01全局App的实现和数据库的创建&&自定义日志工具

第一步：

自定义日志工具，保证在上线的时候，不再打印log，保证了性能也保护了数据。

package com.dystu.newspro.debug;

import android.util.Log;



public class LogUtil {

	public static final int VERBOSE = 1;
	public static final int DEBUG = 2;
	public static final int INFO = 3;
	public static final int WARN = 4;
	public static final int ERROR = 5;
	public static final int NOTHING = 6;
	public static final int LEVEL = VERBOSE;

	public static void v(String tag, String msg) {
		if (LEVEL <= VERBOSE) {
			Log.v(tag, msg);
		}
	}

	public static void d(String tag, String msg) {
		if (LEVEL <= DEBUG) {
			Log.d(tag, msg);
		}
	}

	public static void i(String tag, String msg) {
		if (LEVEL <= INFO) {
			Log.i(tag, msg);
		}
	}

	public static void w(String tag, String msg) {
		if (LEVEL <= WARN) {
			Log.w(tag, msg);
		}
	}

	public static void e(String tag, String msg) {
		if (LEVEL <= ERROR) {
			Log.e(tag, msg);
		}
	}

}

第二步：

创建数据库：

package com.dystu.newspro.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class SQLHelper extends SQLiteOpenHelper {
	
	public static final String DB_NAME = "database.db";
	
	public static final int VERSION = 1;
	
	public static final String TABLE_CHANNEL = "ChannelItem";//数据表
	
	public static final String ID = "id";
	
	public static final String NAME = "name";
	
	public static final String ORDERID = "orderId";
	
	public static final String SELECTED = "selected";
	
	private final Context context;
	

	public SQLHelper(Context context) {
		super(context, DB_NAME, null, VERSION);
		this.context = context;
	}

	public Context getContext(){
		return context;
	}
	
	@Override
	public void onCreate(SQLiteDatabase db) {
		String sql = "create table if not exists " + TABLE_CHANNEL
				+ "(_id INTEGER PRIMARY KEY AUTOINCREMENT, " + ID
				+ " INTEGER , " + NAME + " TEXT , " + ORDERID + " INTEGER , "
				+ SELECTED + " TEXT)";
		db.execSQL(sql);
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		onCreate(db);
	}

}

第三步：

实现全局类（AndroidAnnotations和UIL见开源框架的介绍）

package com.dystu.newspro;

import java.io.File;

import org.androidannotations.annotations.EApplication;

import android.app.Application;
import android.content.Context;
import android.os.Environment;

import com.dystu.newspro.db.SQLHelper;
import com.dystu.newspro.debug.LogUtil;
import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiscCache;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.impl.WeakMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.download.BaseImageDownloader;
import com.nostra13.universalimageloader.utils.StorageUtils;

@EApplication
public class App extends Application {

	private static final String TAG = "com.dystu.newspro.App";

	private static App mAppApplication;

	private SQLHelper sqlHelper;

	@Override
	public void onCreate() {
		super.onCreate();
		mAppApplication = this;
		initImageLoader(getApplicationContext());
	}

	public static App getApp() {
		return mAppApplication;
	}

	public SQLHelper getSQLHelper() {
		if (sqlHelper == null) {
			sqlHelper = new SQLHelper(mAppApplication);
		}
		return sqlHelper;
	}

	@Override
	public void onTerminate() {
		if (sqlHelper != null) {
			sqlHelper.close();
		}
		super.onTerminate();
	}

	/**
	 * 初始化ImageLoader
	 * 
	 * @param applicationContext
	 */
	public void initImageLoader(Context applicationContext) {
		String filePath = Environment.getExternalStorageDirectory()
				+ "/Android/data/" + applicationContext.getPackageName()
				+ "/cache/";
		// 获取缓存的目录地址
		File cacheDir = StorageUtils.getOwnCacheDirectory(applicationContext,
				filePath);
		LogUtil.d(TAG, cacheDir.getPath());
		ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
				applicationContext)
				.threadPoolSize(3)
				.threadPriority(Thread.NORM_PRIORITY - 2)
				.denyCacheImageMultipleSizesInMemory()
				.memoryCache(new WeakMemoryCache())
				.memoryCacheSize(2 * 1024 * 1024)
				.discCacheFileNameGenerator(new Md5FileNameGenerator())
				.tasksProcessingOrder(QueueProcessingType.LIFO)
				.discCache(new UnlimitedDiscCache(cacheDir))
				.defaultDisplayImageOptions(DisplayImageOptions.createSimple())
				.imageDownloader(
						new BaseImageDownloader(applicationContext, 5 * 1000,
								30 * 1000)).writeDebugLogs().build();
		ImageLoader.getInstance().init(config);// 全局初始化此配置
	}

}

主要初始化UIL的配置和数据库。