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();     }    }   });  }   } 

<TableLayout 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:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  android:stretchColumns="1"  tools:context=".MainActivity">   <TableRow>   <TextView    android:textSize="20sp"    android:text="账号:"    android:textColor="#000"    android:layout_height="wrap_content"/>   <EditText    android:id="@+id/account"    android:hint="请输入你的账号"    />  </TableRow>   <TableRow>   <TextView    android:textSize="20sp"    android:text="密码:"    android:textColor="#000"    android:layout_height="wrap_content"/>   <EditText    android:id="@+id/password"    android:hint="请输入你的密码"    android:password="true"    />  </TableRow>   <TableRow>   <CheckBox    android:id="@+id/remember_password"    android:layout_height="wrap_content"    android:layout_gravity="center"/>   <TextView    android:textSize="20sp"    android:text="记住密码"    android:layout_height="wrap_content"/>   </TableRow>   <TableRow>   <Button    android:id="@+id/button"    android:layout_span="2"    android:text="确定"    android:textSize="25sp"/>  </TableRow>  </TableLayout> 

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);  }   } 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  android:gravity="center_vertical">   <TextView   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="登陆成功!"   android:textSize="30sp"   android:layout_gravity="center_horizontal"   /> </LinearLayout>