在实现onClickListener时尝试获取按钮文本

Question

我是android的新手，所以我希望我听起来不会太笨，也就是说，我做了一个片段，专门为XML中的按钮实现了OnclickListener。我需要默认的onclick函数来将按钮的文本保存为字符串，但是我还没有弄清楚如何从视图中检索按钮的文本。这将帮助我为我要做的每一个按钮做一个if语句。有什么建议吗？

import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.support.v4.app.Fragment;

public class Section1Fragment extends Fragment implements View.OnClickListener {
    private static final String TAG = "Section1Fragment";

    Button btnItem1;
    Button btnItem2;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable final ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.section1,container,false);

        btnItem1 = (Button) view.findViewById(R.id.btnItem1);
        btnItem1.setOnClickListener(this);
        btnItem2 = (Button) view.findViewById(R.id.btnItem2);
        btnItem2.setOnClickListener(this);
        return view;
    }

    @Override
    public void onClick(View view) {
        if (view == btnItem1) {
            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            builder.setMessage("button 1")
                    .setNegativeButton("Retry", null)
                    .create()
                    .show();
        }
        else if (view == btnItem2) {
            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            builder.setMessage("button 2")
                    .setNegativeButton("Retry", null)
                    .create()
                    .show();
        }
    }
}

Answer 1

首先，您要正确声明按钮，所以进入xml文件，并确保button有一个ID。您可以通过在按钮中执行以下操作来添加ID:android:ID=“@+ID/button”

然后在Java代码文件中，你要这样声明：

final Button button = (Button) findViewById(R.id.button)

Answer 2

您需要调用view.getText（）.toString（）来获取视图的文本值。下面是示例代码。

 @Override
public void onClick(View view) {
    if (view == btnItem1) {
        Toast.makeText(getActivity(), btnItem1.getText().toString(), Toast.LENGTH_SHORT).show();

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage("button 1")
                .setNegativeButton("Retry", null)
                .create()
                .show();
    }
    else if (view == btnItem2) {
        Toast.makeText(getActivity(), btnItem1.getText().toString(), Toast.LENGTH_SHORT).show();

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage("button 2")
                .setNegativeButton("Retry", null)
                .create()
                .show();
    }
}