Android EditText的輸入監聽，輸入字符的動態獲取

有時候我們可能會用到時時的監聽EditText輸入字符的時時監聽，監聽字符的個數，做一些正則表達式的處理等。如下方法可以實現：

我做的是時時的把EditeText輸入的數據同步到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代碼：
[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