转载请注明出处:http://blog.csdn.net/tyk9999tyk/article/details/53306035
1.先来认识一下xUtils3
更新 2017/03/30
给表增加字段
需求:我们需要在parent表中添加一个“username”字段。
步骤:
1.在parent类中添加“username”属性
2.调用dbManager.addColumn(Parent.class,"username");方法添加字段
3.在DbManager.DaoConfig()中的版本号+1,是否必须未知。
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更新 2017/04/19
中断网络请求的方法
String path="/mnt/sdcard/Download/icon.jpg";RequestParams params = new RequestParams("");params.setMultipart(true);params.addBodyParameter("file",new File(path));Callback.Cancelable post = x.http().post(params, new Callback.CommonCallback<String>() { @Override public void onSuccess(String result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }});//取消请求post.cancel();
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1)xUtils3简介
xUtils是目前功能比较完善的一个Android开源框架,最近又发布了xUtil3.0,在增加新功能的同时又提高了框架的性能,下面来看看官方(https://github.com/wyouflf/xUtils3)对xUtils3的介绍:
- xUtils包含了很多实用的android工具;
- xUtils支持超大文件(超过2G)上传,更全面的http请求协议支持(11种谓词),拥有更加灵活的ORM,更多的事件注解支持且不受混淆影响;
- xUtils 最低兼容Android 4.0 (api level 14);
- xUtils3变化较多所以建立了新的项目不在旧版(github.com/wyouflf/xUtils)上继续维护, 相对于旧版本:
- HTTP实现替换HttpClient为UrlConnection, 自动解析回调泛型, 更安全的断点续传策略;
- 支持标准的Cookie策略, 区分domain, path;
- 事件注解去除不常用的功能, 提高性能;
- 数据库api简化提高性能, 达到和greenDao一致的性能;
- 图片绑定支持gif(受系统兼容性影响, 部分gif文件只能静态显示), webp; 支持圆角, 圆形, 方形等裁剪, 支持自动旋转。
2)在我们的项目中快速配置xUtils3
xUtils3的配置十分的简单:
2-1)使用Gradle构建时添加一下依赖即可
compile 'org.xutils:xutils:3.3.36'
如果使用eclipse可以点击下面链接下载aar文件, 然后用zip解压,取出jar包和so文件。
Github下载:https://github.com/wyouflf/xUtils3
JCenter下载:http://jcenter.bintray.com/org/xutils/xutils/
Maven下载1:http://central.maven.org/maven2/org/xutils/xutils/
Maven下载2:http://repo1.maven.org/maven2/org/xutils/xutils/
2-2)加入权限
<uses-permission android:name="android.permission.INTERNET"/><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
2-3)创建Application
public class MyApp extends Application { @Override public void onCreate() { super.onCreate(); x.Ext.init(this); x.Ext.setDebug(false); }}
2-4)在AndroidManifest文件中注册MyApp
<application android:name=".MyApp" ...</application>
xUtils3主要包含注解模块、网络模块、图片模块和数据库模块,下面将做一一说明。
2.xUtils3注解模块的使用
xUtils3注解模块在实际开发中的使用如下:
1)Activity的注解的使用如下:
@ContentView(R.layout.activity_main)public class MainActivity extends AppCompatActivity { @ViewInject(R.id.viewpager) ViewPager viewPager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); x.view().inject(this); ... }}
2)Fragment的注解的使用如下:
@ContentView(R.layout.fragment_http)public class HttpFragment extends Fragment { @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return x.view().inject(this, inflater, container); } @Override public void onViewCreated(View v, @Nullable Bundle savedInstanceState) { super.onViewCreated(v, savedInstanceState); }}
3)为按钮设置点击事件
- 方法必须私有限定,
- 方法参数形式必须和type对应的Listener接口一致.
- 注解参数value支持数组: value={id1, id2, id3}
/** * 单击事件 * type默认View.OnClickListener.class,故此处可以简化不写,@Event(R.id.bt_main) */@Event(type = View.OnClickListener.class,value = R.id.bt_main)private void testInjectOnClick(View v){ Snackbar.make(v,"OnClickListener",Snackbar.LENGTH_SHORT).show();}/** * 长按事件 */@Event(type = View.OnLongClickListener.class,value = R.id.bt_main)private boolean testOnLongClickListener(View v){ Snackbar.make(v,"testOnLongClickListener",Snackbar.LENGTH_SHORT).show(); return true;}
强调:使用注解模块一定要注意初始化视图注解框架。
3.xUtils3网络模块的使用
xUtils3网络模块大大方便了在实际开发中网络模块的开发,xUtils3网络模块大致包括GET请求、POST请求、如何使用其他请求方式、上传文件、下载文件、使用缓存等功能,下面将做一一说明:
1)GET请求
RequestParams params = new RequestParams(url);params.addQueryStringParameter("username","abc");params.addQueryStringParameter("password","123");x.http().get(params, new Callback.CommonCallback<String>() { @Override public void onSuccess(String result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }});
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下面我们来看下带有缓存的GET请求,POST请求和其他请求方式类似,后面就不再赘述:
带有缓存的GET请求:
RequestParams params = new RequestParams(url);params.addQueryStringParameter("username","abc");params.addQueryStringParameter("password","123");params.setCacheMaxAge(1000 * 60);x.http().get(params, new Callback.CacheCallback<String>() { private boolean hasError = false; private String result = null; @Override public boolean onCache(String result) { this.result = result; return true; } @Override public void onSuccess(String result) { Log.i("JAVA", "开始请求"); if (result != null) { this.result = result; } } @Override public void onError(Throwable ex, boolean isOnCallback) { hasError = true; Toast.makeText(x.app(), ex.getMessage(), Toast.LENGTH_LONG).show(); if (ex instanceof HttpException) { HttpException httpEx = (HttpException) ex; int responseCode = httpEx.getCode(); String responseMsg = httpEx.getMessage(); String errorResult = httpEx.getResult(); } else { } } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { if (!hasError && result != null) { Toast.makeText(x.app(), result, Toast.LENGTH_LONG).show(); } }});
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上面onCache方法中需要注意的几点:
a)如果服务端没有返回过期时间,参考params.setCacheMaxAge(maxAge)方法。
b)客户端会根据服务端返回的header中max-age或expires来确定本地缓存是否给onCache方法。如果服务端没有返回max-age或expires,那么缓存将一直保存,除非这里自己定义了返回false,那么xUtils将请求新数据, 来覆盖它。
c)如果信任该缓存返回true,将不再请求网络。返回false继续请求网络,但会在请求头中加上ETag,Last-Modified等信息。如果服务端返回304,则表示数据没有更新,不继续加载数据。
2)POST请求
RequestParams params = new RequestParams(url);params.addBodyParameter("username","abc");params.addParameter("password","123");params.addHeader("head","android"); x.http().post(params, new Callback.CommonCallback<String>() { @Override public void onSuccess(String result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }});
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3)其他网络请求方式
RequestParams params = new RequestParams(url);params.addParameter("username","abc");x.http().request(HttpMethod.PUT, params, new Callback.CommonCallback<String>() { @Override public void onSuccess(String result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }});
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4)上传文件
String path="/mnt/sdcard/Download/icon.jpg";RequestParams params = new RequestParams(url);params.setMultipart(true);params.addBodyParameter("file",new File(path));x.http().post(params, new Callback.CommonCallback<String>() { @Override public void onSuccess(String result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }});
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5)下载文件
这里以下载apk为例进行说明,apk下载完成后,自动调用系统的安装方法。
url = "http://127.0.0.1/server/abc.apk";RequestParams params = new RequestParams(url);params.setSaveFilePath(Environment.getExternalStorageDirectory()+"/myapp/");params.setAutoRename(true);x.http().post(params, new Callback.ProgressCallback<File>() { @Override public void onSuccess(File result) { Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(result), "application/vnd.android.package-archive"); getActivity().startActivity(intent); } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { } @Override public void onWaiting() { } @Override public void onStarted() { } @Override public void onLoading(long total, long current, boolean isDownloading) { Log.i("JAVA","current:"+ current +",total:"+total); }});
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4.xUtils3图片模块的使用
xUtils3图片模块,重点在于加载图片的4个bind方法,loadDrawable与loadFIle用法和ImageOptions用法,需多加练习。
1)xUtils3 ImageOptions:
ImageOptions imageOptions= new ImageOptions.Builder().setFadeIn(true).build(); .setCircular(true) .setSquare(true) .setCrop(true).setSize(200,200) .setAnimation(animation) .setFailureDrawable(Drawable failureDrawable) .setFailureDrawableId(int failureDrawable) .setLoadingDrawable(Drawable loadingDrawable) .setLoadingDrawableId(int loadingDrawable) .setIgnoreGif(false) .setParamsBuilder(ParamsBuilder paramsBuilder) .setRaduis(int raduis) .setUseMemCache(true)
2)xUtils3 bind方法:
x.image().bind(imageView, "assets://test.gif", imageOptions);x.image().bind(imageView, new File("/sdcard/test.gif").toURI().toString(), imageOptions);x.image().bind(imageView, "/sdcard/test.gif", imageOptions);x.image().bind(imageView, "file:///sdcard/test.gif", imageOptions);x.image().bind(imageView, "file:/sdcard/test.gif", imageOptions);x.image().bind(imageView, url, imageOptions, new Callback.CommonCallback<Drawable>() { @Override public void onSuccess(Drawable result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }
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3)xUtils3 loadDrawable方法:
x.image().loadDrawable(url, imageOptions, new Callback.CommonCallback<Drawable>() { @Override public void onSuccess(Drawable result) { imageView.setImageDrawable(result); } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }});
4)xUtils3 loadFile方法:
当我们通过bind()或者loadDrawable()方法加载了一张图片后,它会保存到本地文件中,那当我需要这张图片时,就可以通过loadFile()方法进行查找。
x.image().loadFile(url,imageOptions,new Callback.CacheCallback<File>(){ @Override public boolean onCache(File result) { Log.i("JAVA","file:"+result.getPath()+result.getName()); return true; } @Override public void onSuccess(File result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { }});
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4.xUtils3数据库模块的使用
1)初始化配置和创建实体类
首先在项目Application中进行初始化配置DaoConfig(与onCreate方法同级目录下):
/** * 初始化DaoConfig配置 */DbManager.DaoConfig daoConfig = new DbManager.DaoConfig() .setDbName("myapp.db") .setDbDir(new File("/mnt/sdcard/")) .setDbVersion(2) .setDbOpenListener(new DbManager.DbOpenListener() { @Override public void onDbOpened(DbManager db) { db.getDatabase().enableWriteAheadLogging(); } }) .setDbUpgradeListener(new DbManager.DbUpgradeListener() { @Override public void onUpgrade(DbManager db, int oldVersion, int newVersion) { } }) .setTableCreateListener(new DbManager.TableCreateListener() { @Override public void onTableCreated(DbManager db, TableEntity<?> table){ Log.i("JAVA", "onTableCreated:" + table.getName()); } }); DbManager db = x.getDb(daoConfig);
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然后创建数据库表ChildInfo的实体类:
/** * onCreated = "sql":当第一次创建表需要插入数据时候在此写sql语句 */@Table(name = "child_info",onCreated = "")public class ChildInfo { /** * name = "id":数据库表中的一个字段 * isId = true:是否是主键 * autoGen = true:是否自动增长 * property = "NOT NULL":添加约束 */ @Column(name = "id",isId = true,autoGen = true,property = "NOT NULL") private int id; @Column(name = "c_name") private String cName; public ChildInfo(String cName) { this.cName = cName; } public ChildInfo() { } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getcName() { return cName; } public void setcName(String cName) { this.cName = cName; } @Override public String toString() { return "ChildInfo{"+"id="+id+",cName='"+cName+'\''+'}'; }}
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之后就能进行创建和删除数据库的操作了:
2)创建数据库
ArrayList<ChildInfo> childInfos = new ArrayList<>();childInfos.add(new ChildInfo("zhangsan"));childInfos.add(new ChildInfo("lisi"));childInfos.add(new ChildInfo("wangwu"));childInfos.add(new ChildInfo("zhaoliu"));childInfos.add(new ChildInfo("qianqi"));childInfos.add(new ChildInfo("sunba"));db.save(childInfos);
3)删除数据库
db.dropDb()
4)删除表
db.dropTable(ChildInfo.class)
5)新增表中的数据
ChildInfo childInfo = new ChildInfo("zhangsan123");db.save(childInfo);
6)删除表中的数据
db.delete(ChildInfo.class); WhereBuilder b = WhereBuilder.b();b.and("id",">",2); b.and("id","<",4);db.delete(ChildInfo.class, b);
7)修改表中的数据
//第一种写法:ChildInfo first = db.findFirst(ChildInfo.class)first.setcName("zhansan2")db.update(first,"c_name")//第二种写法:WhereBuilder b = WhereBuilder.b()b.and("id","=",first.getId())KeyValue name = new KeyValue("c_name","zhansan3")db.update(ChildInfo.class,b,name)//第三种写法:first.setcName("zhansan4")db.saveOrUpdate(first)
8)查询表中的数据
//查询数据库表中第一条数据ChildInfo first = db.findFirst(ChildInfo.class)Log.i("JAVA",first.toString())//添加查询条件进行查询List<ChildInfo> all = db.selector(ChildInfo.class).where("id",">",2).and("id","<",4).findAll()for(ChildInfo childInfo :all){ Log.i("JAVA",childInfo.toString())}
5.xUtils3提供的其他一些方法
1)UI异步执行
x.task().run(new Runnable() { @Override public void run() { }});
2)UI同步执行
x.task().post(new Runnable() { @Override public void run() { }});
参考文章:https://github.com/wyouflf/xUtils3