如何使用共享首選項來保存名稱

-2

我想創建一個應用程序，以減少學校的紙張使用量，所以我需要老師在設置活動中寫下他的名字，然後將他的名字顯示在主要活動中這是我用的TextView活動以顯示名稱如何使用共享首選項來保存名稱

@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); 
}

，這是活動在哪裏輸入名字要保存：

@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); 

}

任何幫助將是巨大的

來源

2014-02-19 user3328669

看到這裏的http：/ /stackoverflow.com/a/12074219/940834 ..這個問題已被問了很多次。下次嘗試使用谷歌。 – Doomsknight

要保存到SharedPreferences，通過傳遞Context活動的創建SharedPreferences實例...如下...

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

從SharedPreferences檢索如下...

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

來源

2014-02-19 15:07:40

如何使用共享首選項來保存名稱

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