有时候我们可能会用到时时的监听EditText输入字符的时时监听，监听字符的个数，做一些正则表达式的处理等。如下方法可以实现：
我做的是时时的把EditeText输入的数据同步到TextView上
布局文件：
[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代码：
[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;
}
}
作者：com360
