前言
Android应用中经常会遇到上传相册图片的需求,这里记录一下如何进行相册图片的选取和裁剪。
相册选取图片
1. 激活相册或是文件管理器,来获取相片,代码如下:
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private static final int TAKE_PICTURE_FROM_ALBUM = 1 ; private void takePictureFromAlbum() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType( "image/*" ); startActivityForResult(intent, TAKE_PICTURE_FROM_ALBUM); } |
2. 通过startAcitivityForResult()方法,我们可以在onAcitivityResult()中来获取图片的URI,然后将图片的URI传递给图片裁剪函数,代码如下:
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@Override protected void onActivityResult( int requestCode, int resultCode, Intent data) { if (resultCode == Activity.RESULT_OK) { switch (requestCode) { case TAKE_PICTURE_FROM_ALBUM: if (data != null ) { cropPictureFromAlbum(data.getData()); } break ; case PICTURE_CROP_CODE: if (data != null ) { // 这是裁剪后图片的bitmap Bitmap bitmap = data.getParcelableExtra( "data" ); } break ; default : break ; } } } private static final int TAKE_PICTURE_FROM_ALBUM = 1 ; private void takePictureFromAlbum() { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType( "image/*" ); startActivityForResult(intent, TAKE_PICTURE_FROM_ALBUM); } private static final int PICTURE_CROP_CODE = 2 ; private void cropPictureFromAlbum(Uri pictureUri) { Intent intent = new Intent( "com.android.camera.action.CROP" ); intent.setDataAndType(pictureUri, "image/*" ); intent.putExtra( "crop" , "true" ); // 裁剪框比例 intent.putExtra( "aspectX" , 1 ); intent.putExtra( "aspectY" , 2 ); // 裁剪后输入图片的尺寸大小 intent.putExtra( "outputX" , 300 ); intent.putExtra( "outputY" , 300 ); // 取消人脸识别 intent.putExtra( "noFaceDetection" , true ); intent.putExtra( "return-data" , true ); startActivityForResult(intent, PICTURE_CROP_CODE); } |
3. 在onActivityResult里,通过data.getParcelableExtra("data")可以获取图片裁剪之后的bitmap,之后就可以将bitmap赋值给图片控件了。