Question

我正在尝试运行下面应该显示背景颜色PINK和字符串的程序“这是一个测试。”在白色

1）Test.java

TextToSpeech ttsObject;

private List<WordListModel> mWordList;
private Context context;
private Activity activity;
private int result;

public WordListAdapter(TextToSpeech ttsObject, int result) {
    this.ttsObject = ttsObject;
    this.result = result;
}

public WordListAdapter(List<WordListModel> mWordList, Context context, TextToSpeech ttsObject, int result) {
    this.mWordList = mWordList;
    this.context = context;
    activity = (Activity)context;
    this.result = result;
    this.ttsObject = ttsObject;
}

@Override
public WordListViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.word_list_layout,parent,false);

    return new WordListViewHolder(view);
}

@Override
public void onBindViewHolder(final WordListViewHolder holder, final int position) {

    final WordListModel wordmeaning = mWordList.get(position);
    holder.mNameTv.setText(wordmeaning.getmWord());
    holder.mNameTv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            if (result == TextToSpeech.LANG_NOT_SUPPORTED || result == TextToSpeech.LANG_MISSING_DATA){
                Toast.makeText(activity,"Feature Not Support in your Device",Toast.LENGTH_LONG).show();
            }else {
                ttsObject.speak(wordmeaning.getmWord(), TextToSpeech.QUEUE_FLUSH, null);
            }
        }
    });
    holder.mMeaningTv.setText(wordmeaning.getmMeaning());
    holder.mMeaningTv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (result == TextToSpeech.LANG_NOT_SUPPORTED || result == TextToSpeech.LANG_MISSING_DATA){
                Toast.makeText(activity,"Feature Not Support in your Device",Toast.LENGTH_LONG).show();
            }else {
                ttsObject.speak(wordmeaning.getmMeaning(), TextToSpeech.QUEUE_FLUSH, null);
            }
        }
    });

    holder.mFavIv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            DatabaseHelper mydb = new DatabaseHelper(context);

            try {
                if (wordmeaning.getIsFav().equals("false")){
                    boolean check = mydb.updateData("true",wordmeaning.getmWord(),wordmeaning.getDbTable());
                    if (check){
                        holder.mFavIv.setImageResource(R.drawable.ic_star_black_24dp);
                        wordmeaning.setIsFav("true");
                    }
                    Log.d("TAG",Boolean.toString(check));
                }else {
                    boolean check = mydb.updateData("false",wordmeaning.getmWord(),wordmeaning.getDbTable());
                    if (check){
                        holder.mFavIv.setImageResource(R.drawable.ic_star_border_black_24dp);
                        wordmeaning.setIsFav("false");
                    }
                    Log.d("TAG",Boolean.toString(check));
                }
            }catch (Exception e){
                Log.d("TAG",e.toString());
            }

        }
    });

    if (wordmeaning.getIsFav().equals("false")){
        holder.mFavIv.setImageResource(R.drawable.ic_star_border_black_24dp);
    }else {
        holder.mFavIv.setImageResource(R.drawable.ic_star_black_24dp);
    }

}

@Override
public int getItemCount() {
    return mWordList.size();
}

2）Screen.java

package Practice;

import java.awt.*;
import javax.swing.JFrame;

public class Test extends JFrame{

    public static void main(String[] args){

        DisplayMode dm = new DisplayMode(800,600,16,DisplayMode.REFRESH_RATE_UNKNOWN);
        Test test = new Test();
        test.run(dm);
    }

    public void run(DisplayMode dm){

        setBackground(Color.PINK);
        setForeground(Color.WHITE);
        setFont(new Font("Arial", Font.PLAIN, 24));

        Screen s = new Screen();

        try{
            s.setFullScreen(dm, this);
            try{
                Thread.sleep(5000);
            }catch(Exception ex){
                ex.printStackTrace();
            }
        }finally{
            s.restoreScreen();
        }

    }

    public void paint(Graphics g){

        g.drawString("This is a test.", 200, 200);
    }
}

预期结果：

全屏显示背景颜色PINK和字符串“这是一个测试。”在白色

实际结果：

全屏显示背景颜色BLACK和String“这是一个测试。”在怀特。

我在Windows机器上的eclipse中运行它。

Answer 1

正如我在第一条评论中所说，你应该做很多事情：

您不应直接使用JFrame进行自定义绘画。相反，请使用JPanel。在这种情况下也无需扩展JFrame，您不会添加任何功能。
要更改框架的背景颜色，最好设置框架内容窗格的背景颜色。另外，要更改用于绘制字符串的颜色，您应该调用Graphics.setColor ()。
不要覆盖paint方法。相反，请覆盖JComponent's paintComponent方法。此外，方法中的第一行应调用父绘制方法，以允许组件在执行任何其他操作之前正常绘制自己。

最后，你不清楚你想在Screen课程中做什么，但是调用Thread.sleep实际上是一种不好的做法，对我来说，所有代码都没有多大意义。

启用全屏模式的最佳方法是在您的相框上调用setExtendedState (JFrame.MAXIMIZED_BOTH)。

这是我所说的一个有效例子：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
public class Test
{
    public static void main (String [] a) {
        SwingUtilities.invokeLater (new Runnable () {
            @Override public void run () {
                createAndShowGUI ();
            }
        });
    }
    private static void createAndShowGUI () {
        JFrame frame = new JFrame ("App");
        frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        frame.setContentPane (new DrawPanel (Color.PINK, Color.WHITE));
        frame.pack ();
        // frame.setExtendedState (JFrame.MAXIMIZED_BOTH); // You can use this instruction to have full screen mode.
        frame.setLocationRelativeTo (null);
        frame.setVisible (true);
    }
}
class DrawPanel extends JPanel
{
    Color foregroundColor;

    public DrawPanel (Color backgroundColor, Color foregroundColor) {
        setBackground (backgroundColor);
        this.foregroundColor = foregroundColor;
    }
    @Override public Dimension getPreferredSize () {
        return new Dimension (400, 400);
    }
    @Override protected void paintComponent (Graphics g) {
        super.paintComponent (g);
        g.setColor (foregroundColor);
        g.setFont (new Font ("Arial", Font.PLAIN, 24));
        g.drawString ("This is a test.", 200, 200);
    }
}

截图：

java.awt.Frame.setBackground（Color arg0）不显示PINK颜色

1 个答案: