How To Drag and Rotate Image Using TouchEvent in Android

here i used two imageviews, one is for Rotation another one is for Drag

classes :

=====

main.xml

Tangram11.java

main.xnml

----------------

android:orientation="vertical" android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:layout_height="wrap_content" android:text=" Image Rotating "

android:id="@+id/xTv1" />

android:layout_height="200sp" android:src="@drawable/icon"

android:layout_marginTop="50sp" android:layout_marginLeft="50sp"

android:layout_below="@+id/xTv1" />

android:layout_height="200sp" android:src="@drawable/rotate"

android:layout_below="@+id/xTv1" android:visibility="invisible"

android:layout_marginTop="50sp" android:layout_marginLeft="50sp" />

Tangram11.java

--------------------

package sra.tan;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Matrix;

import android.graphics.drawable.BitmapDrawable;

import android.os.Bundle;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.widget.ImageView;

import android.widget.RelativeLayout.LayoutParams;

public class TanGram11 extends Activity implements OnTouchListener {

private ImageView mMainImg, mRotateImg;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

// setting main view for Activity

setContentView(R.layout.main);

mMainImg = (ImageView) findViewById(R.id.xIvimg);

mRotateImg = (ImageView) findViewById(R.id.xIvRoller);

// mRotateImg.setOnTouchListener(this);

mMainImg.setOnTouchListener(this);

}

private int r = 0;

@Override

public boolean onTouch(View v, MotionEvent event) {

int eId = event.getAction();

mRotateImg.setVisibility(ImageView.VISIBLE);

if (v == mMainImg) {

switch (eId) {

case MotionEvent.ACTION_MOVE:

drag(v, event);

break;

case MotionEvent.ACTION_UP:

mRotateImg.setOnTouchListener(this);

break;

default:

}

}

if (v == mRotateImg) {

switch (eId) {

case MotionEvent.ACTION_MOVE:

r = r + 2;

rotate(v, event);

break;

case MotionEvent.ACTION_UP:

mRotateImg.setVisibility(ImageView.INVISIBLE);

break;

default:

}

if (v != mMainImg && v != mRotateImg)

mRotateImg.setVisibility(ImageView.INVISIBLE);

}

return true;

}

private void rotate(View v, MotionEvent event) {

Bitmap bitmap = BitmapFactory.decodeResource(getResources(),

R.drawable.icon);

int w = bitmap.getWidth();

int h = bitmap.getHeight();

Matrix matrix = new Matrix();

matrix.preRotate(-r);

Bitmap rotaBitmap = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix,

true);

BitmapDrawable bdr = new BitmapDrawable(rotaBitmap);

mMainImg.setImageDrawable(bdr);

}

private void drag(View v, MotionEvent event) {

LayoutParams mParams = (LayoutParams) mMainImg.getLayoutParams();

int x = (int) event.getRawX();

int y = (int) event.getRawY();

mParams.leftMargin = x - 150;

mParams.topMargin = y - 210;

mMainImg.setLayoutParams(mParams);

mRotateImg.setLayoutParams(mParams);

}

}

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