我需要使用相机捕捉来点击图像＆gt;将图像保存在手机图库中＆gt;将该图像转换为灰度和阈值，最后使用php，JSON和Xampp（sql）将两个转换后的图像发送到服务器上。下面是代码。我知道灰度＆amp;阈值功能正常工作。请在我出错的地方纠正我。
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.app.ProgressDialog;
import android.widget.TextView;
import android.widget.Toast;
public class CamActivity extends Activity
{
private ImageView img;
int boundBoxInDp;
private static final int CAMERA_REQUEST = 1888;
Button bt1,bt2,btn;
ContentValues values;
int serverResponseCode = 0;
ProgressDialog dialog = null;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cam);
img = (ImageView)findViewById(R.id.imageView1);// Assign imageview
BitmapDrawable drawable = (BitmapDrawable) img.getDrawable();//get image drawable and assign to bitmap drawable
final Bitmap bmap = drawable.getBitmap();//assign bitmap drawable to bmap which is a bitmap image variable
ByteArrayOutputStream outStream = new ByteArrayOutputStream();//
bmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);// this and the line above can be ignored
//START CAMERA ON LAUNCH OF PAGE
Intent camera_intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
// Save code here
File f = new File(android.os.Environment.getExternalStorageDirectory(), "temp.png");
camera_intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
//Save code ends
startActivityForResult(camera_intent, CAMERA_REQUEST);
//START CAMERA ON LAUNCH OF PAGE ENDS
bt1=(Button)findViewById(R.id.button1);//button to go to next page
bt1.setOnClickListener (new OnClickListener()//click button to travel to the next page
{
public void onClick(View v)
{
img = (ImageView)findViewById(R.id.imageView1);
img.setScaleType(ScaleType.MATRIX);
BitmapDrawable drawable = (BitmapDrawable) img.getDrawable();
drawable.setFilterBitmap(true);
final Bitmap bmap = drawable.getBitmap();
//convert starts WORKS
//convert Bitmap to grayscale
Bitmap imgToGreyScale;
imgToGreyScale = toGrayscale(bmap);
//convert to threshold
Bitmap imgToBlackWhite;
imgToBlackWhite = ConvertToThreshold(imgToGreyScale);
//set Bitmap to imageView
ImageView imgbit;
imgbit = (ImageView) findViewById(R.id.imageView1);
imgbit.getImageMatrix();
imgbit.setImageBitmap(imgToBlackWhite);
// //conversion ends WORKS
Intent intent2 = new Intent(CamActivity.this,QrCodeActivity.class);
startActivity(intent2);
}
});
}
// FUNCTION STARTS--------------------------------------------------------------------------------------
//Threshold Function -WORKS-
public Bitmap ConvertToThreshold(Bitmap anythingBmap)
{
int width = anythingBmap.getWidth();
int height = anythingBmap.getHeight();
int threshold = 120;
for(int x=0;x<width;x++){
for(int y=0;y<height;y++){
int pixel = anythingBmap.getPixel(x, y);
int gray = Color.red(pixel);
if(gray < threshold){
anythingBmap.setPixel(x, y, 0xFF000000);
} else{
anythingBmap.setPixel(x, y, 0xFFFFFFFF);
}
}
}
return anythingBmap;
}
//Threshold function ends
// Grayscale Function -WORKS-
public Bitmap toGrayscale(Bitmap bmpOriginal){
int width, height;
height = bmpOriginal.getHeight();
width = bmpOriginal.getWidth();
Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
Canvas c = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
paint.setColorFilter(f);
c.drawBitmap(bmpOriginal, 0, 0, paint);
return bmpGrayscale;
}
// Grayscale Function ends
//FUNCTIONS ENDS----------------------------------------------------------------------------------------
//ONResult activity to get image
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK)
{
// IMAGEVIEW QUALITY WORKS and only one time temp save.
//
{
File f = new File(Environment.getExternalStorageDirectory().toString());
for (File temp : f.listFiles()) {
if (temp.getName().equals("temp.png")) {
f = temp;
break;
}
}
try {
Bitmap bitmap;
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmap = BitmapFactory.decodeFile(f.getAbsolutePath(),bitmapOptions);
img.setImageBitmap(bitmap);
String path = android.os.Environment.getExternalStorageDirectory()+ File.separator
+ "sdcard" + File.separator + "sdcard";
//f.delete();
OutputStream outFile = null;
File file = new File(path, String.valueOf(System.currentTimeMillis()) + ".png" +"");
try
{
outFile = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outFile);// Can Change to JPEG also
// the above line of code doesnt matter as it doesnt change the quality.
outFile.flush();
outFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}