Android-Take Photo and save file

1 . 新增權限

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2 . 設定 RequestCode

public static final int TAKE_PHOTO_IMAGE_CODE = 1234;

3 . 開啟相機

Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(intent, TAKE_PHOTO_IMAGE_CODE);    

4 . 接收拍照結果

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == TAKE_PHOTO_IMAGE_CODE) 
    {
        //Check if data in not null 
        if (data != null)
        {
            Bitmap bitmap = (Bitmap)data.getExtras().get("data");
            imageView.setImageBitmap(bitmap);
        
        }
    }
}

5 . 如果要有儲存照片功能

public static final String FileName = "Hello";

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    //Check that request code matches ours:
    if (requestCode == TAKE_PHOTO_IMAGE_CODE) 
    {
        // 建立資料夾
        File imageStorageFolder = 
            new File(Environment.getExternalStorageDirectory()+File.separator + FileName);
            
        if (!imageStorageFolder.exists())
        {
            imageStorageFolder.mkdirs();
            Log.d(TAG , "Folder created at: "+imageStorageFolder.toString());
        }
        //Check if data in not null 
        if (data != null)
        {
            String imageName = "image";
            String fileNameExtension = ".jpg";
            File sdCard = Environment.getExternalStorageDirectory();
            String strImageStorageFolder = File.separator + FileName + File.separator;
            File destinationFile = 
                new File(sdCard, strImageStorageFolder + imageName + fileNameExtension);
            Log.d(TAG, "the destination for image file is: " + destinationFile );
            if (data.getExtras() != null)
            {
                Bitmap bitmap = (Bitmap)data.getExtras().get("data");
                //判斷照片為橫向或者為直向，並進入ScalePic判斷圖片是否要進行縮放
                if(bitmap.getWidth()>bitmap.getHeight())
                    ScalePic(bitmap,mPhone.heightPixels);
                else 
                    ScalePic(bitmap,mPhone.widthPixels);
                try
                {
                    FileOutputStream out = new FileOutputStream(destinationFile);
                    bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
                    out.flush();
                    out.close();
                } 
                catch (Exception e) 
                {
                    Log.e(TAG, "ERROR:" + e.toString());
                }
                
            }
        }
    }
}

private void ScalePic(Bitmap bitmap,int phone)
{
    //縮放比例預設為1
    float mScale = 1 ;
    //如果圖片寬度大於手機寬度則進行縮放，否則直接將圖片放入ImageView內
    if(bitmap.getWidth() > phone )
    {
        //判斷縮放比例
        mScale = (float)phone/(float)bitmap.getWidth();
        Matrix mMat = new Matrix() ;
        mMat.setScale(mScale, mScale);
        Bitmap mScaleBitmap = Bitmap.createBitmap(bitmap,
                0,
                0,
                bitmap.getWidth(),
                bitmap.getHeight(),
                mMat,
                false);
        imageView.setImageBitmap(mScaleBitmap);
    }
    else imageView.setImageBitmap(bitmap);
}

參考資料 : Android : Use Camera Activity for Thumbnail and FullSize Image
參考資料 : 【Android】開啟相機-照相功能與相簿-相片集並讀取相片匯入至程式

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