实现调用相机并裁剪，调用相册并裁剪的功能

实现一个调用相机并裁剪，调用相册并裁剪的功能。

效果图

点击更换按钮会弹出一个对话框，选择拍照还是图库

布局文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="cn.edu.bzu.cn.myapp.MainActivity">
    <ImageView
        android:id="@+id/iv1"
        android:src="@drawable/xiaoxin"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_marginTop="100dp"
        android:layout_centerHorizontal="true"
        />
    <Button
        android:text="更换头像"
        android:layout_marginTop="30dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/iv1"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

用户交互代码

    public static final int NONE = 0;
    public static final int PHOTOHRAPH = 1;// 拍照
    public static final int PHOTOZOOM = 2; // 缩放
    public static final int PHOTORESOULT = 3;// 结果
    public static final String IMAGE_UNSPECIFIED = "image/*";
    ImageView head_image_cut;
    Bitmap photo;
    Uri u;
    File  pictureold;
    String picturePath;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_head);
        head_image_cut=(CircleImageView)findViewById(R.id.iv1);
    }

//点击事件
 public void cutPhoto(View view){
        new AlertDialog.Builder(this)
                .setTitle("选择来源")
                .setItems(new String[]{"拍照", "图库"}, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch (which) {
                            case 0://拍照，调用系统相机
                                Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                                intent2.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment.getExternalStorageDirectory(), "temp.jpg")));
                                startActivityForResult(intent2, PHOTOHRAPH);
                                break;
                            case 1://图库，调用系统图库
                                Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                                startActivityForResult(intent, PHOTOZOOM);
                                break;
                        }
                    }
                }).show();
    }

调用回调函数onActivityResult

  protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == NONE)
            return;
        // 拍照
        if (requestCode == PHOTOHRAPH) {
            //设置文件保存路径这里放在跟目录下
            pictureold = new File(Environment.getExternalStorageDirectory() + "/temp.jpg");
            startPhotoZoom(Uri.fromFile(pictureold));
        }

        if (requestCode == PHOTOZOOM && resultCode == RESULT_OK && null != data) {

            Uri selectedImage = data.getData();//获得图片的绝对路径
            String[] filePathColumn = {MediaStore.Images.Media.DATA};
            Cursor cursor = getContentResolver().query(selectedImage,
                    filePathColumn, null, null, null);
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            picturePath = cursor.getString(columnIndex);
            cursor.close();
            pictureold=new File(picturePath);
            startPhotoZoom(Uri.fromFile(pictureold));
        }
        // 处理结果
        if (requestCode == PHOTORESOULT) {
            Bundle extras = data.getExtras();
            if (extras != null) {
                photo = extras.getParcelable("data");
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);// (0 - 100)压缩文件
                head_image_cut.setImageBitmap(photo);//将图片放在ImageView
            }
        }
}

//调用系统的裁剪
public void startPhotoZoom(Uri uri) {
        Intent intent = new Intent("com.android.camera.action.CROP");
        intent.setDataAndType(uri, IMAGE_UNSPECIFIED);
        intent.putExtra("crop", "true");
        // aspectX aspectY 是宽高的比例
        intent.putExtra("aspectX", 1);
        intent.putExtra("aspectY", 1);
        // outputX outputY 是裁剪图片宽高
        intent.putExtra("outputX", 200);
        intent.putExtra("outputY", 200);
        intent.putExtra("return-data", true);
        startActivityForResult(intent, PHOTORESOULT);
    }