归档—SharedPreferences（轻量级存储）

来源：互联网发布：好的手机壁纸软件编辑：程序博客网时间：2024/06/06 20:20

<p style="margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; font-family: Arial; font-size: 14px; line-height: 26px;">SharedPreferences(轻量级的存储)，通常我们可以用它来记录一些小的数据，例如我们可以记录用户的账号及密码，以便用户下次登录不需要重复输入。</p><p style="margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; font-family: Arial; font-size: 14px; line-height: 26px;">示例代码：</p>

import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity implements OnClickListener{private EditText pass;private EditText user;private SharedPreferences sp;private String strPass;private String strUser;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button but= (Button) findViewById(R.id.but);but.setOnClickListener(this);pass = (EditText) findViewById(R.id.edi_pass);user = (EditText) findViewById(R.id.edi_user);sp = this.getSharedPreferences("sp", Context.MODE_PRIVATE);String u = sp.getString("user","");String p = sp.getString("pass", null);if("".equals(u) || p != null){user.setText(u);pass.setText(p);}}@Overridepublic void onClick(View v) {strPass = pass.getText().toString().trim();strUser = user.getText().toString().trim();Toast.makeText(this, "账号："+strUser+" 密码："+strPass, Toast.LENGTH_SHORT).show();if ("123".equals(strUser) && "12345".equals(strPass)) {Toast.makeText(this, "输入正确", Toast.LENGTH_SHORT).show();Editor edi=sp.edit();boolean is=sp.getBoolean("isf", true);if (is) {edi.putBoolean("isf", false);}else{}edi.putString("pass", strPass);edi.putString("user", strUser);edi.commit();}else{Toast.makeText(this, "输入错误", Toast.LENGTH_SHORT).show();}}}

布局：

<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" >    <EditText        android:id="@+id/edi_user"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="账号" />    <EditText        android:id="@+id/edi_pass"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="密码" />    <Button        android:id="@+id/but"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="登录" /></LinearLayout>

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