Question

我是android的初学者，在我的项目中，我想从库中添加文本和图像，从添加活动和发送到主要活动以在列表视图中显示，这是主要活动

上的添加按钮的代码

export const addtest = (tests) => ({
  type: 'ADD_TEST_UNIT',
  tests
});

这是添加活动的代码

  Intent intentForAdd = new Intent(getApplicationContext(),addActivity.class);
  startActivityForResult(intentForAdd,requestcode2);

这是MainActivity中的onActivityResult方法，用于从列表视图中添加活动和置换中接收数据，如何从添加活动接收图像？

boolean ownImage = false;
final private int PICK_IMAGE = 1;
byte[] imageDat;
Button buttonAdd,cameraB;
ImageView imageAdd;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_add);
    idAdd = findViewById(R.id.idAdd);
    nameAdd = findViewById(R.id.nameAdd);
    cameraB = findViewById(R.id.cameraB);

    buttonAdd = findViewById(R.id.buttonAdd);
    imageAdd = findViewById(R.id.imageAdd);
    buttonAdd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            int idA = Integer.parseInt(idAdd.getText().toString());
            String nameA = nameAdd.getText().toString();
            Intent intent = new Intent();
            intent.putExtra("NameAdd", nameA);
            intent.putExtra("IdAdd", idA);
            intent.putExtra("ImageAdd",imageData);
            setResult(Activity.RESULT_OK, intent);
            finish();
        }
    });
    cameraB.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(Intent.createChooser(intent,"Choose Image From"),PICK_IMAGE);

        }
    });
}
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode != Activity.RESULT_CANCELED){
        if (requestCode == PICK_IMAGE){
            try{
                Uri uri = data.getData();
                Bitmap bitmap;
                bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
                imageAdd.setImageBitmap(bitmap);
                ownImage = true;
                ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.PNG,100,byteArrayOutputStream);
                imageData = byteArrayOutputStream.toByteArray();
            } catch (Exception e) {
                Toast.makeText(getBaseContext(),e.toString(),Toast.LENGTH_LONG).show();
            }
        }else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}

最后这是员工类

  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == requestcode2){
        if(resultCode == Activity.RESULT_OK){
            String nameAdd = data.getStringExtra("NameAdd");
            int idAdd = data.getIntExtra("IdAdd", 0);
            byte[] img = data.getByteArrayExtra("ImageAdd");
            Employee e = new Employee(idAdd,nameAdd,img);
            list.add(e);
            adapter.notifyDataSetChanged();
            Toast.makeText(getApplicationContext(),"Added Successfully",Toast.LENGTH_LONG).show();
        }
    }
}

我添加文本时代码运行正常，但Image中的问题没有显示在列表中

Answer 1

如果您的唯一目标是保存变量并与其他活动共享（您不是这样做以了解如何从意图中获取图像），您是否只能将变量声明为静态？

从意图中获取图像

1 个答案: