Question

你好朋友我试图根据我的记录选择启用edittext。XML文件如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Spinner 
        android:id="@+id/per_id"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:spinnerMode="dropdown"
        android:gravity="center"
        android:layout_marginTop="20dp"/>

    <Spinner android:id="@+id/columnToUpdate"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:spinnerMode="dialog"
        android:gravity="center"
        android:layout_marginTop="20dp"/>

    <EditText 
        android:id="@+id/enterToUpdateString"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_marginTop="20dp"
        android:inputType="text"
        android:hint="@string/EnterTheTextHere"/>
    <EditText 
        android:id="@+id/enterToUpdateInt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_marginTop="20dp"
        android:inputType="number"
        android:hint="@string/EnterTheNumberHere"/>


    <Button 
        android:id="@+id/clickToUpdate"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/clickToUpdate"/>
</LinearLayout>

我正在申请的Java代码如下： -

package com.indianic.databaseprac;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;

public class UpdateFrom25Table extends Activity {
    String id, column, text;
    EditText integertext;
    EditText stringText;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.update_from_25_table);

        stringText = (EditText) findViewById(R.id.enterToUpdateString);
        integertext = (EditText) findViewById(R.id.enterToUpdateInt);
        stringText.setVisibility(View.GONE);
        integertext.setVisibility(View.GONE);
        Button updateButton = (Button) findViewById(R.id.clickToUpdate);

        // Here I am setting the spinner where I am taking the content of the
        // table per_ID having all the unique IDs and setting it to the spinner
        Spinner spinnerid = (Spinner) findViewById(R.id.per_id);

        final Database25TableHandler db = new Database25TableHandler(
                getApplicationContext());
        List<String> ids = db.gettingid();
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, ids);
        dataAdapter
                .setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
        spinnerid.setAdapter(dataAdapter);

        // Here I am setting all the column names in the second spinner with the
        // help of the cursor.
        Spinner spinnerColumn = (Spinner) findViewById(R.id.columnToUpdate);

        List<String> column = db.getcolumnname();
        ArrayAdapter<String> dataAdaptercolumn = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, column);
        dataAdaptercolumn
                .setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
        spinnerColumn.setAdapter(dataAdaptercolumn);


        final String spinnerSelectedID = (String) spinnerid.getSelectedItem();
        final String spinnerSelectedcolumn = (String) spinnerColumn
                .getSelectedItem();


        spinnerColumn.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int pos, long id) {
                Log.d("TESTING", parent.getItemAtPosition(pos).toString());

// TODO Auto-generated method stub
                if(parent.getItemAtPosition(pos).toString() == "reg_id") {
                    //integertext.setEnabled(true);
                    Log.d("TESTING", "LOOOOGGGGG");
                    integertext.setVisibility(View.VISIBLE);
                    text = integertext.getText().toString();

                } else if (parent.getItemAtPosition(pos).toString() == "first_name") {
                    //stringText.setEnabled(true);
                    stringText.setVisibility(View.VISIBLE);
                    text = stringText.getText().toString();

                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }
        });
        // Here I am setting all the Items that are selected in the string in
        // order to perform the update process.

        updateButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                db.updateRow(spinnerSelectedID, spinnerSelectedcolumn, text);
                db.close();
            }
        });

    }


}

这里即使我从微调器中选择了reg_id，它也没有输入第一个if部分作为Log.d（“TESTING”，“LOOOOGGGGG”）;没有打印

Answer 1

试试这个..

如果您比较字符串，则应使用.equels

if(parent.getItemAtPosition(pos).toString().equels("reg_id")) {
                    //integertext.setEnabled(true);
                    Log.d("TESTING", "LOOOOGGGGG");
                    integertext.setVisibility(View.VISIBLE);
                    text = integertext.getText().toString();

                } else if (parent.getItemAtPosition(pos).toString().equels("first_name")) {
                    //stringText.setEnabled(true);
                    stringText.setVisibility(View.VISIBLE);
                    text = stringText.getText().toString();

                }

==总是只比较两个引用（对于非基元，即），即它测试两个操作数是否引用同一个对象。

但是，可以覆盖equals方法 - 因此两个不同的对象仍然可以相等

修改

if(parent.getItemAtPosition(pos).toString().equalsIgnoreCase("reg_id") || parent.getItemAtPosition(pos).toString().equels("first_name")){ }

Answer 2

你应该使用.equals（String）方法进行字符串比较（执行简单的'浅'比较）而不是'=='比较（执行'深'比较 - 验证两个字符串对象是否指向内存中的相同实例。）

此外，要切换启用/禁用状态，您需要使用setEnabled（boolean）方法。 setEnabled（true）将设置要启用的edittext，setEnabled（false）将禁用edittext。

从Spinner中选择Item时启用Edittext

2 个答案: