Question

好吧这个标题可能听起来很奇怪，但我真的不知道如何解释它。

我正在尝试做的事情：查询数据库，使用#of结果定义字符串数组长度并使用结果填充视图。从理论上讲，所有这些都有效，但是当我尝试从onCreate“up”移动我的代码时，我得到了无法解决的语法错误。在下面的代码中阅读我的评论可能更有意义！

public class A_customlist extends ListActivity {

Integer runme = 5;
int[] imgb = new int[runme];
{
    for (int number = 0; number < imgb.length; number++) {
        imgb[number] = R.drawable.spatz_adult;
    }
    ;
};

SQLiteDatabase TPBDB;
String[] myString2 = new String[5];

// what I want to do: new String[count]
// basically do all the TPBDB stuff (see below) first, so I can access the
// count variable
// defining myString in onCreate makes it inaccessible in onListItemClick
String[] myString = new String[5];

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // "TPBDB stuff"
    TPBDB = openOrCreateDatabase("TPBDB1", MODE_PRIVATE, null);
    Cursor cur = TPBDB.rawQuery("SELECT * from Vogel", null);
    String mycur = cur.toString();
    int count = cur.getCount();
    cur.moveToFirst();

    // String[] myString = new String[count+1]; // 4 entries, runme = 5!

    for (Integer j = 0; j < count; j++) {
        myString[j] = Long.toString(cur.getLong(cur.getColumnIndex("uid")));
        myString2[j] = cur.getString(cur.getColumnIndex("datum"));
        cur.moveToNext();
    }
    ;

    TPBDB.close();
    // --- "TPBDB stuff"

    getListView().setDividerHeight(2);
    getListView().setAdapter(
            new BindDataAdapter(this, imgb, myString, myString2));
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    Builder builder = new AlertDialog.Builder(this);
    builder.setMessage(myString[position] + " is clicked.");
    builder.setPositiveButton("OK", null);
    builder.show();
}

// @Override
// public boolean onCreateOptionsMenu(Menu menu) {
// getMenuInflater().inflate(R.menu.activity_list, menu);
// return true;
// }

}

Answer 1

像这样你可以在onClickListener中访问你的数组，以防你想要实现的目标

String[] myString;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // "TPBDB stuff"
    TPBDB = openOrCreateDatabase("TPBDB1", MODE_PRIVATE, null);
    Cursor cur = TPBDB.rawQuery("SELECT * from Vogel", null);
    String mycur = cur.toString();
    int count = cur.getCount();

    myString = new String[count]; // init array here

    ...
}

你只需要在oncreate上面声明一个字段，你就不必同时初始化它。

Android / Java - 在不同的地方定义变量＆＃34;地点＆＃34;

1 个答案: