Android Studio更换图片：选择照片或拍照相关代码

弹出信息提示框代码

 AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("选择图片");
                builder.setMessage("可以通过相册和照相来修改默认图片！");
                builder.setPositiveButton("图库", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        tempFile = new File(Environment.getExternalStorageDirectory(), PHOTO_FILE_NAME);
                        gallery();
                    }
                });
                builder.setNegativeButton("拍照", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        tempFile = new File(Environment.getExternalStorageDirectory(), PHOTO_FILE_NAME);
                        camera();
                    }
                });
                builder.create();//创建
                builder.show();//显示

从相册中选择照片代码：

 /**
     * 从相册获取
     */
    public void gallery() {
        Intent intent=new Intent(Intent.ACTION_GET_CONTENT);//ACTION_OPEN_DOCUMENT
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("image/jpeg");
        if(android.os.Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.KITKAT){
            startActivityForResult(intent, PHOTO_REQUEST_GALLERY);
        }else{
            startActivityForResult(intent, PHOTO_REQUEST_GALLERY2);
        }
    }

从相机中获取

 /**
     * 从相机获取
     */
    public void camera() {
        Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
        // 判断存储卡是否可以用，可用进行存储
        if (hasSdcard()) {
            intent.putExtra(MediaStore.EXTRA_OUTPUT,
                    Uri.fromFile(new File(Environment.getExternalStorageDirectory(), PHOTO_FILE_NAME)));
        }
        startActivityForResult(intent, PHOTO_REQUEST_CAMERA);
    }

//判断存储卡是否可用

 /**
     * 判断SD卡是否可用
     *
     * @return
     */
    private boolean hasSdcard() {
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            return true;
        } else {
            return false;
        }
    }

//通过返回值来设置照片

 /**
     * 通过返回的值来设置图片
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == PHOTO_REQUEST_GALLERY2) {
            if (data != null) {
                // 得到图片的全路径
                String path = GetPictureFromLocation.selectImage(getApplicationContext(),data);
                crop(Uri.parse("file://"+path));//调用剪贴图片代码
            }

        }  else if (requestCode == PHOTO_REQUEST_GALLERY) {
            if (data != null) {
                // 得到图片的全路径
                String path = GetPictureFromLocation.getPath(getApplicationContext(), data.getData());
                crop(Uri.parse("file://"+path));//调用剪贴图片代码
            }

        }else if (requestCode == PHOTO_REQUEST_CAMERA) {
            crop(Uri.fromFile(tempFile)); //调用剪贴图片代码
        }else if (requestCode == PHOTO_REQUEST_CUT) {
            try {
                Bitmap bitmap = BitmapFactory.decodeFile(tempFile.getPath());
                Log.e("uri", Uri.fromFile(tempFile).toString());
                head_image.setImageBitmap(bitmap);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }

//剪贴图片源码：

 /**
     * 剪切图片
     *
     * @function:
     * @author:Jerry
     * @date:2013-12-30
     * @param uri
     */
    private void crop(Uri uri) {
        Log.e("URI", uri.getPath());
        Log.e("URI", uri.toString());
        // 裁剪图片意图
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, "image/*");
		intent.putExtra("crop", "true");
		// 裁剪框的比例，1：1
		intent.putExtra("aspectX", 1);
		intent.putExtra("aspectY", 1);
		// 裁剪后输出图片的尺寸大小
		intent.putExtra("outputX", 150);
		intent.putExtra("outputY", 150);
        intent.putExtra("scale", true);//黑边
        intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(tempFile));
		// 图片格式
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
        intent.putExtra("noFaceDetection", true);// 取消人脸识别
        intent.putExtra("return-data", true);// true:不返回uri，false：返回uri
        startActivityForResult(intent, PHOTO_REQUEST_CUT);
    }