Android 使用SimpleCursorAdapter更新ListView（无需重新初始化适配器）

我想使用

SimpleCursorAdapter

更新

活动中的
ListView
小部件。我可以通过每次按下
按钮时初始化
simpledapter
将项目添加到我的
列表视图中，如下所示：

public void saveButton(View view){

    EditText editText = (EditText) findViewById(R.id.edit_text);
    String data = editText.getText().toString();

    database.insertData(data);
    Log.v("database",database.getAllData().toString());

    // initialization happens every time upon click. 
    // This method is coupled to a Button's onClick attribute.   

    SimpleCursorAdapter adapter = new SimpleCursorAdapter(getApplicationContext(),R.layout.layout_file,database.getAllData(),new String[]{"candy"},new int[]{R.id.label},SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
    listview.setAdapter(adapter);

}

但是，我希望复制相同的行为，而不必每次都重新初始化
SimpleCursorAdapter
。我尝试使用
bindView
方法，但我的ListView本身没有更新

这是全部代码。第一个是
活动
：

public class MainActivity extends Activity {

ListView listview; 
DatabaseTools database; 

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

    database = new DatabaseTools(getApplicationContext(),null,null,1);

    //ArrayList<String> result = database.getAllData();
    Cursor cursor = database.getAllData();

    listview = (ListView) findViewById(R.id.list_view);
    SimpleCursorAdapter adapter = new SimpleCursorAdapter(getApplicationContext(),R.layout.layout_file,cursor,new String[]{"candy"},new int[]{R.id.label},SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
    listview.setAdapter(adapter);

}

@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 saveButton(View view){

    EditText editText = (EditText) findViewById(R.id.edit_text);
    String data = editText.getText().toString();

    database.insertData(data);
    Log.v("database",database.getAllData().toString());

    SimpleCursorAdapter adapter = new SimpleCursorAdapter(getApplicationContext(),R.layout.layout_file,database.getAllData(),new String[]{"candy"},new int[]{R.id.label},SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
    listview.setAdapter(adapter);

}

}

回答自己的问题。通过调用
SimpleCursorAdapter
的
changeCursor（）
方法可以解决此问题

public void saveButton(View view){

    EditText editText = (EditText) findViewById(R.id.edit_text);
    String data = editText.getText().toString();

    database.insertData(data);
    Log.v("database",database.getAllData().toString());

    // using the changeCursor method provides a cursor that can be
    // updated with a 'screenshot' of the latest data returned by the database.     
    SimpleCursorAdapter adapter = (SimpleCursorAdapter) listview.getAdapter();
    adapter.changeCursor(database.getAllData());

}

根据文档，
changeCursor（）

将基础光标更改为新光标。如果存在一个现有的光标，它将被关闭

public void saveButton(View view){

    EditText editText = (EditText) findViewById(R.id.edit_text);
    String data = editText.getText().toString();

    database.insertData(data);
    Log.v("database",database.getAllData().toString());

    // using the changeCursor method provides a cursor that can be
    // updated with a 'screenshot' of the latest data returned by the database.     
    SimpleCursorAdapter adapter = (SimpleCursorAdapter) listview.getAdapter();
    adapter.changeCursor(database.getAllData());

}