Android实现拍照、选择相册图片并裁剪功能

通过拍照或相册中获取图片，并进行裁剪操作，然后把图片显示到imageview上。
 当然也可以上传到服务器（项目中绝大部分情况是上传到服务器），参考网上资料及结合项目实际情况，
 测试了多款手机暂时没有发现严重问题。代码有注释，直接贴代码：

public class uploadpicactivity extends activity implements view.onclicklistener {
 private button take_photo_btn;
 private button select_photo_btn;
 private imageview photo_iv;
 //使用照相机拍照获取图片
 public static final int take_photo_code = 1;
 //使用相册中的图片
 public static final int select_pic_code = 2;
 //图片裁剪
 private static final int photo_crop_code = 3;
 //定义图片的uri
 private uri photouri;
 //图片文件路径
 private string picpath;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_upload_pic);
  initviews();
 }

 private void initviews() {
  this.take_photo_btn = (button) findviewbyid(r.id.take_photo_btn);
  this.take_photo_btn.setonclicklistener(this);
  this.select_photo_btn = (button) findviewbyid(r.id.select_photo_btn);
  this.select_photo_btn.setonclicklistener(this);
  this.photo_iv = (imageview) findviewbyid(r.id.photo_iv);
 }

 @override
 public void onclick(view view) {
  switch (view.getid()) {
   //拍照
   case r.id.take_photo_btn:
    pictytakephoto();
    break;
   //选择图库
   case r.id.select_photo_btn:
    pickphoto();
    break;
  }
 }

 /**
  * 拍照获取图片
  */
 private void pictytakephoto() {
  //判断sd卡是否存在
  string sdstate = environment.getexternalstoragestate();
  if (sdstate.equals(environment.media_mounted)) {
   intent intent = new intent(mediastore.action_image_capture);//"android.media.action.image_capture"
/***
 * 使用照相机拍照，拍照后的图片会存放在相册中。使用这种方式好处就是：获取的图片是拍照后的原图，
 * 如果不实用contentvalues存放照片路径的话，拍照后获取的图片为缩略图有可能不清晰
 */
   contentvalues values = new contentvalues();
   photouri = getcontentresolver().insert(mediastore.images.media.external_content_uri, values);
   intent.putextra(android.provider.mediastore.extra_output, photouri);
   startactivityforresult(intent, take_photo_code);
  } else {
   toast.maketext(this, "内存卡不存在", toast.length_long).show();
  }
 }

 /***
  * 从相册中取图片
  */
 private void pickphoto() {
  intent intent = new intent(intent.action_pick, null);
  intent.setdataandtype(mediastore.images.media.external_content_uri,
    "image/*");
  startactivityforresult(intent, select_pic_code);
 }

 @override
 public void onactivityresult(int requestcode, int resultcode, intent data) {
  super.onactivityresult(requestcode, resultcode, data);
  if (resultcode == activity.result_ok) {
   //从相册取图片，有些手机有异常情况，请注意
   if (requestcode == select_pic_code) {
    if (null != data && null != data.getdata()) {
     photouri = data.getdata();
     picpath = uritofilepath(photouri);
     startphotozoom(photouri, photo_crop_code);
    } else {
     toast.maketext(this, "图片选择失败", toast.length_long).show();
    }
   } else if (requestcode == take_photo_code) {
    string[] pojo = {mediastore.images.media.data};
    cursor cursor = managedquery(photouri, pojo, null, null, null);
    if (cursor != null) {
     int columnindex = cursor.getcolumnindexorthrow(pojo[0]);
     cursor.movetofirst();
     picpath = cursor.getstring(columnindex);
     if (build.version.sdk_int < 14) {
      cursor.close();
     }
    }
    if (picpath != null) {
     photouri = uri.fromfile(new file(picpath));
     startphotozoom(photouri, photo_crop_code);
    } else {
     toast.maketext(this, "图片选择失败", toast.length_long).show();
    }
   } else if (requestcode == photo_crop_code) {
    if (photouri != null) {
     bitmap bitmap = bitmapfactory.decodefile(picpath);
     if (bitmap != null) {
      //这里可以把图片进行上传到服务器操作
      photo_iv.setimagebitmap(bitmap);
     }
    }
   }
  }
 }

 /**
  * @param
  * @description 裁剪图片
  * @author ldm
  * @time 2016/11/30 15:19
  */
 private void startphotozoom(uri uri, int reque_code_crop) {
  intent intent = new intent("com.android.camera.action.crop");
  intent.setdataandtype(uri, "image/*");
  // crop=true是设置在开启的intent中设置显示的view可裁剪
  intent.putextra("crop", "true");
  // 去黑边
  intent.putextra("scale", true);
  intent.putextra("scaleupifneeded", true);
  // aspectx aspecty 是宽高的比例，根据自己情况修改
  intent.putextra("aspectx", 3);
  intent.putextra("aspecty", 2);
  // outputx outputy 是裁剪图片宽高像素
  intent.putextra("outputx", 600);
  intent.putextra("outputy", 400);
  intent.putextra("outputformat", bitmap.compressformat.jpeg.tostring());
  //取消人脸识别功能
  intent.putextra("nofacedetection", true);
  //设置返回的uri
  intent.putextra(mediastore.extra_output, uri);
  //设置为不返回数据
  intent.putextra("return-data", false);
  startactivityforresult(intent, reque_code_crop);
 }

 /**
  * @param
  * @description 把uri转换为文件路径
  * @author ldm
  * @time 2016/11/30 15:22
  */
 private string uritofilepath(uri uri) {
  //获取图片数据
  string[] proj = {mediastore.images.media.data};
  //查询
  cursor cursor = managedquery(uri, proj, null, null, null);
  //获得用户选择的图片的索引值
  int image_index = cursor.getcolumnindexorthrow(mediastore.images.media.data);
  cursor.movetofirst();
  //返回图片路径
  return cursor.getstring(image_index);
 }
}

布局文件长这样：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

 <button
  android:id="@+id/take_photo_btn"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_margintop="20dp"
  android:gravity="center"
  android:text="拍照"
  android:textsize="16sp"/>

 <button
  android:id="@+id/select_photo_btn"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_margintop="20dp"
  android:gravity="center"
  android:text="选择图片"
  android:textsize="16sp"/>

 <imageview
  android:id="@+id/photo_iv"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:layout_margintop="20dp"/>
</linearlayout>

最后不要忘记在androidmanifest.xml中添加uploadpicactivity及权限：

<uses-permission android:name="android.permission.camera"/>
<uses-permission android:name="android.permission.write_external_storage"/>
<uses-permission 
 android:name="android.permission.mount_unmount_filesystems"/>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。