android滚动选择
1. 安卓手机怎么滚动截长图
要看你手机支不支持截长图了，现在的安卓手机一般都支持，截图一下，然后图片会停留一两秒在边上，你直接点一下那个图，出来后，有提示截长图的。望采纳！
2. android 滚轮选择控件有哪些框架
android 滚轮选择控件是ios独有的一个控件，android还没有原生的，不过网上有一个仿照小米的滚轮字的字的自定义view，你可以到csdn下载频道搜搜看，是我上传的
3. android listview 当选中一个item的时候就把这个item滚动到顶端。
listview.smoothScrollToPositonFromTop(position, 0, 60); 三个参数分别是选择的position，滚动后到顶部的距离，用时多少ms。
4. android自定义时间选择器，滑动选择日期，智能判断每月多少天
自定义一个类：
/DateTimePicker/src/com/wwj/datetimepicker/DateTimePickDialogUtil.java
[java] view plain
package com.wwj.datetimepicker;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;
/**
* 日期时间选择控件 使用方法： private EditText inputDate;//需要设置的日期时间文本编辑框 private String
* initDateTime="2012年9月3日 14:44",//初始日期时间值 在点击事件中使用：
* inputDate.setOnClickListener(new OnClickListener() {
*
* @Override public void onClick(View v) { DateTimePickDialogUtil
* dateTimePicKDialog=new
* DateTimePickDialogUtil(SinvestigateActivity.this,initDateTime);
* dateTimePicKDialog.dateTimePicKDialog(inputDate);
*
* } });
*
* @author
*/
public class DateTimePickDialogUtil implements OnDateChangedListener,
OnTimeChangedListener {
private DatePicker datePicker;
private TimePicker timePicker;
private AlertDialog ad;
private String dateTime;
private String initDateTime;
private Activity activity;
/**
* 日期时间弹出选择框构造函数
*
* @param activity
* ：调用的父activity
* @param initDateTime
* 初始日期时间值，作为弹出窗口的标题和日期时间初始值
*/
public DateTimePickDialogUtil(Activity activity, String initDateTime) {
this.activity = activity;
this.initDateTime = initDateTime;
}
public void init(DatePicker datePicker, TimePicker timePicker) {
Calendar calendar = Calendar.getInstance();
if (!(null == initDateTime || "".equals(initDateTime))) {
calendar = this.getCalendarByInintData(initDateTime);
} else {
initDateTime = calendar.get(Calendar.YEAR) + "年"
+ calendar.get(Calendar.MONTH) + "月"
+ calendar.get(Calendar.DAY_OF_MONTH) + "日 "
+ calendar.get(Calendar.HOUR_OF_DAY) + ":"
+ calendar.get(Calendar.MINUTE);
}
datePicker.init(calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH),
calendar.get(Calendar.DAY_OF_MONTH), this);
timePicker.setCurrentHour(calendar.get(Calendar.HOUR_OF_DAY));
timePicker.setCurrentMinute(calendar.get(Calendar.MINUTE));
}
/**
* 弹出日期时间选择框方法
*
* @param inputDate
* :为需要设置的日期时间文本编辑框
* @return
*/
public AlertDialog dateTimePicKDialog(final EditText inputDate) {
LinearLayout dateTimeLayout = (LinearLayout) activity
.getLayoutInflater().inflate(R.layout.common_datetime, null);
datePicker = (DatePicker) dateTimeLayout.findViewById(R.id.datepicker);
timePicker = (TimePicker) dateTimeLayout.findViewById(R.id.timepicker);
init(datePicker, timePicker);
timePicker.setIs24HourView(true);
timePicker.setOnTimeChangedListener(this);
ad = new AlertDialog.Builder(activity)
.setTitle(initDateTime)
.setView(dateTimeLayout)
.setPositiveButton("设置", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
inputDate.setText(dateTime);
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
inputDate.setText("");
}
}).show();
onDateChanged(null, 0, 0, 0);
return ad;
}
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
onDateChanged(null, 0, 0, 0);
}
public void onDateChanged(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
// 获得日历实例
Calendar calendar = Calendar.getInstance();
calendar.set(datePicker.getYear(), datePicker.getMonth(),
datePicker.getDayOfMonth(), timePicker.getCurrentHour(),
timePicker.getCurrentMinute());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm");
dateTime = sdf.format(calendar.getTime());
ad.setTitle(dateTime);
}
/**
* 实现将初始日期时间2012年07月02日 16:45 拆分成年 月 日 时 分 秒,并赋值给calendar
*
* @param initDateTime
* 初始日期时间值 字符串型
* @return Calendar
*/
private Calendar getCalendarByInintData(String initDateTime) {
Calendar calendar = Calendar.getInstance();
// 将初始日期时间2012年07月02日 16:45 拆分成年 月 日 时 分 秒
String date = spliteString(initDateTime, "日", "index", "front"); // 日期
String time = spliteString(initDateTime, "日", "index", "back"); // 时间
String yearStr = spliteString(date, "年", "index", "front"); // 年份
String monthAndDay = spliteString(date, "年", "index", "back"); // 月日
String monthStr = spliteString(monthAndDay, "月", "index", "front"); // 月
String dayStr = spliteString(monthAndDay, "月", "index", "back"); // 日
String hourStr = spliteString(time, ":", "index", "front"); // 时
String minuteStr = spliteString(time, ":", "index", "back"); // 分
int currentYear = Integer.valueOf(yearStr.trim()).intValue();
int currentMonth = Integer.valueOf(monthStr.trim()).intValue() - 1;
int currentDay = Integer.valueOf(dayStr.trim()).intValue();
int currentHour = Integer.valueOf(hourStr.trim()).intValue();
int currentMinute = Integer.valueOf(minuteStr.trim()).intValue();
calendar.set(currentYear, currentMonth, currentDay, currentHour,
currentMinute);
return calendar;
}
/**
* 截取子串
*
* @param srcStr
* 源串
* @param pattern
* 匹配模式
* @param indexOrLast
* @param frontOrBack
* @return
*/
public static String spliteString(String srcStr, String pattern,
String indexOrLast, String frontOrBack) {
String result = "";
int loc = -1;
if (indexOrLast.equalsIgnoreCase("index")) {
loc = srcStr.indexOf(pattern); // 取得字符串第一次出现的位置
} else {
loc = srcStr.lastIndexOf(pattern); // 最后一个匹配串的位置
}
if (frontOrBack.equalsIgnoreCase("front")) {
if (loc != -1)
result = srcStr.substring(0, loc); // 截取子串
} else {
if (loc != -1)
result = srcStr.substring(loc + 1, srcStr.length()); // 截取子串
}
return result;
}
}
/DateTimePicker/src/com/wwj/datetimepicker/DateTimePickerActivity.java
[java] view plain
package com.wwj.datetimepicker;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
/**
* 时间拾取器界面
*
* @author wwj_748
*
*/
public class DateTimePickerActivity extends Activity {
/** Called when the activity is first created. */
private EditText startDateTime;
private EditText endDateTime;
private String initStartDateTime = "2013年9月3日 14:44"; // 初始化开始时间
private String initEndDateTime = "2014年8月23日 17:44"; // 初始化结束时间
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 两个输入框
startDateTime = (EditText) findViewById(R.id.inputDate);
endDateTime = (EditText) findViewById(R.id.inputDate2);
startDateTime.setText(initStartDateTime);
endDateTime.setText(initEndDateTime);
startDateTime.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
DateTimePickDialogUtil dateTimePicKDialog = new DateTimePickDialogUtil(
DateTimePickerActivity.this, initEndDateTime);
dateTimePicKDialog.dateTimePicKDialog(startDateTime);
}
});
endDateTime.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
DateTimePickDialogUtil dateTimePicKDialog = new DateTimePickDialogUtil(
DateTimePickerActivity.this, initEndDateTime);
dateTimePicKDialog.dateTimePicKDialog(endDateTime);
}
});
}
}
自定义界面：
/DateTimePicker/res/layout/common_datetime.xml
[html] view plain
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<DatePicker
android:id="@+id/datepicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:calendarViewShown="false" />
<TimePicker
android:id="@+id/timepicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
5. ios 滚动选择 android 下拉选择器 哪个好
都挺好的，
6. Android 时间滚动轮 选择日期的范围
可以
xml设置：
<DatePicker
android:id="@+id/dp_date"
android:layout_width="wrap_content"
android:layout_height="150dp"
android:layout_gravity="center_horizontal"
android:calendarViewShown="false"
android:minDate="mm/dd/yyyy"
android:maxDate="mm/dd/yyyy"
/>
mm/dd/yyyy为 月/日/年 如 01/01/2014
或者在代码中设置：
...
datePicker = (DatePicker)findViewById(R.id.dp_date);
//设置开始日期
//从今天开始
Calendar startCalendar = Calendar.getInstance();
startCalendar.set(Calendar.HOUR, 0);
startCalendar.set(Calendar.SECOND, 0);
startCalendar.set(Calendar.MINUTE, 0);
startCalendar.set(Calendar.MILLISECOND, 0);
datePicker.setMinDate(startCalendar.getTimeInMillis());
//设置结束日期
//到280天后结束
Calendar endCalendar = Calendar.getInstance();
endCalendar.set(Calendar.DATE, startCalendar.get(Calendar.DATE) + 280);
long endDate = endCalendar.getTimeInMillis();
datePicker.setMaxDate(endDate);
...
7. 安卓系统桌面循环滚动桌面设置的
1、手机设置”的“辅助功能”中有选择是否“桌面循环”。
2、在原生的android源码上添加这一功能。
思路：先把界面做出来，再将是否选择的值存到系统的(adb shell进入)data/data/com.android.providers.settings/databases/settings.db数据库中的system表中，
然后在Launch2的源码中取得数据库中是否选择循环桌面来执行相关代码。
先做UI：
在settings源码中的accessibility_settings.xml文件中添加一个checkbox：
java代码
android:key="launch_repeat"
android:title="@string/launch_repeat_title"
android:persistent="false"/>
在settings源码的res中添加相关的代码：
在values/string.xml中添加(英文显示)：
Launch Repeat
在values-zh-rCN/string.xml中添加(中文显示)：
"循环桌面"
在settings源码的AccessibilitySettings.java中的OnCreate中添加：
java代码
/*****************************************/
mLaunchRepeat=(CheckBoxPreference) findPreference(
LAUNCH_REPEAT);
int LaunchRepeat=Settings.System.getInt(this.getContentResolver(),
"launch_repeat",0);//取出是否被选择
if(LaunchRepeat==1)//如果被选择，那么下次打开setting时就勾选
mLaunchRepeat.setChecked(true);
else
mLaunchRepeat.setChecked(false);//如果没被选择，那么下次打开setting时就不勾选
/*****************************************/
当然还要定义几个量：
private final String LAUNCH_REPEAT =
"launch_repeat";
private CheckBoxPreference mLaunchRepeat;
在onPreferenceTreeClick函数中添加：
java代码
//add by xxnan
if(LAUNCH_REPEAT.equals(key))
{
Settings.System.putInt(getContentResolver(),
"launch_repeat",
((CheckBoxPreference) preference).isChecked()?
1:0);//将是否选择存到系统的system表中
}
//add by xxnan
如果做好了之后当点击选择“桌面循环时”可以到(adb shell进入)data/data/com.android.providers.settings/databases下的settings.db数据库(sqlite3 settings.db)的system
表中看到33|launch_repeat|1(select * from system;)。
到这里就完成了将数据存到系统system表中以及UI，接下来就是在Launch2源码中去取这个值(是否循环)。
到Launcher2源码中去找到Workspace.java文件，在里面有相应的修改：
在onTouchEvent中，之前有修改循环，如下：
java代码
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_SCROLLING) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
final int velocityX = (int)
velocityTracker.getXVelocity(mActivePointerId);
final int screenWidth = getWidth();
final int whichScreen = (mScrollX + (screenWidth / 2)) / screenWidth;
final float scrolledPos = (float) mScrollX / screenWidth;
Log.i("velocityX","velocityX="+velocityX+"whichScreen="+whichScreen);
/***********************************************/
//modifided by xxnan
if (velocityX > SNAP_VELOCITY) {
// Fling hard enough to move left.
// Don't fling across more than one screen at a time.
Log.i("numscreen","numscreen="+mCurrentScreen);
/* final int bound = scrolledPos < whichScreen ?
( (mCurrentScreen+ getChildCount()) - 1 )% getChildCount():
mCurrentScreen;*/
final int bound =( (mCurrentScreen+ getChildCount()) - 1 )% getChildCount()
;
Log.i("numscreen","bound="+bound);
snapToScreen( bound, velocityX, true);
} else if (velocityX < -SNAP_VELOCITY ) {
// Fling hard enough to move right
// Don't fling across more than one screen at a time.
/*final int bound = scrolledPos > whichScreen ?
( mCurrentScreen + 1 )% getChildCount(): mCurrentScreen;*/
final int bound = ( mCurrentScreen + 1 )% getChildCount() ;
snapToScreen(bound, velocityX, true);
} else {
snapToScreen(whichScreen, 0, true);
}
/***********************************************/
//下面是原生代码
/*if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) {
// Fling hard enough to move left.
// Don't fling across more than one screen at a time.
final int bound = scrolledPos < whichScreen ?
mCurrentScreen - 1 : mCurrentScreen;
snapToScreen(Math.min(whichScreen, bound), velocityX, true);
} else if (velocityX < -SNAP_VELOCITY && mCurrentScreen <
getChildCount() - 1) {
// Fling hard enough to move right
// Don't fling across more than one screen at a time.
final int bound = scrolledPos > whichScreen ?
mCurrentScreen + 1 : mCurrentScreen;
snapToScreen(Math.max(whichScreen, bound), velocityX, true);
} else {
snapToScreen(whichScreen, 0, true);
}*/
}
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
releaseVelocityTracker();
break;
那么就要在修改的地方加一个判断，如果system中取得的值是1，就可以循环，如果是0，就不能。
代码修改如下：
java代码
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_SCROLLING) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
final int velocityX = (int)
velocityTracker.getXVelocity(mActivePointerId);
final int screenWidth = getWidth();
final int whichScreen = (mScrollX + (screenWidth / 2)) / screenWidth;
final float scrolledPos = (float) mScrollX / screenWidth;
Log.i("velocityX","velocityX="+velocityX+"whichScreen="+whichScreen);
/***********************************************/
//modifided by xxnan 2013-1-9
launch_repeat=Settings.System.getInt(mContext.getContentResolver(),
"launch_repeat",0);//取出system表中“launch_repeat”的值
Log.i(" launch_repeat"," launch_repeat="+ launch_repeat);
if(launch_repeat==1)//如果是1，就循环，也就是之前已经改好的
{
if (velocityX > SNAP_VELOCITY) {
// Fling hard enough to move left.
// Don't fling across more than one screen at a time.
Log.i("numscreen","numscreen="+mCurrentScreen);
/* final int bound = scrolledPos < whichScreen ?
( (mCurrentScreen+ getChildCount()) - 1 )% getChildCount():
mCurrentScreen;*/
final int bound =( (mCurrentScreen+ getChildCount()) - 1 )% getChildCount()
;
Log.i("numscreen","bound="+bound);
snapToScreen( bound, velocityX, true);
} else if (velocityX < -SNAP_VELOCITY ) {
// Fling hard enough to move right
// Don't fling across more than one screen at a time.
/*final int bound = scrolledPos > whichScreen ?
( mCurrentScreen + 1 )% getChildCount(): mCurrentScreen;*/
final int bound = ( mCurrentScreen + 1 )% getChildCount() ;
snapToScreen(bound, velocityX, true);
} else {
snapToScreen(whichScreen, 0, true);
}
}
else//如果是0，那么就是原生代码，不循环
{
if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) {
// Fling hard enough to move left.
// Don't fling across more than one screen at a time.
final int bound = scrolledPos < whichScreen ?
mCurrentScreen - 1 : mCurrentScreen;
snapToScreen(Math.min(whichScreen, bound), velocityX, true);
} else if (velocityX < -SNAP_VELOCITY && mCurrentScreen <
getChildCount() - 1) {
// Fling hard enough to move right
// Don't fling across more than one screen at a time.
final int bound = scrolledPos > whichScreen ?
mCurrentScreen + 1 : mCurrentScreen;
snapToScreen(Math.max(whichScreen, bound), velocityX, true);
} else {
snapToScreen(whichScreen, 0, true);
}
}
/***********************************************/
//下面是原生代码
/*if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) {
// Fling hard enough to move left.
// Don't fling across more than one screen at a time.
final int bound = scrolledPos < whichScreen ?
mCurrentScreen - 1 : mCurrentScreen;
snapToScreen(Math.min(whichScreen, bound), velocityX, true);
} else if (velocityX < -SNAP_VELOCITY && mCurrentScreen <
getChildCount() - 1) {
// Fling hard enough to move right
// Don't fling across more than one screen at a time.
final int bound = scrolledPos > whichScreen ?
mCurrentScreen + 1 : mCurrentScreen;
snapToScreen(Math.max(whichScreen, bound), velocityX, true);
} else {
snapToScreen(whichScreen, 0, true);
}*/
}
mTouchState = TOUCH_STATE_REST;
mActivePointerId = INVALID_POINTER;
releaseVelocityTracker();
break;
当然这里面也要定义几个量，以及导入几个包：
导入包：
//add by xxnan
import android.content.ContentResolver;//从system表中取数据
import android.provider.Settings;
定义变量：
private int launch_repeat;//取得是否循环的值
到这里就全部修改好了，还有就是编译一下源码中的package/apps的Launch2和Settings的源码，将生成的out/target/。。。/system/app下的
Launch2.apk和Settings.apk替换手机里system/app的这两个apk就可以了。
8. android 手势操作中滑动和滚动的区别
滑动一般是左右，滚动是上下，而且滑动操作范围有限，滚动范围比较大
9. 安卓手机怎么设置主屏和菜单的滑动
GO桌面应用可以满足你所需要的那种主屏和菜单的滑动，然后在下载个大钟
下载完按住主屏幕---添加小部件-----选择大钟-----大功告成
10. android 中怎么实现滑动选择的dialog
两种方法 1 service发送广播intent消息，其他的activity注册receiver。收到消息显示toast 2 service发送一个intent到一个activity，该activity启动并显示提示。 这个activity，最好不是全屏的，而且不要存在历史记录中。只起到提示的作用。