如何调用解码功能来解码图像

Question

如何使用解码功能来压缩和解码我的图像？我如何调用我的解码功能？

这条线：

image = decodeFile(getResources(),R.drawable.my); 

显示了一个错误：

The method decodeFile(File) in the type SQLiteDemoActivity is not applicable for the arguments (Resources, int)

代码：

ArrayList<Contact> imageArry = new ArrayList<Contact>(); 
ContactImageAdapter adapter; 
    Button BrowseButton; 
    Button BrowseButton2; 
DataBaseHandler db; 
    public static Bitmap image ; 
public static byte[] imageInByte; 



ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    db = new DataBaseHandler(this); 




    BrowseButton=(Button)findViewById(R.id.BrowseButton); 
    BrowseButton2=(Button)findViewById(R.id.BrowseButton2); 

adapter = new ContactImageAdapter(this, R.layout.screen_list, imageArry); 

    BrowseButton.setOnClickListener(new View.OnClickListener() { 

    @Override 
    public void onClick(View v) { 



    < this line show error--->  image = decodeFile(getResources(),R.drawable.my); 
    //BitmapFactory.decodeFile(photo.toString(),options); 
    image.compress(CompressFormat.JPEG, 100, stream); 
    imageInByte = stream.toByteArray(); 

    Log.d("Insert: ", "Inserting .."); 
    db.addContact(new Contact("FaceBook", imageInByte)); 



} 
    }); 

    BrowseButton2.setOnClickListener(new View.OnClickListener() { 

@Override 
public void onClick(View v) { 


    List<Contact> contacts = db.getAllContacts(); 
    for (Contact cn : contacts) { 




    String log = "ID:" + cn.getID() + " Name: " + cn.getName()  + " ,Image: " + cn.getImage(); 


    //Writing Contacts to log 
    Log.d("Result: ", log); 
    //add contacts data in arrayList 
    imageArry.add(cn); 

    } 

    ListView dataList = (ListView) findViewById(R.id.list); 
    dataList.setAdapter(adapter); 

    try { 
     stream.close(); 
     stream = null; 
    } catch (IOException e) { 

     e.printStackTrace(); 
    } 

} 
    }); 



      private Bitmap decodeFile(File f) { 
try { 
    // decode image size 
    BitmapFactory.Options o = new BitmapFactory.Options(); 
    o.inJustDecodeBounds = true; 
    BitmapFactory.decodeStream(new FileInputStream(f), null, o); 

    // Find the correct scale value. It should be the power of 2. 
    final int REQUIRED_SIZE = 70; 
    int width_tmp = o.outWidth, height_tmp = o.outHeight; 
    int scale = 1; 
    while (true) { 
     if (width_tmp/2 < REQUIRED_SIZE || height_tmp/2 < REQUIRED_SIZE) 
      break; 
     width_tmp /= 2; 
     height_tmp /= 2; 
     scale++; 
    } 

Answer 1

使用BitmapFatory.decodeResource(...)而不是decodeFile(...)。