Android Freehand image crop

Hi Coders,
I am going to explore a sample application in android ,which gives you
an idea how to crop it according our selection (marking) image like Photoshop lasso tool crop...
Hope this will helps you......

  

Create a Project with Android Studio

Create CropView.java and paste it below code

package com.app.mydemos;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

public class CropView extends View implements View.OnTouchListener {
    private Paint paint;
    public static List<Point> points;
    int DIST = 2;
    boolean flgPathDraw = true;

    Point mfirstpoint = null;
    boolean bfirstpoint = false;

    Point mlastpoint = null;

    Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
            R.drawable.pk);
    Context mContext;

    public CropView(Context c) {
        super(c);

        mContext = c;
        setFocusable(true);
        setFocusableInTouchMode(true);

        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setStyle(Paint.Style.STROKE);
        paint.setPathEffect(new DashPathEffect(new float[] { 10, 20 }, 0));
        paint.setStrokeWidth(5);
        paint.setColor(Color.WHITE);

        this.setOnTouchListener(this);
        points = new ArrayList<Point>();

        bfirstpoint = false;
    }

    public CropView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        setFocusable(true);
        setFocusableInTouchMode(true);

        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeWidth(2);
        paint.setColor(Color.WHITE);

        this.setOnTouchListener(this);
        points = new ArrayList<Point>();
        bfirstpoint = false;

    }

    public void onDraw(Canvas canvas) {
        canvas.drawBitmap(bitmap, 0, 0, null);

        Path path = new Path();
        boolean first = true;

        for (int i = 0; i < points.size(); i += 2) {
            Point point = points.get(i);
            if (first) {
                first = false;
                path.moveTo(point.x, point.y);
            } else if (i < points.size() - 1) {
                Point next = points.get(i + 1);
                path.quadTo(point.x, point.y, next.x, next.y);
            } else {
                mlastpoint = points.get(i);
                path.lineTo(point.x, point.y);
            }
        }
        canvas.drawPath(path, paint);
    }

    public boolean onTouch(View view, MotionEvent event) {

        Point point = new Point();
        point.x = (int) event.getX();
        point.y = (int) event.getY();

        if (flgPathDraw) {

            if (bfirstpoint) {

                if (comparepoint(mfirstpoint, point)) {
                    points.add(mfirstpoint);
                    flgPathDraw = false;
                    showcropdialog();
                } else {
                    points.add(point);
                }
            } else {
                points.add(point);
            }

            if (!(bfirstpoint)) {

                mfirstpoint = point;
                bfirstpoint = true;
            }
        }

        invalidate();
        
        if (event.getAction() == MotionEvent.ACTION_UP) {
      
            mlastpoint = point;
            if (flgPathDraw) {
                if (points.size() > 12) {
                    if (!comparepoint(mfirstpoint, mlastpoint)) {
                        flgPathDraw = false;
                        points.add(mfirstpoint);
                        showcropdialog();
                    }
                }
            }
        }

        return true;
    }

    private boolean comparepoint(Point first, Point current) {
        int left_range_x = (int) (current.x - 3);
        int left_range_y = (int) (current.y - 3);

        int right_range_x = (int) (current.x + 3);
        int right_range_y = (int) (current.y + 3);

        if ((left_range_x < first.x && first.x < right_range_x)
                && (left_range_y < first.y && first.y < right_range_y)) {
            if (points.size() < 10) {
                return false;
            } else {
                return true;
            }
        } else {
            return false;
        }

    }

    private void showcropdialog() {
        DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
            @Override            public void onClick(DialogInterface dialog, int which) {
                Intent intent;
                switch (which) {
                    case DialogInterface.BUTTON_POSITIVE:

                        intent = new Intent(mContext, ImageCropActivity.class);
                        intent.putExtra("crop", true);
                        mContext.startActivity(intent);
                        break;

                    case DialogInterface.BUTTON_NEGATIVE:

                        intent = new Intent(mContext, ImageCropActivity.class);
                        intent.putExtra("crop", false);
                        mContext.startActivity(intent);

                        bfirstpoint = false;

                        break;
                }
            }
        };

        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
        builder.setMessage("Do you Want to save Crop or Non-crop image?")
                .setPositiveButton("Crop", dialogClickListener)
                .setNegativeButton("Non-crop", dialogClickListener).show()
                .setCancelable(false);
    }
}

Create image_crop_activity.xml file and paste it below code.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

 <ImageView

android:id="@+id/iv"

android:layout_width="wrap_content" 

android:layout_height="wrap_content" />

</LinearLayout>

Create ImageCropActivity.java and past it below code.

package com.app.mydemos;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.widget.ImageView;

public class ImageCropActivity extends Activity {
    ImageView compositeImageView;
    boolean crop;

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

        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            crop = extras.getBoolean("crop");
        }
        int widthOfscreen = 0;
        int heightOfScreen = 0;

        DisplayMetrics dm = new DisplayMetrics();
        try {
            getWindowManager().getDefaultDisplay().getMetrics(dm);
        } catch (Exception ex) {
        }
        widthOfscreen = dm.widthPixels;
        heightOfScreen = dm.heightPixels;

        compositeImageView = (ImageView) findViewById(R.id.iv);

        Bitmap bitmap2 = BitmapFactory.decodeResource(getResources(),
                R.drawable.pk);

        Bitmap resultingImage = Bitmap.createBitmap(widthOfscreen,
                heightOfScreen, bitmap2.getConfig());

        Canvas canvas = new Canvas(resultingImage);
        Paint paint = new Paint();
        paint.setAntiAlias(true);

        Path path = new Path();
        for (int i = 0; i < CropView.points.size(); i++) {
            path.lineTo(CropView.points.get(i).x, CropView.points.get(i).y);
        }
        canvas.drawPath(path, paint);
        if (crop) {
            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));

        } else {
            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));
        }
        canvas.drawBitmap(bitmap2, 0, 0, paint);
        compositeImageView.setImageBitmap(resultingImage);
    }
}

Create Point.java class and past it below code.

package com.app.mydemos;

public class Point {

    public float dy;

    public float dx;
    float x, y;

    @Override    public String toString() {
        return x + ", " + y;
    }
}

Create MainActivty.java class and paste it below code

package com.app.mydemos;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Override    protected void onResume() {
        super.onResume();
        setContentView(new CropView(MainActivity.this));
    }

}

Open your AndroidManifest.xml file and paste it below code.

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    

package="com.app.mydemos" >

<application        

android:allowBackup="true"        

android:icon="@mipmap/ic_launcher"        

android:label="@string/app_name"        

android:theme="@style/AppTheme" >

<activity            

 android:name=".MainActivity"            

 android:label="@string/app_name" >

   <intent-filter>
     <action android:name="android.intent.action.MAIN" />
      <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>

 </activity>

 <activity android:name=".ImageCropActivity"/>

 </application>

</manifest>