从OnActivityResult获取内容

// 调用方的Activity
public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_CODE = 1;

    // 启动目标Activity
    private void startTargetActivity() {
        Intent intent = new Intent(this, TargetActivity.class);
        startActivityForResult(intent, REQUEST_CODE);
    }

    // 处理返回的结果
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE) {
            if (resultCode == RESULT_OK) {
                // 获取返回的内容
                String result = data.getStringExtra("result");
                // 处理返回的内容
                // ...
            } else if (resultCode == RESULT_CANCELED) {
                // 处理取消操作
                // ...
            }
        }
    }
}

// 目标Activity
public class TargetActivity extends AppCompatActivity {
    // 返回结果并关闭Activity
    private void returnResult() {
        Intent intent = new Intent();
        intent.putExtra("result", "Hello, World!");
        setResult(RESULT_OK, intent);
        finish();
    }
}