Question

我正在制作一个简单的转换程序，我试图让用户从一个微调器菜单中选择“二进制，十进制......”项目列表，然后选择第二个选项“二进制，十进制”。。然后使用微调器右侧的文本字段输入值，然后点击“转换”按钮，它会吐出转换。

到目前为止，我已经能够构建2个文本字段和转换按钮并且有效，但是，我似乎无法弄清楚如何使文本字段与微调器菜单上的选择一起使用。

有什么建议吗？这就是我现在所拥有的--- ______ ------ ______ -----感谢提前:)）

MainActivity

package com.overworldinnovations.datatool;

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

import android.support.v7.app.ActionBarActivity;
//import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
//import android.os.Build;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {


private Spinner spinner1, spinner2;
private Button buttonConvert;


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


    addItemsOnSpinner2();
    addListenerOnButton();
    addListenerOnSpinnerItemSelection();

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();   
    }
}

public void addItemsOnSpinner2() {

    spinner2 = (Spinner) findViewById(R.id.spinner2);
    List<String> list = new ArrayList<String>();
    list.add("list 1");
    list.add("list 2");
    list.add("list 3");
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_spinner_item, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner2.setAdapter(dataAdapter);
  }

public void addListenerOnSpinnerItemSelection() {
    spinner1 = (Spinner) findViewById(R.id.spinner1);
    spinner1.setOnItemSelectedListener(new CustomOnItemSelectedListener());
  }

public void addListenerOnButton() {

    spinner1 = (Spinner) findViewById(R.id.spinner1);
    spinner2 = (Spinner) findViewById(R.id.spinner2);
    buttonConvert = (Button) findViewById(R.id.buttonConvert);

    buttonConvert.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {

        Toast.makeText(MainActivity.this,
        "OnClickListener : " + 
                "\nSpinner 1 : "+ String.valueOf(spinner1.getSelectedItem()) + 
                "\nSpinner 2 : "+ String.valueOf(spinner2.getSelectedItem()),
            Toast.LENGTH_SHORT).show();
      }

    });
}
@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;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}
}

activity_main

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.overworldinnovations.datatool.MainActivity"
tools:ignore="MergeRootFrame" >

 <Button
    android:id="@+id/buttonConvert"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_marginBottom="50dp"
    android:text="Convert" />

 <Spinner
    android:id="@+id/spinner1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:entries="@array/country_arrays"
    android:prompt="@string/country_prompt" />

 <Spinner
    android:id="@+id/spinner2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginTop="108dp" />

 <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/spinner1"
    android:layout_alignParentRight="true"
    android:layout_marginBottom="16dp"
    android:layout_marginRight="50dp"
    android:text="Medium Text"
    android:textAppearance="?android:attr/textAppearanceMedium" />

 <TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/spinner2"
    android:layout_alignLeft="@+id/textView1"
    android:layout_marginBottom="16dp"
    android:text="Medium Text"
    android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

的字符串

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="app_name">Data Tool</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="convert">Convert</string>
<string name="data_tool_is_an_application_that_converts_binary_to_decimal_d">Data Tool is an application that converts Binary to Decimal :D</string>
<string name ="country_prompt">Choose a country</string>

<string-array name = "type_arrays">
    <item >Decimal</item>
    <item >Binary</item>
    <item >Hexidecimal</item>
</string-array>
</resources>

CustomOnItemSelectedListener

package com.overworldinnovations.datatool;

import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Toast;

 public class CustomOnItemSelectedListener implements OnItemSelectedListener {

  public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
    Toast.makeText(parent.getContext(), 
        "OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
        Toast.LENGTH_SHORT).show();
   }

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

}

如何使用微调器在Eclipse中使用文本字段？

0 个答案: