android EditText实例删除按钮与内容监听

1.EditText 文本内容监听
需要使用TextWatcher 
布局文件

Java

mTextWatchEditText.addTextChangedListener(new TextWatcher() {// 记录写入之前的文本private CharSequence temp;private int editStart;private int editEnd;@Overridepublic void beforeTextChanged(CharSequence s, int start, int count,int after) {temp = s;}@Overridepublic void onTextChanged(CharSequence s, int start, int before,int count) {text.setText(s);// 将输入的内容实时显示}@Overridepublic void afterTextChanged(Editable s) {editStart = mTextWatchEditText.getSelectionStart();editEnd = mTextWatchEditText.getSelectionEnd();Log.d("Tag", "" + editStart);Log.d("Tag", "" + editEnd);text.setText("您输入了" + temp.length() + "个字符");if (temp.length() > 10) {Toast.makeText(MainActivity.this, "你输入的字数已经超过了限制！",Toast.LENGTH_SHORT).show();s.delete(editStart - 1, editEnd);int tempSelection = editStart;mTextWatchEditText.setText(s);mTextWatchEditText.setSelection(tempSelection);}}});

2.ClearEditText

一个继承与EditText 加上删除功能的输入框

java 代码

public class ClearEditText extends EditText implements          OnFocusChangeListener, TextWatcher { /** * 删除按钮的引用 */    private Drawable mClearDrawable;      public ClearEditText(Context context) {     this(context, null);     }      public ClearEditText(Context context, AttributeSet attrs) {     //这里构造方法也很重要，不加这个很多属性不能再XML里面定义    this(context, attrs, android.R.attr.editTextStyle);     }         public ClearEditText(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }            private void init() {     //获取EditText的DrawableRight,假如没有设置我们就使用默认的图片    mClearDrawable = getCompoundDrawables()[2];         if (mClearDrawable == null) {         mClearDrawable = getResources()                     .getDrawable(R.drawable.emotionstore_progresscancelbtn);         }         mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());         setClearIconVisible(false);         setOnFocusChangeListener(this);         addTextChangedListener(this);     }       /**     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件     * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑     */    @Override     public boolean onTouchEvent(MotionEvent event) {         if (getCompoundDrawables()[2] != null) {             if (event.getAction() == MotionEvent.ACTION_UP) {             boolean touchable = event.getX() > (getWidth()                         - getPaddingRight() - mClearDrawable.getIntrinsicWidth())                         && (event.getX() < ((getWidth() - getPaddingRight())));                if (touchable) {                     this.setText("");                 }             }         }          return super.onTouchEvent(event);     }      /**     * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏     */    @Override     public void onFocusChange(View v, boolean hasFocus) {         if (hasFocus) {             setClearIconVisible(getText().length() > 0);         } else {             setClearIconVisible(false);         }     }       /**     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去     * @param visible     */    protected void setClearIconVisible(boolean visible) {         Drawable right = visible ? mClearDrawable : null;         setCompoundDrawables(getCompoundDrawables()[0],                 getCompoundDrawables()[1], right, getCompoundDrawables()[3]);     }              /**     * 当输入框里面内容发生变化的时候回调的方法     */    @Override     public void onTextChanged(CharSequence s, int start, int count,             int after) {         setClearIconVisible(s.length() > 0);     }      @Override     public void beforeTextChanged(CharSequence s, int start, int count,             int after) {              }      @Override     public void afterTextChanged(Editable s) {              }            /**     * 设置晃动动画     */    public void setShakeAnimation(){    this.setAnimation(shakeAnimation(5));    }            /**     * 晃动动画     * @param counts 1秒钟晃动多少下     * @return     */    public static Animation shakeAnimation(int counts){    Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);    translateAnimation.setInterpolator(new CycleInterpolator(counts));    translateAnimation.setDuration(1000);    return translateAnimation;    }  }

效果三

// 原生的EditText 带删除键

mOEdit = (EditText) findViewById(R.id.nativeEdit);mClear = (ImageButton) findViewById(R.id.clear);mOEdit.addTextChangedListener(new TextWatcher() {// 记录写入之前的文本private CharSequence temp;private int editStart;private int editEnd;@Overridepublic void onTextChanged(CharSequence s, int start, int before,int count) {temp = s;String str = mOEdit.getText().toString().trim();int length = str.length();if (length > 0) {mClear.setVisibility(View.VISIBLE);// 让删除符号晚一点自动消失mClear.postDelayed(new Runnable() {@Overridepublic void run() {mClear.setVisibility(View.INVISIBLE);}}, 5000);} else {mClear.setVisibility(View.INVISIBLE);}}@Overridepublic void beforeTextChanged(CharSequence s, int start, int count,int after) {}public void afterTextChanged(Editable s) {editStart = mTextWatchEditText.getSelectionStart();editEnd = mTextWatchEditText.getSelectionEnd();Log.d("Tag", "" + editStart);Log.d("Tag", "" + editEnd);if (temp.length() > 10) {Toast.makeText(MainActivity.this, "你输入的字数已经超过了限制！",Toast.LENGTH_SHORT).show();s.delete(editStart - 1, editEnd);int tempSelection = editStart;mOEdit.setText(s);mOEdit.setSelection(tempSelection);}}});mClear.setOnClickListener(new OnClickListener() {public void onClick(View v) {mOEdit.setText("");}});

效果图

android EditText实例删除按钮与内容监听_第1张图片

源码

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