Android[進階教程] Android程式調用網路攝影機

很多開發人員都想在程式用來調用網路攝影機，並對拍出的照片進行處理。首先先對程式的進行一下預覽

 



 

首先先對首頁面進行設計，這裡很簡單，只是加了個按鈕和一張圖片

[html] <?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" > 
 
 
    <Button 
        android:id="@+id/button1" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/camera" /> 
 
 
 
 
    <ImageView 
        android:id="@+id/imageView1" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:src="@drawable/ic_launcher" /> 
 
</LinearLayout> 
<?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" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/camera" />

 

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

接下來就是對按鈕事件進行處理，按下按鈕的時候會調用本機網路攝影機

[java] //圖片存入地址   www.2cto.com
        imageFilePath = Environment.getExternalStorageDirectory() 
                .getAbsolutePath() + "/mypicture.jpg"; 
        File imageFile = new File(imageFilePath); 
        Uri imageFileUri = Uri.fromFile(imageFile); 
 
        Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
        i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageFileUri); 
        startActivityForResult(i, CAMERA_RESULT); 
//圖片存入地址
  imageFilePath = Environment.getExternalStorageDirectory()
    .getAbsolutePath() + "/mypicture.jpg";
  File imageFile = new File(imageFilePath);
  Uri imageFileUri = Uri.fromFile(imageFile);

  Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
  i.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, imageFileUri);
  startActivityForResult(i, CAMERA_RESULT);

 

Intent直接調用了原生拍照程式，並把拍的圖片存在記憶卡裡，接下來就是要在我們自己的程式裡顯示拍的照片了
這裡我們直接用了Activity裡的onActivityResult這個方法，這個方法是對Activity返回結果的處理
[java] @Override
    protected void onActivityResult(int requestCode, int resultCode, 
            Intent intent) { 
        // TODO Auto-generated method stub  
        super.onActivityResult(requestCode, resultCode, intent); 
 
        //如果拍照成功  
        if (resultCode == RESULT_OK) { 
 
            // Bundle extras = intent.getExtras();  
            // Bitmap bmp = (Bitmap)extras.get("data");  
 
            imv = (ImageView) findViewById(R.id.imageView1); 
 
            //取得螢幕的顯示大小  
            Display currentDisplay = getWindowManager().getDefaultDisplay(); 
            int dw = currentDisplay.getWidth(); 
            int dh = currentDisplay.getHeight(); 
 
            //對拍出的照片進行縮放  
            BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options(); 
            bmpFactoryOptions.inJustDecodeBounds = true; 
            Bitmap bmp = BitmapFactory.decodeFile(imageFilePath, 
                    bmpFactoryOptions); 
 
            int heightRatio = (int) Math.ceil(bmpFactoryOptions.outHeight 
                    / (float) dh); 
            int widthRatio = (int) Math.ceil(bmpFactoryOptions.outWidth 
                    / (float) dw); 
 
            if (heightRatio > 1 && widthRatio > 1) { 
 
                if (heightRatio > widthRatio) { 
 
                    bmpFactoryOptions.inSampleSize = heightRatio; 
                } else { 
                    bmpFactoryOptions.inSampleSize = widthRatio; 
                } 
 
            } 
 
            bmpFactoryOptions.inJustDecodeBounds = false; 
            bmp = BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions); 
 
            imv.setImageBitmap(bmp); 
 
        } 
    } 
@Override
 protected void onActivityResult(int requestCode, int resultCode,
   Intent intent) {
  // TODO Auto-generated method stub
  super.onActivityResult(requestCode, resultCode, intent);

  //如果拍照成功
  if (resultCode == RESULT_OK) {

   // Bundle extras = intent.getExtras();
   // Bitmap bmp = (Bitmap)extras.get("data");

   imv = (ImageView) findViewById(R.id.imageView1);

   //取得螢幕的顯示大小
   Display currentDisplay = getWindowManager().getDefaultDisplay();
   int dw = currentDisplay.getWidth();
   int dh = currentDisplay.getHeight();

   //對拍出的照片進行縮放
   BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
   bmpFactoryOptions.inJustDecodeBounds = true;
   Bitmap bmp = BitmapFactory.decodeFile(imageFilePath,
     bmpFactoryOptions);

   int heightRatio = (int) Math.ceil(bmpFactoryOptions.outHeight
     / (float) dh);
   int widthRatio = (int) Math.ceil(bmpFactoryOptions.outWidth
     / (float) dw);

   if (heightRatio > 1 && widthRatio > 1) {

    if (heightRatio > widthRatio) {

     bmpFactoryOptions.inSampleSize = heightRatio;
    } else {
     bmpFactoryOptions.inSampleSize = widthRatio;
    }

   }

   bmpFactoryOptions.inJustDecodeBounds = false;
   bmp = BitmapFactory.decodeFile(imageFilePath, bmpFactoryOptions);

   imv.setImageBitmap(bmp);

  }
 }
這裡我們就完成了對本機網路攝影機的調用，其實在這裡主要要學習的是startActivityForResult和onActivityResult這兩個方法，一個是調用Activity並將結果返回給調用的Activity，一個就是處理返回的資料了，好了，如果哪位想要程式的話，可以直接留郵件地址。

 摘自 kangkangz4的專欄