Android 实现从相册选择图片，拍照选择图片

在手机上使用应用的时候，我们通常发现一些应用的的图片选择可以从相册中选择，同时还可以通过拍照来选择刚拍下的图片。这里就做一个简单的例子来实现从以上两种方式来选择图片。

1.实现图片的选择触发点的布局

布局代码：

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< RelativeLayout          android : layout_width = "match_parent"          android : layout_height = "96dp"          android : layout_marginTop = "18dip"          android : background = "@drawable/mm_listitem"          android : gravity = "center_vertical" >                   < ! -- < ImageView              android : id = "@+id/edit_background_person_icon"              android : layout_width = "96dp"              android : layout_height = "96dp"              android : layout_alignParentRight = "true"              android : layout_centerVertical = "true"              android : layout_marginRight = "10dp"              android : background = "@drawable/noicon"              / > -- >                   < ImageView              android : id = "@+id/add_noicon"              android : layout_marginRight = "28dp"              android : layout_width = "60dp"              android : layout_height = "60dp"              android : scaleType = "fitXY"              android : layout_alignParentRight = "true"              android : layout_centerVertical = "true"              android : src = "@drawable/yunshu" / >            < TextView              android : layout_width = "wrap_content"              android : layout_height = "wrap_content"              android : layout_centerVertical = "true"              android : padding = "7dp"              android : text = "头像"              android : textSize = "20sp"              android : textColor = "#000" / >          < / RelativeLayout >

实现选择之后的弹出窗口，这里使用popwindow来实现。
布局实现：

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xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns : android = "http://schemas.android.com/apk/res/android"      android : layout_width = "296dp"      android : layout_height = "wrap_content"      android : background = "@drawable/popmenu_bg"      android : orientation = "vertical"      android : layout_marginRight = "48dp"      android : paddingBottom = "8.0dip"      android : paddingLeft = "8.0dip"      android : layout_gravity = "center"      android : gravity = "center"      android : paddingRight = "8.0dip"      android : paddingTop = "16.0dip" >        < Button            android : layout_width = "144dp"             android : layout_height = "wrap_content"             android : text = "选择图片"          android : id = "@+id/selectImage"          / >          < Button            android : layout_width = "144dp"             android : layout_height = "wrap_content"             android : text = "拍照"          android : id = "@+id/takeImage"          / >   < / LinearLayout >

弹出窗口的JAVA代码实现：

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package com . coolbeetle . assistant . menu ;   import android . content . Context ; import android . graphics . Color ; import android . graphics . drawable . ColorDrawable ; import android . view . LayoutInflater ; import android . view . View ; import android . view . View . OnClickListener ; import android . view . ViewGroup . LayoutParams ; import android . widget . PopupWindow ;   import com . coolbeetle . assistant . R ; import com . coolbeetle . assistant . menu . PopMenu . OnPopExternalItemClickListener ;   /** * upload popup implementation * * @author coolbeetle * @since 1.0 */ public class PopUpload {        private Context context ;      private PopupWindow popupWindow ;      private OnClickListener listener ;      private LayoutInflater inflater ;        public PopUpload ( Context context , OnClickListener listener ) {          this . listener = listener ;            this . context = context ;          this . inflater = ( LayoutInflater ) context                  . getSystemService ( Context . LAYOUT_INFLATER_SERVICE ) ;          View view = inflater . inflate ( R . layout . image_upload , null ) ;          view . findViewById ( R . id . selectImage ) . setOnClickListener ( this . listener ) ;          view . findViewById ( R . id . takeImage ) . setOnClickListener ( this . listener ) ;          popupWindow = new PopupWindow ( view , context . getResources ( )                  . getDimensionPixelSize ( R . dimen . popupload_width ) , // 这里宽度需要自己指定，使用                                                                  // WRAP_CONTENT                                                                  // 会很大                  LayoutParams . WRAP_CONTENT ) ;            popupWindow . setBackgroundDrawable ( new ColorDrawable ( Color . TRANSPARENT ) ) ;      }        public void setListener ( OnClickListener listener ) {          this . listener = listener ;      }        // 下拉式 弹出 pop菜单 parent 右下角      public void showAsDropDown ( View parent ) {          popupWindow . showAsDropDown ( parent ,                  10 ,                  // 保证尺寸是根据屏幕像素密度来的                  context . getResources ( ) . getDimensionPixelSize (                          R . dimen . popmenu_yoff ) ) ;            // 使其聚集          popupWindow . setFocusable ( true ) ;          // 设置允许在外点击消失              popupWindow . setOutsideTouchable ( true ) ;          // 刷新状态          popupWindow . update ( ) ;      }        // 隐藏菜单      public void dismiss ( ) {          popupWindow . dismiss ( ) ;      }   }

对于拍照的选择，这里使用了一个专门的Activity来实现：
布局实现：

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xml version = "1.0" encoding = "utf-8" ?> < RelativeLayout xmlns : android = "http://schemas.android.com/apk/res/android"      android : layout_width = "fill_parent"      android : layout_height = "wrap_content"      android : gravity = "center_horizontal"      android : orientation = "vertical" >        < LinearLayout          android : id = "@+id/dialog_layout"          android : layout_width = "fill_parent"          android : layout_height = "wrap_content"          android : layout_alignParentBottom = "true"          android : background = "@drawable/btn_style_alert_dialog_background"          android : gravity = "center_horizontal"          android : orientation = "vertical" >            < Button              android : id = "@+id/btn_take_photo"              android : layout_width = "fill_parent"              android : layout_height = "wrap_content"              android : layout_marginLeft = "20dip"              android : layout_marginRight = "20dip"              android : layout_marginTop = "20dip"              android : background = "@drawable/btn_style_alert_dialog_button"              android : text = "拍照"              android : textStyle = "bold" / >            < Button              android : id = "@+id/btn_cancel"              android : layout_width = "fill_parent"              android : layout_height = "wrap_content"              android : layout_marginBottom = "15dip"              android : layout_marginLeft = "20dip"              android : layout_marginRight = "20dip"              android : layout_marginTop = "15dip"              android : background = "@drawable/btn_style_alert_dialog_cancel"              android : text = "取消"              android : textColor = "#ffffff"              android : textStyle = "bold" / >      < / LinearLayout >   < / RelativeLayout >

Activity的Java代码实现：

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package com . coolbeetle . assistant ;     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 . util . Log ; import android . view . View ; import android . view . View . OnClickListener ; import android . widget . Button ; import android . widget . LinearLayout ; import android . widget . Toast ;   //选择拍照文件操作类 public class TakePhotoActivity extends Activity implements OnClickListener {           private LinearLayout dialogLayout ; //取消拍照      private Button takePhotoBtn ; //点击拍照      private Button cancelBtn ;      private Uri photoUri ; //自动获取照片uri      private String picPath ; //图片路径      @Override      protected void onCreate ( Bundle savedInstanceState ) {          super . onCreate ( savedInstanceState ) ;          setContentView ( R . layout . select_pic_layout ) ;          dialogLayout = ( LinearLayout ) findViewById ( R . id . dialog_layout ) ;          dialogLayout . setOnClickListener ( this ) ;          cancelBtn = ( Button ) findViewById ( R . id . btn_cancel ) ;          cancelBtn . setOnClickListener ( this ) ;          takePhotoBtn = ( Button ) findViewById ( R . id . btn_take_photo ) ;          takePhotoBtn . setOnClickListener ( this ) ;      }      public void onClick ( View v ) {          switch ( v . getId ( ) ) {          case R . id . dialog_layout :              finish ( ) ;              break ;          case R . id . btn_take_photo :              takePhoto ( ) ;              break ;          //采到了case中没列出来的状态,如cancelBtn          default :              finish ( ) ;              break ;          }      }      // 点击拍照      private void takePhoto ( ) {          //执行拍照前，应该先判断SD卡是否存在                   try {          String SDState = Environment . getExternalStorageState ( ) ;          if ( SDState . equals ( Environment . MEDIA_MOUNTED ) ) //如果有媒体安装的环境          {              Intent intent = new Intent ( MediaStore . ACTION_IMAGE_CAPTURE ) ; //传拍的照              /***              * 需要说明一下，以下操作使用+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              * 如果不使用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 ( ) ; //contentProvider存储？              photoUri = this . getContentResolver ( ) . insert ( MediaStore . Images . Media . EXTERNAL_CONTENT_URI , values ) ; //自动获得uri              intent . putExtra ( android . provider . MediaStore . EXTRA_OUTPUT , photoUri ) ;              /**-----------------*/              startActivityForResult ( intent , 1 ) ; //跳到拍照页面，这里1没用到，可以在一个onActivityResult里设置requestCode为0来接收新页面的数据。          } else {              Toast . makeText ( this , "内存卡不存在" , Toast . LENGTH_LONG ) . show ( ) ;          }          } catch ( Exception e ) {              e . printStackTrace ( ) ;          }      }           @Override      protected void onActivityResult ( int requestCode , int resultCode , Intent data ) { //这里的三个参数都没用，没有跳再新的页面传值回来          if ( resultCode == Activity . RESULT_OK && requestCode == 1 ) //&&的后面可有可无，因为只有一个返回结果，若多个就可用switch case判断一下。          {              String [ ] pojo = { MediaStore . Images . Media . DATA } ;              Cursor cursor = managedQuery ( photoUri , pojo , null , null , null ) ; //Uri 和 图片数据   得到  picPath              if ( cursor != null ) {                  int columnIndex = cursor . getColumnIndexOrThrow ( pojo [ 0 ] ) ;                  cursor . moveToFirst ( ) ;                  picPath = cursor . getString ( columnIndex ) ;                  cursor . close ( ) ;              }              Log . i ( "SelectPicActivity---------------" , "imagePath = " + picPath ) ;              /*if(picPath != null && ( picPath.endsWith(".png") || picPath.endsWith(".PNG") ||picPath.endsWith(".jpg") ||picPath.endsWith(".JPG")  ))*/              if ( picPath != null ) {                  Intent lastIntent = getIntent ( ) ; //上面putExtra 这里getIntent                  lastIntent . putExtra ( "photo_path" , picPath ) ; //这是新页面，，再传送路径  返送回去EmployeeAttendanceActivity                  setResult ( Activity . RESULT_OK , lastIntent ) ;                  finish ( ) ;              } else {                  Toast . makeText ( this , "选择文件不正确!" , Toast . LENGTH_LONG ) . show ( ) ;              }          }          super . onActivityResult ( requestCode , resultCode , data ) ;      } }

最后这里看一下 主Activity中是如何触发从相册选择图片和拍照选择图片的：

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@ Override      public void onClick ( View v ) {                   switch ( v . getId ( ) ) {          case R . id . add_noicon :              this . uploadPop . showAsDropDown ( v ) ;              break ;          case R . id . selectImage :              Intent intent = new Intent ( ) ; // intent可以过滤图片文件或其他的              intent . setType ( "image/*" ) ;              intent . setAction ( Intent . ACTION_GET_CONTENT ) ;              startActivityForResult ( intent , 22 ) ;              break ;        case R . id . takeImage :              Intent intent2 = new Intent ( getApplicationContext ( ) ,                      TakePhotoActivity . class ) ;              startActivityForResult ( intent2 , 23 ) ;              break ;          }      }

这里使用Activity的startActivytForResult这个方法，根据返回的status 码不同来分辨是相册选择还是拍照选择。

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@Override      protected void onActivityResult ( int requestCode , int resultCode , Intent data ) {          if ( resultCode == Activity . RESULT_OK ) {              switch ( requestCode ) {              case 22 :                  Uri uri = data . getData ( ) ;                  Log . e ( "Upload主页---L92--获得相册图片---------" , "uri = " + uri ) ;                  try {                      String [ ] pojo = { MediaStore . Images . Media . DATA } ;                      Cursor cursor = managedQuery ( uri , pojo , null , null , null ) ;                      if ( cursor != null ) {                          int colunm_index = cursor                                  . getColumnIndexOrThrow ( MediaStore . Images . Media . DATA ) ;                          cursor . moveToFirst ( ) ;                          String path = cursor . getString ( colunm_index ) ;                          if ( path . endsWith ( "jpg" ) || path . endsWith ( "png" ) ) {                              picPath = path ;                              ContentResolver cr = this . getContentResolver ( ) ;                              BitmapFactory . Options options = new BitmapFactory . Options ( ) ;                                 options . inSampleSize = 2 ;                              Bitmap bitmap = BitmapFactory . decodeStream ( cr . openInputStream ( uri ) , null , options ) ;                                                           ByteArrayOutputStream baos = new ByteArrayOutputStream ( ) ;                                 bitmap . compress ( Bitmap . CompressFormat . JPEG , 100 , baos ) ;                                 imageStream = new ByteArrayInputStream ( baos . toByteArray ( ) ) ;                                                           imageView . setImageBitmap ( bitmap ) ;                          } else {                              alert ( ) ;                          }                      } else {                          alert ( ) ;                      }                  } catch ( Exception e ) {                  }                  break ;              case 23 :                  imageView . setImageBitmap ( null ) ; // 设置图片位图不设null的话,                                                  // 第一次上传照片成功后，第二次上传照片会报错。                  picPath = data . getStringExtra ( "photo_path" ) ; // 从SelectPicActivity.java中传回图片路径                  Log . i ( "uploadImage" , "最终选择的图片路径=" + picPath ) ;                  BitmapFactory . Options options = new BitmapFactory . Options ( ) ;                  options . inSampleSize = 2 ;                  Bitmap bm = BitmapFactory . decodeFile ( picPath , options ) ; // 把获得的图片路径译码成位图                  ByteArrayOutputStream baos = new ByteArrayOutputStream ( ) ;                  bm . compress ( Bitmap . CompressFormat . JPEG , 100 , baos ) ;                  imageStream = new ByteArrayInputStream ( baos . toByteArray ( ) ) ;                  imageView . setImageBitmap ( bm ) ; // 把位图显示出来                  break ;                } // switch结束              requestUploadImage ( ) ;          } // if结束      } // onActivityResult结束                private void alert ( ) {          Dialog dialog = new AlertDialog . Builder ( this ) . setTitle ( "提示" )                  . setMessage (