Java 查询数据库中微调器上的项目-Android

我有一个名为“SecondActivity”的活动，下面是完整的代码

package br.exemplosqlite;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import org.w3c.dom.Text;

public class SecondActivity extends Activity implements AdapterView.OnItemSelectedListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        //referencia a Spinner
        //Spinner coligada;

        //final TextView nome = (TextView)findViewById(R.id.txvNome);
        //final TextView sobrenome = (TextView)findViewById(R.id.txvSobrenome);
        //final Spinner pday = (Spinner)findViewById(R.id.spinner);

        final Spinner spcoligada = (Spinner) findViewById(R.id.coligada);

        //spinner = (Spinner)findViewById(R.id.spinner);

        ArrayAdapter adaptercoligada = ArrayAdapter.createFromResource(this, R.array.coligada, android.R.layout.simple_spinner_item);
        spcoligada.setAdapter(adaptercoligada);

        Button ok = (Button)findViewById(R.id.btnok);

        ok.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //chamada para a nova Activity
                Intent intent = new Intent(SecondActivity.this, ListUsersActivity.class);
                intent.putExtra("coligada", spcoligada.getSelectedItem().toString());

                //intent.putExtra("nomePessoa", nome.getText().toString());
                //intent.putExtra("sobrenomePessoa", sobrenome.getText().toString());
                //intent.putExtra("day", pday.getSelectedItem().toString());

                startActivity(intent);
            }
        });
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {
    }
}

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这就是您的解决方案的代码

Spinner spcoligada = (Spinner) findViewById(R.id.coligada);
 private static final String itemSelected=spcoligada.getSelectedItem();
Cursor cursor = bd.query(itemSelected, new String[]{ColumnName1, ColumnName2, Column2,ColumnName3,ColumnName4},
                null, null, null, null, null);

---

这就是您的解决方案的代码

Spinner spcoligada = (Spinner) findViewById(R.id.coligada);
 private static final String itemSelected=spcoligada.getSelectedItem();
Cursor cursor = bd.query(itemSelected, new String[]{ColumnName1, ColumnName2, Column2,ColumnName3,ColumnName4},
                null, null, null, null, null);

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我找到了解决办法

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我创建了一个类Global，然后在Select上将Global变量的值分配给Spiner

我找到了解决办法

---

我创建了一个类Global，然后在Select上将Global变量的值分配给Spiner

不起作用，因为在删除静态和私有修饰符后，给出错误“此处不允许使用静态修饰符”。微调器spcoligada=（微调器）findViewById（R.id.coligada）；String itemSelected=spcoligada.getSelectedItem（）；Cursor Cursor=bd.query（itemSelected，新字符串[]{ColumnName1，ColumnName2，Column2，ColumnName3，ColumnName4}，null，null，null，null）；不起作用，因为光标位于其他活动中。不起作用，因为在删除静态和私有修饰符后出现错误“此处不允许使用静态修饰符”。微调器spcoligada=（微调器）findViewById（R.id.coligada）；String itemSelected=spcoligada.getSelectedItem（）；Cursor Cursor=bd.query（itemSelected，新字符串[]{ColumnName1，ColumnName2，Column2，ColumnName3，ColumnName4}，null，null，null，null）；不工作，因为光标位于其他活动中。

Spinner spcoligada = (Spinner) findViewById(R.id.coligada);
 private static final String itemSelected=spcoligada.getSelectedItem();
Cursor cursor = bd.query(itemSelected, new String[]{ColumnName1, ColumnName2, Column2,ColumnName3,ColumnName4},
                null, null, null, null, null);