小编Dav*_*vid的帖子

我在我的应用程序中有这个简单的计时器,每3秒运行一次.如果它不在片段类中,它可以完美地工作.但是在片段中我总是得到错误:只有创建视图层次结构的原始线程才能触及其视图.

timer = new Timer();

timer.schedule(new TimerTask() {

    @Override
    public void run() {
        String timeStamp = new SimpleDateFormat(
                "yyyy.MM.dd HH:mm:ss").format(Calendar
                .getInstance().getTime());
        System.out.println("TimeStamp: " + timeStamp);
        // Read And Write Register Sample
        port = Integer.parseInt(gConstants.port);
        String refe = "0";// HEX Address
        ref = Integer.parseInt(refe, 16);// Hex to int
        count = 10; // the number Address to read
        SlaveAddr = 1;
        astr = gConstants.ip; // Modbus Device

        InetAddress addr;
        try {
            addr = InetAddress.getByName(astr);
            con = new TCPMasterConnection(addr); // the
            // connection …

有没有解决方法如何选择保存文件位置？也许用原始文件浏览器,选择目的地？

谢谢!

是否可以使用MPAndroidChart(或任何其他Android图表库)以渐变颜色填充绘制线下的图表？像这样的东西:

set1.setFillColor(getResources().getColor(R.drawable.chart_fill));

然后在chart_fill.xml:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <gradient
        android:angle="90"
        android:endColor="#FF207a54"
        android:startColor="#FFffffff" />

</shape>

我有这个小gps locaton插入代码但不插入数据库:

db.setVersion(1);
db.setLocale(Locale.getDefault());
db.setLockingEnabled(true);

final String gps = "CREATE TABLE IF NOT EXISTS GPS_Values ("
                + "id INTEGER PRIMARY KEY AUTOINCREMENT, Latitude float(10, 6), Longitude float(10, 6), cur_timestamp TIMESTAMP);";
db.execSQL(gps);

和插入行:

// GPS
public class MyLocationListener implements LocationListener {
    public void onLocationChanged(Location loc) {
        loc.getLatitude();
        loc.getLongitude();

        ContentValues gps_values = new ContentValues();

        gps_values.put("Latitude", loc.getLatitude());
        gps_values.put("Longitutde", loc.getLongitude());


        try {
            db.beginTransaction();
            db.insert("GPS_Values", null, gps_values);
            db.setTransactionSuccessful();
        } finally {
            db.endTransaction();
        }

        String Text = "My current location is: " + "Latitude = " …

我在android中有这个数据库打印机.

Cursor curTAB = myDataBase.rawQuery("SELECT * FROM  GPS_Values;", null);

Integer count = 0;
while (curTAB.moveToNext()) {
    String s_latitude = curTAB.getString(1);
    String s_longitude = curTAB.getString(2);
    String s_speed = curTAB.getString(5);
    count++;

    String next_speed = ???

}
curTAB.close();
myDataBase.close();

我想知道如何在循环中获得下一个速度？