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)?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?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<n;i++){  String str = attrs.getAttributeName(i);    //获取宽度  if(str.equals("layout_width")){    //System.out.println(attrs.getAttributeName(0));  String sttr = attrs.getAttributeValue(i);  String temp = "";  int j=0;  while(sttr.charAt(j)>='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; } }

 <com.包名.MyRoundPhoto      android:id="@+id/myRoundPhoto"        android:layout_width="100dp"        android:layout_height="100dp" >              </com.包名.MyRoundPhoto>

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; } } }

<uses-permission     android:name="android.permission.READ_EXTERNAL_STORAGE"     /> <uses-permission   android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>