Question

我有几个listview项，当我单击特定的listview时，需要使用被单击的listview值转到Fragment_2。我在Fragment_1上尝试下面的代码，我得到了正确的值，它在Tosat通知中显示，但是在Fragment_2包中始终为null。

在Fragment_1的onCreate方法中

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                String value = ((TextView) view.findViewById(R.id.username)).getText().toString();
                MainFragment fragment = new MainFragment ();
                Bundle bundle = new Bundle();
                bundle.putString("view", value);
                Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();
                fragment.setArguments(bundle);

在Fragment_2的onCreate方法中

 Bundle bundle = this.getArguments();
        if (bundle != null) {
            String myString = bundle.getString("view");
            Toast.makeText(getContext(), myString, Toast.LENGTH_SHORT).show();

UDPATE ：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                String value = ((TextView) view.findViewById(R.id.username)).getText().toString();
                MainFragment fragment = new MainFragment ();
                Bundle bundle = new Bundle();
                bundle.putString("view", value);
                Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();
                fragment.setArguments(bundle);

                if (position == 0) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);

                }

                if (position == 1) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);
                }

                if (position == 2) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);
                }

                if (position == 3) {
                    Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                    startActivityForResult(myIntent, 0);
                }

                            // ETC .......
            }
        });

Answer 1

只需替换onItemClick方法中的以下代码即可。

            String value = ((TextView) 
            view.findViewById(R.id.username)).getText().toString();
            Bundle bundle = new Bundle();
            bundle.putString("view", value);
            Intent myIntent = new Intent(view.getContext(), MainActivity.class);
            myIntent.putExtra(bundle);
            startActivityForResult(myIntent, 0);

在MainActivity上，像这样替换MainFragment，

            MainFragment fragment = new MainFragment ();
            fragment.setArguments(getIntent().getExtras());

            getSupportFragmentManager()
              .beginTransaction()
              .replace("your fragment container id here", fragment)
              .commit();

Answer 2

您没有提交片段

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                String value = ((TextView) view.findViewById(R.id.username)).getText().toString();
                MainFragment fragment = new MainFragment ();
                Bundle bundle = new Bundle();
                bundle.putString("view", value);
                Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();
                fragment.setArguments(bundle);

// This line is important
getSupportFragmentManager().beginTransaction().add(R.id.container, fragment).commit();

Answer 3

您正在启动活动“ MainActivity.class”，并将捆绑软件传递给Fragment类“ MainFragment”，但从未真正启动MainFragment。因此，很明显，您的代码无法正常工作

Answer 4

您正在调用活动，以便如何获取片段中的数据以及如果您这样做：

首先，您要以此启动

  Intent myIntent = new Intent(view.getContext(), MainActivity.class);
                startActivityForResult(myIntent, 0);

然后在此活动中，您将启动片段

getFragmentManager().beginTransaction().replace("your fragment container id here", 
fragment).commit();

在这种情况下，首先将数据传递给意图

  Intent myIntent = new Intent(view.getContext(), MainActivity.class);
     myIntent.putString("data","Put the data which you want to pass");
                startActivityForResult(myIntent, 0);

并使用包将此数据传递给片段希望它对您有用。

如何将数据从列表视图从一个片段发送到另一个

4 个答案: