characters

Sometimes we may use the constant listening for the EditText input characters, the number of listening characters, and some regular expression processing. The following methods can be implemented:

What I do is synchronize the data input by EditeText to TextView from time to time.

Layout file:

[Html]
<RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android"
Xmlns: tools = "http://schemas.android.com/tools"
Android: layout_width = "match_parent"
Android: layout_height = "match_parent">
 
<TextView
Android: id = "@ + id/textview"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: layout_centerHorizontal = "true"
Android: layout_centerVertical = "true"
Android: padding = "@ dimen/padding_medium"
Tools: context = ". Test02Activity"/>
 
<EditText
Android: id = "@ + id/editText1"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: layout_alignLeft = "@ + id/textview"
Android: layout_below = "@ + id/textview"
Android: layout_marginTop = "31dp"
>
 
<RequestFocus/>
</EditText>
 
</RelativeLayout>

Java code:
[Html]
Package com. example. testdemo;
 
Import android. OS. Bundle;
Import android. app. Activity;
Import android. util. Log;
Import android. view. Menu;
Import android. view. MenuItem;
Import android. widget. EditText;
Import android. widget. TextView;
Import android. support. v4.app. NavUtils;
Import android. text. Editable;
Import android. text. TextWatcher;
 
Public class Test02Activity extends Activity {
Private static final String TAG = "Test ";
Private EditText mEditText;
Private TextView mTextView;
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_test02 );
MEditText = (EditText) findViewById (R. id. editText1 );
MTextView = (TextView) findViewById (R. id. textview );

MEditText. addTextChangedListener (new TextWatcher (){
 
@ Override
Public void afterTextChanged (Editable s ){
Log. d (TAG, "afterTextChanged ");
}
 
@ Override
Public void beforeTextChanged (CharSequence s, int start, int count,
Int after ){
Log. d (TAG, "beforeTextChanged:" + s + "-" + start + "-" + count + "-" + after );

}
 
@ Override
Public void onTextChanged (CharSequence s, int start, int before,
Int count ){
Log. d (TAG, "onTextChanged:" + s + "-" + "-" + start + "-" + before + "-" + count );
MTextView. setText (s );
}

});
}
 
@ Override
Public boolean onCreateOptionsMenu (Menu menu ){
GetMenuInflater (). inflate (R. menu. activity_test02, menu );
Return true;
}
 

}

Author: com360