Android拍照裁剪图片

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >
 <button
  android:id="@+id/take_photo"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="take photo" />
 <button
  android:id="@+id/get_photo"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="get photo" />
 <imageview
  android:id="@+id/picture"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal" />
</linearlayout>

import java.io.file;
import java.io.ioexception;
import android.app.activity;
import android.content.intent;
import android.graphics.bitmap;
import android.net.uri;
import android.os.bundle;
import android.os.environment;
import android.provider.mediastore;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.imageview;
public class mainactivity extends activity implements onclicklistener {
 public static final int take_photo = 1;
 public static final int crop_photo = 2;
 public static final int get_photo = 3;
 private button takephoto;
 private button getphoto;
 private imageview picture;
 private uri headimguri;
 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  takephoto = (button) findviewbyid(r.id.take_photo);
  getphoto = (button) findviewbyid(r.id.get_photo);
  picture = (imageview) findviewbyid(r.id.picture);
  takephoto.setonclicklistener(this);
  getphoto.setonclicklistener(this);
 }
 @override
 public void onclick(view v) {
  switch (v.getid()) {
  case r.id.take_photo:
   takephoto();
   break;
  case r.id.get_photo:
   getphoto();
   break;
  default:
   break;
  }
 }
 // 拍照
 private void takephoto() {
  file appdir = new file(environment.getexternalstoragedirectory(),
    "/etoury/piccache");
  if (!appdir.exists()) {
   appdir.mkdir();
  }
  string filename = "user_head" + ".jpg";
  file outputimage = new file(appdir, filename);
  try {
   if (outputimage.exists()) {
    outputimage.delete();
   }
   outputimage.createnewfile();
  } catch (ioexception e) {
   e.printstacktrace();
  }
  headimguri = uri.fromfile(outputimage);
  intent intent = new intent("android.media.action.image_capture");
  intent.putextra(mediastore.extra_output, headimguri);
  startactivityforresult(intent, take_photo);
 }
 // 定向到图片库
 private void getphoto() {
  intent intent = new intent(intent.action_pick,
    android.provider.mediastore.images.media.external_content_uri);
  startactivityforresult(intent, get_photo);
 }
 /**
  * 裁剪
  */
 private void crop(uri uri) {
  // 裁剪图片意图
  intent intent = new intent("com.android.camera.action.crop");
  intent.setdataandtype(uri, "image/*");
  // 下面这个crop=true是设置在开启的intent中设置显示的view可裁剪
  intent.putextra("crop", "true");
  intent.putextra("scale", true);// 去黑边
  // 裁剪框的比例，1：1
  intent.putextra("aspectx", 1);// 输出是x方向的比例
  intent.putextra("aspecty", 1);
  // 裁剪后输出图片的尺寸大小,不能太大500程序崩溃
  intent.putextra("outputx", 256);
  intent.putextra("outputy", 256);
  // 图片格式
  /* intent.putextra("outputformat", "jpeg"); */
  intent.putextra("outputformat", bitmap.compressformat.jpeg.tostring());
  // intent.putextra("nofacedetection", true);// 取消人脸识别
  intent.putextra("return-data", true);// true:返回uri，false：不返回uri
  // 同一个地址下 裁剪的图片覆盖拍照的图片
  intent.putextra(mediastore.extra_output, headimguri);
  startactivityforresult(intent, crop_photo);
 }
 @override
 protected void onactivityresult(int requestcode, int resultcode, intent data) {
  switch (requestcode) {
  case get_photo:
   if (resultcode == result_ok) {
    crop(data.getdata());
   }
   break;
  case take_photo:
   if (resultcode == result_ok) {
    crop(headimguri);
   }
   break;
  case crop_photo:
   if (resultcode == result_ok) {
    bitmap cropbitmap = data.getparcelableextra("data");
    picture.setimagebitmap(cropbitmap);
   }
   break;
  default:
   break;
  }
 }
}