xml文件

<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:padding="5dp"><EditTextandroid:id="@+id/qqnum"android:layout_width="fill_parent"android:layout_height="wrap_content"android:hint="請輸入QQ"android:inputType="number"android:textSize="20dp"/><EditText?android:id="@+id/pass"android:layout_width="fill_parent"android:layout_height="wrap_content"android:hint="請輸入密碼"android:inputType="textPassword"android:textSize="20dp"/><CheckBox?android:id="@+id/rem"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="記住密碼"/><Button?android:id="@+id/Login"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="登錄"/></LinearLayout>

Utils

package?com.example.android22filelogin;import?java.io.BufferedReader; import?java.io.FileInputStream; import?java.io.FileNotFoundException; import?java.io.FileOutputStream; import?java.io.InputStreamReader; import?java.util.HashMap; import?java.util.Map;import?android.text.TextUtils;public?class?Utils?{public?static?boolean?saveUserInfo(String?username,String?pwd){String?data=username+"##"+pwd;String?path="/data/data/com.example.android22filelogin/data.txt";try?{FileOutputStream?out=new?FileOutputStream(path);out.write(data.getBytes());out.flush();out.close();return?true;}?catch?(Exception?e)?{e.printStackTrace();}return?false;}public?static?Map<String,String>?getUserInfo(){String?path="/data/data/com.example.android22filelogin/data.txt";try?{BufferedReader?reader=new?BufferedReader(new?InputStreamReader(new?FileInputStream(path)));String?data=reader.readLine();if(!TextUtils.isEmpty(data)){String?[]?datas=data.split("##");Map<String,?String>?userinfo=new?HashMap<String,?String>();userinfo.put("number",?datas[0]);userinfo.put("pwd",?datas[1]);return?userinfo;}}?catch?(Exception?e)?{e.printStackTrace();}return?null;}}

activity

public?class?MainActivity?extends?Activity?implements?OnClickListener?{private?EditText?qqnum,pwd;private?CheckBox?rem;private?Button?but;@Overrideprotected?void?onCreate(Bundle?savedInstanceState)?{super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);qqnum=(EditText)findViewById(R.id.qqnum);pwd=(EditText)findViewById(R.id.pass);rem=(CheckBox)findViewById(R.id.rem);but=(Button)findViewById(R.id.Login);but.setOnClickListener(this);//回顯數據Map<String,?String>?userinfo=Utils.getUserInfo();if(userinfo!=null){qqnum.setText(userinfo.get("number"));pwd.setText(userinfo.get("pwd"));}}@Overridepublic?void?onClick(View?v)?{//記住號碼和密碼String?num=qqnum.getText().toString();String?password=pwd.getText().toString();if(TextUtils.isEmpty(num)||TextUtils.isEmpty(password)){Toast.makeText(this,?"用戶名或密碼不能為空",?Toast.LENGTH_LONG).show();return;}//判斷是否記住密碼if(rem.isChecked()){boolean?isSuccess=Utils.saveUserInfo(num,?password);Toast.makeText(this,?isSuccess+"",?Toast.LENGTH_LONG).show();}//登錄成功}}

轉載于:https://blog.51cto.com/8023java/1664699

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