android实例之——调用android系统相机、系统相册，并对得到的图片进行处理

最近做了这样一个Demo，调用系统相机拍照、系统相册选择照片并显示。

获取图片后进行处理，对分辨率较大的进行缩放，较小的原图显示

1、调用系统相机

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 调用系统相机
new DateFormat();
name = DateFormat.format("yyyyMMdd_hhmmss",
				Calendar.getInstance(Locale.CHINA))
				+ ".jpg";
Uri imageUri = Uri.fromFile(new File(PATH, name));

intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);//把照片保存在sd卡中指定位置。

startActivityForResult(intent, CAMERA_TAKE);

2、调用系统相册

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(intent, CAMERA_SELECT);

3、在onActivityResult方法处理得到的图片

看源码吧。。。

首先简单的布局文件

源码

public class MainActivity extends Activity {

	private Button btn_take, btn_select;
	private LinearLayout ll_show;

	// 请求
	private static final int CAMERA_TAKE = 1;
	private static final int CAMERA_SELECT = 2;

	// 图片名
	public String name;

	// 存储路径
	private static final String PATH = Environment
			.getExternalStorageDirectory() + "/DCIM";

	private boolean isBig = false;


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		btn_take = (Button) findViewById(R.id.btn_take);
		btn_select = (Button) findViewById(R.id.btn_select);
		ll_show = (LinearLayout) findViewById(R.id.ll_show);

		btn_take.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				takePhoto();
			}
		});

		btn_select.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
				intent.setType("image/*");
				startActivityForResult(intent, CAMERA_SELECT);
			}
		});

	}

	public void takePhoto() {
		Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 调用系统相机
		new DateFormat();
		name = DateFormat.format("yyyyMMdd_hhmmss",
				Calendar.getInstance(Locale.CHINA))
				+ ".jpg";
		Uri imageUri = Uri.fromFile(new File(PATH, name));

		intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);

		startActivityForResult(intent, CAMERA_TAKE);
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);

		if (resultCode == RESULT_OK) {
			switch (requestCode) {
			case CAMERA_TAKE:
				Bitmap bitmap = BitmapFactory.decodeFile(PATH + "/" + name);
				Toast.makeText(this, name, Toast.LENGTH_LONG).show();
				System.out.println(bitmap.getHeight() + "======"
						+ bitmap.getWidth());

				// 获取屏幕分辨率
				DisplayMetrics dm = new DisplayMetrics();
				getWindowManager().getDefaultDisplay().getMetrics(dm);

				// 图片分辨率与屏幕分辨率
				float scale = bitmap.getWidth() / (float) dm.widthPixels;

				Bitmap newBitMap = null;
				if (scale > 1) {
					newBitMap = zoomBitmap(bitmap, bitmap.getWidth() / scale,
							bitmap.getHeight() / scale);
					bitmap.recycle();
					isBig = true;
				}
				//添加relative布局放置img，btn
				final RelativeLayout rl_show_2 = new RelativeLayout(this);
				rl_show_2.setLayoutParams(new LayoutParams(
						RelativeLayout.LayoutParams.WRAP_CONTENT,
						RelativeLayout.LayoutParams.WRAP_CONTENT));

				ImageButton imgBtn_del_2 = new ImageButton(this);
				imgBtn_del_2.setBackgroundResource(android.R.drawable.ic_delete);

				//设置按钮的布局规则 
				RelativeLayout.LayoutParams rl_2 = new RelativeLayout.LayoutParams(
						new LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
								RelativeLayout.LayoutParams.WRAP_CONTENT));
				rl_2.addRule(RelativeLayout.ALIGN_PARENT_TOP);
				rl_2.addRule(RelativeLayout.ALIGN_RIGHT, 2);
				
				
				// 将图片显示到界面
				ImageView img = new ImageView(this);
				img.setId(2);
				img.setLayoutParams(new LayoutParams(
						LinearLayout.LayoutParams.WRAP_CONTENT,
						LinearLayout.LayoutParams.WRAP_CONTENT));
				img.setScaleType(ImageView.ScaleType.CENTER_CROP);
				img.setPadding(2, 0, 0, 5);
				if (isBig) {
					img.setImageBitmap(newBitMap);
					isBig = false;
				} else
					img.setImageBitmap(bitmap);
				
				rl_show_2.addView(img);
				rl_show_2.addView(imgBtn_del_2,rl_2);
				
				
				ll_show.addView(rl_show_2);
				
				imgBtn_del_2.setOnClickListener(new OnClickListener() {
					
					@Override
					public void onClick(View v) {
						ll_show.removeView(rl_show_2);
					}
				});
				
				break;

			case CAMERA_SELECT:
				ContentResolver resolver = getContentResolver();

				// 照片的原始资源地址
				Uri imgUri = data.getData();

				try {
					// 使用ContentProvider通过Uri获取原始图片
					Bitmap photo = MediaStore.Images.Media.getBitmap(resolver,
							imgUri);

					// 获取屏幕分辨率
					DisplayMetrics dm_2 = new DisplayMetrics();
					getWindowManager().getDefaultDisplay().getMetrics(dm_2);

					// 图片分辨率与屏幕分辨率
					float scale_2 = photo.getWidth() / (float) dm_2.widthPixels;

					Bitmap newBitMap_2 = null;
					if (scale_2 > 1) {
						newBitMap_2 = zoomBitmap(photo, photo.getWidth()
								/ scale_2, photo.getHeight() / scale_2);
						photo.recycle();
						isBig = true;
					}

					final RelativeLayout rl_show = new RelativeLayout(this);
					rl_show.setLayoutParams(new LayoutParams(
							RelativeLayout.LayoutParams.WRAP_CONTENT,
							RelativeLayout.LayoutParams.WRAP_CONTENT));

					ImageButton imgBtn_del = new ImageButton(this);
					imgBtn_del.setBackgroundResource(android.R.drawable.ic_delete);

					//设置按钮的布局规则 
					RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(
							new LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
									RelativeLayout.LayoutParams.WRAP_CONTENT));
					rl.addRule(RelativeLayout.ALIGN_PARENT_TOP);
					rl.addRule(RelativeLayout.ALIGN_RIGHT, 1);

					// 将图片显示到界面
					ImageView img_2 = new ImageView(this);
					img_2.setId(1);
					img_2.setLayoutParams(new LayoutParams(
							LinearLayout.LayoutParams.WRAP_CONTENT,
							LinearLayout.LayoutParams.WRAP_CONTENT));
					img_2.setScaleType(ImageView.ScaleType.CENTER_CROP);
					img_2.setPadding(2, 0, 0, 5);
					if (scale_2 > 1) {
						img_2.setImageBitmap(newBitMap_2);
						isBig = false;
					} else
						img_2.setImageBitmap(photo);
					
					//将img，btn添加
					rl_show.addView(img_2);
					rl_show.addView(imgBtn_del,rl);

					ll_show.addView(rl_show);

					imgBtn_del.setOnClickListener(new OnClickListener() {

						@Override
						public void onClick(View v) {
							ll_show.removeView(rl_show);
						}
					});

				} catch (Exception e) {
					// TODO: handle exception
				}

				break;
			}
		}
	}

	// 对分辨率较大的图片进行缩放
	public Bitmap zoomBitmap(Bitmap bitmap, float width, float height) {

		int w = bitmap.getWidth();

		int h = bitmap.getHeight();

		Matrix matrix = new Matrix();

		float scaleWidth = ((float) width / w);

		float scaleHeight = ((float) height / h);

		matrix.postScale(scaleWidth, scaleHeight);// 利用矩阵进行缩放不会造成内存溢出

		Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);

		return newbmp;

	}
}

ok，结束。。

附上Demo