封装的自定义dialog,文本编辑，EditText,按需更改

自定义的弹窗，带文本编辑，按需更改
下面是封装好的抽象类

package b2a.main.utils;

import android.content.Context;
import android.support.v7.app.AlertDialog;
import android.text.Editable;
import android.text.Selection;
import android.text.TextWatcher;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

import b2a.main.R;

/**
 * Created by pc-004 on 2015/10/19.
 */
public abstract class DialogMessage {
    public void dialogShowDiy(Context context, LinearLayout viewGroup, String leftTitle, String rightTitle,
                              String leftBtn, String rightBtn, String eText) {

        final AlertDialog dialog = new AlertDialog.Builder(context).create();
        dialog.setView(viewGroup);
        TextView txtvTitleLeft = (TextView) viewGroup.findViewById(R.id.txtv_tile_left);
        final TextView txtvTitleRight = (TextView) viewGroup.findViewById(R.id.txtv_title_right);
        TextView txtvBtnLeft = (TextView) viewGroup.findViewById(R.id.txtv_left_btn);
        TextView txtvBtnRight = (TextView) viewGroup.findViewById(R.id.txtv_right_btn);
        final EditText editText = (EditText) viewGroup.findViewById(R.id.etxt_area);
        editText.setText(eText);
        txtvTitleLeft.setText(leftTitle);
        txtvTitleRight.setText(rightTitle);
        txtvBtnLeft.setText(leftBtn);
        txtvBtnRight.setText(rightBtn);
        txtvBtnLeft.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                leftBtnClick(editText);
                dialog.cancel();
            }
        });


        txtvBtnRight.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                rightBtnClick(editText);
                dialog.cancel();
            }
        });

        editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                txtvTitleRight.setText(editText.length() + "/" + "300字");
                Editable editable = editText.getText();
                int len = editable.length();
                if (len > 300) {
                    int selEndIndex = Selection.getSelectionEnd(editable);
                    String str = editable.toString();
                    //截取新字符串
                    String newStr = str.substring(0, 300);
                    editText.setText(newStr);
                    editable = editText.getText();

                    //新字符串的长度
                    int newLen = editable.length();
                    //旧光标位置超过字符串长度
                    if (selEndIndex > newLen) {
                        selEndIndex = editable.length();
                    }
                    //设置新光标所在的位置
                    Selection.setSelection(editable, selEndIndex);

                }
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

        dialog.show();
    }

    /**
     * 自定义dialog
     */
    public abstract void leftBtnClick(EditText editText);

    public abstract void rightBtnClick(EditText editText);
}


在activity或者是fragment中使用时，要实现这个抽象类
DialogMessage dialogMessage = new DialogMessage() {
    @Override
    public void leftBtnClick(EditText editText) {
    }

    @Override
    public void rightBtnClick(EditText editText) {

    }
};

dialogMessage.dialogShowDiy(context, 
(LinearLayout) View.inflate(context, R.layout.dialog_input_area, null),
        input, "",
        context.getResources().getString(R.string.cancle),
 context.getResources().getString(R.string.save), etxt);