SP存储和读取

Posted 2020-08-13

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尚硅谷demo

package com.atguigu.l04_datastorage;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

/**
* 测试sp存储的界面
*/
public class SpActivity extends Activity {

private EditText et_sp_key;
private EditText et_sp_value;

private SharedPreferences sp;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sp);

et_sp_key = (EditText) findViewById(R.id.et_sp_key);
et_sp_value = (EditText) findViewById(R.id.et_sp_value);

//1. 得到sp对象
sp = getSharedPreferences("atguigu", Context.MODE_PRIVATE);
}

public void save(View v) {
//2. 得到editor对象
Editor edit = sp.edit();
//3. 得到输入的key/value
String key = et_sp_key.getText().toString();
String value = et_sp_value.getText().toString();
//4. 使用editor保存key-value
edit.putString(key, value).commit();
//5. 提示
Toast.makeText(this, "保存完成!", 0).show();
}

public void read(View v) {
//1. 得到输入的key
String key = et_sp_key.getText().toString();
//2. 根据key读取对应的value
String value = sp.getString(key, null);
//3. 显示
if(value==null) {
Toast.makeText(this, "没有找到对应的value", 0).show();
} else {
et_sp_value.setText(value);
}
}
}

第一行代码demo

package com.example.hzq_study;

import android.R.integer;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 将数据存储到SharedPreferences中
* @author 侯志强
*
*/
public class SPActivity extends Activity {

private Button savedata;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sp);

savedata = (Button) findViewById(R.id.save_data);
savedata.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();
editor.putString("name", "Tom");
editor.putInt("age", 28);
editor.putBoolean("married", false);
editor.commit();
}
});
}
}package com.example.hzq_study;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 将数据存储到SharedPreferences中
* @author 侯志强
*
*/
public class SPActivity extends Activity {

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 将数据存储到SharedPreferences中和从SharedPreferences中读取数据
* @author 侯志强
*
*/
public class HZQSPActivity extends Activity {

private Button savedata;
private Button restoredata;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sp);

savedata = (Button) findViewById(R.id.save_data);
restoredata = (Button) findViewById(R.id.restore_data);
savedata.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();
editor.putString("name", "Tom");
editor.putInt("age", 28);
editor.putBoolean("married", false);
editor.commit();
}
});

restoredata.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
SharedPreferences pref = getSharedPreferences("data", MODE_PRIVATE);
String name = pref.getString("name", "");
int age = pref.getInt("age", 0);
boolean married = pref.getBoolean("married", false);

}
});
}
}

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