Question

我想从图库或相机中裁剪图像，并获得原始图像的裁剪坐标X和Y，而不是裁剪的。

我需要这些坐标才能在POST请求中使用它们，在那里我发送原始图像和裁剪的坐标。

我该怎么做？

Answer 1

您需要使用DragRectView类来读取所有Touch事件和Motion事件，然后在Canvas中绘制一个矩形。使用onTouchEvent函数，您可以从X和Y值获得坐标。

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class DragRectView extends View {

    private Paint mRectPaint;    
    private int mStartX = 0;
    private int mStartY = 0;
    private int mEndX = 0;
    private int mEndY = 0;
    private boolean mDrawRect = false;
    private TextPaint mTextPaint = null;

    private OnUpCallback mCallback = null;

    public interface OnUpCallback {
        void onRectFinished(Rect rect);
    }

    public DragRectView(final Context context) {
        super(context);
        init();
    }

    public DragRectView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public DragRectView(final Context context, final AttributeSet attrs,     final int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public void setOnUpCallback(OnUpCallback callback) {
        mCallback = callback;
    }

    private void init() {
        mRectPaint = new Paint();
            mRectPaint.setColor(getContext().getResources().getColor(android.R.color.holo_gr    een_light));
        mRectPaint.setStyle(Paint.Style.STROKE);
        mRectPaint.setStrokeWidth(5);

        mTextPaint = new TextPaint();
            mTextPaint.setColor(getContext().getResources().getColor(android.R.color.holo_gr    een_light));
        mTextPaint.setTextSize(20);
    }

    @Override
    public boolean onTouchEvent(final MotionEvent event) {

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mDrawRect = false;
                mStartX = (int) event.getX();
                mStartY = (int) event.getY();
                invalidate();
                break;

            case MotionEvent.ACTION_MOVE:
                final int x = (int) event.getX();
                final int y = (int) event.getY();

                if (!mDrawRect || Math.abs(x - mEndX) > 5 || Math.abs(y -     mEndY) > 5) {
                    mEndX = x;
                    mEndY = y;
                    invalidate();
                }

                mDrawRect = true;
                break;

            case MotionEvent.ACTION_UP:
                if (mCallback != null) {
                    mCallback.onRectFinished(new Rect(Math.min(mStartX,     mEndX), Math.min(mStartY, mEndY),
                            Math.max(mEndX, mStartX), Math.max(mEndY,     mStartX)));
                }
                invalidate();
                break;

            default:
                break;
        }

        return true;
    }

    @Override
    protected void onDraw(final Canvas canvas) {
        super.onDraw(canvas);

        if (mDrawRect) {
            canvas.drawRect(Math.min(mStartX, mEndX), Math.min(mStartY, mEndY),
                    Math.max(mEndX, mStartX), Math.max(mEndY, mStartY), mRectPaint);
            canvas.drawText("  (" + Math.abs(mStartX - mEndX) + ", " + Math.abs(mStartY - mEndY) + ")",
                    Math.max(mEndX, mStartX), Math.max(mEndY, mStartY),     mTextPaint);
        }
    }
}

这将是主要方法：

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private static final String TAG = "MainActivity";
    Bitmap Imag;
    ImageView view;
    TextView text;
    int picw, pich;
    int pix[];
    int x1, x2, y1, y2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final DragRectView view2 = (DragRectView)     findViewById(R.id.dragRect);
        Imag = BitmapFactory.decodeResource(getResources(), R.drawable.rgb);
        picw = Imag.getWidth();
        pich = Imag.getHeight();
        view = (ImageView) findViewById(R.id.image);
        view.setImageBitmap(Imag);
        text = (TextView) findViewById(R.id.tex);
        pix = new int[picw * pich];

        if (null != view2) {
            view2.setOnUpCallback(new DragRectView.OnUpCallback() {
                @Override
                public void onRectFinished(final Rect rect) {
                    x1 = rect.left;
                    y1 = rect.top;
                    x2 = rect.right;
                    y2 = rect.bottom;

                    Toast.makeText(getApplicationContext(), "Coordenadas (" + x1 + ", " + y1 + ", " + x2 + ", " + y2 + ")", Toast.LENGTH_LONG).show();
                }
            });
        }
    }
}

Answer 2

来自lockdawn的回答为我工作，但我必须纠正这条线......

Math.max(mEndX, mStartX), Math.max(mEndY,     mStartX)));

我认为该行应该是：

Math.max(mEndX, mStartX), Math.max(mEndY,     mStartY)));

Answer 3

  File tempDir = Environment.getExternalStorageDirectory();
                    tempDir = new File(tempDir.getAbsolutePath() + "/.temp/");
                    tempDir.mkdir();
                    File tempFile = null;
                    try {
                        tempFile = File.createTempFile("Trendii", ".png", tempDir);

                        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
                        byte[] bitmapData = bytes.toByteArray();

                        //write the bytes in file
                        FileOutputStream fos = new FileOutputStream(tempFile);
                        fos.write(bitmapData);
                        fos.flush();
                        fos.close();


                        float height = 0, width = 0;

                        if (bitmap != null) {
                            height = bitmap.getHeight();
                            width = bitmap.getWidth();
                        }

                        Uri destination = Uri.fromFile(new File(getCacheDir(), "cropped"));
                        Crop.of(Uri.fromFile(tempFile), destination, inspirationId, height, width).asSquare().start(InspirationDetailsActivity.this);

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onPermissionDenied(PermissionDeniedResponse response) {
                    showSettingsDialog();
                }

                @Override
                public void onPermissionRationaleShouldBeShown(PermissionRequest permission, PermissionToken token) {
                    token.continuePermissionRequest();
                }
            }).check();
        } else {


            File tempDir = Environment.getExternalStorageDirectory();
            tempDir = new File(tempDir.getAbsolutePath() + "/.temp/");
            tempDir.mkdir();
            File tempFile = null;
            try {
                tempFile = File.createTempFile("Trendii", ".png", tempDir);

                ByteArrayOutputStream bytes = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
                byte[] bitmapData = bytes.toByteArray();

                //write the bytes in file
                FileOutputStream fos = new FileOutputStream(tempFile);
                fos.write(bitmapData);
                fos.flush();
                fos.close();

                float height = 0, width = 0;

                if (bitmap != null) {
                    height = bitmap.getHeight();
                    width = bitmap.getWidth();
                }

                Uri destination = Uri.fromFile(new File(getCacheDir(), "cropped"));
                Crop.of(Uri.fromFile(tempFile), destination, inspirationId, height, width).asSquare().start(this);

            } catch (IOException e) {
                e.printStackTrace();
            }

Android裁剪坐标

3 个答案: