android从本地获取图片

从SD卡中获取图片资源，或者拍一张新的图片。

先贴代码

获取图片：

 

<EM><STRONG>    CharSequence[] items = {"相册","相机"};    
         new AlertDialog.Builder(this)
            .setTitle("选择图片来源")
            .setItems(items, new OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {
          if( which == SELECT_PICTURE ){
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            intent.setType("image/*");
            startActivityForResult(Intent.createChooser(intent, "选择图片"), SELECT_PICTURE);    
                     }else{
                        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);    
                        startActivityForResult(intent, SELECT_CAMER);    
                     }
        }
      })
      .create().show(); </STRONG></EM>

 

注释：拍照获取的话，可以指定图片的保存地址，在此不说明。

 

 

处理图片，方法一，直接处理返回图片：

<EM><STRONG><STRONG> protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == RESULT_OK){
//选择图片
Uri uri = data.getData();
ContentResolver cr = this.getContentResolver();
try {
if(bmp != null)//如果不释放的话，不断取图片，将会内存不够
bmp.recycle();
bmp = BitmapFactory.decodeStream(cr.openInputStream(uri));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("the bmp toString: " + bmp);
imageSV.setBmp(bmp);
}else{
Toast.makeText(SetImageActivity.this, "请重新选择图片", Toast.LENGTH_SHORT).show();
}

}</STRONG></STRONG></EM>

注释：

1、网上有说明，直接处理返回的图片是被系统压缩过的，不过自己在测试的过程并没有区别；

2、如果用户不断的重新获取图片的话，必须把现在的Bmp内存释放，否则会报错！ bmp.recycle()。

 

 

处理图片，方法二，获得图片的地址再处理：

 

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if(resultCode == RESULT_OK){
    Uri uri = data.getData();    
    String [] proj={MediaStore.Images.Media.DATA};
    Cursor cursor = managedQuery( uri,
        proj,                                 // Which columns to return
        null,             // WHERE clause; which rows to return (all rows)
        null,             // WHERE clause selection arguments (none)
        null);                                // Order-by clause (ascending by name)
    
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    
    String path = cursor.getString(column_index);
    bmp = BitmapFactory.decodeFile(path);
    System.out.println("the path is :" + path);
  }else{
    Toast.makeText(SetImageActivity.this, "请重新选择图片", Toast.LENGTH_SHORT).show();
  }
    
}

 

转自：http://blog.csdn.net/you_and_me12/article/details/7262988