Android开发常用工具类

最新推荐文章于 2022-05-20 23:43:24 发布

YangTinghui7

最新推荐文章于 2022-05-20 23:43:24 发布

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CC 4.0 BY-SA版权

分类专栏：开发笔记文章标签： Android常用工具类

本文链接：https://blog.youkuaiyun.com/YangTinghui7/article/details/53487672

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本文汇总了多个Android开发中常用的工具类，包括日志管理、Toast提示、SharedPreferences配置管理、应用基本信息获取等，旨在帮助开发者快速复用代码，提高开发效率。

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特地抽出时间回顾做过的项目，整理出了以下这些常用的工具类，以后开发新项目就可以直接复用了。

以下是相关源码。

1 LogUtils

package com.helios.utils;

import android.util.Log;

/**
 * 日志统一管理类
 */
public class LogUtils {
	public static final String PRE_LOG_TAG = "xx.yy.zz";// 统一的TAG前缀，有时为方便调试，过滤这个统一的前缀，当前应用的日志就全部被过滤出来。
	public static boolean isDebug = true;// 是否需要打印bug，可以在application的onCreate函数里面初始化。

	public static void e(String tag, String msg) {
		if (isDebug) {
			Log.e(PRE_LOG_TAG + tag, msg);
		}
	}

	public static void w(String tag, String msg) {
		if (isDebug) {
			Log.w(PRE_LOG_TAG + tag, msg);
		}
	}

	public static void d(String tag, String msg) {
		if (isDebug) {
			Log.d(PRE_LOG_TAG + tag, msg);
		}
	}

	public static void i(String tag, String msg) {
		if (isDebug) {
			Log.i(PRE_LOG_TAG + tag, msg);
		}
	}

	public static void v(String tag, String msg) {
		if (isDebug) {
			Log.v(PRE_LOG_TAG + tag, msg);
		}
	}

}

2 ToastUtils

package com.helios.utils;

import android.content.Context;
import android.widget.Toast;

/**
 * Toast统一管理类
 */
public class ToastUtils {
	
	private ToastUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	public static boolean isShow = true;

	/**
	 * 短时间显示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showShort(Context context, CharSequence message) {
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
	}

	/**
	 * 短时间显示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showShort(Context context, int message) {
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
	}

	/**
	 * 长时间显示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showLong(Context context, CharSequence message) {
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_LONG).show();
	}

	/**
	 * 长时间显示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showLong(Context context, int message) {
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_LONG).show();
	}

	/**
	 * 自定义显示Toast时间
	 * 
	 * @param context
	 * @param message
	 * @param duration
	 */
	public static void show(Context context, CharSequence message, int duration) {
		if (isShow)
			Toast.makeText(context, message, duration).show();
	}

	/**
	 * 自定义显示Toast时间
	 * 
	 * @param context
	 * @param message
	 * @param duration
	 */
	public static void show(Context context, int message, int duration) {
		if (isShow)
			Toast.makeText(context, message, duration).show();
	}
}

3 SPUtils

package com.helios.utils;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;

/**
 * SharedPreferences操作的封装类
 */
public class SPUtils {
	/**
	 * 保存在手机里面的文件名
	 */
	public static final String FILE_NAME = "share_data";
	
	private SPUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	/**
	 * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
	 * 
	 * @param context
	 * @param key
	 * @param object
	 */
	public static void put(Context context, String key, Object object) {

		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();

		if (object instanceof String) {
			editor.putString(key, (String) object);
		} else if (object instanceof Integer) {
			editor.putInt(key, (Integer) object);
		} else if (object instanceof Boolean) {
			editor.putBoolean(key, (Boolean) object);
		} else if (object instanceof Float) {
			editor.putFloat(key, (Float) object);
		} else if (object instanceof Long) {
			editor.putLong(key, (Long) object);
		} else {
			editor.putString(key, object.toString());
		}

		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
	 * 
	 * @param context
	 * @param key
	 * @param defaultObject
	 * @return
	 */
	public static Object get(Context context, String key, Object defaultObject) {
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);

		if (defaultObject instanceof String) {
			return sp.getString(key, (String) defaultObject);
		} else if (defaultObject instanceof Integer) {
			return sp.getInt(key, (Integer) defaultObject);
		} else if (defaultObject instanceof Boolean) {
			return sp.getBoolean(key, (Boolean) defaultObject);
		} else if (defaultObject instanceof Float) {
			return sp.getFloat(key, (Float) defaultObject);
		} else if (defaultObject instanceof Long) {
			return sp.getLong(key, (Long) defaultObject);
		}

		return null;
	}

	/**
	 * 移除某个key值已经对应的值
	 * 
	 * @param context
	 * @param key
	 */
	public static void remove(Context context, String key) {
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();
		editor.remove(key);
		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 清除所有数据
	 * 
	 * @param context
	 */
	public static void clear(Context context) {
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();
		editor.clear();
		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 查询某个key是否已经存在
	 * 
	 * @param context
	 * @param key
	 * @return
	 */
	public static boolean contains(Context context, String key) {
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		return sp.contains(key);
	}

	/**
	 * 返回所有的键值对
	 * 
	 * @param context
	 * @return
	 */
	public static Map<String, ?> getAll(Context context) {
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		return sp.getAll();
	}

	/**
	 * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
	 */
	private static class SharedPreferencesCompat {
		private static final Method sApplyMethod = findApplyMethod();

		/**
		 * 反射查找apply的方法
		 * 
		 * @return
		 */
		@SuppressWarnings({ "unchecked", "rawtypes" })
		private static Method findApplyMethod() {
			try {
				Class clz = SharedPreferences.Editor.class;
				return clz.getMethod("apply");
			} catch (NoSuchMethodException e) {
			}

			return null;
		}

		/**
		 * 如果找到则使用apply执行，否则使用commit
		 * 
		 * @param editor
		 */
		public static void apply(SharedPreferences.Editor editor) {
			try {
				if (sApplyMethod != null) {
					sApplyMethod.invoke(editor);
					return;
				}
			} catch (IllegalArgumentException e) {
			} catch (IllegalAccessException e) {
			} catch (InvocationTargetException e) {
			}
			editor.commit();
		}
	}

}

4 AppUtils

package com.helios.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

/**
 * App相关的辅助类
 */
public class AppUtils {

	private AppUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	/**
	 * 获取应用程序名称
	 */
	public static String getAppName(Context context) {
		try {
			PackageManager packageManager = context.getPackageManager();
			PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
			int labelRes = packageInfo.applicationInfo.labelRes;
			return context.getResources().getString(labelRes);
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 获取应用程序版本名称信息
	 * 
	 * @param context
	 * @return 当前应用的版本名称
	 */
	public static String getVersionName(Context context) {
		try {
			PackageManager packageManager = context.getPackageManager();
			PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
			return packageInfo.versionName;
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}
}

5 ScreenUtils

package com.helios.utils;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;

/**
 * 获得屏幕相关的辅助类
 */
public class ScreenUtils {

	private ScreenUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	/**
	 * 获得屏幕高度
	 * 
	 * @param context
	 * @return
	 */
	public static int getScreenWidth(Context context) {
		WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
		DisplayMetrics outMetrics = new DisplayMetrics();
		wm.getDefaultDisplay().getMetrics(outMetrics);
		return outMetrics.widthPixels;
	}

	/**
	 * 获得屏幕宽度
	 * 
	 * @param context
	 * @return
	 */
	public static int getScreenHeight(Context context) {
		WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
		DisplayMetrics outMetrics = new DisplayMetrics();
		wm.getDefaultDisplay().getMetrics(outMetrics);
		return outMetrics.heightPixels;
	}

	/**
	 * 获得状态栏的高度
	 * 
	 * @param context
	 * @return
	 */
	public static int getStatusHeight(Context context) {
		int statusHeight = -1;
		try {
			Class<?> clazz = Class.forName("com.android.internal.R$dimen");
			Object object = clazz.newInstance();
			int height = Integer.parseInt(clazz.getField("status_bar_height").get(object).toString());
			statusHeight = context.getResources().getDimensionPixelSize(height);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return statusHeight;
	}

	/**
	 * 获取当前屏幕截图，包含状态栏
	 * 
	 * @param activity
	 * @return
	 */
	public static Bitmap snapShotWithStatusBar(Activity activity) {
		View view = activity.getWindow().getDecorView();
		view.setDrawingCacheEnabled(true);
		view.buildDrawingCache();
		Bitmap bmp = view.getDrawingCache();
		int width = getScreenWidth(activity);
		int height = getScreenHeight(activity);
		Bitmap bp = null;
		bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
		view.destroyDrawingCache();
		return bp;
	}

	/**
	 * 获取当前屏幕截图，不包含状态栏
	 * 
	 * @param activity
	 * @return
	 */
	public static Bitmap snapShotWithoutStatusBar(Activity activity) {
		View view = activity.getWindow().getDecorView();
		view.setDrawingCacheEnabled(true);
		view.buildDrawingCache();
		Bitmap bmp = view.getDrawingCache();
		Rect frame = new Rect();
		activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
		int statusBarHeight = frame.top;

		int width = getScreenWidth(activity);
		int height = getScreenHeight(activity);
		Bitmap bp = null;
		bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height - statusBarHeight);
		view.destroyDrawingCache();
		return bp;
	}

}

6 DensityUtils

package com.helios.utils;

import android.content.Context;
import android.util.TypedValue;

/**
 * 常用单位转换的辅助类
 */
public class DensityUtils {

	private DensityUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	/**
	 * dp转px
	 * 
	 * @param context
	 * @param val
	 * @return
	 */
	public static int dp2px(Context context, float dpVal) {
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
				dpVal, context.getResources().getDisplayMetrics());
	}

	/**
	 * sp转px
	 * 
	 * @param context
	 * @param val
	 * @return
	 */
	public static int sp2px(Context context, float spVal) {
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
				spVal, context.getResources().getDisplayMetrics());
	}

	/**
	 * px转dp
	 * 
	 * @param context
	 * @param pxVal
	 * @return
	 */
	public static float px2dp(Context context, float pxVal) {
		final float scale = context.getResources().getDisplayMetrics().density;
		return (pxVal / scale);
	}

	/**
	 * px转sp
	 * 
	 * @param fontScale
	 * @param pxVal
	 * @return
	 */
	public static float px2sp(Context context, float pxVal) {
		return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
	}

}

7 KeyBoardUtils

package com.helios.utils;

import android.content.Context;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

/**
 * 打开或关闭软键盘
 */
public class KeyBoardUtils {
	
	private KeyBoardUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}
	
	/**
	 * 打卡软键盘
	 * 
	 * @param mEditText
	 *            输入框
	 * @param mContext
	 *            上下文
	 */
	public static void openKeybord(EditText mEditText, Context mContext) {
		InputMethodManager imm = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
		imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN);
		imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
	}

	/**
	 * 关闭软键盘
	 * 
	 * @param mEditText
	 *            输入框
	 * @param mContext
	 *            上下文
	 */
	public static void closeKeybord(EditText mEditText, Context mContext) {
		InputMethodManager imm = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
		imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0);
	}
}

8 SDCardUtils

package com.helios.utils;

import java.io.File;

import android.os.Environment;
import android.os.StatFs;

/**
 * SD卡相关的辅助类
 */
public class SDCardUtils {
	
	private SDCardUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	/**
	 * 判断SDCard是否可用
	 * 
	 * @return
	 */
	public static boolean isSDCardEnable() {
		return Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED);

	}

	/**
	 * 获取SD卡路径
	 * 
	 * @return
	 */
	public static String getSDCardPath() {
		return Environment.getExternalStorageDirectory().getAbsolutePath()
				+ File.separator;
	}

	/**
	 * 获取SD卡的剩余容量 单位byte
	 * 
	 * @return
	 */
	public static long getSDCardAllSize() {
		if (isSDCardEnable()) {
			StatFs stat = new StatFs(getSDCardPath());
			// 获取空闲的数据块的数量
			long availableBlocks = (long) stat.getAvailableBlocks() - 4;
			// 获取单个数据块的大小（byte）
			long freeBlocks = stat.getAvailableBlocks();
			return freeBlocks * availableBlocks;
		}
		return 0;
	}

	/**
	 * 获取指定路径所在空间的剩余可用容量字节数，单位byte
	 * 
	 * @param filePath
	 * @return 容量字节 SDCard可用空间，内部存储可用空间
	 */
	public static long getFreeBytes(String filePath) {
		// 如果是sd卡的下的路径，则获取sd卡可用容量
		if (filePath.startsWith(getSDCardPath())) {
			filePath = getSDCardPath();
		} else {// 如果是内部存储的路径，则获取内存存储的可用容量
			filePath = Environment.getDataDirectory().getAbsolutePath();
		}
		StatFs stat = new StatFs(filePath);
		long availableBlocks = (long) stat.getAvailableBlocks() - 4;
		return stat.getBlockSize() * availableBlocks;
	}

	/**
	 * 获取系统存储路径
	 * 
	 * @return
	 */
	public static String getRootDirectoryPath() {
		return Environment.getRootDirectory().getAbsolutePath();
	}

}

9 NetUtils

package com.helios.utils;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * 跟网络相关的工具类
 */
public class NetUtils {
	
	private NetUtils() {
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	/**
	 * 判断网络是否连接
	 * 
	 * @param context
	 * @return
	 */
	public static boolean isConnected(Context context) {
		ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

		if (null != connectivity) {
			NetworkInfo info = connectivity.getActiveNetworkInfo();
			if (null != info && info.isConnected()) {
				if (info.getState() == NetworkInfo.State.CONNECTED) {
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * 判断是否是WIFI连接
	 */
	public static boolean isWifi(Context context) {
		ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

		if (cm == null)
			return false;
		return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
	}

	/**
	 * 打开网络设置界面
	 */
	public static void openSetting(Activity activity) {
		Intent intent = new Intent("/");
		ComponentName cm = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
		intent.setComponent(cm);
		intent.setAction("android.intent.action.VIEW");
		activity.startActivityForResult(intent, 0);
	}

}

10 HttpUtils

package com.helios.utils;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * HTTP请求的工具类
 */
public class HttpUtils {

	private static final int TIMEOUT_IN_MILLIONS = 5000;

	public interface CallBack {
		void onRequestComplete(String result);
	}

	/**
	 * 异步的Get请求
	 * 
	 * @param urlStr
	 * @param callBack
	 */
	public static void doGetAsyn(final String urlStr, final CallBack callBack) {
		new Thread() {
			public void run() {
				try {
					String result = doGet(urlStr);
					if (callBack != null) {
						callBack.onRequestComplete(result);
					}
				} catch (Exception e) {
					e.printStackTrace();
				}

			};
		}.start();
	}

	/**
	 * 异步的Post请求
	 * 
	 * @param urlStr
	 * @param params
	 * @param callBack
	 * @throws Exception
	 */
	public static void doPostAsyn(final String urlStr, final String params,
			final CallBack callBack) throws Exception {
		new Thread() {
			public void run() {
				try {
					String result = doPost(urlStr, params);
					if (callBack != null) {
						callBack.onRequestComplete(result);
					}
				} catch (Exception e) {
					e.printStackTrace();
				}

			};
		}.start();

	}

	/**
	 * Get请求，获得返回数据
	 * 
	 * @param urlStr
	 * @return
	 * @throws Exception
	 */
	public static String doGet(String urlStr) {
		URL url = null;
		HttpURLConnection conn = null;
		InputStream is = null;
		ByteArrayOutputStream baos = null;
		try {
			url = new URL(urlStr);
			conn = (HttpURLConnection) url.openConnection();
			conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
			conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
			conn.setRequestMethod("GET");
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			if (conn.getResponseCode() == 200) {
				is = conn.getInputStream();
				baos = new ByteArrayOutputStream();
				int len = -1;
				byte[] buf = new byte[128];

				while ((len = is.read(buf)) != -1) {
					baos.write(buf, 0, len);
				}
				baos.flush();
				return baos.toString();
			} else {
				throw new RuntimeException(" responseCode is not 200 ... ");
			}

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if (is != null)
					is.close();
			} catch (IOException e) {
			}
			try {
				if (baos != null)
					baos.close();
			} catch (IOException e) {
			}
			conn.disconnect();
		}

		return null;

	}

	/**
	 * 向指定 URL 发送POST方法的请求
	 * 
	 * @param url
	 *            发送请求的 URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return 所代表远程资源的响应结果
	 * @throws Exception
	 */
	public static String doPost(String url, String param) {
		PrintWriter out = null;
		BufferedReader in = null;
		String result = "";
		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			HttpURLConnection conn = (HttpURLConnection) realUrl
					.openConnection();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestMethod("POST");
			conn.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");
			conn.setRequestProperty("charset", "utf-8");
			conn.setUseCaches(false);
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
			conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

			if (param != null && !param.trim().equals("")) {
				// 获取URLConnection对象对应的输出流
				out = new PrintWriter(conn.getOutputStream());
				// 发送请求参数
				out.print(param);
				// flush输出流的缓冲
				out.flush();
			}
			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(
					new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null) {
				result += line;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result;
	}
}