实现登陆页面记住密码功能

1实验运行效果图

<img src="https://img-blog.youkuaiyun.com/20150603225421887?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMzA4Mjk4Ng==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

  2实验要求   

   掌握 SharePreference的使用
   理解SharePreference背后的原理 

  3代码结构以及实验步骤

  加入复选框组件

  登陆按钮事件处理

  在onCreate方法加入是否记住密码的逻辑判断

 4部分代码如下

MainActivity.java 

welcome.java

MainActivity.java代码如下

package com.example.minitwitter;


import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends Activity {


private EditText name;
private EditText pass;
private CheckBox isRemenber;
private CheckBox isLoginSelf;
private Button longin;
private ProgressDialog mDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
name=(EditText) findViewById(R.id.etUsername);
pass=(EditText) findViewById(R.id.etPassword);
isRemenber=(CheckBox) findViewById(R.id.cbRememberPass);
isLoginSelf=(CheckBox) findViewById(R.id.autologin);
longin=(Button) findViewById(R.id.btnLogin);
final SharedPreferences sharedPreferences=getSharedPreferences("data",MODE_PRIVATE);
if(sharedPreferences!=null)
{
if(sharedPreferences.getBoolean("isrmb",false)==true)
{
name.setText(sharedPreferences.getString("name",null));
pass.setText(sharedPreferences.getString("pass",null));
isRemenber.setChecked(true);
}
if(sharedPreferences.getBoolean("islgs",false)==true)
{
isLoginSelf.setChecked(true);
ceratDialog();
new Thread()
{
public void run()
{
try{
Thread.sleep(3000);
if(mDialog.isShowing())
{
mDialog.dismiss();
}
Intent intent2=new Intent(MainActivity.this,welcome.class);
startActivity(intent2);
//finish();
}catch(Exception e)
{

}
}
}.start();
}
}
isRemenber.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(isRemenber.isClickable()==false)
{
isLoginSelf.setChecked(false);
}
}
});
isLoginSelf.setOnCheckedChangeListener(new OnCheckedChangeListener() {

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
isRemenber.setChecked(true);
}
});
longin.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(!name.getText().toString().equals("") && !pass.getText().toString().equals(""))
{
if(isLoginSelf.isChecked())
{
sharedPreferences.edit().putBoolean("isrmb",true).putBoolean("islgs",true).putString("name",name.getText().toString()).putString("pass",pass.getText().toString()).commit();
}
else
if(isRemenber.isChecked())
{
sharedPreferences.edit().putBoolean("isrmb",true).putBoolean("islgs",false).putString("name",name.getText().toString()).putString("pass",pass.getText().toString()).commit();
}
else
{
sharedPreferences.edit().putBoolean("isrmb",false).putBoolean("islgs",false).putString("name",name.getText().toString()).putString("pass",pass.getText().toString()).putString("pass",pass.getText().toString()).commit();
}
Intent intent=new Intent(MainActivity.this,welcome.class);
startActivity(intent);
finish();
}
else{
Toast.makeText(getApplicationContext(), "密码或账号不能为空！",Toast.LENGTH_LONG).show();
}

}
});
}




/** public void to2 (View view)
{
Intent intent=new Intent();
intent.setClass(this,welcome.class);
startActivity(intent);
}
**/
/** public void save (View view)
{
SharedPreferences sharedPreferences=getSharedPreferences("data",MODE_PRIVATE);
Editor editor=sharedPreferences.edit();
editor.putString("username","user");
editor.putString("password","password");
editor.commit();
}
**/
private void ceratDialog()
{
mDialog=new ProgressDialog(this);
mDialog.setTitle("验证中");
mDialog.setMessage("正在登陆请稍后");
mDialog.setIndeterminate(true);
mDialog.setCancelable(true);
mDialog.show();

}
}

  

welcome.java代码如下

package com.example.minitwitter;




import android.app.Activity;
import android.os.Bundle;
import android.view.Window;


public class welcome extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.welcome);
}
}

 

 activity_main.xml代码如下

/** Automatically generated file. DO NOT MODIFY */
package com.example.minitwittersimulate;


public final class BuildConfig {
    public final static boolean DEBUG = true;
}

 

welcome.xml代码如下

/** Automatically generated file. DO NOT MODIFY */
package com.example.minitwittersimulate;


public final class BuildConfig {
    public final static boolean DEBUG = true;
}