输入框计数Demo

package com.demo;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.widget.EditText;import android.widget.TextView;public class DemoActivity extends Activity {    /** Called when the activity is first created. */private TextView textView = null;private EditText editText = null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                textView = (TextView) findViewById(R.id.textView);        editText = (EditText) findViewById(R.id.editText);        textView.setText("备注(0/100)");        editText.addTextChangedListener(new TextChanedLintener());    }        class TextChanedLintener implements TextWatcher{@Overridepublic void afterTextChanged(Editable s) {}@Overridepublic void beforeTextChanged(CharSequence s, int start, int count,int after) {}@Overridepublic void onTextChanged(CharSequence s, int start, int before,int count) {int length = editText.getText().length();textView.setText("备注("+length+"/100)");}    }    }

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextViewandroid:id="@+id/textView"      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="备注"    /><EditTextandroid:id="@+id/editText"android:layout_width="fill_parent"     android:layout_height="wrap_content"    android:padding="10px"    android:hint="请在这里填写备注信息，最多可以输入100个字符，汉字按一个字符计算。"    android:gravity="top"    android:textSize="14sp"    android:maxLength="100"/></LinearLayout>

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