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

<LinearLayout 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"    android:orientation="vertical" >    <Button        android:id="@+id/btn_take"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/take" />    <Button        android:id="@+id/btn_select"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/selectFrom" />    <ScrollView        android:id="@+id/sv_show"        android:layout_width="match_parent"        android:layout_height="match_parent" >        <LinearLayout            android:id="@+id/ll_show"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:orientation="vertical" >        </LinearLayout>    </ScrollView></LinearLayout>

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;@Overrideprotected 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() {@Overridepublic void onClick(View v) {takePhoto();}});btn_select.setOnClickListener(new OnClickListener() {@Overridepublic 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);}@Overrideprotected 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，btnfinal 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;} elseimg.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() {@Overridepublic 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;} elseimg_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() {@Overridepublic 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