获取手机图片或者打开相机拍照作为头像的案例

PICUtil类： /** * 删除原图 */ public class PicUtil { public void deletePic(String picPath) { if (!TextUtils.isEmpty(picPath)) { File f = new File(picPath); if (f.exists()) { f.delete(); } } } /** * 压缩图片 质量压缩法 * * @param image * @return */ public Bitmap compressImage(Bitmap image) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 int options = 100; while (baos.toByteArray().length / 1024 > 100 && options > 10) { // 循环判断如果压缩后图片是否大于100kb,大于继续压缩 baos.reset();// 重置baos即清空baos image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%，把压缩后的数据存放到baos中 options -= 10;// 每次都减少10 } ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中 Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片 return bitmap; } /** * 保存图片 * * @param photo * @param spath * @return */ public boolean saveImage(Bitmap photo, String spath) { try { BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(spath, false)); photo.compress(Bitmap.CompressFormat.JPEG, 100, bos); bos.flush(); bos.close(); } catch (Exception e) { e.printStackTrace(); return false; } return true; } public String imgToBase64(String imgPath) { ByteArrayOutputStream out = null; try { Bitmap bitmap = null; if (imgPath != null && imgPath.length() > 0) { bitmap = BitmapFactory.decodeFile(imgPath); } out = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out); out.flush(); out.close(); byte[] imgBytes = out.toByteArray(); return Base64.encodeToString(imgBytes, Base64.DEFAULT); } catch (Exception e) { e.printStackTrace(); return null; } finally { try { out.flush(); out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public String imgToBase64(Bitmap bitmap) { ByteArrayOutputStream out = null; try { out = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out); out.flush(); out.close(); byte[] imgBytes = out.toByteArray(); return Base64.encodeToString(imgBytes, Base64.DEFAULT); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); return null; } finally { try { out.flush(); out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public String getRealPathFromURI(Context mContext,Uri contentUri) { String res = null; String[] proj = { MediaStore.Images.Media.DATA }; Cursor cursor = mContext.getContentResolver().query(contentUri, proj, null, null, null); if(cursor.moveToFirst()){; int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); res = cursor.getString(column_index); } cursor.close(); return res; } MainAcvitity。Java public class MainActivity extends AppCompatActivity { private static final int REQUEST_CODE_PICK_IMAGE = 1; private static final int REQUEST_CODE_CAPTURE_CAMEIA = 0; private static final int REQUEST_CODE_CROP = 2; private ImageView iv; private AlertDialog.Builder builder; private String picPath = ""; private PicUtil picutil; private String str_base64 = ""; private boolean boolean_delete; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); picutil = new PicUtil(); iv = (ImageView) findViewById(R.id.iv); iv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { createDialog(); } }); } /** * 弹出对话框 */ public void createDialog() { builder = new AlertDialog.Builder(this); builder.setTitle("请选择"); builder.setItems(new String[]{"启动照相机", "打开手机相册", "取消选择"}, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface arg0, int arg1) { // TODO Auto-generated method stub switch (arg1) { case 0: getImageFromCamera(); break; case 1: getImageFromAlbum(); break; default: break; } } }); builder.create().show(); } /** * 从相册中获取图片 */ protected void getImageFromAlbum() { Intent intent = new Intent(Intent.ACTION_PICK); intent.setType("image/*");// 相片类型 startActivityForResult(intent, REQUEST_CODE_PICK_IMAGE); } /** * 从相机中获取图片 */ protected void getImageFromCamera() { String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) {// 如果挂载成功。 Intent getImageByCamera = new Intent("android.media.action.IMAGE_CAPTURE"); // 图片路径？照相后图片要存储的位置 picPath = getPicName(); // 指定输出路径 getImageByCamera.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(picPath))); getImageByCamera.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1); startActivityForResult(getImageByCamera, REQUEST_CODE_CAPTURE_CAMEIA); } else { Toast.makeText(getApplicationContext(), "请确认已经插入SD卡", Toast.LENGTH_LONG).show(); } } /** * 裁剪 * * @param */ protected void cropPic(File file) { if (!file.exists()) { Toast.makeText(getApplicationContext(), "图片不存在", Toast.LENGTH_LONG).show(); return; } Intent intent = new Intent(); intent.setAction("com.android.camera.action.CROP"); intent.setDataAndType(Uri.fromFile(file), "image/*");// mUri是已经选择的图片Uri intent.putExtra("crop", "true"); intent.putExtra("aspectX", 1);// 裁剪框比例 intent.putExtra("aspectY", 1); intent.putExtra("outputX", 150);// 输出图片大小 intent.putExtra("outputY", 150); intent.putExtra("return-data", true); startActivityForResult(intent, REQUEST_CODE_CROP); } protected void cropPic(Uri uri) { Intent intent = new Intent(); intent.setAction("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*");// mUri是已经选择的图片Uri intent.putExtra("crop", "true"); intent.putExtra("aspectX", 1);// 裁剪框比例 intent.putExtra("aspectY", 1); intent.putExtra("outputX", 150);// 输出图片大小 intent.putExtra("outputY", 150); intent.putExtra("return-data", true); startActivityForResult(intent, REQUEST_CODE_CROP); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode != RESULT_OK) { Toast.makeText(this, "操作失败", Toast.LENGTH_SHORT).show(); return; } // 判断请求码 switch (requestCode) { case REQUEST_CODE_PICK_IMAGE:// 从相册中获取数据后返回 boolean_delete = false; Uri uri = data.getData(); // 进行裁剪 cropPic(uri); break; case REQUEST_CODE_CAPTURE_CAMEIA:// 从相机中获取后返回 boolean_delete = true; cropPic(new File(picPath)); break; case REQUEST_CODE_CROP:// 裁剪完成后的返回 if (boolean_delete) { picutil.deletePic(picPath);// 裁剪完成后删除原图 } // 拿到剪切数据 Bitmap bmap = data.getParcelableExtra("data");// 裁剪过后的bitmap // 压缩 Bitmap newBmap = picutil.compressImage(bmap); // 展示到了图片上 iv.setImageBitmap(newBmap); //如果要上传 bitmap转为二进制流上传，也可以直接保存成为一个file进行上传。 break; default: break; } } // 得到图片名称 public String getPicName() { if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { Date date = new Date(); return Environment.getExternalStorageDirectory().toString() + "/" + date.getTime() + ".jpg"; } return null; }