小编Vik*_*rma的帖子

在这里，我已经编写了来自画廊的图像选择器的代码，但是谁能告诉我setAction()和的卷是什么addCategory()？

意图类文件中有很多“静态最终字符串”可用，我完全不知道在我的程序中使用这些 ACTION 和 CATEGORY 参数

public class ImagePicker extends BaseActivity implements View.OnClickListener {

  private final int PICK_FROM_GALLERY_REQUEST = 1;
  private ImageView pickedImage;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.onStart();
    setContentView(R.layout.activity_image_picker);
    pickedImage= (ImageView) findViewById(R.id.image);
    Button cameraButton= (Button) findViewById(R.id.pick_from_camera);
    Button galleryButton= (Button) findViewById(R.id.pick_from_gallery);
    cameraButton.setOnClickListener(this);
    galleryButton.setOnClickListener(this);
    setViewHeight(pickedImage);
  }

  private void setViewHeight(ImageView pickedImage) {
    DisplayMetrics displayMetrics=getResources().getDisplayMetrics();
    pickedImage.getLayoutParams().height=displayMetrics.heightPixels/2;
  }


  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode==PICK_FROM_GALLERY_REQUEST && resultCode==RESULT_OK && data!=null){
        InputStream stream …