Android开发之超实用的系统管理工具类

本文实例讲述了Android开发之超实用的系统管理工具类。分享给大家供大家参考，具体如下：

这是一个系统管理工具类，管理sd卡，判断网络，uri转换，获取屏幕宽高，获取网络类型，隐藏软键盘，复制文本到粘贴板，获取状态栏高度，获取当前进程等。

上代码

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;
  
  public static boolean sdCardUseable() {
    return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
  }
  
  @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
  }
  
  @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
  }
  
  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;
  }
  
  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);
  }
  
  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);
  }
  
  public static int getScreenWidth(Activity context) {
    DisplayMetrics outMetrics = new DisplayMetrics();
    context.getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
    return outMetrics.widthPixels;
  }
  
  public static int getScreenHeight(Activity context) {
    DisplayMetrics outMetrics = new DisplayMetrics();
    context.getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
    return outMetrics.heightPixels;
  }
  
  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;
  }
  
  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);
    }
  }
  
  @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);
    }
  }
  
  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;
  }
  
  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();
      }
    }
  }
}

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希望本文所述对大家Android程序设计有所帮助。