android调取系统相册和照相机选取图片

在让用户自定义头像或皮肤的时候  可能会采取照相或选取相册等方法来实现用户自定义，这里我们就简单实现一下~

在这里先贴出布局-----仅供参考

activity_main://一张图片而已  很简单

activity_select_photo://选择图片   其中有一些图片资源和动画，在文末分享给大家

-----------MainActivity-----------

图片监听事件   点击跳转选择页面使用回调

	/** 选择文件 */
	public static final int TO_SELECT_PHOTO = 1;

         //图片选择事件
		imgtrue.setOnClickListener(new OnClickListener() {
			Intent intent;
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				intent = new Intent(this, SelectPhotoActivity.class);
				startActivityForResult(intent, TO_SELECT_PHOTO);
				intent = null;
			}
		});

回调方法 接收图片地址  设置给控件

	@SuppressWarnings("deprecation")
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (resultCode == Activity.RESULT_OK && requestCode == TO_SELECT_PHOTO) {
			picPath = data.getStringExtra(SelectPhotoActivity.KEY_PHOTO_PATH);
			Bitmap bm = BitmapFactory.decodeFile(picPath);
			zoomBitmap = zoomBitmap(bm, 300, 300);
			imgtrue.setBackgroundDrawable(new BitmapDrawable(bm));
		}
		super.onActivityResult(requestCode, resultCode, data);
	}

将获取的图片按宽高进行缩放

	/**
	 * 将原图按照指定的宽高进行缩放
	 * 
	 * @param oldBitmap
	 * @param newWidth
	 * @param newHeight
	 * @return
	 */
	private Bitmap zoomBitmap(Bitmap oldBitmap, int newWidth, int newHeight) {
		int width = oldBitmap.getWidth();
		int height = oldBitmap.getHeight();
		float scaleWidth = ((float) newWidth) / width;
		float scaleHeight = ((float) newHeight) / height;
		Matrix matrix = new Matrix();
		matrix.postScale(scaleWidth, scaleHeight);
		Bitmap newBitmap = Bitmap.createBitmap(width, height, Config.RGB_565);
		Canvas canvas = new Canvas(newBitmap);
		canvas.drawBitmap(newBitmap, matrix, null);
		return newBitmap;
	}

------------------SelectPhotoActivity------------------

//图片选择

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class SelectPhotoActivity extends Activity implements OnClickListener {
	/** 使用照相机拍照获取图片 */
	public static final int SELECT_PIC_BY_TACK_PHOTO = 1;
	/** 使用相册中的图片 */
	public static final int SELECT_PIC_BY_PICK_PHOTO = 2;
	/** 开启相机 */
	private Button btn_take_photo;
	/** 开启图册 */
	private Button btn_pick_photo;
	/** 取消 */
	private Button btn_cancel;
	/** 获取到的图片路径 */
	private String picPath;
	private Intent lastIntent;
	private Uri photoUri;
	/** 从Intent获取图片路径的KEY */
	public static final String KEY_PHOTO_PATH = "photo_path";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_select_photo);
		btn_take_photo = (Button) findViewById(R.id.btn_take_photo);
		btn_pick_photo = (Button) findViewById(R.id.btn_pick_photo);
		btn_cancel = (Button) findViewById(R.id.btn_cancel);

		lastIntent = getIntent();

		btn_take_photo.setOnClickListener(this);
		btn_pick_photo.setOnClickListener(this);
		btn_cancel.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
			case R.id.btn_take_photo : // 开启相机
				takePhoto();
				break;
			case R.id.btn_pick_photo : // 开启图册
				pickPhoto();
				break;
			case R.id.btn_cancel : // 取消操作
				this.finish();
				break;
			default :
				break;
		}
	}
	private void takePhoto() {
		//  执行拍照前，应该先判断SD卡是否存在
		String SDState = Environment.getExternalStorageState();
		if (SDState.equals(Environment.MEDIA_MOUNTED)) {
			Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// "android.media.action.IMAGE_CAPTURE"
			/***
			 * 需要说明一下，以下操作使用照相机拍照，拍照后的图片会存放在相册中的 这里使用的这种方式有一个好处就是获取的图片是拍照后的原图
			 * 如果不实用ContentValues存放照片路径的话，拍照后获取的图片为缩略图不清晰
			 */
			ContentValues values = new ContentValues();
			photoUri = this.getContentResolver().insert(
					MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
			intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, photoUri);
			startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO);
		} else {
			Toast.makeText(getApplicationContext(), "内存卡不存在",
					Toast.LENGTH_SHORT).show();
		}
	}

	/***
	 *  从相册中取图片
	 */
	private void pickPhoto() {
		Intent intent = new Intent();
		intent.setType("image/*");
		intent.setAction(Intent.ACTION_GET_CONTENT);
		startActivityForResult(intent, SELECT_PIC_BY_PICK_PHOTO);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		finish();
		return super.onTouchEvent(event);
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (resultCode == Activity.RESULT_OK) {
			doPhoto(requestCode, data);
		}
		super.onActivityResult(requestCode, resultCode, data);
	}

	/**
	 * 选择图片后，获取图片的路径
	 */
	private void doPhoto(int requestCode, Intent data) {
		if (requestCode == SELECT_PIC_BY_PICK_PHOTO) {// 从相册取图片，有些手机有异常情况，请注意
			if (data == null) {
				Toast.makeText(getApplicationContext(), "选择图片文件出错",
						Toast.LENGTH_SHORT).show();
				return;
			}
			photoUri = data.getData();
			if (photoUri == null) {
				Toast.makeText(getApplicationContext(), "选择图片文件出错",
						Toast.LENGTH_SHORT).show();
				return;
			}
		}
		String[] pojo = {MediaStore.Images.Media.DATA};
		@SuppressWarnings("deprecation")
		Cursor cursor = managedQuery(photoUri, pojo, null, null, null);
		if (cursor != null) {
			int columnIndex = cursor.getColumnIndexOrThrow(pojo[0]);
			cursor.moveToFirst();
			picPath = cursor.getString(columnIndex);
			cursor.close();
		}
		if (picPath != null
				&& (picPath.endsWith(".png") || picPath.endsWith(".PNG")
						|| picPath.endsWith(".jpg") || picPath.endsWith(".JPG"))) {
			lastIntent.putExtra(KEY_PHOTO_PATH, picPath);
			setResult(Activity.RESULT_OK, lastIntent);
			finish();
		} else {
			Toast.makeText(getApplicationContext(), "选择图片文件不正确",
					Toast.LENGTH_SHORT).show();
		}
	}

}

其中会使用到intent的跳转，我们可以在跳转期间添加动画以及背景透明:

资源分享：

动画anim
push_bottom_in.xml

push_bottom_out.xml:

strings.xml资源

拍照选取
相册选取
取消

stype.xml资源

图片资源: