<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     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=".MainActivity" >

     <Button

         android:id="@+id/btnTakePic"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="拍照" />

     <ImageView

         android:id="@+id/imgview"

         android:layout_width="100dp"

         android:layout_height="100dp"

         android:layout_alignLeft="@+id/btnTakePic"

         android:layout_below="@+id/btnTakePic"

         android:layout_marginTop="38dp" />

 </RelativeLayout>

 package com.example.takepictrures;

 import java.io.ByteArrayOutputStream;

 import java.io.File;

 import java.io.IOException;

 import java.text.SimpleDateFormat;

 import java.util.Date;

 import com.example.util.saveToSdCard;

 import android.net.Uri;

 import android.os.Bundle;

 import android.os.Environment;

 import android.provider.MediaStore;

 import android.provider.MediaStore.Audio.Media;

 import android.app.Activity;

 import android.content.ContentValues;

 import android.content.Intent;

 import android.graphics.Bitmap;

 import android.graphics.BitmapFactory;

 import android.view.Menu;

 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 Button button;

     private static final int PHOTO_GRAPH = 1;// ����

     public ImageView imageView;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         imageView = (ImageView) this.findViewById(R.id.imgview);

         button = (Button) this.findViewById(R.id.btnTakePic);

         button.setOnClickListener(this);

     }

     @Override

     public boolean onCreateOptionsMenu(Menu menu) {

         // Inflate the menu; this adds items to the action bar if it is present.

         getMenuInflater().inflate(R.menu.main, menu);

         return true;

     }

     @Override

     public void onClick(View view) {

         switch (view.getId()) {

         case R.id.btnTakePic:

             Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

             startActivityForResult(intent, PHOTO_GRAPH);

             break;

         default:

             break;

         }

     }

     @Override

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

         if (resultCode == NONE)

             return;

         if (requestCode == PHOTO_GRAPH) {

             File picture = new File(Environment.getExternalStorageDirectory()

                     + "/temp.jpg");

             // startPhotoZoom(Uri.fromFile(picture));

         }

         if (data == null)

             return;

         // if (requestCode == PHOTO_ZOOM) {

         // startPhotoZoom(data.getData());

         // }

         String fileName = "";

         if (requestCode == 1) {

             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)ѹ���ļ�

                     ///这儿保存到sd卡就Ok了

                 try {

                     fileName = saveToSdCard.getFileName();

                     saveToSdCard.saveMyBitmap(photo, fileName);

                 } catch (IOException e) {

                     // TODO Auto-generated catch block

                     e.printStackTrace();

                 }

                 imageView.setImageBitmap(photo);

             }

         }

         super.onActivityResult(requestCode, resultCode, data);

     }

     // 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

     // intent.putExtra("aspectX", 1);

     // intent.putExtra("aspectY", 1);

     // // outputX outputY

     // intent.putExtra("outputX", 300);

     // intent.putExtra("outputY", 500);

     // intent.putExtra("return-data", true);

     // startActivityForResult(intent, PHOTO_RESOULT);

     // }

 }