Android开发之系统相机相册使用

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;


     @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。。