在Windows桌面上體驗HTC Home

你喜歡HTC手機的板面嗎?

下載HTC Home便可以在Windows Vista 或 Windows 7桌面上體驗HTC.



HTC Home 2是一個時鐘, 天氣預報和動畫的部件(widget). 你可以看雲漂浮在你的桌面上, 雨滴滑落在你的屏幕, 甚至雷擊.


除了HTC Home的風格之外, 它還提供Windows Phone 7的Metro風格.


http://www.htchome.org/

香港電訊管理局(OFTA)推出寬頻表現測試網站

Android手機用戶可以在Android設備啟動Market搜索"OFTA".


此寬頻表現測試系統（"系統"）由電訊管理局（"電訊局"）委託香港國際互聯網交換中心設計、建立、操作和提供支援。

本系統讓寬頻服務用戶量度以下寬頻連接的表現—

下載速度指把數據從系統下載至用戶裝置的速度。

上載速度指把數據從用戶裝置上載至系統的速度。

網絡時延指把數據由用戶裝置發送至系統，以及其後用戶裝置從系統接收數據的來回時間。

封包遺失指從用戶裝置傳送數據至系統期間的封包遺失百分率。

抖動指接收封包延誤的變動。在傳送端，封包以連續流的方式傳送，封包與封包之間平均地分隔。由於網絡擠塞及其他因素，每個封包在接收時的時延或會有所不同，而不會維持不變。

系統以處理在香港境內的寬頻表現測試而設計。

本系統供用戶免費使用，然而用戶使用該網站時，須留意其寬頻服務供應商可能會向其徵收數據使用服務費用。位處香港境外的用戶（不論是否本地寬頻服務供應商的用戶）須注意，他們或須就接達系統繳付額外服務費，款額可能甚為可觀。

由於現時絶大部分寬頻服務的速度在每秒100兆比特以下，測試網站被調校至最適合測試每秒100兆比特或以下的寬頻服務。



iPhone 和 Android 手機的用戶

除桌上電腦和筆記簿電腦的用戶外，蘋果iPhone和Android手機的用戶也可接達本系統。相關應用軟件的正式名稱為"電訊局寬頻表現測試"（"OFTA Broadband Performance Test"），用戶可經以下途徑免費下載：

蘋果 iPhone: http://www.apple.com/iphone/apps-for-iphone

Android 手機 : http://www.android.com/market

用戶須注意，本系統只支援測量蘋果iPhone和Android手機的上載速度、下載速度和網絡時延。

Source: 電訊局寬頻表現測試

使用意圖"MediaStore.ACTION_IMAGE_CAPTURE"要求其他服務提供程序幫我們拍照

在之前另一篇文章描述了如何"實現Android照相機的拍照功能(Camera.takePicture)", 當然，這是一個很簡單的例子. 其實，有時我們不需要我們自己編寫所有的程序碼; Android提供了一種機制: 意圖(Intent).

通過使用意圖"android.provider.MediaStore.ACTION_IMAGE_CAPTURE", 我們可以要求其他服務提供程序幫助, Android操作系統會自動選擇合適的程序幫我們拍照, 然後再把圖片送回給我們.



main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<Button
   android:id="@+id/captureimage"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Call for ACTION_IMAGE_CAPTURE"
   />
<ImageView
   android:id="@+id/imagecaptured"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   />
</LinearLayout>

AndroidImageCapture.java

package com.AndroidImageCapture;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class AndroidImageCapture extends Activity {
 
 ImageView imageiewImageCaptured;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       Button buttonImageCapture = (Button)findViewById(R.id.captureimage);
       imageiewImageCaptured = (ImageView)findViewById(R.id.imagecaptured);
      
       buttonImageCapture.setOnClickListener(buttonImageCaptureOnClickListener);
   }
  
   Button.OnClickListener buttonImageCaptureOnClickListener
   = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
   startActivityForResult(intent, 0);
   
  }};

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  super.onActivityResult(requestCode, resultCode, data);
  
  if (resultCode == RESULT_OK)
  {
   Bundle extras = data.getExtras();
   Bitmap bmp = (Bitmap) extras.get("data");
   imageiewImageCaptured.setImageBitmap(bmp); 
  }
  
 }
}

相關文章:
- 通過EXTRA_OUTPUT, 指定儲存圖像的路徑

如何取消狀態欄通知(status bar notification)

前文示範"如何產生狀態欄通知(status bar notification)", 本文示範"如何取消狀態欄通知(status bar notification)".



你可以使用cancel(int)方法, 清除個別ID的通知. 或使用cancelAll()方法清除所有你的通知.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button
    android:id="@+id/fire1"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="- Fire Notification #1 -"
    />
<Button
    android:id="@+id/fire2"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="- Fire Notification #2 -"
    />
<Button
    android:id="@+id/clear1"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="- Clear Notification #1 -"
    />
<Button
    android:id="@+id/clear2"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="- Clear Notification #2 -"
    />
<Button
    android:id="@+id/clearall"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="- Clear ALL Notification -"
    />
</LinearLayout>

package com.AndroidStatusBarNotifications;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class AndroidStatusBarNotifications extends Activity {
 
 private static final int ID_My_Notification_1 = 1;
 private static final int ID_My_Notification_2 = 2;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button buttonFire1 = (Button)findViewById(R.id.fire1);
        Button buttonFire2 = (Button)findViewById(R.id.fire2);
        Button buttonClear1 = (Button)findViewById(R.id.clear1);
        Button buttonClear2 = (Button)findViewById(R.id.clear2);
        Button buttonClearAll = (Button)findViewById(R.id.clearall);
        buttonFire1.setOnClickListener(buttonFire1OnClickListener);
        buttonFire2.setOnClickListener(buttonFire2OnClickListener);
        buttonClear1.setOnClickListener(buttonClear1OnClickListener);
        buttonClear2.setOnClickListener(buttonClear2OnClickListener);
        buttonClearAll.setOnClickListener(buttonClearAllOnClickListener);
    }
    
    private Button.OnClickListener buttonClearAllOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   String ns = Context.NOTIFICATION_SERVICE;
   NotificationManager mNotificationManager = (NotificationManager)getSystemService(ns);
   mNotificationManager.cancelAll();
  }};
    
    private Button.OnClickListener buttonClear1OnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   clearNotification(ID_My_Notification_1);
  }};
  
 private Button.OnClickListener buttonClear2OnClickListener
 = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   clearNotification(ID_My_Notification_2);
  }};
  
 private void clearNotification(int notification_id){
  String ns = Context.NOTIFICATION_SERVICE;
  NotificationManager mNotificationManager = (NotificationManager)getSystemService(ns);
  mNotificationManager.cancel(notification_id);
 }
    
    private Button.OnClickListener buttonFire1OnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   fireNotification(ID_My_Notification_1);
  }};
  
 private Button.OnClickListener buttonFire2OnClickListener
 = new Button.OnClickListener(){
  
  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   fireNotification(ID_My_Notification_2);
  }};
  
 private void fireNotification(int notification_id){
   //Get a reference to the NotificationManager
   String ns = Context.NOTIFICATION_SERVICE;
   NotificationManager mNotificationManager = (NotificationManager)getSystemService(ns);
   
   //Instantiate the Notification
   int icon = android.R.drawable.ic_dialog_alert;
   CharSequence tickerText = "Hello" + String.valueOf(notification_id);
   long when = System.currentTimeMillis();

   Notification notification = new Notification(icon, tickerText, when);
   
   //Define the Notification's expanded message and Intent
   Context context = getApplicationContext();
   CharSequence contentTitle = "My Notification" + String.valueOf(notification_id);
   CharSequence contentText = "Hello My Notification!" + String.valueOf(notification_id);
   //Intent notificationIntent = new Intent(AndroidStatusBarNotifications.this, AndroidStatusBarNotifications.class);
   Intent notificationIntent = new Intent(getBaseContext(), AndroidStatusBarNotifications.class);
   PendingIntent contentIntent = PendingIntent.getActivity(AndroidStatusBarNotifications.this, 0, notificationIntent, 0);

   notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
   
   //Pass the Notification to the NotificationManager
   mNotificationManager.notify(notification_id, notification);
   
  }
}

狀態欄通知(status bar notification)

狀態欄通知(status bar notification)在系統的狀態欄之上添加一個圖標(連帶有可選的文本信息), 以及在“通知“窗口之上添加一個擴展信息.




創建狀態欄通知的基本步驟：

1 - 獲取NotificationManager引用對象(Get a reference to the NotificationManager)

2 - 實例化(Instantiate the Notification)

3 - 定義通知擴展的消息和意圖(Define the Notification's expanded message and Intent)

4 - 傳遞通知給其NotificationManager(Pass the Notification to the NotificationManager)

下面是一個簡單的例子:

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button
    android:id="@+id/fire"  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="- Fire Notification -"
    />
</LinearLayout>

AndroidStatusBarNotifications.java

package com.AndroidStatusBarNotifications;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class AndroidStatusBarNotifications extends Activity {
 
 private static final int ID_My_Notification = 1;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button buttonFire = (Button)findViewById(R.id.fire);
        buttonFire.setOnClickListener(buttonFireOnClickListener);
    }
    
    private Button.OnClickListener buttonFireOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   
   //Get a reference to the NotificationManager
   String ns = Context.NOTIFICATION_SERVICE;
   NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
   
   //Instantiate the Notification
   int icon = android.R.drawable.ic_dialog_alert;
   CharSequence tickerText = "Hello";
   long when = System.currentTimeMillis();

   Notification notification = new Notification(icon, tickerText, when);
   
   //Define the Notification's expanded message and Intent
   Context context = getApplicationContext();
   CharSequence contentTitle = "My Notification";
   CharSequence contentText = "Hello My Notification!";
   //Intent notificationIntent = new Intent(AndroidStatusBarNotifications.this, AndroidStatusBarNotifications.class);
   Intent notificationIntent = new Intent(getBaseContext(), AndroidStatusBarNotifications.class);
   PendingIntent contentIntent = PendingIntent.getActivity(AndroidStatusBarNotifications.this, 0, notificationIntent, 0);

   notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);
   
   //Pass the Notification to the NotificationManager
   mNotificationManager.notify(ID_My_Notification, notification);
   
  }};
}

相關文章:
- 如何取消狀態欄通知(status bar notification)

進度對話框(ProgressDialog)

本範例示範如何實現進度對話框(ProgressDialog), 通過異步任務(AsyncTask)啟動和關閉進度對話框.



啟動進度對話框:
ProgressDialog.show();

關閉進度對話框:
progressDialog.dismiss();

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button
    android:id="@+id/start"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="- Start -"
    />
</LinearLayout>

AndroidProgressDialog.java

package com.AndroidProgressDialog;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;

public class AndroidProgressDialog extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button buttonStart = (Button)findViewById(R.id.start);
        
        buttonStart.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    new asyncTaskUpdateProgress().execute();
   }
         
        });
        
    }
    
    public class asyncTaskUpdateProgress extends AsyncTask<Void, Integer, Void> {

     int progress;
     ProgressDialog progressDialog;
     
  @Override
  protected void onPostExecute(Void result) {
   // TODO Auto-generated method stub
   progressDialog.dismiss();
  }

  @Override
  protected void onPreExecute() {
   // TODO Auto-generated method stub
   progress = 0;
   progressDialog = ProgressDialog.show(AndroidProgressDialog.this, "ProgressDialog", "Wait!");
  }

  @Override
  protected Void doInBackground(Void... arg0) {
   // TODO Auto-generated method stub
   while(progress<100){
    progress++;
    SystemClock.sleep(20); 
   }
   return null;
  }
    }
}

香港HTC Wildfire已更新Android 2.2作業系統

香港HTC已公佈提供Wildfire Android 2.2作業系統軟體的無線更新



更新－HTC Wildfire 軟體無線更新
我們將於12月23 號開始提供HTC Wildfire無線軟體更新，系統會陸續送出更新提示，當您收到系統提示只要點選立即下載即可經由3G/GPRS或無線網路的連線方式，完成您的手機系統更新。(更新後請從功能表>設定>關於手機>軟體資訊>軟體號碼會更新成2.27.708.1即表示更新成功) 主要更新功能如下: Android 2.2作業系統升級 注意： 請先備份您資料，然後再升級裝置。建議您可選擇在有免費的Wi-Fi環境下載更新(例如:住家及辦公室等)。如您目前使用3G網路，下載可能須支付電信業者額外費用，請先確認已申租無限上網費率後再使用。如有疑問請致電 HTC 客服專線 +852-3520-1234。

如果還未收到OTA通知, 可以嘗試檢查系統軟件更新.

在HOME SCREEN, 按MENU鍵, 點擊About phone -> System software updates.

Google 快將為 Nexus One 更新薑餅(Gingerbread)操作系統.

Google透過Nexus One Twitter公佈: 將在未來幾週內以OTA為Nexus One更新薑餅(Gingerbread)操作系統.

The Gingerbread OTA for Nexus One will happen in the coming weeks. Just hang tight!

實現Android照相機的拍照功能(Camera.takePicture)

前文描述了"Android的照相機預覽功能(Camera Preview)", 本文進一步新增照相機的拍照功能.



修改AndroidManifest.xml
- 授予使用照相機權限, "android.permission.CAMERA"
- 並設定屏幕在一定的方向, android:screenOrientation="portrait"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.AndroidTakePicture"
     android:versionCode="1"
     android:versionName="1.0">
   <application android:icon="@drawable/icon" android:label="@string/app_name">
       <activity android:name=".AndroidTakePicture"
                 android:label="@string/app_name"
                 android:screenOrientation="portrait"
                 >
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>

   </application>
   <uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
</manifest>

修改佈局(main.xml), 再多添加一個Button.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<Button
   android:id="@+id/takebutton"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="- Take Picture -"
   />
<SurfaceView
android:id="@+id/previewsurface"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

主要代碼, AndroidTakePicture.java
主要是實踐ShutterCallback, 和PictureCallback, 調用takePicture()方法.
本應用程序運行的結果是一個圖片的Bitmap位圖, bitmapPicture.

package com.AndroidTakePicture;

import java.io.IOException;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

public class AndroidTakePicture extends Activity implements SurfaceHolder.Callback{

Camera myCamera;
SurfaceView previewSurfaceView;
SurfaceHolder previewSurfaceHolder;
boolean previewing = false;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       getWindow().setFormat(PixelFormat.UNKNOWN);     
       previewSurfaceView = (SurfaceView)findViewById(R.id.previewsurface);
       previewSurfaceHolder = previewSurfaceView.getHolder();
       previewSurfaceHolder.addCallback(this);
       previewSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
      
       Button buttonTakePicture = (Button)findViewById(R.id.takebutton);
       buttonTakePicture.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   myCamera.takePicture(shutterCallback, rawPictureCallback, jpegPictureCallback);
  }});
   }
  
   ShutterCallback shutterCallback = new ShutterCallback(){

 @Override
 public void onShutter() {
  // TODO Auto-generated method stub
 
 }};

PictureCallback rawPictureCallback = new PictureCallback(){

 @Override
 public void onPictureTaken(byte[] arg0, Camera arg1) {
  // TODO Auto-generated method stub
 
 }};

PictureCallback jpegPictureCallback = new PictureCallback(){

  @Override
  public void onPictureTaken(byte[] arg0, Camera arg1) {
   // TODO Auto-generated method stub
   Bitmap bitmapPicture = BitmapFactory.decodeByteArray(arg0, 0, arg0.length);    

  }};

@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
 // TODO Auto-generated method stub

 if(previewing){
  myCamera.stopPreview();
  previewing = false;
 }


 try {
  myCamera.setPreviewDisplay(arg0);
  myCamera.startPreview();
  previewing = true;
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }


}

@Override
public void surfaceCreated(SurfaceHolder arg0) {
 // TODO Auto-generated method stub
 myCamera = Camera.open();
}

@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
 // TODO Auto-generated method stub
 myCamera.stopPreview();
 myCamera.release();
 myCamera = null;
 previewing = false;
}
}

拍照後, 預覽顯示便會停止. 如果要不斷預覽的話, 需重新調用startPreview()方法.


相關文章:
- 使用意圖"MediaStore.ACTION_IMAGE_CAPTURE"要求其他服務提供程序幫我們拍照

照相機預覽功能(Camera Preview)畫面轉了90度!!!

據聞相機預覽功能(Camera Preview)並劃一標準化, 可能會出現畫面轉了90度!

(據聞)可以硬性設定屏幕方向便可解決問題:
- 通過XML設置屏幕方向(android:screenOrientation), 或
- 通過Java程序碼, 運行時設置屏幕方向 - setRequestedOrientation().

Android的照相機預覽功能(Camera Preview)

這是一個最簡單的照相機預覽功能的示範: 在佈局設置一個SurfaceView提供預覽功能; 本應用程式只能預覽, 並不支持其他如拍照等功能.




首先, 修改AndroidManifest.xml授予使用照相機權限, "android.permission.CAMERA".

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.AndroidCameraPreview"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".AndroidCameraPreview"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="7" />
    <uses-permission android:name="android.permission.CAMERA"></uses-permission>
</manifest> 

修改佈局(main.xml), 添加一個SurfaceView.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<SurfaceView
    android:id="@+id/previewsurface" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>

主要代碼, AndroidCameraPreview.java

package com.AndroidCameraPreview;

import java.io.IOException;

import android.app.Activity;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class AndroidCameraPreview extends Activity implements SurfaceHolder.Callback{
 
 Camera myCamera;
 SurfaceView previewSurfaceView;
 SurfaceHolder previewSurfaceHolder;
 boolean previewing = false;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        getWindow().setFormat(PixelFormat.UNKNOWN);      
        previewSurfaceView = (SurfaceView)findViewById(R.id.previewsurface);
        previewSurfaceHolder = previewSurfaceView.getHolder();
        previewSurfaceHolder.addCallback(this);
        previewSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

 @Override
 public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
  // TODO Auto-generated method stub
  
  if(previewing){
   myCamera.stopPreview();
   previewing = false;
  }
  
  
  try {
   myCamera.setPreviewDisplay(arg0);
   myCamera.startPreview();
   previewing = true;
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  
 }

 @Override
 public void surfaceCreated(SurfaceHolder arg0) {
  // TODO Auto-generated method stub
  myCamera = Camera.open();
 }

 @Override
 public void surfaceDestroyed(SurfaceHolder arg0) {
  // TODO Auto-generated method stub
  myCamera.stopPreview();
  myCamera.release();
  myCamera = null;
  previewing = false;
 }
}

主活動(AndroidCameraPreview)定義為extends Activity implements SurfaceHolder.Callback, 所以，我們必須重寫surfaceCreated(), surfaceChanged()和surfaceDestroyed()方法. 這裡亦是實現照相機預覽功能的主要部分.
以及, 需要在onCreate()方法中先設置我們的SurfaceHolder.


相關文章:
- 照相機預覽功能(Camera Preview)畫面轉了90度!!!
- 實現Android照相機的拍照功能(Camera.takePicture)

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跟隨 Android 2.3 SDK 發布的 Eclipse 插件 ADT 8.0.0 已經極速推出更新版本 ADT 8.0.1.

更新ADT:

在Eclipse點擊Help, 再點擊Check for Updateds.

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下載 Android 2.3 的用戶指南網址:

http://www.google.com/support/mobile/bin/answer.py?hl=en&answer=182077

千呼萬喚 - Google官方發布Android 2.3 SDK

對應Android 2.3的軟件開發工具包(Android SDK)現已推出. 此外也同時發布新的開發工具和文檔, 以及新的NDK. 欲了解更多有關新的Android 2.3, 請參考版本說明.

如果你已經安裝有Android SDK, 可以通過添加SDK component來安裝Android 2.3. 如果你還沒有, 可以安裝SDK starter package.

更多細節: Android Developers Blog - Android 2.3 Platform and Updated SDK Tools

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如果你想複製文件到Android模擬器上的SD Card中, 可以使用Android Debug Bridge(adb)工具的push指令.

./adb push <file to be copied> /sdcard/