我们可以使用“registerForActivityResult”发送和获取“requestCode”吗？

Question

因为startActivityForResult已被弃用。所以我替换startActivityForResult为registerForActivityResult

这是我的代码：

ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            new ActivityResultCallback<ActivityResult>() {
                @Override
                public void onActivityResult(ActivityResult result) {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        // There are no request codes
                        //Intent data = result.getData();
                        //doSomeOperations();
                    }
                }
            });

因为我调用了多个 Activity：

旧版本：

 Intent myinten = new Intent(MainActivity.this, MainActivity2.class);
 startActivityForResult(myinten, 111);

Intent myinten = new Intent(MainActivity.this, MainActivity3.class);
startActivityForResult(myinten, 222);

新版本：

Intent myinten = new Intent(MainActivity.this, MainActivity2.class);
someActivityResultLauncher.launch(myinten);

Intent myinten = new Intent(MainActivity.this, MainActivity3.class);
someActivityResultLauncher.launch(myinten);

我们可以使用“registerForActivityResult”发送和获取“requestCode”吗？

Answer 1

为每次启动创建一个新的 ActivityResultLauncher，或者在启动活动时在包中传递您自己的标识符。

 ActivityResultLauncher<Intent> someActivityResultLauncher = registerForActivityResult(
            new ActivityResultContracts.StartActivityForResult(),
            new ActivityResultCallback<ActivityResult>() {
                @Override
                public void onActivityResult(ActivityResult result) {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        Intent intent = result.getData();
                        //get your "requestCode" here with switch for "SomeUniqueID"
                    }
                }
            });

启动活动

Intent myinten = new Intent(MainActivity.this, MainActivity2.class);
myinten.putExtra("requestCode", "SomeUniqueID");
someActivityResultLauncher.launch(myinten);

返回的活动

Intent intent = new Intent();
//these should not be hard coded, but retrieved from the intent which created this activity
intent.putExtra("requestCode", "SomeUniqueID");
activity.setResult(Activity.RESULT_OK, intent);
activity.finish();