带删除的EditText

来源：互联网发布：部落训练营升级数据编辑：程序博客网时间：2024/04/28 05:20

在安卓开发中EditText是比较常用的控件之一，那我们平常看到EditText填写了内容之后右边会出现一个删除的按钮，这样可以方便用户对其中文本清空操作，是非常人性化的，我们可以重写EditText来达到这样的效果。代码很简单，需要的盆友直接考皮就可以用，注意里面引用到一个删除按钮的图片资源。

package com.android.app;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.view.View;import com.android.app.R;public class EditText extends android.widget.EditText implements View.OnFocusChangeListener {    private Drawable mDeleteIcon;    private Context mContext;    public EditText(Context context) {        super(context);        mContext = context;        init();    }    public EditText(Context context, AttributeSet attrs) {        super(context, attrs);        mContext = context;        init();    }    public EditText(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        mContext = context;        init();    }    private void init() {        this.setOnFocusChangeListener(this);        mDeleteIcon = mContext.getResources().getDrawable(R.drawable.ic_input_close);        if (this.length() > 0) {            setCompoundDrawablesWithIntrinsicBounds(null, null, mDeleteIcon, null);        }        this.addTextChangedListener(new TextWatcher() {            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void afterTextChanged(Editable s) {                setDrawable();            }        });    }    // 设置删除图片    private void setDrawable() {        if (this.length() > 0)            setCompoundDrawablesWithIntrinsicBounds(null, null, mDeleteIcon, null);        else            setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);    }    @Override    public void onFocusChange(View view, boolean b) {        if (!b)            setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);        else            setDrawable();    }    // 处理删除事件    @Override    public boolean onTouchEvent(MotionEvent event) {        if (mDeleteIcon != 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 - 50;            if (rect.contains(eventX, eventY))                setText("");        }        return super.onTouchEvent(event);    }    @Override    protected void finalize() throws Throwable {        super.finalize();    }}

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