如何使用共享首选项来保存名称

-2

我想创建一个应用程序，以减少学校的纸张使用量，所以我需要老师在设置活动中写下他的名字，然后将他的名字显示在主要活动中这是我用的TextView活动以显示名称如何使用共享首选项来保存名称

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    String key = null; 
    setContentView(R.layout.activity_main); 
    SharedPreferences sp = getSharedPreferences(key, Activity.MODE_PRIVATE); 
    String name = sp.getString(key, ""); 
    TextView name2 = (TextView) findViewById(R.id.textView1); 
    name2.setText(name); 
} 
public void onResume(View view) { 
    String key = null; 
    SharedPreferences sp = getSharedPreferences(key, Activity.MODE_PRIVATE); 
    String name = sp.getString(key, ""); 
    TextView name2 = (TextView) findViewById(R.id.textView1); 
    name2.setText(name); 

} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 
public void save(View view){ 
    Intent intent = new Intent(this, MainActivity2.class); 
    startActivity(intent); 
}

，这是活动在哪里输入名字要保存：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main_activity2); 

} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main_activity2, menu); 
    return true; 
} 
public void save2 (View view) { 
    final String key = "placeKey"; 
    EditText save = (EditText) findViewById(R.id.editText1); 
    String save2 = save.getText().toString(); 
    SharedPreferences sp = getSharedPreferences(key, Activity.MODE_PRIVATE); 
    SharedPreferences.Editor edt = sp.edit(); 
    edt.putString(key, save2); 
    edt.commit(); 

    String name = sp.getString(key, ""); 
    TextView name2 = (TextView) findViewById(R.id.textView1); 
    name2.setText(name); 
} 
public void hrag (View view){ 
    final String key = "placeKey"; 

     SharedPreferences sharedpreferences; 
    SharedPreferences sp = getSharedPreferences(key, Activity.MODE_PRIVATE); 
    String name = sp.getString(key, ""); 
    TextView name2 = (TextView) findViewById(R.id.textView1); 
    name2.setText(name); 

}

任何帮助将是巨大的

来源

2014-02-19 user3328669

看到这里的http：/ /stackoverflow.com/a/12074219/940834 ..这个问题已被问了很多次。下次尝试使用谷歌。 – Doomsknight

要保存到SharedPreferences，通过传递Context活动的创建SharedPreferences实例...如下...

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); 
SharedPreferences.Editor prefsEditor = prefs.edit(); 
prefsEditor.putString("key", value); 
prefsEditor.commit();

从SharedPreferences检索如下...

prefsEditor.getString("key", "");

来源

2014-02-19 15:07:40

如何使用共享首选项来保存名称

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