Android 获得选择的系统相册图片

public void onActivityResult(int requestCode, int resultCode,
final Intent data) {
if (RESULT_OK == resultCode && 1 == requestCode) {
LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.dialog,
(ViewGroup) findViewById(R.id.dialog));

Builder mydialog = new AlertDialog.Builder(ImChoose.this);
mydialog.setView(layout);
iv = (ImageView) layout.findViewById(R.id.iv);
uri = data.getData();
ContentResolver cr = this.getContentResolver();
try {
bm = BitmapFactory.decodeStream(cr.openInputStream(uri));
iv.setImageBitmap(bm);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mydialog.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
// iv1.setImageURI(uri);
iv1.setImageBitmap(bm);
}

});

// 设置重写重新选择键
mydialog.setNeutralButton("重新选择", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(intent.ACTION_GET_CONTENT);
startActivityForResult(intent, 1);

}
});
mydialog.setNegativeButton("取消", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(ImChoose.this, "cancel", Toast.LENGTH_SHORT)
.show();

}
});

mydialog.create();
mydialog.show();
}
super.onActivityResult(requestCode, resultCode, data);
}