TextWatcher實現一鍵清空EditText，edittext

TextWatcher實現一鍵清空EditText，edittext

布局檔案main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginBottom="5dip"        android:layout_marginLeft="5dip"        android:layout_marginRight="5dip"        android:layout_marginTop="5dip"        android:gravity="center_vertical"        android:orientation="horizontal" >        <EditText            android:id="@+id/searchEditText"            android:layout_width="fill_parent"            android:layout_height="45sp"            android:layout_weight="1"            android:hint="搜尋"            android:imeOptions="actionDone"            android:singleLine="true"            android:textSize="16sp" />        <Button            android:id="@+id/button_clear"            android:layout_width="40sp"            android:layout_height="40sp"            android:layout_marginRight="8dip"            android:background="@drawable/icon_clear"            android:visibility="invisible" />    </LinearLayout></LinearLayout>

.java檔案如下：

package org.lxh.demo;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class Hello extends Activity {EditText searchEditText;Button clearButton;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);searchEditText = (EditText) findViewById(R.id.searchEditText);clearButton = (Button) findViewById(R.id.button_clear);searchEditText.addTextChangedListener(mTextWatcher);clearButton.setOnClickListener(new OnClickListener() {public void onClick(View v) {searchEditText.setText("");}});}TextWatcher mTextWatcher = new TextWatcher() {public void onTextChanged(CharSequence s, int start, int before,int count) {// TODO Auto-generated method stub}public void beforeTextChanged(CharSequence s, int start, int count,int after) {// TODO Auto-generated method stub}public void afterTextChanged(Editable s) {if (searchEditText.getText().toString() != null&& !searchEditText.getText().toString().equals("")) {clearButton.setVisibility(View.VISIBLE);} else {clearButton.setVisibility(View.INVISIBLE);}}};}

運行執行個體如下：

介面醜的一米，功能是實現了。