搜索框edittext

来源：互联网发布：自学优化网络工程师编辑：程序博客网时间：2024/06/06 04:08

package com.example.deleteletter;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.support.v4.app.NavUtils;import android.text.Editable;import android.text.TextWatcher;public class MainActivity extends Activity {private ImageView ivDeleteText;private EditText etSearch;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ivDeleteText = (ImageView) findViewById(R.id.ivDeleteText);        etSearch = (EditText) findViewById(R.id.etSearch);                ivDeleteText.setOnClickListener(new OnClickListener() {public void onClick(View v) {etSearch.setText("");}});                etSearch.addTextChangedListener(new TextWatcher() {public void onTextChanged(CharSequence s, int start, int before, int count) {// TODO Auto-generated method stub}public void beforeTextChanged(CharSequence s, int start, int count,int after) {// TODO Auto-generated method stub}public void afterTextChanged(Editable s) {if (s.length() == 0) {ivDeleteText.setVisibility(View.GONE);} else {ivDeleteText.setVisibility(View.VISIBLE);}}});    }}

布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:paddingBottom="50dp"    android:layout_width="fill_parent"    android:layout_height="fill_parent">        <RelativeLayout android:id="@+id/top"    android:layout_width="fill_parent"    android:layout_alignParentTop="true"    android:paddingLeft="10dp"    android:paddingRight="10dp"    android:background="@drawable/top_background"    android:layout_height="wrap_content">            <Button android:id="@+id/btnSearch"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:gravity="center"        android:layout_centerVertical="true"        android:layout_alignParentRight="true"        android:textSize="12sp"        android:textStyle="bold"        android:background="@drawable/search_btn_background"        android:text="搜索"/>                <RelativeLayout android:id="@+id/rlSearchFrameDelete"            android:layout_width="fill_parent"            android:layout_height="wrap_content"        android:layout_centerVertical="true"android:gravity="center_vertical"            android:layout_toLeftOf="@id/btnSearch">                <EditText android:id="@+id/etSearch"        android:layout_width="fill_parent"        android:layout_height="wrap_content"android:singleLine="true"        android:background="@drawable/search_frame"        android:layout_marginRight="10dp"        android:paddingLeft="32dp"        android:textSize="12sp"        android:hint="请输入文字..."/>        <ImageView android:id="@+id/ivDeleteText"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:src="@drawable/delete"        android:layout_centerInParent="true"        android:paddingRight="20dp"        android:visibility="gone"/>                    </RelativeLayout>                </RelativeLayout>    </RelativeLayout>

自定义

package com.bw.myview;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.widget.EditText;import com.example.administrator.okhttp.R;public class ClearEditText extends EditText implements OnFocusChangeListener, TextWatcher {    /**     * 删除按钮的引用     */    private Drawable mClearDrawable;    /**     * 控件是否有焦点     */    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.mipmap.delete);        }        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);    }    /**     * 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，竖直方向就没有考虑     */    @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);    }    /**     * 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) {        this.hasFoucs = 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) {        if (hasFoucs) {            setClearIconVisible(s.length() > 0);        }    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    @Override    public void afterTextChanged(Editable s) {    }}

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