Android 自定义EditText输入框带清空按钮

package com.example.myedittexttest;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;import android.widget.EditText;public class MyEditText extends EditText {	private final String TAG = "MyEditText";	private Drawable dRight;	private Rect rBounds;	public MyEditText(Context paramContext) {		super(paramContext);		initEditText();	}	public MyEditText(Context paramContext, AttributeSet paramAttributeSet) {		super(paramContext, paramAttributeSet);		initEditText();	}	public MyEditText(Context paramContext, AttributeSet paramAttributeSet, int paramInt) {		super(paramContext, paramAttributeSet, paramInt);		initEditText();	}	// 初始化edittext 控件	private void initEditText() {		setEditTextDrawable();		addTextChangedListener(new TextWatcher() { // 对文本内容改变进行监听			@Override			public void afterTextChanged(Editable paramEditable) {			}			@Override			public void beforeTextChanged(CharSequence paramCharSequence, int paramInt1, int paramInt2, int paramInt3) {			}			@Override			public void onTextChanged(CharSequence paramCharSequence, int paramInt1, int paramInt2, int paramInt3) {				MyEditText.this.setEditTextDrawable();			}		});	}	// 控制图片的显示	public void setEditTextDrawable() {		if (getText().toString().length() == 0) {			setCompoundDrawables(null, null, null, null);		} else {			setCompoundDrawables(null, null, this.dRight, null);		}	}	@Override	protected void onDetachedFromWindow() {		super.onDetachedFromWindow();		this.dRight = null;		this.rBounds = null;	}	/**	 * 添加触摸事件 点击之后 出现 清空editText的效果	 */	@Override	public boolean onTouchEvent(MotionEvent paramMotionEvent) {		if ((this.dRight != null) && (paramMotionEvent.getAction() == 1)) {			this.rBounds = this.dRight.getBounds();			int i = (int) paramMotionEvent.getRawX();// 距离屏幕的距离			// int i = (int) paramMotionEvent.getX();//距离边框的距离			if (i > getRight() - 3 * this.rBounds.width()) {				setText("");				paramMotionEvent.setAction(MotionEvent.ACTION_CANCEL);			}		}		return super.onTouchEvent(paramMotionEvent);	}	/**	 * 显示右侧X图片的	 * 	 * 左上右下	 */	@Override	public void setCompoundDrawables(Drawable paramDrawable1, Drawable paramDrawable2, Drawable paramDrawable3, Drawable paramDrawable4) {		if (paramDrawable3 != null)			this.dRight = paramDrawable3;		super.setCompoundDrawables(paramDrawable1, paramDrawable2, paramDrawable3, paramDrawable4);	}}

<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"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  tools:context=".MainActivity" >  <com.example.myedittexttest.MyEditText    android:id="@+id/edit_text"    android:layout_width="fill_parent"    android:layout_height="50dp"    android:layout_marginTop="50dp"    android:background="#88aaff"    android:drawableRight="@drawable/edit_clear"    android:textCursorDrawable="@null" />  <Button    android:id="@+id/button1"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_below="@+id/edit_text"    android:layout_marginTop="84dp"    android:layout_toRightOf="@+id/textView1"    android:text="Button" /></RelativeLayout>

android:drawableRight="@drawable/edit_clear"

android:textCursorDrawable="@null"

android:cursorVisible="true"//显示android:cursorVisible="false"//隐藏