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我發現另一個帖子上我的問題的一個很好的解決方案(Save entered text in editText via button)EditText手機內存?
但是,當我實現此代碼時,我的應用程序崩潰。任何意見將不勝感激,我收到的錯誤是方法makeTag()中的「字符串或」不使用。請看看
private Button savenotebutton1;
private SharedPreferences savednotes;
private EditText editText1;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.x1);
savenotebutton1 = (Button) findViewById(R.id.savenotebutton1);
editText1 = (EditText) findViewById(R.id.noteEditText1);
savednotes = getSharedPreferences("notes",MODE_PRIVATE);
editText1.setText(savednotes.getString("tag", "Default Value")); //add this line
savenotebutton1.setOnClickListener(saveButtonListener);
}
private void makeTag(String tag){
String or = savednotes.getString(tag, null);
SharedPreferences.Editor preferencesEditor = savednotes.edit();
preferencesEditor.putString("tag",tag); //change this line to this
preferencesEditor.commit();
}
public OnClickListener saveButtonListener = new OnClickListener(){
@Override
public void onClick(View v) {
if(editText1.getText().length()>0){
makeTag(editText1.getText().toString());
((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(editText1.getWindowToken(),0);
}
}
};
}
請發佈您的logcat錯誤 –
嘗試將此字符串或= savednotes.getString(tag,「」);'轉換爲您的makeTag –
進程(1411):發送信號。 PID:1411 SIG:9 :W/dalvikvm(1451):threadid = 1:以未捕獲異常退出的線程(group = 0xb3ae8ba8) 4:E/AndroidRuntime(1451):致命例外:main :E/AndroidRuntime(1451 ):進程:com.example.savingtext,PID:1451 03-01 06:36:14.264:E/AndroidRuntime(1451):java.lang.RuntimeException:無法實例化活動ComponentInfo {com.example.savingtext/com。 example.savingtext.MainActivity}:java.lang.ClassNotFoundException:找不到類 – user3368012