图片的几种处理方式

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import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.InputEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.os.Build;

public class MainActivity extends Activity implements OnClickListener{

   Button btnReset, btnScale, btnRotate, btnSkew, btnCut;

   ImageView iv1;

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

       init();

   }

   private void init() {
       btnReset = (Button)findViewById(R.id.btn_reset_main);
       btnReset.setOnClickListener(this);

       btnScale = (Button)findViewById(R.id.btn_scale_main);
       btnScale.setOnClickListener(this);

       btnRotate = (Button)findViewById(R.id.btn_rotate_main);
       btnRotate.setOnClickListener(this);

       btnSkew = (Button)findViewById(R.id.btn_skew_main);
       btnSkew.setOnClickListener(this);

       btnCut = (Button)findViewById(R.id.btn_cut_main);
       btnCut.setOnClickListener(this);

       iv1 = (ImageView)findViewById(R.id.iv_1_main);
   }

   @Override
   public void onClick(View v) {
       // TODO Auto-generated method stub
       switch(v.getId()) {
       case R.id.btn_reset_main:
           //重置
           Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

           Log.i("FSLog", "size = " + bmp.getByteCount());

           iv1.setImageBitmap(bmp);

           break;
       case R.id.btn_rotate_main:
           //旋转
           Bitmap bmp2 = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

           Matrix m2 = new Matrix();
           m2.setRotate(45);

           Bitmap res2 = Bitmap.createBitmap(bmp2,
                   0, 0,
                   bmp2.getWidth(), bmp2.getHeight(),
                   m2, true);

           iv1.setImageBitmap(res2);

           break;
       case R.id.btn_scale_main:

           //将Bitmap进行缩放
           //1. 创建Matrix对象，用来描述变形的规则
           //2. 调用Bitmap的静态方法createBitmap

           //参数1：需要变换的原图
           //参数2,3:如果需要裁剪，从哪个像素开始裁剪
           //参数4,5:如果要裁剪，裁剪的宽高
           //参数6：Matrix对象，表示要将原图按照那种方式来变形
           //参数7：如果Matrix设置了除translationg之外的其他变化，就需要设置为true
           Bitmap bmp1 = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

           Matrix m1 = new Matrix();
           m1.setScale(0.5f, 0.5f);

           Bitmap res1 = Bitmap.createBitmap(bmp1,
                   0, 0,
                   bmp1.getWidth(), bmp1.getHeight(),
                   m1, true);

           Log.i("FSLog", "size = " + res1.getByteCount());

           iv1.setImageBitmap(res1);

           break;
       case R.id.btn_skew_main:
           //扭曲
           Bitmap bmp3 = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

           Matrix m3 = new Matrix();
           m3.setSkew(0.5f, 0.5f);

           Bitmap res3 = Bitmap.createBitmap(bmp3,
                   0, 0,
                   bmp3.getWidth(), bmp3.getHeight(),
                   m3, false);

           iv1.setImageBitmap(res3);

           break;
       case R.id.btn_cut_main:
           //裁剪
           Bitmap bmp4 = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
           Bitmap res4 = Bitmap.createBitmap(bmp4,
                   10, 10,
                   20, 20,
                   null, true);

           iv1.setImageBitmap(res4);


           break;
           default:
               break;
       }
   }

}

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