android本地图片选择(相册选取，相机拍摄)

　最近由于项目的需要，要求用户可以上传自己拍的照片和图库中的已有照片，这是一个App比较基础性的功能，就索性将整个功能抽出来写成一个组件，以方面其它的App再实现此功能时可直接拿来使用．

　话不多说，先看一下效果图，弹出选择方式window :

点击：Select from gallery,从本地机册中选择图片，如图：

点击：Take a photot就不再上传截图了．

下面将实现的主要代码出，如有需要可稍做修改即可做为一个组件使用，以下没布局文件．

public class TakePhoto
{protected Activity mActivity;protected Intent mIntent = null;protected static final int PHOTO_REQUEST_TAKEPHOTO = 0x00000001;protected static final int PHOTO_REQUEST_CUT = 0x00000002;protected Uri currentUri = null;protected TakePhotoListener mTakePhotoListener;protected View mDisplayView;private String sdcardPath = null;private String fileBasePath = null;private int aspectX = 1;private int aspectY = 1;private int outputX = 480;private int outputY = 480;public TakePhoto(Activity activity, View displayView, TakePhotoListener takePhotoListener){this.mActivity = activity;this.mDisplayView = displayView;this.mTakePhotoListener = takePhotoListener;initLocalFilePath(mActivity);startSelectImage();}public TakePhoto(Activity activity, View displayView, int aspectX, int aspectY, int outputX, int outputY,TakePhotoListener takePhotoListener){this.mActivity = activity;this.mDisplayView = displayView;this.aspectX = aspectX;this.aspectY = aspectY;this.outputX = outputX;this.outputY = outputY;this.mTakePhotoListener = takePhotoListener;initLocalFilePath(mActivity);startSelectImage();}private void initLocalFilePath(Activity activity){sdcardPath = activity.getExternalCacheDir().toString() + "/capturePicture/";fileBasePath = "file://" + sdcardPath;}public void onActivityResult(int requestCode, int resultCode, Intent data){switch (requestCode){case PHOTO_REQUEST_CUT:try{setDisplayViewImage();}catch (FileNotFoundException e){mTakePhotoListener.onFail(TakePhotoFailReason.FileNotFound);}catch (OutOfMemoryError e){mTakePhotoListener.onFail(TakePhotoFailReason.OutOfMemory);}break;}}protected void startSelectImage(){}protected Uri getCurrentUri(){Date date = new Date(System.currentTimeMillis());SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss");Log.i("------currentImageUri--------", fileBasePath + dateFormat.format(date) + ".jpg");return Uri.parse(fileBasePath + dateFormat.format(date) + ".jpg");}protected void cropImageUri(Uri uri){try{// ���òü�mIntent.putExtra("crop", "true");// aspectX aspectY �ǿ�ߵı���mIntent.putExtra("aspectX", aspectX);mIntent.putExtra("aspectY", aspectY);// outputX outputY �ǲü�ͼƬ���mIntent.putExtra("outputX", outputX);mIntent.putExtra("outputY", outputY);mIntent.putExtra("scale", true);mIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);mIntent.putExtra("return-data", false);mIntent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());mIntent.putExtra("noFaceDetection", true); // no face detectionmActivity.startActivityForResult(mIntent, PHOTO_REQUEST_CUT);}catch (ActivityNotFoundException e){mTakePhotoListener.onFail(TakePhotoFailReason.ActivityNotFound);}}protected void setDisplayViewImage() throws FileNotFoundException{if (currentUri != null){Bitmap bitmap = BitmapFactory.decodeFile(currentUri.getPath());if (bitmap == null){throw new FileNotFoundException();}if (mDisplayView instanceof ImageView){((ImageView) mDisplayView).setImageBitmap(bitmap);}else{Drawable drawable = new BitmapDrawable(mActivity.getResources(), bitmap);mDisplayView.setBackgroundDrawable(drawable);}mTakePhotoListener.onSuccess(currentUri.getPath(), mDisplayView, bitmap);}}protected boolean existSDCard(){if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){return true;}else return false;}protected void createPhotoDir(){File file = new File(sdcardPath);if (!file.exists()){file.mkdirs();}}public interface TakePhotoListener{public void onSuccess(String imagePath, View displayView, Bitmap bitmap);public void onFail(TakePhotoFailReason failReason);}public enum TakePhotoFailReason{ActivityNotFound, FileNotFound, OutOfMemory, SDCardNotFound}
}

//TakePhoto子类，实现从相机拍照生成图片
package com.focustech.capturepicture;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.provider.MediaStore;
import android.view.View;public class CameraTakePhoto extends TakePhoto
{/*** 构造方法* @param activity        页面对象* @param displayView   图片显示对象* @param takePhotoListener   图片回调*/public CameraTakePhoto(Activity activity, View displayView, TakePhotoListener takePhotoListener){super(activity, displayView, takePhotoListener);}/*** 构造方法* @param activity 页面对象* @param displayView   图片显示对象* @param aspectX 裁剪宽比例* @param aspectY  裁剪高比例* @param outputX  裁剪宽度* @param outputY   裁剪高度* @param takePhotoListener 图片回调*/public CameraTakePhoto(Activity activity, View displayView, int aspectX, int aspectY, int outputX, int outputY,TakePhotoListener takePhotoListener){super(activity, displayView, aspectX, aspectY, outputX, outputY, takePhotoListener);}@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data){if (resultCode != Activity.RESULT_OK){return;}super.onActivityResult(requestCode, resultCode, data);switch (requestCode){case PHOTO_REQUEST_TAKEPHOTO:cropCurrentImage(currentUri);break;}}private void cropCurrentImage(Uri currentUri){mIntent = new Intent("com.android.camera.action.CROP");mIntent.setDataAndType(currentUri, "image/*");cropImageUri(currentUri);}@Overrideprotected void startSelectImage(){try{if (existSDCard()){createPhotoDir();currentUri = getCurrentUri();Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);intent.putExtra(MediaStore.EXTRA_OUTPUT, currentUri);mActivity.startActivityForResult(intent, PHOTO_REQUEST_TAKEPHOTO);}else{mTakePhotoListener.onFail(TakePhotoFailReason.SDCardNotFound);}}catch (ActivityNotFoundException e){mTakePhotoListener.onFail(TakePhotoFailReason.ActivityNotFound);}}}//TakePhoto子类，实现从本地图册中选择图片
public class GalleryTakePhoto extends TakePhoto
{/*** 构造方法* @param activity        页面对象* @param displayView    图片显示对象* @param takePhotoListener    图片回调*/public GalleryTakePhoto(Activity activity, View displayView, TakePhotoListener takePhotoListener){super(activity, displayView, takePhotoListener);}/*** 构造方法* @param activity    页面对象* @param displayView    图片显示对象* @param aspectX    裁剪宽比例* @param aspectY    裁剪高比例* @param outputX    裁剪宽度* @param outputY    裁剪高度* @param takePhotoListener    图片回调*/public GalleryTakePhoto(Activity activity, View displayView, int aspectX, int aspectY, int outputX, int outputY,TakePhotoListener takePhotoListener){super(activity, displayView, aspectX, aspectY, outputX, outputY, takePhotoListener);}@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data){if (resultCode != Activity.RESULT_OK){return;}super.onActivityResult(requestCode, resultCode, data);}@Overrideprotected void startSelectImage(){if (existSDCard()){createPhotoDir();currentUri = getCurrentUri();mIntent = new Intent(Intent.ACTION_GET_CONTENT);mIntent.setType("image/*");cropImageUri(currentUri);}else{mTakePhotoListener.onFail(TakePhotoFailReason.SDCardNotFound);}}
}

测试Activity...

package com.focustech.capturepicture;import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RelativeLayout;import com.focustech.capturepicture.TakePhoto.TakePhotoFailReason;
import com.focustech.capturepicture.TakePhoto.TakePhotoListener;public class TestActivity extends Activity implements OnClickListener
{private RelativeLayout img_btn;private Button btn1;private Button btn2;private TakePhoto takePhoto;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();}// ��ʼ���ؼ�private void init(){img_btn = (RelativeLayout) findViewById(R.id.img_btn);btn1 = (Button) findViewById(R.id.btn1);btn2 = (Button) findViewById(R.id.btn2);// ΪImageButton��Button��Ӽ����¼�btn1.setOnClickListener(this);btn2.setOnClickListener(this);}// ����¼�@Overridepublic void onClick(View v){switch (v.getId()){case R.id.btn1:// ������õ�Activity,��ʾ�ؼ�����,��ȡͼƬ�ص�takePhoto = new CameraTakePhoto(this, img_btn, listener);break;case R.id.btn2:takePhoto = new GalleryTakePhoto(this, img_btn, listener);break;}}private TakePhotoListener listener = new TakePhotoListener(){@Overridepublic void onSuccess(String imagePath, View displayView, Bitmap bitmap){//���ݴ���Ŀؼ�ID����switch (displayView.getId()){case R.id.img_btn:Log.e("==========onSuccess=============", imagePath);break;}}@Overridepublic void onFail(TakePhotoFailReason failReason){Log.e("=======onFail===========", failReason.toString());}};@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data){if (takePhoto != null){takePhoto.onActivityResult(requestCode, resultCode, data);}}@Overridepublic void onConfigurationChanged(Configuration newConfig){super.onConfigurationChanged(newConfig);}
}

思路：其实功能是没有什么复杂的，就是调用系统功能去实现自己想要的功能，主要想表达的一点就是组件化的编程，好处是非常之多的，只要一次编写，以后就可以直接拿来用了，也正是体现了Java封装的强大之处．组件整个工程上传到了我的资源里，有需要的请下载。

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