Question

我想将字符串数据从活动发送到片段，但它总是会出错。我检查了下面的链接并尝试了它们，但仍然相同。

send data from activity to fragment android studio Send data from activity to fragment in Android

我的代码如下，myActivity.kt（我没有删除注释行，我也尝试过它们）

img_foto1.setOnClickListener {

        val bundle = Bundle()
        bundle.putString("imgviewname", "img_foto1")
        val fraginfo = adsCameraOrGallery()
        fraginfo.arguments = bundle

        //val imgviewBundle = Bundle()
        //imgviewBundle.putString("coba", "img_foto1")
        //imgviewBundle.putSerializable("modelassign", "test")
        //val fragmentObj = adsCameraOrGallery()
        //fragmentObj.setArguments(imgviewBundle)

        //val transactionData: FragmentTransaction = supportFragmentManager.beginTransaction()
        //transactionData.add(0, fragmentObj, "viewtaskfragment")
        //transactionData.commit()

        //val transactionData: FragmentTransaction = supportFragmentManager.beginTransaction()
        //transactionData.add(0, fraginfo, "viewtaskfragment")

        //transactionData.commit()


        var dialog = adsCameraOrGallery()
        dialog.show(supportFragmentManager,"Choose photo")

    }

片段类如下：

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {


    var args : Bundle = Bundle()
    var dataFromActivity = args.getBundle("imgviewname")
    var temp = args.getString("imgviewname")

    //comingData = this!!.arguments!!.getString("imgviewname")
             }

因此从片段来看，以上两行的数据均为空。没有来自活动的数据。

如果我在片段中使用下面的行，则这次我收到“ KotlinNullPointerException”错误。

ComingDataFromActivity = this!!.arguments!!.getString("imgviewname")

我该怎么做？谢谢。

关于@Mike的建议，这些行情对我有用，更新了帖子。

活动；

img_foto1.setOnClickListener {

        val bundle = Bundle()
        bundle.putString("imgviewname", "img_foto1")
        val fraginfo = adsCameraOrGallery()
        fraginfo.arguments = bundle

        var dialog = adsCameraOrGallery()
        dialog.arguments =bundle

        dialog.show(supportFragmentManager,"Choose foto")
    }

片段；

    var comingData = this!!.arguments!!.getString("imgviewname")

Answer 1

Bundle bundle = new Bundle();
bundle.putString("key", "test");
// set Fragmentclass Arguments
Fragmentclass fragobj = new Fragmentclass();
fragobj.setArguments(bundle);

以及在片段的onCreateView方法中：

String strtext = getArguments().getString("key");

Answer 2

尝试使用界面访问数据。在课堂上您想使用数据的地方

area

class A implement PassDataListener{
String str=null;
//PASS CONTEXT TO OF LISTENER TO CLASS WHERE YOU WANT TO GET DATA
B b=new B(A.this);

@override
public void getString(String text){
this.str=text;
}
}

interface PassDataListener{
void getString(String a);
}

Answer 3

在您的活动中：-

 Intent intent = new Intent(getContext(), SearchContact.class);
 Bundle a = new Bundle();
        a.putString("key", "text");
        intent.putExtra("model1", a);
        startActivity(intent);

在您的片段中：-

Intent intent = getIntent();
Bundle bundle = intent.getString("model1");

尝试一下可能会对您有所帮助。

Answer 4

在您的活动中，

Bundle bundle = new Bundle();
 String text = "Here is my text";
 bundle.putString("text", text );
 FragmentClass fragment = new FragmentClass();
 fragment.setArguments(bundle);
 transaction.replace(R.id.fragment, fragment);
 transaction.commit();

在您的片段中

@Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    String myText = this.getArguments().getString("text");

 }

如何将字符串数据从活动发送到片段

4 个答案: