Spinner小記

 

一、Activity部份代碼

// Generate spinner entries using XML arrays

intvisiblelimitValuesId= R.array.account_settings_down_count_values;

intvisiblelimitEntriesId= R.array.account_settings_down_count_entries;

CharSequence[] visiblelimitValues = getResources().getTextArray(visiblelimitValuesId);

CharSequence[] visiblelimitEntries = getResources().getTextArray(visiblelimitEntriesId);

// Now create the array used by the Spinner

SpinnerOption[] checkVisiblelimits =newSpinnerOption[visiblelimitEntries.length];

for(inti = 0; i < visiblelimitEntries.length; i++) {

checkVisiblelimits[i] =newSpinnerOption(

Integer.valueOf(visiblelimitValues[i].toString()), visiblelimitEntries[i].toString());

}

ArrayAdapter<SpinnerOption> checkVisiblelimitsAdapter =newArrayAdapter<SpinnerOption>(this,android.R.layout.simple_spinner_item, checkVisiblelimits);

checkVisiblelimitsAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

downloadCount.setAdapter(checkVisiblelimitsAdapter);

SpinnerOption.setSpinnerOptionValue(downloadCount,VISIBLE_LIMIT_DEFAULT);

二、SpinnerOption代碼

publicclassSpinnerOption {

publicfinalObjectvalue;

publicfinalStringlabel;

publicstaticvoidsetSpinnerOptionValue(

Spinner spinner, Object value) {

for(inti = 0, count = spinner.getCount(); i < count; i++) {

SpinnerOption so = (SpinnerOption)spinner.getItemAtPosition(i);

if(so.value.equals(value)) {

spinner.setSelection(i,true);

return;

}

}

}

publicSpinnerOption(Object value, String label) {

this.value= value;

this.label= label;

}

@Override

publicString toString() {

returnlabel;

}

三、如何獲取Spinner選中項值

intvisibelLimit = (Integer)((SpinnerOption)downloadCount.getSelectedItem()).value;

四、

<PreferenceCategory android:title="@string/account_settings_download_title">

<ListPreference

android:layout="?android:attr/preferenceLayoutChild"

android:dependency="account_down"

android:key="account_settings_down"

android:defaultValue="never"

android:title="@string/account_settings_download_title"

android:entries="@array/account_settings_down_entries"

android:entryValues="@array/account_settings_down_values"

android:dialogTitle="@string/account_settings_download_title"

/>

</PreferenceCategory>

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實例： 主要目的假如在values.xml文件中已定義6個StringArrays的Item的項目,在Spinner中屬性已定義Entries綁定了數據，不修改這2個文件下修改代碼，只顯示4個Item。

意思是重新綁定下即可。

java代碼

package luokan.commonui;

import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity {
	private Spinner spinner;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		spinner = (Spinner) findViewById(R.id.spinner);
		/*
		 * ArrayAdapter arrayadp = ArrayAdapter.createFromResource(this,
		 * R.array.spinner_arrays,android.R.layout.simple_spinner_item);
		 */
		
		int arraysValueID = R.array.spinner_arrays;
		String[] entriesValue = getResources().getStringArray(
				arraysValueID);
		/*new arrays */
		SpinnerOption[] optionsValue = new SpinnerOption[entriesValue.length-2];
		for (int i = 0; i < optionsValue.length; i++) {
			optionsValue[i] = new SpinnerOption(entriesValue[i].toString());
		}
		ArrayAdapter<SpinnerOption> arrayadp = new ArrayAdapter<SpinnerOption>(
				this, android.R.layout.simple_spinner_item, optionsValue);
		arrayadp.setDropDownViewResource(android.R.layout. simple_spinner_dropdown_item);
		spinner.setAdapter(arrayadp);
		spinner.setPrompt("信息：");
		
		//SpinnerOption.setSpinnerOptionValue(spinner,"");	
		
/*		spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
			public void onItemSelected(AdapterView<?> parent, View view,
					int position, long id) {
				Toast.makeText(getApplicationContext(), position + "", 0)
						.show();
			}

			public void onNothingSelected(AdapterView<?> parent) {

				Toast.makeText(getApplicationContext(), "ʲôҲûѡ", 0).show();
			}
		});*/
	}
}

一個放新數組的類:

package luokan.commonui;

import android.widget.Spinner;

public class SpinnerOption {
	public String value;
	public SpinnerOption(String value) {
		this.value = value;
	}
	public static void setSpinnerOptionValue(Spinner spinner, Object value) {
		for (int i = 0, count = spinner.getCount(); i < count; i++) {
			SpinnerOption so = (SpinnerOption) spinner.getItemAtPosition(i);
			//if (so.value.equals(value)) {
				spinner.setSelection(i, true);
				return;
		//	}
		}
	}
	@Override
	public String toString() {
		return value;
	}
	
}

    <Spinner
    android:id="@+id/spinner"
     android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:entries="@array/spinner_arrays"
    >
    </Spinner>

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <string name="hello">Hello World, MainActivity!</string>
 <string name="app_name">常用Ui</string>
 <string-array name="spinner_arrays">
  <item>abc</item>
  <item>edf</item>
  <item>sss</item>
  <item>eeee</item>
  <item>fffffff</item>
 <item>tttt</item>
</string-array>
</resources>

 

 

 --------------------------------------------------------------spinner在dialog對話框內的使用，,,-----------在Activity消亡之前把dialog。dismiss掉；否則發生窗口泄漏異常。

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.Spinner;
import android.widget.TextView;

public class Activity03 extends Activity implements AdapterView.OnItemSelectedListener{

 private final static int DIALOG_PAUSED_ID = 1;
 private TextView text,myTextView2;
 private View mView;
 AlertDialog alert;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.three);
  mView = getLayoutInflater().inflate(R.layout.spinner, null);
        Spinner spinner = ((Spinner) mView.findViewById(R.id.spinner));
        
      //  spinner.setSelection(1);
        spinner.setOnItemSelectedListener(this);
  findViewById(R.id.myButton03).setOnClickListener(new OnClickListener(){
   public void onClick(View v) {
   // showDialog(DIALOG_PAUSED_ID);
    createDialog();
   }
   
  });
  text = (TextView) findViewById(R.id.myTextView03);
  myTextView2 = (TextView)mView.findViewById(R.id.myTextView2);
 }
 
 
    @Override
    protected Dialog onCreateDialog(int id) {
        if (id == DIALOG_PAUSED_ID) {
         //   return createDialog();
        }
        return null;
    }
    
    public void createDialog(){
     Log.i("other", "come on");
        AlertDialog.Builder builder = new AlertDialog.Builder(this); 
         builder.setMessage("Are you sure you want to exit?") 
                .setCancelable(false)
                .setView(mView)
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
                    public void onClick(DialogInterface dialog, int id) { 
                       //  MyActivity.this.finish(); 
                     dialog.cancel();
                    } 
                }) 
                .setNegativeButton("No", new DialogInterface.OnClickListener() { 
                    public void onClick(DialogInterface dialog, int id) { 
                         dialog.cancel(); 
                    } 
                }); 
         alert = builder.create(); 
         alert.show();
    }


 public void onItemSelected(AdapterView<?> parent, View view, int position,
   long id) {
 // myTextView2.setText(position);
 }


 public void onNothingSelected(AdapterView<?> parent) {
  // TODO Auto-generated method stub
  
 }
/* @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  if(keyCode == KeyEvent.KEYCODE_HOME){
   Log.i("other", "alert dismiss..come on");   
   finish();
  }
  return super.onKeyDown(keyCode, event);
 }*/
 @Override
 protected void onPause() {
  Log.i("other", "alert dismiss..come on");
       if (alert != null) {
        alert.dismiss();
        alert = null;
         }
  super.onPause();
 }
}

mainifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="mars.activity"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Activity01"
                  android:label="@string/app_name"  
                  android:taskAffinity="mars.activity.Activity01"
                android:clearTaskOnLaunch="true"
                android:launchMode="singleTop">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        <activity android:name=".Activity02" android:clearTaskOnLaunch="true"
                  android:label="@string/app_name" >
      
        </activity>
   <activity android:name=".Activity03"
                  android:label="@string/app_name"
                    android:configChanges="orientation|keyboardHidden"
               >

        </activity>
    </application>
    <uses-sdk android:minSdkVersion="5" />

</manifest>