android通过拍照、相册获取图片并显示 实例完整源码下载(亲测通过)

【实例简介】其中也包含了 将图片保存至 sd卡功能
【实例截图】

【核心代码】

public class MainActivity extends Activity{
	
	private static final int PHOTO_WITH_DATA = 18;  //从SD卡中得到图片
	private static final int PHOTO_WITH_CAMERA = 37;// 拍摄照片
	
	private Button btn_open;
	private ImageView iv_temp;
	private Dialog dialog_pic;
	
	private String imgPath  = "";
	private String imgName = "";
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		iv_temp = (ImageView) findViewById(R.id.imageView);
		iv_temp.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				openPictureDialog();
			}
		});
		btn_open = (Button) findViewById(R.id.btn_open);
		btn_open.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				openPictureSelectDialog();
			}
		});
	}
	/**打开对话框**/
	private void openPictureSelectDialog() {
		//自定义Context,添加主题
		Context dialogContext = new ContextThemeWrapper(MainActivity.this, android.R.style.Theme_Light);
		String[] choiceItems= new String[2];
		choiceItems[0] = "相机拍摄";  //拍照
		choiceItems[1] = "本地相册";  //从相册中选择
		ListAdapter adapter = new ArrayAdapter<String>(dialogContext, android.R.layout.simple_list_item_1,choiceItems);
		//对话框建立在刚才定义好的上下文上
		AlertDialog.Builder builder = new AlertDialog.Builder(dialogContext);
		builder.setTitle("添加图片");
		builder.setSingleChoiceItems(adapter, -1, new DialogInterface.OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog, int which) {
				switch (which) {
				case 0:  //相机
					doTakePhoto();
					break;
				case 1:  //从图库相册中选取
					doPickPhotoFromGallery();
					break;
				}
				dialog.dismiss();
			}
		});
		builder.create().show();
	}	
	
	/**打开图片查看对话框**/
	private void openPictureDialog() {
		
		
		dialog_pic = new Dialog(MainActivity.this,R.style.simple_dialog);
		
		LayoutInflater inflater = getLayoutInflater();
		View view = inflater.from(MainActivity.this).inflate(R.layout.dialog_picture, null);
		
		ImageView imgView = (ImageView) view.findViewById(R.id.img_weibo_img);
		Button btnBig = (Button) view.findViewById(R.id.btn_big);
		btnBig.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(MainActivity.this,ImgDisplayActivity.class);
				imgPath = getApplicationContext().getFilesDir() "/" imgName;
				intent.putExtra("imgUrl", imgPath); //将图片的路径传递过去
				startActivity(intent);
			}
		});
		
		
		
		
		dialog_pic.setContentView(view);
		dialog_pic.show();
		
		displayForDlg(imgView,imgPath,btnBig); //显示内容到dialog中
		
	}
	
	private void displayForDlg(ImageView imgView, String imgPath2,Button btnBig) {
		imgView.setVisibility(View.VISIBLE);
		btnBig.setVisibility(View.VISIBLE);
		imgPath = getApplicationContext().getFilesDir() "/" imgName;
		System.out.println("图片文件路径----------》" imgPath);
		if(!imgPath.equals("")) {
			Bitmap tempBitmap = BitmapFactory.decodeFile(imgPath);
			imgView.setImageBitmap(tempBitmap);//显示图片
		}
	}
	/**You will receive this call immediately before onResume() when your activity is re-starting.**/
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	   
		if(resultCode == RESULT_OK) {  //返回成功
			switch (requestCode) {
			case PHOTO_WITH_CAMERA:  {//拍照获取图片
				String status = Environment.getExternalStorageState();
				if(status.equals(Environment.MEDIA_MOUNTED)) { //是否有SD卡
					
					Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory() "/image.jpg");
					
					imgName = createPhotoFileName();
					//写一个方法将此文件保存到本应用下面啦
	            	savePicture(imgName,bitmap);

	            	if (bitmap != null) {
						//为防止原始图片过大导致内存溢出，这里先缩小原图显示，然后释放原始Bitmap占用的内存
						Bitmap smallBitmap = ImageTools.zoomBitmap(bitmap, bitmap.getWidth() / 5, bitmap.getHeight() / 5);
						
						iv_temp.setImageBitmap(smallBitmap);
					}
	            	Toast.makeText(MainActivity.this, "已保存本应用的files文件夹下", Toast.LENGTH_LONG).show();
				}else {
					Toast.makeText(MainActivity.this, "没有SD卡", Toast.LENGTH_LONG).show();
				}
				break;
			}
				case PHOTO_WITH_DATA:  {//从图库中选择图片
					ContentResolver resolver = getContentResolver();
					//照片的原始资源地址
					Uri originalUri = data.getData();  
					//System.out.println(originalUri.toString());  //" content://media/external/images/media/15838 "

//	                //将原始路径转换成图片的路径 
//	                String selectedImagePath = uri2filePath(originalUri);  
//	            	System.out.println(selectedImagePath);  //" /mnt/sdcard/DCIM/Camera/IMG_20130603_185143.jpg "
					try {
						 //使用ContentProvider通过URI获取原始图片
						Bitmap photo = MediaStore.Images.Media.getBitmap(resolver, originalUri);
						
						imgName = createPhotoFileName();
		       			//写一个方法将此文件保存到本应用下面啦
		            	savePicture(imgName,photo);
		            	
		            	if (photo != null) {
							//为防止原始图片过大导致内存溢出，这里先缩小原图显示，然后释放原始Bitmap占用的内存
							Bitmap smallBitmap = ImageTools.zoomBitmap(photo, photo.getWidth() / 5, photo.getHeight() / 5);
							
							iv_temp.setImageBitmap(smallBitmap);
						}
//		                iv_temp.setImageURI(originalUri);   //在界面上显示图片
		            	Toast.makeText(MainActivity.this, "已保存本应用的files文件夹下", Toast.LENGTH_LONG).show();
					} catch (FileNotFoundException e) {
						e.printStackTrace();
					} catch (IOException e) {
						e.printStackTrace();
					}
				break;
				}
			}
		}
		super.onActivityResult(requestCode, resultCode, data);
	}
	
   
	/**从相册获取图片**/
	private void doPickPhotoFromGallery() {
		Intent intent = new Intent();
		intent.setType("image/*");  // 开启Pictures画面Type设定为image
		intent.setAction(Intent.ACTION_GET_CONTENT); //使用Intent.ACTION_GET_CONTENT这个Action 
		startActivityForResult(intent, PHOTO_WITH_DATA); //取得相片后返回到本画面
	}
	 
	/**拍照获取相片**/
	private void doTakePhoto() {
	    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //调用系统相机
	   
	    Uri imageUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"image.jpg"));
		//指定照片保存路径（SD卡），image.jpg为一个临时文件，每次拍照后这个图片都会被替换
	    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
       
	    //直接使用，没有缩小  
        startActivityForResult(intent, PHOTO_WITH_CAMERA);  //用户点击了从相机获取
	}
	
	/**创建图片不同的文件名**/
	private String createPhotoFileName() {
		String fileName = "";
		Date date = new Date(System.currentTimeMillis());  //系统当前时间
		SimpleDateFormat dateFormat = new SimpleDateFormat("'IMG'_yyyyMMdd_HHmmss");
		fileName = dateFormat.format(date)   ".jpg";
		return fileName;
	}
	
	 /**获取文件路径**/
	 public String uri2filePath(Uri uri)  
	    {  
	        String[] projection = {MediaStore.Images.Media.DATA };  
	        Cursor cursor = managedQuery(uri, projection, null, null, null);  
	        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);  
	        cursor.moveToFirst();  
	        String path =  cursor.getString(column_index);
	        return path;  
	    }  
	 
	 /**保存图片到本应用下**/
	 private void savePicture(String fileName,Bitmap bitmap) {
		   
			FileOutputStream fos =null;
			try {//直接写入名称即可，没有会被自动创建；私有：只有本应用才能访问，重新内容写入会被覆盖
				fos = MainActivity.this.openFileOutput(fileName, Context.MODE_PRIVATE); 
				bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);// 把图片写入指定文件夹中
				
			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				try {
					if(null != fos) {
						fos.close();
						fos = null;
					}
				}catch(Exception e) {
					e.printStackTrace();
				}
			}
		}
	}