如何在android studio中使用bundle将数据发送到下一个活动

Question

这是细节活动..。我使用意图putExtra将数据从这个活动发送到下一个活动。

public class Detail_Activity extends AppCompatActivity {

    ImageView ivImage2;
    TextView txtDescription, txtName, txtPrice;
    String key = "";
    String imageUrl = "";
    Button delete_Recipe, update_Recipe;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_detail);

        ivImage2 = (ImageView)findViewById(R.id.ivImage2);
        txtDescription = (TextView) findViewById(R.id.txtDescription);
        txtName = (TextView) findViewById(R.id.txtName);
        txtPrice = (TextView) findViewById(R.id.txtPrice);
        delete_Recipe = (Button) findViewById(R.id.delete_Recipe);
        update_Recipe = (Button) findViewById(R.id.update_Recipe);

        update_Recipe.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                startActivity(new Intent(Detail_Activity.this, Upload_Recipe.class)
                        .putExtra("recipeNameKey", txtName.getText().toString())
                        .putExtra("recipeDescriptionKey",  txtDescription.getText().toString())
                        .putExtra("recipePriceKey",  txtPrice.getText().toString())
                        .putExtra("oldimageUrl", imageUrl)
                        .putExtra("key",key)
             );
            }
        });

**这是更新活动..。在此活动中，数据不显示或不显示接收到的数据，而代码是正确的**

public class Update_Activity extends AppCompatActivity {

    ImageView update_Recipe_Image;
    EditText update_Recipe_Name, update_Recipe_Description, update_Recipe_Price;
    Button updatebutton;
    Uri uri;
    ActivityResultLauncher<String> mContent;
    String imageUrl;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_update);

        update_Recipe_Image = (ImageView) findViewById(R.id.update_Recipe_Image);
        update_Recipe_Name = (EditText) findViewById(R.id.update_Recipe_Name);
        update_Recipe_Description = (EditText) findViewById(R.id.update_Recipe_Description);
        update_Recipe_Price = (EditText) findViewById(R.id.update_Recipe_Price);
        updatebutton = (Button) findViewById(R.id.updatebutton);

        Bundle bundle = getIntent().getExtras();
        if (bundle != null){
            Glide.with(Update_Activity.this)
                    .load(bundle.getString("oldimageUrl"))
                    .into(update_Recipe_Image);
            update_Recipe_Name.setText(bundle.getString("recipeNameKey"));
            update_Recipe_Description.setText(bundle.getString("recipeDescriptionKey"));
            update_Recipe_Price.setText(bundle.getString("recipePriceKey"));

        }
    }
}

在logcat.中没有任何错误

Answer 1

startActivity(new Intent(Detail_Activity.this, Upload_Recipe.class)
                        .putExtra("recipeNameKey", txtName.getText().toString())

尝试使用.putExtra创建意图，然后将其作为startActivity的参数。如果您想传递数据以更新活动，则需要给出该活动的目的地，如下所示：

Intent myIntent= new Intent(Detail_Activity.this, Update_Activity.class)
                        .putExtra("recipeNameKey", txtName.getText().toString())
startActivity(myIntent)

Answer 2

您不是在包中传递数据，而是使用intent直接传递数据。因此，您可以在下一个屏幕中接收数据，如下所示：

 if (getIntent() != null){
            Glide.with(Update_Activity.this)
                    .load(getIntent().getStringExtra("oldimageUrl"))
                    .into(update_Recipe_Image);
            update_Recipe_Name.setText(getIntent().getStringExtra("recipeNameKey"));
            update_Recipe_Description.setText(getIntent().getStringExtra("recipeDescriptionKey"));
            update_Recipe_Price.setText(getIntent().getStringExtra("recipePriceKey"));

        }

只需在您的bundle.getString中用getIntent().getStringExtra替换Update_Activity

Answer 3

注这里有3项活动。Detail_Actiivty。Upload_Recipe (它是活动吗？)，Update_Activity。您应该使用目标类创建意图。

Intent intent = new Intent ( DetailActivity.this, Update_Activity.class) ....