小编Sri*_*Pai的帖子

我在xml中有6个EditText字段..在按钮上单击我需要验证是否所有EditText都有值或者它是空的.目前我逐个检查每个EditText ..如何一次检查所有.

代码

private Button BtnSave;
 EditText ev_last_name,ev_first_name,ev_email,ev_password,ev_confirm_password,ev_phone;
 String last_name,first_name,email,password,confirm_password,phone;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.signup);
    BtnSave=(Button) findViewById(R.id.BtnSave);
    ev_last_name=(EditText)findViewById(R.id.edit_lname);
    ev_first_name=(EditText)findViewById(R.id.edit_fname);
    ev_email=(EditText)findViewById(R.id.edit_email);
    ev_password=(EditText)findViewById(R.id.edit_passwd);
    ev_confirm_password=(EditText)findViewById(R.id.edit_cpasswd);
    ev_phone=(EditText)findViewById(R.id.edit_phone);



    BtnSave.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
             last_name=ev_last_name.getText().toString();
             first_name=ev_first_name.getText().toString();
             email=ev_email.getText().toString();
             password=ev_password.getText().toString();
             confirm_password=ev_confirm_password.getText().toString();
             phone=ev_phone.getText().toString();

             if ((ev_last_name.getText().toString().length() <= 0))
             {
                 System.out.println(" The EditText is empty");
                 //I will use the toast later
             }


        }
    });


}

嗨,我正在尝试开发一个自定义锁定屏幕,我想在其中替换幻灯片以使用ImageView解锁,如图所示.

这是我到目前为止所尝试的.

我在屏幕的左下角放置了一个Image,并使用onTouchListner在下面拖动Image水平代码.

left_Locker.setOnTouchListener(new OnTouchListener() {

            public boolean onTouch(View v, MotionEvent event) {
                int eid = event.getAction();
                switch (eid) {
                case MotionEvent.ACTION_DOWN:
                    toastText.setVisibility(View.VISIBLE);
                    toastText.setTextColor(Color.BLACK);
                    toastText.setText("Slide to Unlock");
                    break;
                case MotionEvent.ACTION_MOVE:
                    RelativeLayout.LayoutParams mParams = (RelativeLayout.LayoutParams) left_Locker.getLayoutParams();
                    int x = (int) event.getRawX();
                    mParams.leftMargin = x - 50;
                    left_Locker.setLayoutParams(mParams);
                    break;
                case MotionEvent.ACTION_UP:
                        toastText.setVisibility(View.GONE);
                        break;
                default:
                    break;
                }
                return true;
            }
        });

图像确实水平移动,但我正在寻找的是如图所示也可以拖动图像背景.我使用ImageView走在正确的轨道上吗？

下面是我尝试过的Image.

我可以水平移动图像但是如何在滚动时获取背景？

我正在尝试以编程方式从手机中选择可用的联系人,我正在使用以下代码

        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType(ContactsContract.CommonDataKinds.Phone.CONTENT_ITEM_TYPE);
        startActivityForResult(intent, 1);

但问题是如何使用联系人页面中的复选框一次选择多个联系人？

嗨,我正在尝试使用预准备语句将数据插入数据库,但我得到语法错误,请你帮忙

public boolean SignUp(String last_name, String first_name,String email, String password,String confirm_password,String phone){



        Connect connect = new Connect();
        Connection conn = connect.Connection();

        java.sql.PreparedStatement preparedStatement = null;
        //NULL is the column for auto increment
        String insertQuery = "INSERT INTO users VALUES (NULL, ?, ?, ?, ?, ?, ?)";
        preparedStatement = conn.prepareStatement(insertQuery);
        preparedStatement.setString(1, last_name);
        preparedStatement.setString(2, first_name);
        preparedStatement.setString(3, email);
        preparedStatement.setString(4, password);
        preparedStatement.setString(5, confirm_password);
        preparedStatement.setString(6, phone);

        int rs = preparedStatement.executeUpdate(insertQuery);

        conn.close();

}

这是错误消息

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual …

我正在使用foll0wing代码插入数据库,它工作正常,因为我可以看到数据填充在db中,但是我想以编程方式捕获结果,无论是成功还是失败

1)这是要插入的代码

public void SignUp(String last_name, String first_name, String email,
        String password, String confirm_password, String phone) {

    Connect connect = new Connect();
    Connection conn = connect.Connection();
    Statement stmt = conn.createStatement();

    String query = "INSERT INTO users VALUES(NULL,('" + last_name + "'),('"
            + first_name + "'),('" + email + "'),('" + password + "'),('"
            + confirm_password + "'),('" + phone + "'))";
    stmt.executeUpdate(query);
    conn.close();

}

2)这是我用来连接的代码

public Connection Connection() {

    Connection conn = null;

    try {
        String userName = "admin";
        String …

在java.How将sql查询的结果保存到变量中？

        java.sql.PreparedStatement preparedStatement = null;
        String query = "select season from seasonTable where league_name=?";

        preparedStatement = conn.prepareStatement(query);

        preparedStatement.setString(1, league);
        ResultSet rs = preparedStatement.executeQuery();

我需要将检索到的季节保存到变量中,我该怎么做？

我正在使用搜索栏。我只想通过移动拇指来控制它。

如何禁用对 ProgressDrawable 的点击？

我尝试过android:clickable="false"，但没有成功。

我在 XML 中寻找条形码

      <SeekBar
        android:id="@+id/myseek"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:maxHeight="500dp"
        android:minHeight="50dp"
        android:paddingBottom="30dp"
        android:progressDrawable="@drawable/progress_left"
        android:thumb="@drawable/left_unlocker_bkg" >
    </SeekBar>

我的 onSeekChangedListner 的 Seekbar 代码

unlockSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
                    @Override
                    public void onStopTrackingTouch(SeekBar seekBar) {
                        toastText.setVisibility(View.GONE);
                        seekBar.setProgress(0);
                    }

                    @Override
                    public void onStartTrackingTouch(SeekBar seekBar) {

                        if (seekBar.getProgress() < 10) {
                            seekBar.setProgress(0);
                        }
                        toastText.setVisibility(View.VISIBLE);
                        toastText.setText("Slide to Unclock");
                    }

                    @Override
                    public void onProgressChanged(SeekBar seekBar,
                            int progress, boolean fromUser) {

                        if (progress == 100) {
                            Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
                            v.vibrate(100);
                            finish(); …