android练习一之保存用户名

//activity_main.xml

//MainActivity.java

package com.vincentlin.saveusername;import android.app.Activity;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.CheckBox;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    private EditText etName,etPwd;    private CheckBox isCheck;    private Button login;    private SharedPreferences sp;    private Editor editor;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //将布局xml文件引入到activity当中        setContentView(R.layout.activity_main);                init();                String loginName = sp.getString("UserName", "");        String loginPwd = sp.getString("UserPwd", "");        if (loginName != null && loginPwd != null) {            isCheck.setChecked(true);            etName.setText(loginName);            etPwd.setText(loginPwd);        }    }    private void init() {        etName = (EditText) findViewById(R.id.etName);        etPwd = (EditText) findViewById(R.id.etPwd);        isCheck = (CheckBox) findViewById(R.id.isCheck);        login = (Button) findViewById(R.id.login);                sp = getSharedPreferences("UsersInfo", MODE_PRIVATE);        editor = sp.edit();        login.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View v) {                String name = etName.getText().toString().trim();                String pwd = etPwd.getText().toString().trim();                if (name.equals("admin") && pwd.equals("123")) {                    if (isCheck.isChecked()) {                        editor.putString("UserName", name);                        editor.putString("UserPwd", pwd);                        editor.commit();                        Toast.makeText(MainActivity.this, "ok", 0).show();                }else {                    editor.remove(name);                    editor.remove(pwd);                    editor.commit();                }             }            }                });    }     }

转载于:https://blog.51cto.com/xiaoshitou/1603621

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