Question

我是初学者。我有从编辑视图中获取文本字符串的问题。请帮我修理一下。非常感谢。 CommentActivity.java

public class CommentActivity extends Fragment  {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }
    TextView cmt;
    ArrayAdapter<String> adapter;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.comment_layout, container, false);
        Button send = (Button) v.findViewById(R.id.send_comment);
        cmt = (TextView) v.findViewById(R.id.text_comment);
        ListView lst = (ListView) v.findViewById(R.id.list_comments);
        String[] values = new String[] {};
        adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1, values);
        lst.setAdapter(adapter);
        send.setOnClickListener(new View.OnClickListener()
                {
               public void onClick(View v)
               {
                   CharSequence content = cmt.getText();
                   cmt.setText("");
                   adapter.add((String) content);
                   adapter.notifyDataSetChanged();
                   Toast.makeText(getActivity(), content, Toast.LENGTH_SHORT).show();
               }
            });
        return v;
    }
}

错误：

12-11 16:39:10.244: E/PlayerDetailActivity(25813): Uncaught exception
12-11 16:39:10.244: E/PlayerDetailActivity(25813): java.lang.ClassCastException: android.text.SpannableStringBuilder
cannot be cast to java.lang.String
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at RanhTV.Controller.CommentActivity$1.onClick(CommentActivity.java:36)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at android.view.View.performClick(View.java:4424)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at android.view.View$PerformClick.run(View.java:18383)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at android.os.Handler.handleCallback(Handler.java:733)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at android.os.Handler.dispatchMessage(Handler.java:95)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at android.os.Looper.loop(Looper.java:137)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at android.app.ActivityThread.main(ActivityThread.java:4998)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at java.lang.reflect.Method.invokeNative(Native Method)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at java.lang.reflect.Method.invoke(Method.java:515)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
12-11 16:39:10.244: E/PlayerDetailActivity(25813):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

刚刚放

adapter.add(String.valueOf(cmt.getText());

Answer 2

String content = cmt.getText().toString();
cmt.setText("");
adapter.add(content);

Answer 3

您可以尝试如下：

adapter.add(content.toString());

Answer 4

试试这个：

StringBuilder sb = new StringBuilder(content.length()); sb.append(content); adapter.add(sb.toString());

Answer 5

应该是这样的，

  String content = cmt.getText().toString();
   adapter.add(content);

从edittext android获取字符串错误

5 个答案: