我正在尝试获取笔记本电脑的可用显示模式列表。我正在运行以下代码：
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice display = ge.getDefaultScreenDevice();
DisplayMode[] availableModes = display.getDisplayModes();
这将返回112种可能的显示模式。当我打印列表但是我可以看到很多双打。所有大多数显示模式都打印3次。有人知道这个的原因吗？
亲切的问候
答案 0 :(得分：0)
请使用此代码尝试
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class DisplayModeModel extends DefaultTableModel {
private static final long serialVersionUID = 1L;
private DisplayMode[] modes;
public DisplayModeModel(DisplayMode[] modes) {
this.modes = modes;
}
public DisplayMode getDisplayMode(int r) {
return modes[r];
}
@Override
public String getColumnName(int c) {
return DisplayModeTest.COLUMN_NAMES[c];
}
@Override
public int getColumnCount() {
return DisplayModeTest.COLUMN_WIDTHS.length;
}
@Override
public boolean isCellEditable(int r, int c) {
return false;
}
@Override
public int getRowCount() {
if (modes == null) {
return 0;
}
return modes.length;
}
@Override
public Object getValueAt(int rowIndex, int colIndex) {
DisplayMode dm = modes[rowIndex];
switch (colIndex) {
case DisplayModeTest.INDEX_WIDTH:
return Integer.toString(dm.getWidth());
case DisplayModeTest.INDEX_HEIGHT:
return Integer.toString(dm.getHeight());
case DisplayModeTest.INDEX_BITDEPTH: {
int bitDepth = dm.getBitDepth();
String ret;
if (bitDepth == DisplayMode.BIT_DEPTH_MULTI) {
ret = "Multi";
} else {
ret = Integer.toString(bitDepth);
}
return ret;
}
case DisplayModeTest.INDEX_REFRESHRATE: {
int refreshRate = dm.getRefreshRate();
String ret;
if (refreshRate == DisplayMode.REFRESH_RATE_UNKNOWN) {
ret = "Unknown";
} else {
ret = Integer.toString(refreshRate);
}
return ret;
}
}
throw new ArrayIndexOutOfBoundsException("Invalid column value");
}
}
class DisplayModeTest extends JFrame implements ActionListener, ListSelectionListener {
private static final long serialVersionUID = 1L;
private boolean waiting = false;
private GraphicsDevice device;
private DisplayMode originalDM;
private JButton exit = new JButton("Exit");
private JButton changeDM = new JButton("Set Display");
private JLabel currentDM = new JLabel();
private JTable dmList = new JTable();
private JScrollPane dmPane = new JScrollPane(dmList);
private boolean isFullScreen = false;
public static final int INDEX_WIDTH = 0;
public static final int INDEX_HEIGHT = 1;
public static final int INDEX_BITDEPTH = 2;
public static final int INDEX_REFRESHRATE = 3;
public static final int[] COLUMN_WIDTHS = new int[]{
100, 100, 100, 100
};
public static final String[] COLUMN_NAMES = new String[]{
"Width", "Height", "Bit Depth", "Refresh Rate"
};
public DisplayModeTest(GraphicsDevice device) {
super(device.getDefaultConfiguration());
this.device = device;
setTitle("Display Mode Test");
originalDM = device.getDisplayMode();
setDMLabel(originalDM);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// Make sure a DM is always selected in the list
exit.addActionListener(this);
changeDM.addActionListener(this);
changeDM.setEnabled(device.isDisplayChangeSupported());
}
@Override
public void actionPerformed(ActionEvent ev) {
Object source = ev.getSource();
if (source == exit) {
device.setDisplayMode(originalDM);
System.exit(0);
} else { // if (source == changeDM)
int index = dmList.getSelectionModel().getAnchorSelectionIndex();
if (index >= 0) {
DisplayModeModel model = (DisplayModeModel) dmList.getModel();
DisplayMode dm = model.getDisplayMode(index);
device.setDisplayMode(dm);
setDMLabel(dm);
setSize(new Dimension(dm.getWidth(), dm.getHeight()));
validate();
}
}
}
@Override
public void valueChanged(ListSelectionEvent ev) {
changeDM.setEnabled(device.isDisplayChangeSupported());
}
private void initComponents(Container c) {
setContentPane(c);
c.setLayout(new BorderLayout());
JPanel currentPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));// Current DM
c.add(currentPanel, BorderLayout.NORTH);
JLabel current = new JLabel("Current Display Mode : ");
currentPanel.add(current);
currentPanel.add(currentDM);
JPanel modesPanel = new JPanel(new GridLayout(1, 2));// Display Modes
c.add(modesPanel, BorderLayout.CENTER);
for (int i = 0; i < COLUMN_WIDTHS.length; i++) { // List of display modes
TableColumn col = new TableColumn(i, COLUMN_WIDTHS[i]);
col.setIdentifier(COLUMN_NAMES[i]);
col.setHeaderValue(COLUMN_NAMES[i]);
dmList.addColumn(col);
}
dmList.getSelectionModel().setSelectionMode( ListSelectionModel.SINGLE_SELECTION);
dmList.getSelectionModel().addListSelectionListener(this);
modesPanel.add(dmPane);
JPanel controlsPanelA = new JPanel(new BorderLayout());// Controls
modesPanel.add(controlsPanelA);
JPanel controlsPanelB = new JPanel(new GridLayout(2, 1));
controlsPanelA.add(controlsPanelB, BorderLayout.NORTH);
JPanel exitPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));// Exit
controlsPanelB.add(exitPanel);
exitPanel.add(exit);
JPanel changeDMPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));// Change DM
controlsPanelB.add(changeDMPanel);
changeDMPanel.add(changeDM);
controlsPanelA.add(new JPanel(), BorderLayout.CENTER);
}
@Override
public void setVisible(boolean isVis) {
super.setVisible(isVis);
if (isVis) {
dmList.setModel(new DisplayModeModel(device.getDisplayModes()));
}
}
private void setDMLabel(DisplayMode newMode) {
int bitDepth = newMode.getBitDepth();
int refreshRate = newMode.getRefreshRate();
String bd, rr;
if (bitDepth == DisplayMode.BIT_DEPTH_MULTI) {
bd = "Multi";
} else {
bd = Integer.toString(bitDepth);
}
if (refreshRate == DisplayMode.REFRESH_RATE_UNKNOWN) {
rr = "Unknown";
} else {
rr = Integer.toString(refreshRate);
}
currentDM.setText(
COLUMN_NAMES[INDEX_WIDTH] + ": " + newMode.getWidth() + " "
+ COLUMN_NAMES[INDEX_HEIGHT] + ": " + newMode.getHeight() + " "
+ COLUMN_NAMES[INDEX_BITDEPTH] + ": " + bd + " "
+ COLUMN_NAMES[INDEX_REFRESHRATE] + ": " + rr);
}
public void begin() {
isFullScreen = device.isFullScreenSupported();
setUndecorated(isFullScreen);
setResizable(!isFullScreen);
if (isFullScreen) {
device.setFullScreenWindow(this); // Full-screen mode
validate();
} else {
pack();// Windowed mode
setVisible(true);
}
}
public static void main(String[] args) {
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] devices = env.getScreenDevices();
// REMIND : Multi-monitor full-screen mode not yet supported
for (int i = 0; i < 1 /* devices.length */; i++) {
DisplayModeTest test = new DisplayModeTest(devices[i]);
test.initComponents(test.getContentPane());
test.begin();
}
}
}