android滾動選擇
1. 安卓手機怎麼滾動截長圖
要看你手機支不支持截長圖了，現在的安卓手機一般都支持，截圖一下，然後圖片會停留一兩秒在邊上，你直接點一下那個圖，出來後，有提示截長圖的。望採納！
2. android 滾輪選擇控制項有哪些框架
android 滾輪選擇控制項是ios獨有的一個控制項，android還沒有原生的，不過網上有一個仿照小米的滾輪字的字的自定義view，你可以到csdn下載頻道搜搜看，是我上傳的
3. android listview 當選中一個item的時候就把這個item滾動到頂端。
listview.smoothScrollToPositonFromTop(position, 0, 60); 三個參數分別是選擇的position，滾動後到頂部的距離，用時多少ms。
4. android自定義時間選擇器，滑動選擇日期，智能判斷每月多少天
自定義一個類：
/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;
/**
* 日期時間選擇控制項 使用方法： private EditText inputDate;//需要設置的日期時間文本編輯框 private String
* initDateTime="2012年9月3日 14:44",//初始日期時間值 在點擊事件中使用：
* 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;
/**
* 日期時間彈出選擇框構造函數
*
* @param activity
* ：調用的父activity
* @param initDateTime
* 初始日期時間值，作為彈出窗口的標題和日期時間初始值
*/
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));
}
/**
* 彈出日期時間選擇框方法
*
* @param inputDate
* :為需要設置的日期時間文本編輯框
* @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("設置", 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) {
// 獲得日歷實例
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);
}
/**
* 實現將初始日期時間2012年07月02日 16:45 拆分成年 月 日 時 分 秒,並賦值給calendar
*
* @param initDateTime
* 初始日期時間值 字元串型
* @return Calendar
*/
private Calendar getCalendarByInintData(String initDateTime) {
Calendar calendar = Calendar.getInstance();
// 將初始日期時間2012年07月02日 16:45 拆分成年 月 日 時 分 秒
String date = spliteString(initDateTime, "日", "index", "front"); // 日期
String time = spliteString(initDateTime, "日", "index", "back"); // 時間
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"); // 時
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); // 取得字元串第一次出現的位置
} else {
loc = srcStr.lastIndexOf(pattern); // 最後一個匹配串的位置
}
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;
/**
* 時間拾取器界面
*
* @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"; // 初始化開始時間
private String initEndDateTime = "2014年8月23日 17:44"; // 初始化結束時間
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 兩個輸入框
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);
}
});
}
}
自定義界面：
/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 滾動選擇 android 下拉選擇器 哪個好
都挺好的，
6. Android 時間滾動輪 選擇日期的范圍
可以
xml設置：
<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為 月/日/年 如 01/01/2014
或者在代碼中設置：
...
datePicker = (DatePicker)findViewById(R.id.dp_date);
//設置開始日期
//從今天開始
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());
//設置結束日期
//到280天後結束
Calendar endCalendar = Calendar.getInstance();
endCalendar.set(Calendar.DATE, startCalendar.get(Calendar.DATE) + 280);
long endDate = endCalendar.getTimeInMillis();
datePicker.setMaxDate(endDate);
...
7. 安卓系統桌面循環滾動桌面設置的
1、手機設置」的「輔助功能」中有選擇是否「桌面循環」。
2、在原生的android源碼上添加這一功能。
思路：先把界面做出來，再將是否選擇的值存到系統的(adb shell進入)data/data/com.android.providers.settings/databases/settings.db資料庫中的system表中，
然後在Launch2的源碼中取得資料庫中是否選擇循環桌面來執行相關代碼。
先做UI：
在settings源碼中的accessibility_settings.xml文件中添加一個checkbox：
java代碼
android:key="launch_repeat"
android:title="@string/launch_repeat_title"
android:persistent="false"/>
在settings源碼的res中添加相關的代碼：
在values/string.xml中添加(英文顯示)：
Launch Repeat
在values-zh-rCN/string.xml中添加(中文顯示)：
"循環桌面"
在settings源碼的AccessibilitySettings.java中的OnCreate中添加：
java代碼
/*****************************************/
mLaunchRepeat=(CheckBoxPreference) findPreference(
LAUNCH_REPEAT);
int LaunchRepeat=Settings.System.getInt(this.getContentResolver(),
"launch_repeat",0);//取出是否被選擇
if(LaunchRepeat==1)//如果被選擇，那麼下次打開setting時就勾選
mLaunchRepeat.setChecked(true);
else
mLaunchRepeat.setChecked(false);//如果沒被選擇，那麼下次打開setting時就不勾選
/*****************************************/
當然還要定義幾個量：
private final String LAUNCH_REPEAT =
"launch_repeat";
private CheckBoxPreference mLaunchRepeat;
在onPreferenceTreeClick函數中添加：
java代碼
//add by xxnan
if(LAUNCH_REPEAT.equals(key))
{
Settings.System.putInt(getContentResolver(),
"launch_repeat",
((CheckBoxPreference) preference).isChecked()?
1:0);//將是否選擇存到系統的system表中
}
//add by xxnan
如果做好了之後當點擊選擇「桌面循環時」可以到(adb shell進入)data/data/com.android.providers.settings/databases下的settings.db資料庫(sqlite3 settings.db)的system
表中看到33|launch_repeat|1(select * from system;)。
到這里就完成了將數據存到系統system表中以及UI，接下來就是在Launch2源碼中去取這個值(是否循環)。
到Launcher2源碼中去找到Workspace.java文件，在裡面有相應的修改：
在onTouchEvent中，之前有修改循環，如下：
java代碼
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);
}
/***********************************************/
//下面是原生代碼
/*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;
那麼就要在修改的地方加一個判斷，如果system中取得的值是1，就可以循環，如果是0，就不能。
代碼修改如下：
java代碼
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，就循環，也就是之前已經改好的
{
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，那麼就是原生代碼，不循環
{
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);
}
}
/***********************************************/
//下面是原生代碼
/*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;
當然這裡面也要定義幾個量，以及導入幾個包：
導入包：
//add by xxnan
import android.content.ContentResolver;//從system表中取數據
import android.provider.Settings;
定義變數：
private int launch_repeat;//取得是否循環的值
到這里就全部修改好了，還有就是編譯一下源碼中的package/apps的Launch2和Settings的源碼，將生成的out/target/。。。/system/app下的
Launch2.apk和Settings.apk替換手機里system/app的這兩個apk就可以了。
8. android 手勢操作中滑動和滾動的區別
滑動一般是左右，滾動是上下，而且滑動操作范圍有限，滾動范圍比較大
9. 安卓手機怎麼設置主屏和菜單的滑動
GO桌面應用可以滿足你所需要的那種主屏和菜單的滑動，然後在下載個大鍾
下載完按住主屏幕---添加小部件-----選擇大鍾-----大功告成
10. android 中怎麼實現滑動選擇的dialog
兩種方法 1 service發送廣播intent消息，其他的activity注冊receiver。收到消息顯示toast 2 service發送一個intent到一個activity，該activity啟動並顯示提示。 這個activity，最好不是全屏的，而且不要存在歷史記錄中。只起到提示的作用。