我的活动中有一个按钮可以填充数据库。我的方式是通过操作栏项目完成相同的事情。我不明白我的问题在哪里。 在没有按钮的情况下，使用操作栏中的saveItem最好的方法是什么。
public class ItemActivity extends AppCompatActivity {
public static final String LOG_TAG = ItemActivity.class.getSimpleName();
private
DeviceMemoSource dataSource;
Button action_save;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item);
action_save = (Button) findViewById(R.id.action_save);
Log.d(LOG_TAG, "Das Datenquellen-Objekt wird angelegt.");
dataSource = new DeviceMemoSource(this);
}
private void activateAddButton() {
Button buttonAddProduct = (Button) findViewById(R.id.action_save);
final EditText editText_Device_Number = (EditText) findViewById(R.id.editText_device_number);
final EditText editText_Device_Typ = (EditText) findViewById(R.id.editText_device_typ);
final EditText editText_Device_Date = (EditText) findViewById(R.id.editText_device_date);
final EditText editText_Device_Hits = (EditText) findViewById(R.id.editText_device_hits);
final EditText editText_Device_category = (EditText) findViewById(R.id.editText_device_category);
buttonAddProduct.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String numberString = editText_Device_Number.getText().toString();
String typ = editText_Device_Typ.getText().toString();
String date = editText_Device_Date.getText().toString();
String hits = editText_Device_Hits.getText().toString();
String category = editText_Device_category.getText().toString();
int number = Integer.parseInt(numberString);
editText_Device_Number.setText("");
editText_Device_Typ.setText("");
editText_Device_Date.setText("");
editText_Device_Hits.setText("");
editText_Device_category.setText("");
dataSource.createDeviceMemo(typ, number, date, hits, category);
InputMethodManager inputMethodManager;
inputMethodManager = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
if (getCurrentFocus() != null) {
inputMethodManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
}
showAllListEntries();
}
});
}
private void showAllListEntries() {
List<DeviceMemo> deviceMemoList = dataSource.getAllDeviceMemos();
ArrayAdapter<DeviceMemo> deviceMemoArrayAdapter = new ArrayAdapter<>(
this,
android.R.layout.simple_list_item_multiple_choice,
deviceMemoList);
ListView deviceMemosListView = (ListView) findViewById(R.id.listview_device_memos);
deviceMemosListView.setAdapter(deviceMemoArrayAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_item, menu);
return true;
}
@Override
protected void onResume() {
super.onResume();
Log.d(LOG_TAG, "Die Datenquelle wird geöffnet.");
dataSource.open();
Log.d(LOG_TAG, "Folgende Einträge sind in der Datenbank vorhanden:");
showAllListEntries();
}
@Override
protected void onPause() {
super.onPause();
Log.d(LOG_TAG, "Die Datenquelle wird geschlossen.");
dataSource.close();
}
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_save) {
activateAddButton();
return true;
} else if (id == R.id.about) {
Toast.makeText(getApplicationContext(), "aboutText", Toast.LENGTH_LONG).show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onStart() {
super.onStart();
}
@Override
public void onStop() {
super.onStop();
}
}
以及 XML：
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/action_save"
android:orderInCategory="100"
android:title="@string/save"
android:icon="@android:drawable/ic_menu_save"
app:actionViewClass="android.widget.button"
app:showAsAction="always"/>
<item
android:id="@+id/about"
android:orderInCategory="100"
android:title="@string/about"
app:showAsAction="never"/>