效果图如下：
备注：附带一个隐藏和显示密码的功能实现。
activity_main.xml布局文件的代码如下：
<?xml version="1.0" encoding="utf-8"?><LinearLayout android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:padding="5dp"xmlns:android="/apk/res/android"><com.deepreality.userdefinededittextdemo.DelEditTextandroid:layout_width="match_parent"android:layout_height="40dp"android:hint="带有删除的EditText"android:textSize="14dp"android:background="@drawable/edittext_search"android:maxLength="20"android:paddingRight="10dp"android:paddingLeft="5dp"android:singleLine="true"/><LinearLayout android:layout_width="match_parent"android:layout_height="match_parent"android:layout_marginTop="10dp"android:orientation="horizontal"><EditTextandroid:id="@+id/edit_pawd"android:layout_width="0dp"android:layout_weight="1"android:layout_height="48dp"android:inputType="textPassword"android:background="@drawable/edittext_search"/><CheckBoxandroid:id="@+id/cbChange"android:layout_width="100dp"android:layout_height="48dp"android:text="密码可见"/></LinearLayout></LinearLayout>
其中的EditText样式，自定义一个Shape样式。可以参考之前的安卓开发中TextView的常见用法（总结），如果忘记的话。
布局文件中的EditText是自定义的。DelEditText.java的代码如下：
package com.deepreality.userdefinededittextdemo;import android.content.Context;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.text.Editable;import android.text.TextWatcher;import android.util.AttributeSet;import android.view.MotionEvent;public class DelEditText extends android.support.v7.widget.AppCompatEditText {private Context context;private Drawable drawableDel;public DelEditText(Context context, AttributeSet attrs) {super(context, attrs);this.context = context;init();}private void init() {//给Drawable赋值drawableDel = context.getResources().getDrawable(R.mipmap.edittext_delete);//添加文本内容变化监听事件addTextChangedListener(new TextWatcher() {@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after) {}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count) {}@Overridepublic void afterTextChanged(Editable s) {setDrawable();}});}//绘制删除图片private void setDrawable() {if (length() < 1) {setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);} else {setCompoundDrawablesWithIntrinsicBounds(null, null, drawableDel, null);}}//当触摸范围在右侧时，触发删除方法，隐藏删除图片@Overridepublic boolean onTouchEvent(MotionEvent event) {if (drawableDel != null && event.getAction() == MotionEvent.ACTION_UP) {int eventX = (int) event.getRawX();int eventY = (int) event.getRawY();Rect rect = new Rect();getGlobalVisibleRect(rect);rect.left = rect.right - 100;if (rect.contains(eventX, eventY)) {setText("");}}return super.onTouchEvent(event);}@Overrideprotected void finalize() throws Throwable {super.finalize();}}
接下来，我们只要在相关的Activity中处理即可。
MainActivity.java的代码如下：
package com.deepreality.userdefinededittextdemo;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.method.HideReturnsTransformationMethod;import android.text.method.PasswordTransformationMethod;import android.widget.CheckBox;import poundButton;import android.widget.EditText;public class MainActivity extends AppCompatActivity {private EditText edit_pawd;private CheckBox cbChange;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);edit_pawd = (EditText) findViewById(R.id.edit_pawd);cbChange = (CheckBox) findViewById(R.id.cbChange);edit_pawd.setHorizontallyScrolling(true); //设置EditText不换行cbChange.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if (isChecked) {//显示密码edit_pawd.setTransformationMethod(HideReturnsTransformationMethod.getInstance());} else {//不显示密码edit_pawd.setTransformationMethod(PasswordTransformationMethod.getInstance());}}});}}
