Android实现相机拍摄选择裁剪 Android实现相机拍摄、选择、图片裁剪功能
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最近的一些学习心得:
功能实现:点击圆形头像之后可以实现相册上传或者开启相机,然后把得到的图片经过剪裁,把剪裁过的图片设置为头像的背景图
步骤:第一步:自定义一个类,继承ImageView,重写draw方法,实现外观为圆形
第二步:在xml文件中引用该控件
第三步:实现圆形头像的点击事件,点击后显示对话框界面,询问你是打开相册还是相机(自动省略显示对话框的代码)
第四步:根据用户选择情况,打开相册或者相机
第五步:将拍摄的图片或者相册选中的图片进行剪裁,将结果保存在指定内存区域
第六步:更新头像图片
具体实现:
第一步:自定义一个类,继承ImageView,重写draw方法,实现外观为圆形
//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; } }
第二步:在xml文件中引用该控件
<com.包名.MyRoundPhoto android:id="@+id/myRoundPhoto" android:layout_width="100dp" android:layout_height="100dp" > </com.包名.MyRoundPhoto>
第三步:实现圆形头像的点击事件,点击后显示对话框界面,询问你是打开相册还是相机(自动省略显示对话框的代码)
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); } }
第四步:根据用户选择情况,打开相册或者相机
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; } } }
第五步:将拍摄的图片或者相册选中的图片进行剪裁,将结果保存在指定内存区域
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; } } }
第六步:更新头像图片
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; } } }
注意:需要添加的权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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