Android中SharedPreference使用实例讲解

import android.app.Activity; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.preference.PreferenceManager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.Window; 
import android.widget.Button; 
import android.widget.CheckBox; 
import android.widget.EditText; 
import android.widget.Toast; 
 
public class MainActivity extends Activity { 
 
 //使用SharedPreferences进行读取 
 private SharedPreferences pref; 
 //使用SharedPreferences.Editor进行存储 
 private SharedPreferences.Editor editor; 
 
 private Button button; 
 private CheckBox checkbox; 
 private EditText accountEdit; 
 private EditText passwordEdit; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  //取消标题 
  requestWindowFeature(Window.FEATURE_NO_TITLE); 
  setContentView(R.layout.activity_main); 
 
  //制定SharedPreference的文件名为data 
  pref= getSharedPreferences("data",MODE_PRIVATE); 
  editor=pref.edit(); 
  accountEdit=(EditText)findViewById(R.id.account); 
  passwordEdit=(EditText)findViewById(R.id.password); 
  checkbox=(CheckBox)findViewById(R.id.remember_password); 
  button=(Button)findViewById(R.id.button); 
 
  //查看app中是否已经存储过账号密码，有的话就直接显示出来 
  boolean isRemember=pref.getBoolean("remember_password",false); 
  if(isRemember){ 
   String account=pref.getString("account",""); 
   String password=pref.getString("password",""); 
   accountEdit.setText(account); 
   passwordEdit.setText(password); 
   checkbox.setChecked(true); 
  } 
 
 
  button.setOnClickListener(new View.OnClickListener() { 
   @Override 
   public void onClick(View view) { 
    String account=accountEdit.getText().toString(); 
    String password=passwordEdit.getText().toString(); 
    //此处设置的账号为“admin”，密码为“123” 
    if(account.equals("admin")&&password.equals("123")){ 
     //如果记住密码被选中，那么就将账号密码存储起来 
     //如果没有被选中，那么将存储的账号密码清空 
     if(checkbox.isChecked()){ 
      editor.putBoolean("remember_password",true); 
      editor.putString("account",account); 
      editor.putString("password",password); 
     }else{ 
      editor.clear(); 
     } 
     //最后千万不要忘记使用commit将添加的数据提交 
     editor.commit(); 
 
     //简单的跳转界面 
     Intent intent=new Intent(MainActivity.this,NextActivity.class); 
     startActivity(intent); 
     finish(); 
    }else{ 
     //如果账号密码错误，就跳出toast提示,并且清空存储的账号密码 
     Toast.makeText(MainActivity.this,"账号或密码错误！",Toast.LENGTH_LONG).show(); 
 
     editor.clear(); 
     editor.commit(); 
    } 
   } 
  }); 
 } 
 
 
} 

import android.app.Activity; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.Window; 
 
public class NextActivity extends Activity { 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  requestWindowFeature(Window.FEATURE_NO_TITLE); 
  setContentView(R.layout.activity_next); 
 } 
 
 
} 

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