Android EditText的输入监听，输入字符的动态获取

时间：2023-03-08 16:12:35

http://itindex.net/detail/38974-android-edittext-%E7%9B%91%E5%90%AC

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：

<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：

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;

    }

}

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