上問題程式碼

public class SettingActivity extends Activity {

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_setting);
        initRemoteLockScreen();
    }

public void initRemoteLockScreen(){
        SettingClickView rls = (SettingClickView) findViewById(R.id.siv_remoteLockScreen);
        rls.setTitle("遠端鎖屏密碼設定"
 
);
        rls.setDesc("點選進行設定密碼");

        rls.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                startremotelockdialog();
            }
        });

    }

    public void startremotelockdialog(){

        showPasswordSetDailog(dialogTitle,new
 
 AlertDialogEngineInterface() {
            @Override
            public void saveSp(String value) {
                if (value == null){
                    return;
                }
                mPref.edit()
                        .putString("lockScreenPass",
                                MD5Utils.encode(value)).commit();
            }

        });
    }

    public
 
 void showPasswordSetDailog(String title, final AlertDialogEngineInterface dialogInterface) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        final AlertDialog dialog = builder.create();

        View view = View.inflate(this, R.layout.dailog_set_password, null);

    dialog.setView(view, 0, 0, 0, 0);
        TextView tvTitle = (TextView) findViewById(R.id.dialog_tv_title);
        tvTitle.setText(title);
        Log.e("xxx",title);//**title值不為空**
        final EditText etPassword = (EditText) view
                .findViewById(R.id.et_password);
        final EditText etPasswordConfirm = (EditText) view
                .findViewById(R.id.et_password_confirm);

        Button btnOK = (Button) view.findViewById(R.id.btn_ok);
        Button btnCancel = (Button) view.findViewById(R.id.btn_cancel);

        btnOK.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String password = etPassword.getText().toString();
                String passwordConfirm = etPasswordConfirm.getText().toString();

                if (!TextUtils.isEmpty(password) && !passwordConfirm.isEmpty()) {
                    if (password.equals(passwordConfirm)) {
                        dialogInterface.saveSp(password);

                        dialog.dismiss();

                    } 
            }
        });

        btnCancel.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                dialog.dismiss();// 隱藏dialog
            }
        });

        dialog.show();
}

private interface AlertDialogEngineInterface{

        void saveSp(String value);

    }
}

結論：
內部類呼叫外部類方法時傳參是可以傳參的，不管外部類方法是private，還是public；而且內部類裡可以修改外部類的成員變數。
如果外部類方法無法得到內部類區域性變數的值，那應該是哪裡寫錯了。