mainActivity如下:

package cn.testcamera; 
import java.io.File; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import android.app.Activity; 
import android.content.ContentResolver; 
import android.content.ContentUris; 
import android.content.Intent; 
import android.database.Cursor; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.net.Uri; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 
 
public class MainActivity extends Activity { 
    private Button mButton; 
    private ImageView mImageView; 
    private File mPhotoFile; 
    private String mPhotoPath; 
    private Uri mPhotoOnSDCardUri; 
    public final static int CAMERA_RESULT=777; 
    public final static int CAMERA_RESULT_CUT=888; 
    public final static int CAMERA_RESULT_CUT_OVER=999; 
    public final static String TAG="xx"; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        mButton = (Button) findViewById(R.id.button); 
        mButton.setOnClickListener(new ButtonOnClickListener()); 
        mImageView = (ImageView) findViewById(R.id.imageView); 
 
    } 
 
    private class ButtonOnClickListener implements View.OnClickListener { 
        public void onClick(View v) { 
            try { 
                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); 
                mPhotoPath="mnt/sdcard/DCIM/Camera/"+getPhotoFileName(); 
                mPhotoFile = new File(mPhotoPath); 
                if (!mPhotoFile.exists()) { 
                    mPhotoFile.createNewFile(); 
                } 
                mPhotoOnSDCardUri=Uri.fromFile(mPhotoFile); 
                intent.putExtra(MediaStore.EXTRA_OUTPUT, mPhotoOnSDCardUri); 
                //拍照后显示此图片 
                //startActivityForResult(intent,CAMERA_RESULT); 
                //拍照后先修改再显示此图片 
                startActivityForResult(intent,CAMERA_RESULT_CUT); 
            } catch (Exception e) { 
            } 
        } 
    } 
 
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
        super.onActivityResult(requestCode, resultCode, data); 
        //1   拍照后显示照片 
        if (requestCode==CAMERA_RESULT) { 
             Bitmap bitmap = BitmapFactory.decodeFile(mPhotoPath, null);   
             mImageView.setImageBitmap(bitmap); 
        } 
        //2   拍照后剪切照片,然后显示 
        //2.1拍照且剪裁 
        if (requestCode == CAMERA_RESULT_CUT) { 
            Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,mPhotoOnSDCardUri); 
            sendBroadcast(intent); 
            try { 
                Thread.sleep(2000); 
            } catch (InterruptedException e) { 
                e.printStackTrace(); 
            } 
            Uri systemImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 
            ContentResolver contentResolver = getContentResolver(); 
            Cursor cursor = contentResolver.query(systemImageUri, null, 
                    MediaStore.Images.Media.DISPLAY_NAME + "='" 
                            + mPhotoFile.getName() + "'", null, null); 
            Uri photoUriInMedia = null; 
            if (cursor != null && cursor.getCount() > 0) { 
                cursor.moveToLast(); 
                long id = cursor.getLong(0); 
                photoUriInMedia = ContentUris.withAppendedId(systemImageUri, id); 
            } 
            cursor.close(); 
            Intent in = new Intent("com.android.camera.action.CROP"); 
            //需要裁减的图片格式 
            in.setDataAndType(photoUriInMedia, "image/*"); 
            //允许裁减 
            in.putExtra("crop", "true"); 
            //剪裁后ImageView显时图片的宽 
            in.putExtra("outputX", 250); 
            //剪裁后ImageView显时图片的高 
            in.putExtra("outputY", 250); 
            //设置剪裁框的宽高比例 
            in.putExtra("aspectX", 1); 
            in.putExtra("aspectY", 1); 
            in.putExtra("return-data", true); 
            startActivityForResult(in, CAMERA_RESULT_CUT_OVER); 
        } 
        //2.2显示 
        if (requestCode==CAMERA_RESULT_CUT_OVER) { 
            //剪切图片的时候,若"放弃"则回答的data为null 
            if (data!=null) { 
                Bitmap bitmap = (Bitmap) data.getExtras().get("data"); 
                mImageView.setImageBitmap(bitmap); 
            } 
        } 
    } 
 
    private String getPhotoFileName() { 
        Date date = new Date(System.currentTimeMillis()); 
        SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss"); 
        return dateFormat.format(date) + ".jpg"; 
    } 
} 

main.xml
<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" > 
 
    <Button 
        android:id="@+id/button" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="点击按钮拍照" 
     /> 
    <ImageView  
        android:id="@+id/imageView" 
        android:layout_below="@id/button" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
     /> 
 
</RelativeLayout> 

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="cn.testcamera" 
    android:versionCode="1" 
    android:versionName="1.0" > 
 
    <uses-sdk 
        android:minSdkVersion="8" 
        android:targetSdkVersion="10" /> 
    <uses-permission android:name="android.permission.CAMERA"/> 
    <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
 
    <application 
        android:icon="@drawable/ic_launcher" 
        android:label="@string/app_name" 
        android:theme="@style/AppTheme" > 
        <activity 
            android:name=".MainActivity" 
            android:launchMode="singleTask" 
            android:label="@string/title_activity_main" > 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 
                <category android:name="android.intent.category.LAUNCHER" /> 
            </intent-filter> 
        </activity> 
    </application> 
 
</manifest>

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