Android应用中怎么实现一个带清除功能的输入框

2023-05-31 03:03

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本篇文章给大家分享的是有关Android应用中怎么实现一个带清除功能的输入框，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。

一，自定义一个类，名为ClearEditText

package com.example.clearedittext;  import android.content.Context; import android.graphics.drawable.Drawable; import android.text.Editable; import android.text.TextWatcher; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.View.OnFocusChangeListener; import android.view.animation.Animation; import android.view.animation.CycleInterpolator; import android.view.animation.TranslateAnimation; import android.widget.EditText;  public class ClearEditText extends EditText implements      OnFocusChangeListener, TextWatcher {       private Drawable mClearDrawable;       private boolean hasFoucs;     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) {  //     throw new NullPointerException("You can add drawableRight attribute in XML");       mClearDrawable = getResources().getDrawable(R.drawable.delete_selector);      }           mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());      //默认设置隐藏图标     setClearIconVisible(false);      //设置焦点改变的监听     setOnFocusChangeListener(this);      //设置输入框里面内容发生改变的监听     addTextChangedListener(this);    }           @Override    public boolean onTouchEvent(MotionEvent event) {     if (event.getAction() == MotionEvent.ACTION_UP) {       if (getCompoundDrawables()[2] != null) {          boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())             && (event.getX() < ((getWidth() - getPaddingRight())));                  if (touchable) {           this.setText("");         }       }     }      return super.onTouchEvent(event);   }        @Override    public void onFocusChange(View v, boolean hasFocus) {      this.hasFoucs = hasFocus;     if (hasFocus) {        setClearIconVisible(getText().length() > 0);      } else {        setClearIconVisible(false);      }    }           protected void setClearIconVisible(boolean visible) {      Drawable right = visible &#63; mClearDrawable : null;      setCompoundDrawables(getCompoundDrawables()[0],          getCompoundDrawables()[1], right, getCompoundDrawables()[3]);    }              @Override    public void onTextChanged(CharSequence s, int start, int count,        int after) {          if(hasFoucs){           setClearIconVisible(s.length() > 0);         }   }      @Override    public void beforeTextChanged(CharSequence s, int start, int count,        int after) {          }      @Override    public void afterTextChanged(Editable s) {          }             public void setShakeAnimation(){     this.setAnimation(shakeAnimation(5));   }            public static Animation shakeAnimation(int counts){     Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);     translateAnimation.setInterpolator(new CycleInterpolator(counts));     translateAnimation.setDuration(1000);     return translateAnimation;   }     }

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