Android开发：用getDrawingCache方法获取ImageView中的图(2)

b.     当touch down OK按钮btn_photo时(用来模拟保存数据的动作)，再次从iv_photo中获取图像，然后和a中获得的图像进行比较，并进行进一步的处理。

 

4.     Compare2Images的代码如下：

        package com.waveline.compare2images;

        import java.io.File;

        import java.io.FileNotFoundException;

        import java.io.FileOutputStream;

        import java.io.IOException;

        import android.app.Activity;

        import android.content.Intent;

        import android.graphics.Bitmap;

        import android.graphics.Bitmap.CompressFormat;

        import android.os.Bundle;

        import android.os.Environment;

        import android.view.MotionEvent;

        import android.view.View;

        import android.view.View.OnTouchListener;

        import android.widget.Button;

        import android.widget.ImageView;

        import android.widget.Toast;

        import android.widget.ImageView.ScaleType;

 

        public class Compare2Images extends Activity

        implements

        OnTouchListener

        {

                private Bitmap obmp;

                private ImageView iv_photo;

                private Button btn_photo;

                @Override

                public void onCreate(BundlesavedInstanceState)

                {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.main);

       

                        iv_photo =(ImageView)findViewById(R.id.iv_photo);

                        iv_photo.setOnTouchListener(this);

 

                        btn_photo = (Button)findViewById(R.id.btn_photo);

                        btn_photo.setOnTouchListener(this);

               }

 

                public boolean onTouch(View v, MotionEventevent)

                {

                        switch(v.getId())

                        {

                        case R.id.iv_photo: