Android EditText 清空按钮 小经验

：

1、准备图片如下

   2、xml 布局

 <?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <LinearLayout 

android:orientation="horizontal" 

android:gravity="center_vertical"

android:layout_width="fill_parent" 

android:layout_height="wrap_content"

android:background="@drawable/input_search" 

android:layout_marginLeft="5dip" 

android:layout_marginRight="5dip"

android:layout_marginTop="5dip" 

android:layout_marginBottom="5dip">

<ImageView 

android:layout_width="22dip"

                android:layout_height="22dip" 

android:src="@drawable/icon_magnifier" 

android:paddingRight="5dip"

                android:layout_marginLeft="5dip"/>

            <EditText

                android:id="@+id/searchEditText"

                android:layout_width="fill_parent"

                android:layout_height="wrap_content"

                android:layout_weight="1"

                android:hint="搜索"

                android:imeOptions="actionDone"

                android:singleLine="true"

                android:background="@null"

                android:textSize="16sp"

                />

            < Button

                android:id="@+id/button_clear"

                android:layout_width="20dip"

                android:layout_height="20dip"

                android:background="@drawable/icon_clear"

                android:visibility="invisible"

                android:layout_marginRight="8dip" />

</LinearLayout>

</LinearLayout>

3、代码

public class EdittextclearActivity extends Activity {

   

EditText searchEditText;

Button clearButton;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        

        searchEditText = (EditText) findViewById(R.id.searchEditText);

        clearButton = (Button) findViewById(R.id.button_clear);

        

        searchEditText.addTextChangedListener(mTextWatcher);

        clearButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

searchEditText.setText("");

}

});

}

    

    

TextWatcher mTextWatcher  = new TextWatcher() {

@Override

public void onTextChanged(CharSequence s, int start, int before, int count) {

// TODO Auto-generated method stub

}

@Override

public void beforeTextChanged(CharSequence s, int start, int count, int after) {

// TODO Auto-generated method stub

}

@Override

public void afterTextChanged(Editable s) {

if(searchEditText.getText().toString()!=null&&!searchEditText.getText().toString().equals("")){

clearButton.setVisibility(View.VISIBLE);

}else{

clearButton.setVisibility(View.INVISIBLE);

}

}

};

}