android - 如何将存储在数据库中的 Listview 中的值获取到另一个 Activity ？使用Android和Mysql

Question

这里我使用带有 mysql 数据库的 Android。我已经创建了表，并且还将值存储到数据库中。它也显示在 ListView 中，但是当我尝试单击 ListView 中的项目时。它不会去其他 Activity 。请帮帮我。

这是我在适配器中的代码

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = getLayoutInflater();
        View listViewItem = inflater.inflate(R.layout.list_view_entries, null, true);

        TextView tvTitleEntry = listViewItem.findViewById(R.id.tvTitleEntry);
        TextView tvCityEntry = listViewItem.findViewById(R.id.tvCityEntry);

        final Entry entry = entryList.get(position);

        tvTitleEntry.setText(entry.getTitle());
        tvCityEntry.setText(entry.getCity());

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String title = ((TextView) view).getText().toString();
                Intent i = new Intent(getApplicationContext(), ViewEntry.class);
                i.putExtra("title", title);
                startActivity(i);
            }
        });

        return listViewItem;
    }
}

另一个 Activity (ViewEntry 类)代码

    TextView tvTitle = (TextView) findViewById(R.id.tvTitle);
    Intent i = getIntent();
    String title = i.getStringExtra("title");
    tvTitle.setText(title);

日志猫

java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
                                                                                               at com.example.arko.torranboapplicationentry.EntriesActivity$EntryAdapter$1.onItemClick(EntriesActivity.java:125)
                                                                                               at android.widget.AdapterView.performItemClick(AdapterView.java:305)
                                                                                               at android.widget.AbsListView.performItemClick(AbsListView.java:1146)
                                                                                               at android.widget.AbsListView$PerformClick.run(AbsListView.java:3057)
                                                                                               at android.widget.AbsListView$3.run(AbsListView.java:3864)
                                                                                               at android.os.Handler.handleCallback(Handler.java:739)
                                                                                               at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                               at android.os.Looper.loop(Looper.java:135)
                                                                                               at android.app.ActivityThread.main(ActivityThread.java:5268)
                                                                                               at java.lang.reflect.Method.invoke(Native Method)
                                                                                               at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902)
                                                                                               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:697)

我该如何解决这个问题？

Answer 1

String title = ((TextView) view).getText().toString();

在这一行中，您尝试将 ListView 项的 View 转换为 TextView ，这会引发异常。

将其更改为onclicklistener，并从 ListView 项的 View 中获取textview

 listViewItem.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
                String title = ((TextView)v.findViewById(R.id.tvTitleEntry)).getText().toString();
                Intent i = new Intent(getApplicationContext(), ViewEntry.class);
                i.putExtra("title", title);
                context.startActivity(i);
            }
        });