Android相机、图册demo

本文为大家分享了android相机、图册基本demo，供大家参考，具体内容如下

package com.example.democamera;
 
import java.io.file;
import java.io.filenotfoundexception;
import java.io.ioexception;
import android.net.uri;
import android.os.bundle;
import android.os.environment;
import android.provider.mediastore;
import android.app.activity;
import android.content.context;
import android.content.intent;
import android.content.res.configuration;
import android.database.cursor;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.view.view;
import android.widget.imageview;
 
public class mainactivity extends activity {
 
  private imageview iv;
  static final int gallery = 1, camera = 2;
 
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
 
    iv = (imageview) findviewbyid(r.id.iv_picture);
  }
 
  /**
   * 启动图片画廊
   * 
   * @param view
   */
  public void startgallery(view view) {
    intent intent = new intent();
    intent.setaction(intent.action_get_content);
    intent.settype("image/*");
    startactivityforresult(intent, gallery);
 
  }
 
  /**
   * 启动相机
   * 
   * @param view
   */
  public void startcamera(view view) {
    intent intent = new intent(mediastore.action_image_capture);
 
    if (issdexsit()) {
      /* 创建存放图片文件夹 */
      file dir = new file(environment.getexternalstoragedirectory()
          + "/my");
      if (!dir.exists())
        dir.mkdirs();
      /* 设置图片参数 得到原尺寸的图片 */
      file file = new file(dir, "aaa.jpg");
      intent.putextra(mediastore.extra_screen_orientation,
          configuration.orientation_undefined);
      intent.putextra(mediastore.extra_output, uri.fromfile(file));
    }
 
    startactivityforresult(intent, camera);
 
  }
 
  @override
  protected void onactivityresult(int requestcode, int resultcode, intent data) {
    // todo auto-generated method stub
    super.onactivityresult(requestcode, resultcode, data);
 
    switch (requestcode) {
    case gallery:
      /* 做判断，防止返回报错 */
      if (data != null) {
        /*
         * 三种方式处理uri
         */
        uri uri = data.getdata();
        iv.setimageuri(uri);
 
        bitmap bitmap = bitmapfactory
            .decodefile(getpathbyuri(uri, this));
        iv.setimagebitmap(bitmap);
 
        bitmap bitmap2 = getbitmapbyuri(uri, this);
        iv.setimagebitmap(bitmap2);
      }
 
      break;
 
    case camera:
 
      if (data != null) {// 这是获得缩略图的方法
        bitmap b = (bitmap) data.getextras().get("data");
        iv.setimagebitmap(b);
 
      } else {// 有sd卡得到图片原图
        bitmap bitmap = bitmapfactory.decodefile("sdcard/my/aaa.jpg");//直接这样做会有发生oom的风险，demo简单这么处理
        iv.setimagebitmap(bitmap);
      }
      break;
    default:
      break;
    }
 
  }
 
  /**
   * uri-->bitmap
   * 
   * @param uri
   * @param context
   * @return
   */
  public static bitmap getbitmapbyuri(uri uri, context context) {
    bitmap bitmap = null;
    try {
      bitmap = mediastore.images.media.getbitmap(
          context.getcontentresolver(), uri);
    } catch (filenotfoundexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
    } catch (ioexception e) {
      // todo auto-generated catch block
      e.printstacktrace();
    }
 
    return bitmap;
  }
 
  /**
   * uri--->path
   * 
   * @param uri
   * @param context
   * @return
   */
  public static string getpathbyuri(uri uri, context context) {
    string path = null;
 
    string[] projection = { mediastore.images.media.data };
    cursor cursor = context.getcontentresolver().query(uri, projection,
        null, null, null);
    if (cursor.movetofirst()) {
      int index = cursor
          .getcolumnindexorthrow(mediastore.images.media.data);
      path = cursor.getstring(index);
    }
    return path;
 
  }
 
  /**
   * 判断sd卡是否存在
   * 
   * @return
   */
  public static boolean issdexsit() {
    if (environment.getexternalstoragestate().equals(
        environment.media_mounted)) {
      return true;
    } else {
      return false;
    }
  }
 
}

下面分享具体android 调用相机、打开相册、裁剪图片的实现代码，内容如下

private imageview iv_user_photo;
  private string filename = "";
  private file tempfile;
  private int crop = 300;// 裁剪大小
  private static final int open_camera_code = 10;
  private static final int open_gallery_code = 11;
  private static final int crop_photo_code = 12;


  private onclicklistener popupwindowitemonclick = new onclicklistener() {

    @override
    public void onclick(view v) {
      menuwindow.dismiss();
      switch (v.getid()) {
      // 拍照
      case r.id.btn_camera:
        initfile();
        opencamera();
        break;
      // 相册
      case r.id.btn_gallery:
        initfile();
        opengallery();
        break;
      default:
        break;
      }
    }
  };

  public void initfile() {
    if(filename.equals("")) {
      if(fileutil.existsdcard()) {
        string path = environment.getexternalstoragedirectory() + file.separator + "janubookingonline" + file.separator;
        fileutil.mkdir(path);
        logger.i("path:" + path);
        filename = path + "user_head_photo.jpg";
        tempfile = new file(filename);
      } else {
        commonuitl.toast(context, "请插入sd卡");
      }
    }
  }

  /**
   * 调用相机
   */
  public void opencamera() {
    intent intent = new intent(mediastore.action_image_capture);// 打开相机
    intent.putextra("output", uri.fromfile(tempfile));
    startactivityforresult(intent, open_camera_code);
  }

  /**
   * 打开相册
   */
  public void opengallery() {
    intent intent = new intent(intent.action_pick);// 打开相册
    intent.setdataandtype(mediastore.images.media.internal_content_uri, "image/*");
    intent.putextra("output", uri.fromfile(tempfile));
    startactivityforresult(intent, open_gallery_code);
  }

  /**
   * 裁剪图片
   * @param uri
   */
  public void cropphoto(uri uri) {
    intent intent = new intent("com.android.camera.action.crop");
    intent.setdataandtype(uri, "image/*");
    intent.putextra("output", uri.fromfile(tempfile));
    intent.putextra("crop", true);
    intent.putextra("aspectx", 1);
    intent.putextra("aspecty", 1);
    intent.putextra("outputx", crop);
    intent.putextra("outputy", crop);
    startactivityforresult(intent, crop_photo_code);
  }

  @override
  protected void onactivityresult(int requestcode, int resultcode, intent data) {
    if (resultcode == 1)
      return;

    switch (requestcode) {
    case open_camera_code:
      cropphoto(uri.fromfile(tempfile));
      break;
    case open_gallery_code:
      cropphoto(data.getdata());
      break;
    case crop_photo_code:
      try {
        bitmapfactory.options options = new bitmapfactory.options();
        options.insamplesize = 2;
        bitmap bitmap = bitmapfactory.decodefile(filename, options);

        if (bitmap != null) {
          iv_user_photo.setimagebitmap(bitmap);
          commonuitl.sharedpreferences(context, appconstants.user_photo, filename);
        }
      } catch (exception e) {
        e.printstacktrace();
      }
      break;
    default:
      break;
    }

    super.onactivityresult(requestcode, resultcode, data);
  }

以上就是关于android相机、图册的基本操作内容，希望对大家学习android软件编程有所帮助。