提取一个带计数框的EditText

这是效果图：

话不多数先上布局，我用的是线性布局：

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="@dimen/padding"

android:background="@drawable/gray_corner_edit_input_bg"

android:orientation="vertical"

android:padding="@dimen/half_padding">

android:id="@+id/count_edit"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="@null"

android:gravity="top|left"

android:inputType="textMultiLine"

android:minLines="3"

android:paddingBottom='@dimen/half_padding'

android:textColor="@color/black"

android:textColorHint="@color/text_color"

android:textSize="@dimen/small_text_size"/>

android:id="@+id/letter_count"

style="@style/MDWrapContentGrayTextStyle"

android:layout_width="wrap_content"

android:layout_gravity="right"

android:text="0/150"/>

</LinearLayout>

接下来就是要通过代码还控制了：

//

public class EditTextCount extends RelativeLayout {

private EditText etContent;//文本框

privateTextView tvNum;//字数显示TextView

private int MaxNum=150;//最大字符

//空参构造和有参构造

public EditTextCount(Context context) {

this(context, null);

}

public EditTextCount(Context context,AttributeSet attrs) {

super(context,attrs);

LayoutInflater.from(context).inflate(R.layout.view_count_layout, this, true);

etContent= (EditText) findViewById(R.id.count_edit);

tvNum= (TextView) findViewById(R.id.letter_count);

intlength =etContent.getText().toString().length();

tvNum.setText(length +"/"+MaxNum);

//设置最大长度

etContent.setFilters(newInputFilter[]{newInputFilter.LengthFilter(MaxNum)});

//监听输入

etContent.addTextChangedListener(mTextWatcher);

}

//设置最大字数

public voidsetLength(intnum){

MaxNum= num;

etContent.setFilters(newInputFilter[]{newInputFilter.LengthFilter(MaxNum)});

intlength =etContent.getText().toString().length();

tvNum.setText(length +"/"+MaxNum);

}

//设置框内的hint内容

public void setEtHint(intstr){

etContent.setHint(str);

}

//设置内容

public void setEtText(String str){

etContent.setText(str);

}

// 获取输入内容

public String getText(){

return etContent.getText().toString();

}

//主要还是通过给EditText 设置 TextWatcher 来监听

private TextWatcher mTextWatcher=new TextWatcher() {

public voidafterTextChanged(Editable s) {

intlength =etContent.getText().toString().length();

tvNum.setText(length +"/"+MaxNum);

}

public void beforeTextChanged(CharSequence s, intstart, intcount,intafter) {}

public void onTextChanged(CharSequence s, intstart, intbefore,intcount) {}

};