使用共享首選項崩潰我的應用程序

我從來沒有與SP合作過，所以我可能做了一些非常錯誤的事情，但我給了它最好的一擊。我做了很多研究，這就是我想到的，但是當我運行我的應用程序時，它會立即崩潰。使用共享首選項崩潰我的應用程序

我有很多更多的複選框，但是這只是一個例子，以保持代碼的短：

final CheckBox cb1 = (CheckBox) findViewById(R.id.checkBox1); 
cb1.setChecked(getFromSP("cb1")); 
cb1.setOnCheckedChangeListener((OnCheckedChangeListener) this);

的代碼時，我設置爲「選中」的複選框：

cb1.setChecked(true); 
saveInSp("cb1",isChecked);

而其餘的SP代碼：

private boolean getFromSP(String key){ 
    SharedPreferences preferences = getApplicationContext() 
     .getSharedPreferences("GW2Legendary", android.content.Context.MODE_PRIVATE); 
    return preferences.getBoolean(key, false); 
} 
private void saveInSp(String key,boolean value){ 
    SharedPreferences preferences = getApplicationContext() 
     .getSharedPreferences("GW2Legendary", android.content.Context.MODE_PRIVATE); 
    SharedPreferences.Editor editor = preferences.edit(); 
    editor.putBoolean(key, value); 
    editor.commit(); 
}

正如我所說，我從來沒有使用共享偏好，所以我可能會做真的是錯的東西。我會很感激，如果有人會解釋這是如何工作，我做錯了什麼。正如你可以看到，我試圖讓我的應用程序記住哪些複選框我已籤

我還增加了整個Java代碼，如果它可以幫助：

public class Bifrost extends Activity { 

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

    final CheckBox cb1 = (CheckBox) findViewById(R.id.checkBox1); 
    cb1.setChecked(getFromSP("cb1")); 
    cb1.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb2 = (CheckBox) findViewById(R.id.checkBox2); 
    cb2.setChecked(getFromSP("cb2")); 
    cb2.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb3 = (CheckBox) findViewById(R.id.checkBox3); 
    cb3.setChecked(getFromSP("cb3")); 
    cb3.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb4 = (CheckBox) findViewById(R.id.checkBox4); 
    cb4.setChecked(getFromSP("cb4")); 
    cb4.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb5 = (CheckBox) findViewById(R.id.checkBox5); 
    cb5.setChecked(getFromSP("cb5")); 
    cb5.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb6 = (CheckBox) findViewById(R.id.checkBox6); 
    cb6.setChecked(getFromSP("cb6")); 
    cb6.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb7 = (CheckBox) findViewById(R.id.checkBox7); 
    cb7.setChecked(getFromSP("cb7")); 
    cb7.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb8 = (CheckBox) findViewById(R.id.checkBox8); 
    cb8.setChecked(getFromSP("cb8")); 
    cb8.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb9 = (CheckBox) findViewById(R.id.checkBox9); 
    cb9.setChecked(getFromSP("cb9")); 
    cb9.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb10 = (CheckBox) findViewById(R.id.checkBox10); 
    cb10.setChecked(getFromSP("cb10")); 
    cb10.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb11 = (CheckBox) findViewById(R.id.checkBox11); 
    cb11.setChecked(getFromSP("cb11")); 
    cb11.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb12 = (CheckBox) findViewById(R.id.checkBox12); 
    cb12.setChecked(getFromSP("cb12")); 
    cb12.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb13 = (CheckBox) findViewById(R.id.checkBox13); 
    cb13.setChecked(getFromSP("cb13")); 
    cb13.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb14 = (CheckBox) findViewById(R.id.checkBox14); 
    cb14.setChecked(getFromSP("cb14")); 
    cb14.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb15 = (CheckBox) findViewById(R.id.checkBox15); 
    cb15.setChecked(getFromSP("cb15")); 
    cb15.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb16 = (CheckBox) findViewById(R.id.checkBox16); 
    cb16.setChecked(getFromSP("cb16")); 
    cb16.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb17 = (CheckBox) findViewById(R.id.checkBox17); 
    cb17.setChecked(getFromSP("cb17")); 
    cb17.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb18 = (CheckBox) findViewById(R.id.checkBox18); 
    cb18.setChecked(getFromSP("cb18")); 
    cb18.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb19 = (CheckBox) findViewById(R.id.checkBox19); 
    cb19.setChecked(getFromSP("cb19")); 
    cb19.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb20 = (CheckBox) findViewById(R.id.checkBox20); 
    cb20.setChecked(getFromSP("cb20")); 
    cb20.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb21 = (CheckBox) findViewById(R.id.checkBox21); 
    cb21.setChecked(getFromSP("cb21")); 
    cb21.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb22 = (CheckBox) findViewById(R.id.checkBox22); 
    cb22.setChecked(getFromSP("cb22")); 
    cb22.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb23 = (CheckBox) findViewById(R.id.checkBox23); 
    cb23.setChecked(getFromSP("cb23")); 
    cb23.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb24 = (CheckBox) findViewById(R.id.checkBox24); 
    cb24.setChecked(getFromSP("cb24")); 
    cb24.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb25 = (CheckBox) findViewById(R.id.checkBox25); 
    cb25.setChecked(getFromSP("cb25")); 
    cb25.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb26 = (CheckBox) findViewById(R.id.checkBox26); 
    cb26.setChecked(getFromSP("cb26")); 
    cb26.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb27 = (CheckBox) findViewById(R.id.checkBox27); 
    cb27.setChecked(getFromSP("cb27")); 
    cb27.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb28 = (CheckBox) findViewById(R.id.checkBox28); 
    cb28.setChecked(getFromSP("cb28")); 
    cb28.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb29 = (CheckBox) findViewById(R.id.checkBox29); 
    cb29.setChecked(getFromSP("cb29")); 
    cb29.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb30 = (CheckBox) findViewById(R.id.checkBox30); 
    cb30.setChecked(getFromSP("cb30")); 
    cb30.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb31 = (CheckBox) findViewById(R.id.checkBox31); 
    cb31.setChecked(getFromSP("cb31")); 
    cb31.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb32 = (CheckBox) findViewById(R.id.checkBox32); 
    cb32.setChecked(getFromSP("cb32")); 
    cb32.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb33 = (CheckBox) findViewById(R.id.checkBox33); 
    cb33.setChecked(getFromSP("cb33")); 
    cb33.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb34 = (CheckBox) findViewById(R.id.checkBox34); 
    cb34.setChecked(getFromSP("cb34")); 
    cb34.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb35 = (CheckBox) findViewById(R.id.checkBox35); 
    cb35.setChecked(getFromSP("cb35")); 
    cb35.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb36 = (CheckBox) findViewById(R.id.checkBox36); 
    cb36.setChecked(getFromSP("cb36")); 
    cb36.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb37 = (CheckBox) findViewById(R.id.checkBox37); 
    cb37.setChecked(getFromSP("cb37")); 
    cb37.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb38 = (CheckBox) findViewById(R.id.checkBox38); 
    cb38.setChecked(getFromSP("cb38")); 
    cb38.setOnCheckedChangeListener((OnCheckedChangeListener) this); 
    final CheckBox cb39 = (CheckBox) findViewById(R.id.checkBox39); 
    cb39.setChecked(getFromSP("cb39")); 
    cb39.setOnCheckedChangeListener((OnCheckedChangeListener) this); 

    cb3.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb3.isChecked()) 
      { 
       cb4.setChecked(true); 
       cb5.setChecked(true); 
       cb6.setChecked(true); 
       cb7.setChecked(true); 
      } 

     } 
    }); 

    cb8.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb8.isChecked()) 
      { 
       cb9.setChecked(true); 
       saveInSp("cb1",isChecked); 
       cb10.setChecked(true); 
       cb11.setChecked(true); 
       cb12.setChecked(true); 
      } 

     } 
    }); 

    cb14.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb14.isChecked()) 
      { 
       cb15.setChecked(true); 
       cb16.setChecked(true); 
       cb17.setChecked(true); 
       cb18.setChecked(true); 
      } 

     } 
    }); 

    cb21.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb21.isChecked()) 
      { 
       cb25.setChecked(true); 
      } 

     } 
    }); 

    cb24.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb24.isChecked()) 
      { 
       cb28.setChecked(true); 
      } 

     } 
    }); 

    cb3.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb3.isChecked()) 
      { 
       cb4.setChecked(true); 
       cb5.setChecked(true); 
       cb6.setChecked(true); 
       cb7.setChecked(true); 
      } 

     } 
    }); 

    cb23.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb23.isChecked()) 
      { 
       cb24.setChecked(true); 
       cb29.setChecked(true); 
       cb30.setChecked(true); 
       cb31.setChecked(true); 
      } 

     } 
    }); 

    cb32.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb32.isChecked()) 
      { 
       cb33.setChecked(true); 
       cb34.setChecked(true); 
       cb35.setChecked(true); 
       cb36.setChecked(true); 
      } 

     } 
    }); 

    cb2.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb2.isChecked()) 
      { 
       cb3.setChecked(true); 
       cb8.setChecked(true); 
       cb13.setChecked(true); 
       cb14.setChecked(true); 
      } 

     } 
    }); 

    cb19.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb19.isChecked()) 
      { 
       cb20.setChecked(true); 
       cb21.setChecked(true); 
       cb26.setChecked(true); 
       cb27.setChecked(true); 
      } 

     } 
    }); 

    cb22.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb22.isChecked()) 
      { 
       cb23.setChecked(true); 
       cb32.setChecked(true); 
       cb37.setChecked(true); 
       cb38.setChecked(true); 
      } 

     } 
    }); 

    cb1.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) 
     { 
      if (cb1.isChecked()) 
      { 
       cb2.setChecked(true); 
       cb19.setChecked(true); 
       cb22.setChecked(true); 
       cb39.setChecked(true); 
      } 

     } 
    }); 
} 

private boolean getFromSP(String key){ 
    SharedPreferences preferences = getApplicationContext().getSharedPreferences("GW2Legendary", android.content.Context.MODE_PRIVATE); 
    return preferences.getBoolean(key, false); 
    } 
    private void saveInSp(String key,boolean value){ 
    SharedPreferences preferences = getApplicationContext().getSharedPreferences("GW2Legendary", android.content.Context.MODE_PRIVATE); 
    SharedPreferences.Editor editor = preferences.edit(); 
    editor.putBoolean(key, value); 
    editor.commit(); 
    } 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.bifrost, menu); 
    return true; 
} 

}

再次，對不起，如果我複雜的太多，但我只是想學:)

來源

2013-06-11 Guy

什麼是例外您所看到的logcat的？ – kosa

我很抱歉打擾你，但正如我所說我是初學者。我如何檢查/訪問logcat？ http://developer.android.com/tools/help/logcat.html這並沒有多大幫助 – Guy

檢查此問題http://stackoverflow.com/questions/3280051/how-to-enable-logcat-console-in- eclipse-for-android – kosa

的問題是在這行代碼的初學者：

cb1.setOnCheckedChangeListener((OnCheckedChangeListener) this);

您的類未從繼承OnCheckedChangeListener，所以將Bitfrost投射到OnCheckedChangeListener會觸發ClassCastException。

嘗試爲OnCheckedChangeListener（後面的，匿名類和繼承的方法）分配「cb1」的新實例。

例子：

cb1.setOnCheckedChangeListener(new OnCheckedChangeListener() { 

    @Override 
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
     // TODO your code  
    } 
});

來源

2013-06-11 21:39:12 Mena

令人驚歎！非常感謝你，我這樣做，它完美的作品:) – Guy

使用共享首選項崩潰我的應用程序

回答

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