将签名图片保存到Android上的Rhodes文件中



我正在尝试使用Rhodes针对Android选项卡实现签名捕获。我已经设法获得画布并在上面乱涂乱画。但无法将签名保存在所需位置。signature_uri采用默认位置作为db/db-files/Image-XXXXXX.png

这是示例中的代码:

def signature_callback
if @params['status'] == 'ok'
  #create signature record in the DB
  signature = SignatureUtil.new({'signature_uri'=>@params['signature_uri']})
  signature.save
  puts "new Signature object: " + signature.inspect
end

在控制台中我得到

APP| RHO serve: /app/Settings/signature_callback
I/APP     (  801): I 01/26/2012 11:36:20:236 0000032e                  APP| Params: {"status"=>"ok", "signature_uri"=>"db/db-files/Image_20120126113618375.png", "rho_callback"=>"1"}
I/APP     (  801): I 01/26/2012 11:36:20:238 0000032e                  APP| *******************ok****************
I/APP     (  801): I 01/26/2012 11:36:20:238 0000032e                  APP| %%%%%%%%%%%%%%%%%db/db-files/Image_20120126113618375.png%%%%%%%%%%%
I/APP     (  801): I 01/26/2012 11:36:20:239 0000032e                  APP| App error: can't convert Symbol into Integer
I/APP     (  801):  lib/rhom/rhom_object_factory.rb:67:in `[]'
I/APP     (  801): lib/rhom/rhom_object_factory.rb:67:in `initialize'
I/APP     (  801): apps/app/Settings/controller.rb:34:in `new'
I/APP     (  801): apps/app/Settings/controller.rb:34:in `signature_callback'
I/APP     (  801): lib/rho/rhocontroller.rb:91:in `serve'
I/APP     (  801): lib/rho/rhoapplication.rb:209:in `serve'
I/APP     (  801): lib/rho/rho.rb:822:in `serve'
I/APP     (  801): E 01/26/2012 11:36:20:248 00000321                  Net| Request failed. HTTP Code: 500 returned. HTTP Response:         <html>
I/APP     (  801):             <head>
I/APP     (  801):                 <meta name="viewport" content="width=320"/>
I/APP     (  801):             </head>
I/APP     (  801):             <body>
I/APP     (  801):                 <h2>Server Error</h2>
I/APP     (  801):                 <p>
I/APP     (  801): Error: can't convert Symbol into Integer<br/>Trace: <br/

现在,我想把它保存在所需的位置,而不是这个数据库存储。请分享你的观点。

您是否已签出此页面:http://docs.rhomobile.com/rhodes/device-caps#file-系统访问?在我看来,您需要将图像保存到DB中,并使用Rho::RhoApplication::get_blob_path(image.image_uri)方法打开文件。然后,您应该能够使用文件系统API创建一个新文件,并将图像的内容写入您选择的任何位置。

只需尝试在签名uri中传递sd卡位置。请注意,在清单中给予sd卡读写权限。

其他

将签名文件从内部包复制到所需位置,但这是重复工作。

以下代码可能对有用

import java.io.File;
import java.io.FileOutputStream;
import java.util.Calendar;
import android.app.Activity; 
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore.Images;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;
 public class CaptureSignature extends Activity {
LinearLayout mContent;
signature mSignature;
Button mClear, mGetSign, mCancel;
public static String tempDir;
public int count = 1;
public String current = null;
private Bitmap mBitmap;
View mView;
File mypath;
private String uniqueId;
private EditText yourName;
@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.signature);
    tempDir = Environment.getExternalStorageDirectory() + "/" + getResources().getString(R.string.external_dir) + "/";
    ContextWrapper cw = new ContextWrapper(getApplicationContext());
    File directory = cw.getDir(getResources().getString(R.string.external_dir), Context.MODE_PRIVATE);
    prepareDirectory();
    uniqueId = getTodaysDate() + "_" + getCurrentTime() + "_" + Math.random();
    current = uniqueId + ".png";
    mypath= new File(directory,current);

    mContent = (LinearLayout) findViewById(R.id.linearLayout);
    mSignature = new signature(this, null);
    mSignature.setBackgroundColor(Color.WHITE);
    mContent.addView(mSignature, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
    mClear = (Button)findViewById(R.id.clear);
    mGetSign = (Button)findViewById(R.id.getsign);
    mGetSign.setEnabled(false);
    mCancel = (Button)findViewById(R.id.cancel);
    mView = mContent;
    yourName = (EditText) findViewById(R.id.yourName);
    mClear.setOnClickListener(new OnClickListener()
    {       
        public void onClick(View v)
        {
            Log.v("log_tag", "Panel Cleared");
            mSignature.clear();
            mGetSign.setEnabled(false);
        }
    });
    mGetSign.setOnClickListener(new OnClickListener()
    {       
        public void onClick(View v)
        {
            Log.v("log_tag", "Panel Saved");
            boolean error = captureSignature();
            if(!error){
                mView.setDrawingCacheEnabled(true);
                mSignature.save(mView);
                Bundle b = new Bundle();
                b.putString("status", "done");
                Intent intent = new Intent();
                intent.putExtras(b);
                setResult(RESULT_OK,intent);  
                finish();
            }
        }
    });
    mCancel.setOnClickListener(new OnClickListener()
    {       
        public void onClick(View v)
        {
            Log.v("log_tag", "Panel Canceled");
            Bundle b = new Bundle();
            b.putString("status", "cancel");
            Intent intent = new Intent();
            intent.putExtras(b);
            setResult(RESULT_OK,intent); 
            finish();
        }
    });
}
@Override
protected void onDestroy() {
    Log.w("GetSignature", "onDestory");
    super.onDestroy();
}
private boolean captureSignature() {
    boolean error = false;
    String errorMessage = "";

    if(yourName.getText().toString().equalsIgnoreCase("")){
        errorMessage = errorMessage + "Please enter your Namen";
        error = true;
    }  
    if(error){
        Toast toast = Toast.makeText(this, errorMessage, Toast.LENGTH_SHORT);
        toast.setGravity(Gravity.TOP, 105, 50);
        toast.show();
    }
    return error;
}
private String getTodaysDate() {
    final Calendar c = Calendar.getInstance();
    int todaysDate =     (c.get(Calendar.YEAR) * 10000) +
    ((c.get(Calendar.MONTH) + 1) * 100) +
    (c.get(Calendar.DAY_OF_MONTH));
    Log.w("DATE:",String.valueOf(todaysDate));
    return(String.valueOf(todaysDate));
}
private String getCurrentTime() {
    final Calendar c = Calendar.getInstance();
    int currentTime =     (c.get(Calendar.HOUR_OF_DAY) * 10000) +
    (c.get(Calendar.MINUTE) * 100) +
    (c.get(Calendar.SECOND));
    Log.w("TIME:",String.valueOf(currentTime));
    return(String.valueOf(currentTime));
}

private boolean prepareDirectory()
{
    try
    {
        if (makedirs())
        {
            return true;
        } else {
            return false;
        }
    } catch (Exception e)
    {
        e.printStackTrace();
        Toast.makeText(this, "Could not initiate File System.. Is Sdcard mounted properly?", 1000).show();
        return false;
    }
}
private boolean makedirs()
{
    File tempdir = new File(tempDir);
    if (!tempdir.exists())
        tempdir.mkdirs();
    if (tempdir.isDirectory())
    {
        File[] files = tempdir.listFiles();
        for (File file : files)
        {
            if (!file.delete())
            {
                System.out.println("Failed to delete " + file);
            }
        }
    }
    return (tempdir.isDirectory());
}
public class signature extends View
{
    private static final float STROKE_WIDTH = 5f;
    private static final float HALF_STROKE_WIDTH = STROKE_WIDTH / 2;
    private Paint paint = new Paint();
    private Path path = new Path();
    private float lastTouchX;
    private float lastTouchY;
    private final RectF dirtyRect = new RectF();
    public signature(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        paint.setAntiAlias(true);
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeJoin(Paint.Join.ROUND);
        paint.setStrokeWidth(STROKE_WIDTH);
    }
    public void save(View v)
    {
        Log.v("log_tag", "Width: " + v.getWidth());
        Log.v("log_tag", "Height: " + v.getHeight());
        if(mBitmap == null)
        {
            mBitmap =  Bitmap.createBitmap (mContent.getWidth(), mContent.getHeight(), Bitmap.Config.RGB_565);;
        }
        Canvas canvas = new Canvas(mBitmap);
        try
        {
            FileOutputStream mFileOutStream = new FileOutputStream(mypath);
            v.draw(canvas);
            mBitmap.compress(Bitmap.CompressFormat.PNG, 90, mFileOutStream);
            mFileOutStream.flush();
            mFileOutStream.close();
            String url = Images.Media.insertImage(getContentResolver(), mBitmap, "title", null);
            Log.v("log_tag","url: " + url);
            //In case you want to delete the file
            //boolean deleted = mypath.delete();
            //Log.v("log_tag","deleted: " + mypath.toString() + deleted);
            //If you want to convert the image to string use base64 converter
        }
        catch(Exception e)
        {
            Log.v("log_tag", e.toString());
        }
    }
    public void clear()
    {
        path.reset();
        invalidate();
    }
    @Override
    protected void onDraw(Canvas canvas)
    {
        canvas.drawPath(path, paint);
    }
    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        float eventX = event.getX();
        float eventY = event.getY();
        mGetSign.setEnabled(true);
        switch (event.getAction())
        {
        case MotionEvent.ACTION_DOWN:
            path.moveTo(eventX, eventY);
            lastTouchX = eventX;
            lastTouchY = eventY;
            return true;
        case MotionEvent.ACTION_MOVE:
        case MotionEvent.ACTION_UP:
            resetDirtyRect(eventX, eventY);
            int historySize = event.getHistorySize();
            for (int i = 0; i < historySize; i++)
            {
                float historicalX = event.getHistoricalX(i);
                float historicalY = event.getHistoricalY(i);
                expandDirtyRect(historicalX, historicalY);
                path.lineTo(historicalX, historicalY);
            }
            path.lineTo(eventX, eventY);
            break;
        default:
            debug("Ignored touch event: " + event.toString());
            return false;
        }
        invalidate((int) (dirtyRect.left - HALF_STROKE_WIDTH),
                (int) (dirtyRect.top - HALF_STROKE_WIDTH),
                (int) (dirtyRect.right + HALF_STROKE_WIDTH),
                (int) (dirtyRect.bottom + HALF_STROKE_WIDTH));
        lastTouchX = eventX;
        lastTouchY = eventY;
        return true;
    }
    private void debug(String string){
    }
    private void expandDirtyRect(float historicalX, float historicalY)
    {
        if (historicalX < dirtyRect.left)
        {
            dirtyRect.left = historicalX;
        }
        else if (historicalX > dirtyRect.right)
        {
            dirtyRect.right = historicalX;
        }
        if (historicalY < dirtyRect.top)
        {
            dirtyRect.top = historicalY;
        }
        else if (historicalY > dirtyRect.bottom)
        {
            dirtyRect.bottom = historicalY;
        }
    }
    private void resetDirtyRect(float eventX, float eventY)
    {
        dirtyRect.left = Math.min(lastTouchX, eventX);
        dirtyRect.right = Math.max(lastTouchX, eventX);
        dirtyRect.top = Math.min(lastTouchY, eventY);
        dirtyRect.bottom = Math.max(lastTouchY, eventY);
    }
}

}

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