Question

我想比较android studio中的两个字符串。我有一个 textfield ，想要将此字符串与给定字符串进行比较。

为了更好的描述，我添加了一张照片。我现有的字符串例如＆＃34; A＆＃34;，我想现在检查，如果文本框包含此值，则按下按钮。

我试过了，但代码中有一个错误，我找不到......

    final TextField textField = (TextField) findViewById(R.id.editText);
    final String text1 = textField.getText().toString();
    final String text2 = "A";


    button2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.v("Button2", "click");
            if(text1.contains(text2)){
                toast.show();
            }
        }
    });

我希望，这可以改善我的第一个（坏）问题！

Answer 1

试试这段代码

public class NewJFrame extends javax.swing.JFrame {

/**
 * Creates new form NewJFrame
 */
public NewJFrame() {
    initComponents();
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    outerPanel = new javax.swing.JPanel();
    listPanel = new javax.swing.JPanel();
    jLabel1 = new javax.swing.JLabel();
    jScrollPane1 = new javax.swing.JScrollPane();
    jList1 = new javax.swing.JList();
    tablePanel = new javax.swing.JPanel();
    jScrollPane2 = new javax.swing.JScrollPane();
    jTable1 = new javax.swing.JTable();
    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    outerPanel.setLayout(new java.awt.BorderLayout());

    jLabel1.setText("Boolean Capability List");

    jList1.setModel(new javax.swing.AbstractListModel() {
        String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 1", "Item 2", "Item 3", "Item 4", "Item 5", " " };
        public int getSize() { return strings.length; }
        public Object getElementAt(int i) { return strings[i]; }
    });
    jScrollPane1.setViewportView(jList1);

    javax.swing.GroupLayout listPanelLayout = new javax.swing.GroupLayout(listPanel);
    listPanel.setLayout(listPanelLayout);
    listPanelLayout.setHorizontalGroup(
        listPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(listPanelLayout.createSequentialGroup()
            .addComponent(jLabel1)
            .addGap(0, 177, Short.MAX_VALUE))
        .addComponent(jScrollPane1)
    );
    listPanelLayout.setVerticalGroup(
        listPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(listPanelLayout.createSequentialGroup()
            .addComponent(jLabel1)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(0, 15, Short.MAX_VALUE))
    );

    outerPanel.add(listPanel, java.awt.BorderLayout.NORTH);

    jTable1.setModel(new javax.swing.table.DefaultTableModel(
        new Object [][] {
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null},
            {null, null, null, null}
        },
        new String [] {
            "Title 1", "Title 2", "Title 3", "Title 4"
        }
    ));
    jScrollPane2.setViewportView(jTable1);

    jButton1.setText("Save Values");

    javax.swing.GroupLayout tablePanelLayout = new javax.swing.GroupLayout(tablePanel);
    tablePanel.setLayout(tablePanelLayout);
    tablePanelLayout.setHorizontalGroup(
        tablePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(tablePanelLayout.createSequentialGroup()
            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 303, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(0, 0, Short.MAX_VALUE))
        .addGroup(tablePanelLayout.createSequentialGroup()
            .addGap(101, 101, 101)
            .addComponent(jButton1)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );
    tablePanelLayout.setVerticalGroup(
        tablePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(tablePanelLayout.createSequentialGroup()
            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 201, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addGap(27, 27, 27)
            .addComponent(jButton1)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

    outerPanel.add(tablePanel, java.awt.BorderLayout.SOUTH);

    getContentPane().add(outerPanel, java.awt.BorderLayout.CENTER);

    pack();
}// </editor-fold>                        

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new NewJFrame().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JList jList1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable1;
private javax.swing.JPanel listPanel;
private javax.swing.JPanel outerPanel;
private javax.swing.JPanel tablePanel;
// End of variables declaration                   
}

Answer 2

我猜你用Button2声明了你的EditText，继续...

您想要检查您提供的字符串和正在写EditText的字符串是否与按下按钮时相同，您的代码是正确的但您需要比较{{的值1}}动态，所以你必须改变这个：

EditText

对此：

            if(text1.contains(text2)){
            toast.show();
        }

希望这有点帮助：）

Answer 3

方法仅包含检查text1是否包含text2。您应该使用equals()方法。

Answer 4

你可以做这样的事情

    final EditText editText = (EditText) findViewById(R.id.editText);
    final String text1 = editText.getText().toString();
    final String text2 = "A";



 button2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.v("Button2", "click");
            System.out.println("text1: " + text1);
            System.out.println("text2: " + text2);
            if (text1.length()>0&&!text1.equalsIgnoreCase("")) {
                if(text1.equalsIgnoreCase(text2)){
                    toast.show();
                }   
            } else {
                System.out.println("text1 is null " );
            }

        }
    });

Answer 5

像这样使用

if (text1.equals(text2)) {
        Toast.makeText(getApplicationContext(), "Equal", Toast.LENGTH_LONG)
                .show();
    }

Answer 6

你需要这样的东西，因为当你比较文本时，你必须有一个更新版本的text.1。

如果你在开头问这个文本，那里面什么都没有。您必须在每个OnClick事件中询问text1。

公开OnClick（查看v）{

   text1 = editText.getText().toString();
   if(text1.equals(text2)){
          //doStufg
   }

}

Answer 7

感谢所有好的和有用的答案！我甚至尝试过某种方式，到目前为止效果很好。谢谢大家在这里。干得好！

// editText.getText（）。toString（）。contains（“A”）;

Android Studio：将现有字符串与TextField.text进行比较

7 个答案: