Android開發(fā)之系統(tǒng)管理工具類的示例分析
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具體如下：
這是一個(gè)系統(tǒng)管理工具類，管理sd卡，判斷網(wǎng)絡(luò)，uri轉(zhuǎn)換，獲取屏幕寬高，獲取網(wǎng)絡(luò)類型，隱藏軟鍵盤，復(fù)制文本到粘貼板，獲取狀態(tài)欄高度，獲取當(dāng)前進(jìn)程等。
上代碼
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 android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.os.StatFs;
import android.provider.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;
/** 判斷是否手機(jī)插入Sd卡 */
public static boolean sdCardUseable() {
return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
}
/**
* 獲取Sd卡的總?cè)萘?
*
* @return
*/
@SuppressLint("NewApi") public static long getSdCardTotalSize() {
if(!sdCardUseable()){
return 0;
}
// 取得SD卡文件路徑
File path = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(path.getPath());
// 獲取單個(gè)數(shù)據(jù)塊的大小(Byte)
long blockSize = sf.getBlockSizeLong();
// 獲取所有數(shù)據(jù)塊數(shù)
long allBlocks = sf.getBlockCountLong();
// 返回SD卡大小
// return allBlocks * blockSize; //單位Byte
// return (allBlocks * blockSize)/1024; //單位KB
return (allBlocks * blockSize) / 1024 / 1024; // 單位MB
}
/**
* 獲取Sd卡的可用容量
*
* @return
*/
@SuppressLint("NewApi") public static long getSdCardFreeSize() {
if(!sdCardUseable()){
return 0;
}
// 取得SD卡文件路徑
File path = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(path.getPath());
// 獲取單個(gè)數(shù)據(jù)塊的大小(Byte)
long blockSize = sf.getBlockSizeLong();
// 空閑的數(shù)據(jù)塊的數(shù)量
long freeBlocks = sf.getAvailableBlocksLong();
// 返回SD卡空閑大小
// return freeBlocks * blockSize; //單位Byte
// return (freeBlocks * blockSize)/1024; //單位KB
return (freeBlocks * blockSize) / 1024 / 1024; // 單位MB
}
/**
* 判斷是否聯(lián)網(wǎng)或者漫游
*
* @param context
* @return boolean
*/
public static boolean hasNet(Context context) {
// 獲得ConnectivityManager的管理器
NetworkInfo info = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();
if (info == null || !info.isConnected()) {
return false;
}
if (info.isRoaming()) { // 漫游判斷
return true;
}
return true;
}
/** 獲得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);
}
/** 從傳入U(xiǎn)ri獲得真實(shí)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);
}
/** 獲得屏幕的寬度 */
public static int getScreenWidth(Activity context) {
DisplayMetrics outMetrics = new DisplayMetrics();
context.getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.widthPixels;
}
/** 獲取屏幕的高度 */
public static int getScreenHeight(Activity context) {
DisplayMetrics outMetrics = new DisplayMetrics();
context.getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
return outMetrics.heightPixels;
}
/** 獲得網(wǎng)絡(luò)的類型 */
public static int getNetworkType(Context context) {
int netType = 0;
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo == null) { // 判斷是否聯(lián)網(wǎng)
return netType;
}
int nType = networkInfo.getType(); // 獲得
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;
}
/** 隱藏軟件盤 */
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 // 獲得輸入方法的Manager
.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
}
}
/**
* 復(fù)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);
}
}
/**
* 獲取狀態(tài)欄高度
*
* @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("com.android.internal.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;
}
/**
* 獲取當(dāng)前進(jìn)程名
* @param context
* @return 進(jìn)程名
*/
public static final String getProcessName(Context context) {
String processName = null;
// ActivityManager
ActivityManager am = ((ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE));
while (true) {
for (ActivityManager.RunningAppProcessInfo info : am.getRunningAppProcesses()) {
if (info.pid == android.os.Process.myPid()) {
processName = info.processName;
break;
}
}
// go home
if (!TextUtils.isEmpty(processName)) {
return processName;
}
// take a rest and again
try {
Thread.sleep(100L);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
}
}以上是“Android開發(fā)之系統(tǒng)管理工具類的示例分析”這篇文章的所有內(nèi)容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內(nèi)容對(duì)大家有所幫助，如果還想學(xué)習(xí)更多知識(shí)，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道！
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