Android实现相机拍摄、选择、图片裁剪功能

//圆形头像类
public class MyRoundPhoto extends ImageView{

 private Paint p;
 private Bitmap bitmap;
 private Context context;
 private int wAndHeight[]=new int[2];
 private File file;
 
 public MyRoundPhoto(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 // TODO Auto-generated constructor stub
 
 //获得控件长宽(px)
 wAndHeight = getWidthAndHeight(context,attrs);
 
 this.cOntext= context;
 
    //初始化控件
    init();
 
 

 }

 public MyRoundPhoto(Context context) {
 super(context);
 // TODO Auto-generated constructor stub

    //获得控件长宽（px）
 wAndHeight=getWidthAndHeight(context,attrs);
 
 this.cOntext= context;
 init();
 }

 public MyRoundPhoto(Context context, AttributeSet attrs) {
 super(context, attrs);
 
 //获得控件长宽（px）
 wAndHeight=getWidthAndHeight(context,attrs);
 
 // TODO Auto-generated constructor stub
 this.cOntext= context;
 init();
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
 // TODO Auto-generated method stub
 super.onDraw(canvas);
 canvas.drawBitmap(bitmap, new Matrix(), p);
 
 }
 
 private void init(){
 //从手机存储区域获取图片文件（该位置为手机相册选中的图片经过剪裁后的图片的存储路径）
 file = new File(Environment.getExternalStorageDirectory(),Info.PHOTO_NAME);
 
    //如果图片文件存在，则显示，否则则创建并显示
 if(file.exists()){
  Log.v("文件存在", "是");
  this.bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
 }
 else{
  Log.v("文件不存在", "是");
  
  //生成默认图片的文件
  this.bitmap=BitmapFactory.decodeStream(context.getResources().openRawResource(R.drawable.defalut));
  //person.setPicture()
  FileOutputStream fos=null;
  try {
  fos = new FileOutputStream(file);
  } catch (FileNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); //压缩
  try {
  fos.flush();
  fos.close();
  } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  
 }
 
 //将方形的位图转换为圆形的位图
 this.bitmap = toRoundBitmap(this.bitmap);
 p = new Paint();
  
 }
 
 private Bitmap toRoundBitmap(Bitmap map){
 
 
 //int height = map.getHeight()+100;
 int height=convertDIP2PX(context,this.wAndHeight[1]); //位图的高度(px)
 int width = convertDIP2PX(context,this.wAndHeight[0]);//位图的宽度（px）
 
 //创建画布
 Bitmap bit = Bitmap.createBitmap(width, height, Config.ARGB_8888);
 Canvas canvas = new Canvas(bit);
 
 //画笔
 Paint paint = new Paint();
 paint.setAntiAlias(false);
 int r = (width>height)&＃63;height:width;
 
 
 
 //绘制圆形
 RectF rectF = new RectF(0,0,r,r);
 canvas.drawRoundRect(rectF, r/2, r/2, paint);
 
 //画头像
 //canvas.drawARGB(0, 0, 0, 0);
 paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
 canvas.drawBitmap(map, null,rectF, paint);
 
 //返回圆形位图
 return bit;
 }
 
  //使当前视图无效，从而使系统重新绘制视图
 public void myValidate(){
 bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
 bitmap=toRoundBitmap(bitmap);
 invalidate();
 
 }
 
  //将dp转换为px
 private static int convertDIP2PX(Context context, int dip) { 
   float scale = context.getResources().getDisplayMetrics().density; 
   return (int)(dip*scale + 0.5f*(dip>=0&＃63;1:-1)); 
 } 
 
 //根据xml文件中的属性，返回宽高（px）
  private static int[] getWidthAndHeight(Context context,AttributeSet attrs){
 int height,width;
 int n = attrs.getAttributeCount();
 int wAndH[] = new int[2];
 
 
 for(int i=0;i='0'&&sttr.charAt(j)<='9'){
   temp+=sttr.charAt(j);
   j++;
  }
  wAndH[0]=Integer.parseInt(temp);
  temp="";
  continue;
  }
  
  //获取长度
  if(str.equals("layout_height")){
  //System.out.println(attrs.getAttributeName(1));
  String sttr = attrs.getAttributeValue(i);
  String temp = "";
  int j=0;
  while(sttr.charAt(j)>='0'&&sttr.charAt(j)<='9'){
   temp+=sttr.charAt(j);
   j++;
  }
  //System.out.println("temp"+temp);
  wAndH[1]=Integer.parseInt(temp);
  temp="";
  continue;
  }
 }
 return wAndH;
 } 
}

public void onClick(View v) {
 // TODO Auto-generated method stub
 
 //点击头像
 if(v.getId()==R.id.myRoundPhoto){
  //打开DialogActivity,询问打开照相机还是相册
  Intent intent = new Intent(GuideActivity.this,DialogActivity.class);
  startActivityForResult(intent, Info.PICK_PHOTO);
 }
 }

 image =new File(Environment.getExternalStorageDirectory(),Info.PHOTO_NAME);

  public void onClick(View v) {
 // TODO Auto-generated method stub
 switch(v.getId()){
 
 //打开相机
 case R.id.imageButton1:{
  Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
  intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(image));
  startActivityForResult(intent, Info.OPEN_CAMERA); 
  break;
 }
 
 //打开相册
 case R.id.imageButton2:{
  Intent intent = new Intent(Intent.ACTION_PICK);
  intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(image));
  intent.setType("image/*");
  startActivityForResult(intent, Info.OPEN_GALLERY);
  break;
 }
 }
 }

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 // TODO Auto-generated method stub
 super.onActivityResult(requestCode, resultCode, data);
 
 switch(requestCode){
 //打开相机 
 case Info.OPEN_CAMERA:{
  if(resultCode==RESULT_OK){
  
  //启动裁剪activity
  Log.v("启动剪裁程序", "是的");
  Intent intent1 = new Intent("com.android.camera.action.CROP");
       intent1.setDataAndType(Uri.fromFile(image), "image/*");
       intent1.putExtra("crop", "true");
       intent1.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(image));//
       intent1.putExtra("aspectX", 1);
       intent1.putExtra("aspectY", 1);
       intent1.putExtra("outputFormat", Bitmap.CompressFormat.JPEG);
       intent1.putExtra("outputX", 720);
       intent1.putExtra("outputY", 720);
       intent1.putExtra("return-data", false);
       startActivityForResult(intent1, Info.CROP_PHOTO);
  }
  break;
 }
 
 //打开相册
 case Info.OPEN_GALLERY:{
  
  if(resultCode==RESULT_OK){ 
  //启动剪裁程序
  Log.v("启动剪裁程序", "是的");
  Intent intent1 = new Intent("com.android.camera.action.CROP");
       intent1.setDataAndType(Uri.fromFile(image), "image/*");
       intent1.putExtra("crop", "true");
       intent1.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(image));//
       intent1.putExtra("aspectX", 1);
       intent1.putExtra("aspectY", 1);
       intent1.putExtra("outputFormat", Bitmap.CompressFormat.JPEG);
       intent1.putExtra("outputX", 720);
       intent1.putExtra("outputY", 720);
       intent1.putExtra("return-data", false);
       startActivityForResult(intent1, Info.CROP_PHOTO);
  } 
  break;
 }
 
 //裁剪图片
 case Info.CROP_PHOTO:{
  Intent intent=new Intent();
  setResult(this.RESULT_OK, intent);
  finish();
  break;
 }
 }
 }

   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 // TODO Auto-generated method stub
 super.onActivityResult(requestCode, resultCode, data);
 
 switch(requestCode){
 //选择头像
 case Info.PICK_PHOTO:{
  //如果摄取图片成功
  if(resultCode==RESULT_OK){
  Log.v("requstCodeGuideOne", "PICK_PHOTO");
  btn_choosePhoto.myValidate(); //使原有视图无效，从而使系统重新绘制视图
  }
  break;
 }
 
 default:{
  break;
 }
 }
 }