Android调用手机拍照功能的方法

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent">
 <imageview android:id="@+id/imageview"
  android:adjustviewbounds="true"
  android:layout_gravity="center"
  android:minwidth="150dip"
  android:minheight="150dip"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"/>
 <button android:id="@+id/btnphone"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="相册" />
 <button android:id="@+id/btntakepicture"
  android:layout_height="wrap_content"
  android:layout_width="fill_parent"
  android:text="拍照" />
</linearlayout>

package com.ljq.test;
import java.io.bytearrayoutputstream;
import java.io.file;
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.widget.button;
import android.widget.imageview;
public class testactivity extends activity {
 private static final int none = 0;
 private static final int photo_graph = 1;// 拍照
 private static final int photo_zoom = 2; // 缩放
 private static final int photo_resoult = 3;// 结果
 private static final string image_unspecified = "image/*";
 private imageview imageview = null;
 private button btnphone = null;
 private button btntakepicture = null;
 @override
 public void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.main);
  imageview = (imageview) findviewbyid(r.id.imageview);
  btnphone = (button) findviewbyid(r.id.btnphone);
  btnphone.setonclicklistener(onclicklistener);
  btntakepicture = (button) findviewbyid(r.id.btntakepicture);
  btntakepicture.setonclicklistener(onclicklistener);
 }
 private final view.onclicklistener onclicklistener = new view.onclicklistener() {
  @override
  public void onclick(view v) {
   if(v==btnphone){ //从相册获取图片
    intent intent = new intent(intent.action_pick, null);
    intent.setdataandtype(mediastore.images.media.external_content_uri, image_unspecified);
    startactivityforresult(intent, photo_zoom);
   }else if(v==btntakepicture){ //从拍照获取图片
    intent intent = new intent(mediastore.action_image_capture);
    intent.putextra(mediastore.extra_output, uri.fromfile(new file(environment
     .getexternalstoragedirectory(),"temp.jpg")));
    startactivityforresult(intent, photo_graph);
   }
  }
 };
 @override
 protected void onactivityresult(int requestcode, int resultcode, intent data) {
  if (resultcode == none)
   return;
  // 拍照
  if (requestcode == photo_graph) {
   // 设置文件保存路径
   file picture = new file(environment.getexternalstoragedirectory()
     + "/temp.jpg");
   startphotozoom(uri.fromfile(picture));
  }
  if (data == null)
   return;
  // 读取相册缩放图片
  if (requestcode == photo_zoom) {
   startphotozoom(data.getdata());
  }
  // 处理结果
  if (requestcode == photo_resoult) {
   bundle extras = data.getextras();
   if (extras != null) {
    bitmap photo = extras.getparcelable("data");
    bytearrayoutputstream stream = new bytearrayoutputstream();
    photo.compress(bitmap.compressformat.jpeg, 75, stream);// (0-100)压缩文件
    //此处可以把bitmap保存到sd卡中
    imageview.setimagebitmap(photo); //把图片显示在imageview控件上
   }
  }
  super.onactivityresult(requestcode, resultcode, data);
 }
 /**
  * 收缩图片
  * 
  * @param uri
  */
 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", 300);
  intent.putextra("outputy", 500);
  intent.putextra("return-data", true);
  startactivityforresult(intent, photo_resoult);
 }
}