布局文件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" ><LinearLayoutandroid: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" ><EditTextandroid:id="@+id/searchEditText"android:layout_width="fill_parent"android:layout_height="45sp"android:layout_weight="1"android:hint="搜索"android:imeOptions="actionDone"android:singleLine="true"android:textSize="16sp" /><Buttonandroid: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文件如下：

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);}}}; }

運行實例如下：

界面丑的一米，功能是實現了。

總結

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