【移动应用开发技术】Android开发之系统管理工具类的示例分析

【移动应用开发技术】Android开发之系统管理工具类的示例分析

import

java.io.File;

import

android.annotation.SuppressLint;

import

android.annotation.TargetApi;

import

android.app.Activity;

import

android.app.ActivityManager;

import

android.content.ClipData;

import

android.content.Context;

import

android.database.Cursor;

import

.ConnectivityManager;

import

.NetworkInfo;

import

.Uri;

import

android.os.Build;

import

android.os.Environment;

import

android.os.StatFs;

import

vider.MediaStore;

import

android.text.TextUtils;

import

android.util.DisplayMetrics;

import

android.view.View;

import

android.view.inputmethod.InputMethodManager;

@SuppressWarnings("deprecation")

public

class

SystemUtil

{

public

static

final

int

NETTYPE_WIFI

=

0x01;

public

static

final

int

NETTYPE_CMWAP

=

0x02;

public

static

final

int

NETTYPE_CMNET

=

0x03;

/**

判断是否手机插入Sd卡

*/

public

static

boolean

sdCardUseable()

{

return

Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);

}

/**

*

获取Sd卡的总容量

*

*

@return

*/

@SuppressLint("NewApi")

public

static

long

getSdCardTotalSize()

{

if(!sdCardUseable()){

return

0;

}

//

取得SD卡文件路径

File

path

=

Environment.getExternalStorageDirectory();

StatFs

sf

=

new

StatFs(path.getPath());

//

获取单个数据块的大小(Byte)

long

blockSize

=

sf.getBlockSizeLong();

//

获取所有数据块数

long

allBlocks

=

sf.getBlockCountLong();

//

返回SD卡大小

//

return

allBlocks

*

blockSize;

//单位Byte

//

return

(allBlocks

*

blockSize)/1024;

//单位KB

return

(allBlocks

*

blockSize)

/

1024

/

1024;

//

单位MB

}

/**

*

获取Sd卡的可用容量

*

*

@return

*/

@SuppressLint("NewApi")

public

static

long

getSdCardFreeSize()

{

if(!sdCardUseable()){

return

0;

}

//

取得SD卡文件路径

File

path

=

Environment.getExternalStorageDirectory();

StatFs

sf

=

new

StatFs(path.getPath());

//

获取单个数据块的大小(Byte)

long

blockSize

=

sf.getBlockSizeLong();

//

空闲的数据块的数量

long

freeBlocks

=

sf.getAvailableBlocksLong();

//

返回SD卡空闲大小

//

return

freeBlocks

*

blockSize;

//单位Byte

//

return

(freeBlocks

*

blockSize)/1024;

//单位KB

return

(freeBlocks

*

blockSize)

/

1024

/

1024;

//

单位MB

}

/**

*

判断是否联网或者漫游

*

*

@param

context

*

@return

boolean

*/

public

static

boolean

hasNet(Context

context)

{

//

获得ConnectivityManager的管理器

NetworkInfo

info

=

((ConnectivityManager)

context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();

if

(info

==

null

||

!info.isConnected())

{

return

false;

}

if

(info.isRoaming())

{

//

漫游判断

return

true;

}

return

true;

}

/**

获得The

data

stream

for

the

file

*/

public

static

String

getUrlPath(Activity

context,

Uri

uri)

{

String[]

proj

=

{

MediaStore.Images.Media.DATA

};

Cursor

cursor

=

context.managedQuery(uri,

proj,

null,

null,

null);

int

column_index

=

cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

cursor.moveToFirst();

return

cursor.getString(column_index);

}

/**

从传入Uri获得真实的path

*/

public

String

getRealPathFromURI(Activity

context,

Uri

contentUri)

{

//

can

post

image

String[]

proj

=

{

MediaStore.Images.Media.DATA

};

Cursor

cursor

=

context.managedQuery(contentUri,

proj,

//

Which

columns

//

to

return

null,

//

WHERE

clause;

which

rows

to

return

(all

rows)

null,

//

WHERE

clause

selection

arguments

(none)

null);

//

Order-by

clause

(ascending

by

name)

int

column_index

=

cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

cursor.moveToFirst();

return

cursor.getString(column_index);

}

/**

获得屏幕的宽度

*/

public

static

int

getScreenWidth(Activity

context)

{

DisplayMetrics

outMetrics

=

new

DisplayMetrics();

context.getWindowManager().getDefaultDisplay().getMetrics(outMetrics);

return

outMetrics.widthPixels;

}

/**

获取屏幕的高度

*/

public

static

int

getScreenHeight(Activity

context)

{

DisplayMetrics

outMetrics

=

new

DisplayMetrics();

context.getWindowManager().getDefaultDisplay().getMetrics(outMetrics);

return

outMetrics.heightPixels;

}

/**

获得网络的类型

*/

public

static

int

getNetworkType(Context

context)

{

int

netType

=

0;

ConnectivityManager

connectivityManager

=

(ConnectivityManager)

context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo

networkInfo

=

connectivityManager.getActiveNetworkInfo();

if

(networkInfo

==

null)

{

//

判断是否联网

return

netType;

}

int

nType

=

networkInfo.getType();

//

获得

if

(nType

==

ConnectivityManager.TYPE_MOBILE)

{

String

extraInfo

=

networkInfo.getExtraInfo();

if

(!TextUtils.isEmpty(extraInfo))

{

if

(extraInfo.toLowerCase().equals("cmnet"))

{

netType

=

NETTYPE_CMNET;

}

else

{

netType

=

NETTYPE_CMWAP;

}

}

}

else

if

(nType

==

ConnectivityManager.TYPE_WIFI)

{

netType

=

NETTYPE_WIFI;

}

return

netType;

}

/**

隐藏软件盘

*/

public

static

void

hideSoftKeyborad(Activity

context)

{

final

View

v

=

context.getWindow().peekDecorView();

//

Retrieve

the

//

current

decor

//

view

if

(v

!=

null

&&

v.getWindowToken()

!=

null)

{

InputMethodManager

imm

=

(InputMethodManager)

context

//

获得输入方法的Manager

.getSystemService(Context.INPUT_METHOD_SERVICE);

imm.hideSoftInputFromWindow(v.getWindowToken(),

0);

}

}

/**

*

复制文本到剪切板

*

*

@param

context

*

@param

text

*/

@TargetApi(value

=

11)

@SuppressLint({

"NewApi",

"NewApi"

})

public

static

void

copyText(Context

context,

String

text)

{

if

(Build.VERSION.SDK_INT

>=

Build.VERSION_CODES.HONEYCOMB)

{

android.content.ClipboardManager

clipboardManager

=

(android.content.ClipboardManager)

context

.getSystemService(Context.CLIPBOARD_SERVICE);

ClipData

clipData

=

ClipData.newPlainText("label",

text);

clipboardManager.setPrimaryClip(clipData);

}

else

{

android.text.ClipboardManager

clipboardManager

=

(android.text.ClipboardManager)

context.getSystemService(Context.CLIPBOARD_SERVICE);

clipboardManager.setText(text);

}

}

/**

*

获取状态栏高度

*

*

@return

*/

public

static

int

getStatusBarHeight(Context

context)

{

Class<?>

c

=

null;

Object

obj

=

null;

java.lang.reflect.Field

field

=

null;

int

x

=

0;

int

statusBarHeight

=

0;

try

{

c

=

Class.forName("ernal.R$dimen");

obj

=

c.newInstance();

field

=

c.getField("status_bar_height");

x

=

Integer.parseInt(field.get(obj).toString());

statusBarHeight

=

context.getResources().getDimensionPixelSize(x);

return

statusBarHeight;

}

catch

(Exception

e)

{

e.printStackTrace();

}

return

statusBarHeight;

}

/**

*

获取当前进程