Android_代码模板

1、Android总结 孙沛林代码模板xml布局TextView <TextView android:id="+id/tv_color" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="文本" android:textSize="22sp" />EditText <EditText android:id="+id/ed_url" andr

2、oid:lines="3" android:layout_width="match_parent" android:layout_height="wrap_content" />Button <Button android:id="+id/btn" android:text="卸载" android:textColor="#fff" android:textSize="14sp" android:layout_width="66dp&

3、quot; android:layout_height="30dp" android:background="drawable/btn_selector" android:layout_marginRight="5dp"/> <Button android:id="+id/btn" android:text="按钮" android:textColor="#000" android:textSize="14sp" android:layout_

4、width="wrap_content" android:layout_height="wrap_content" android:onClick="btnClick" /> public void btnClick(View v) if (v.getId() = R.id.btn) ImageView <ImageView android:id="+id/logo" android:src="drawable/ic_10" android:layout_width="70

5、dp" android:layout_height="70dp" />图片最小宽高(minWidth, minHeight) <ImageView android:id="+id/img_item" android:minWidth="50dp" android:minHeight="50dp" android:src="drawable/default_image" android:layout_width="wrap_content" android

6、:layout_height="wrap_content"/>ListView <ListView android:id="+id/lv_main" android:layout_width="match_parent" android:layout_height="wrap_content" android:listSelector="drawable/item_selector" />SearchView搜索框 <item android:id="+id/b

7、tn_search" android:title="搜索" android:icon="drawable/title_search_normal" android:showAsAction="ifRoom|collapseActionView" android:actionViewClass="android.widget.SearchView"/>设置搜索框 MenuItem miSearch = menu.findItem(R.id.btn_search); miSearch.setOnActi

8、onExpandListener(new MenuItem.OnActionExpandListener() Override public boolean onMenuItemActionExpand(MenuItem item) / 展开 return true; Override public boolean onMenuItemActionCollapse(MenuItem item) / 折叠 updateData();/ 更新数据 return true; ); / 搜索框 sv = (SearchView) miSearch.getActionView(); sv.setSubm

9、itButtonEnabled(true);/ 显示按钮 sv.setOnQueryTextListener(this);/ 点击"提交按钮"事件Manifest清单文件权限 <!- 访问互联网-> <uses-permission android:name="android.permission.INTERNET" /> <!- 写入外置设备-> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"

10、/> <!- 可以建立和删除文件与文件夹-> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>强制竖屏+隐藏输入法 <activity android:name=".WeixinActivity" android:screenOrientation="portrait" android:windowSoftInputMode="stateHidden|stateAlwaysHidde

11、n" android:label="string/title_activity_weixin" >java代码Toast Toast.makeText(this,"",Toast.LENGTH_SHORT).show();显示Toast public static Context context; public static void init(Context cxt) context = cxt; /* * 短时间显示Toast */ public static void show(String msg) Toast.makeText(

12、context, msg, Toast.LENGTH_SHORT).show(); Adapterpublic class MyAdapter extends BaseAdapter /* 数据集合 */ List<AppInfo> list; /* 反射器 */ LayoutInflater inflater; public MyAdapter() /* * 构造器 * param context 上下文 */ public MyAdapter(Context context) inflater = LayoutInflater.from(context); /* * 传入数据集

13、合 * param list */ public void setList(List<AppInfo> list) this.list = list; Override public int getCount() return (list = null)? 0:list.size(); Override public Object getItem(int position) return list.get(position); Override public long getItemId(int position) return position; Override public

14、View getView(int position, View convertView, ViewGroup parent) ViewHolder holder = null; if (convertView = null) convertView = inflater.inflate(R.layout.item, null); holder = new ViewHolder(); holder.logo = (ImageView) convertView.findViewById(R.id.logo); holder.title = (TextView) convertView.findVi

15、ewById(R.id.title); holder.version = (TextView) convertView.findViewById(R.id.version); holder.size = (TextView) convertView.findViewById(R.id.size); holder.btn = (Button) convertView.findViewById(R.id.btn); convertView.setTag(holder); else holder = (ViewHolder) convertView.getTag(); AppInfo app = l

16、ist.get(position); holder.logo.setImageDrawable(app.icon); holder.title.setText(app.AppName); holder.version.setText("版本 : "+app.versionName); holder.size.setText("大小 : "+app.size + "M"); return convertView; public static class ViewHolder ImageView logo; TextView title;

17、 TextView version; TextView size; Button btn; 带BitmapUtil的适配器/* * 新闻列表的适配器 */public class NewsAdapter extends BaseAdapter LayoutInflater inflater; List<News> list; BitmapUtils bitmapUtils; public NewsAdapter(Context context) this.inflater = LayoutInflater.from(context); bitmapUtils = Utils.get

18、Instance(); Override public int getCount() return (list = null)? 0:list.size(); Override public Object getItem(int position) return list.get(position); Override public long getItemId(int position) return position; Override public View getView(int position, View convertView, ViewGroup parent) ViewHol

19、der holder = null; if (convertView = null) convertView = inflater.inflate(R.layout.layout_news_item, null); holder = new ViewHolder(); holder.image = (ImageView) convertView.findViewById(R.id.iv_img); holder.title = (TextView) convertView.findViewById(R.id.tv_title); holder.pubdate = (TextView) conv

20、ertView.findViewById(R.id.tv_pub_date); convertView.setTag(holder); else holder = (ViewHolder) convertView.getTag(); News item = list.get(position); bitmapUtils.display(holder.image, item.getListimage(); holder.title.setText(item.getTitle(); holder.pubdate.setText(item.getTitle(); return convertView

21、; public static class ViewHolder ImageView image; TextView title; TextView pubdate; Handler多线程+进度条 / 1声明进度框对象 ProgressDialog pd; / 显示一个环形进度框 public void showProgressDialog() pd = new ProgressDialog(MainActivity.this); pd.setProgressStyle(ProgressDialog.STYLE_SPINNER); pd.setTitle("刷新列表");

22、pd.setMessage("请耐心等待"); pd.show(); / 2声明handler对象,处理子线程结束后,UI主线程的更新 Handler handler = new Handler() Override public void handleMessage(Message msg) if (msg.what = 1) updateData_sort(currSort); pd.dismiss();/ 关闭进度框 ; /3.子线程 private void updateData() / 启动新线程,处理耗时操作 new Thread() public void r

23、un() list = Utils.getAppInfos(MainActivity.this); /耗时操作 try Thread.sleep(2000);/模拟耗时操作;真机测试时请注释掉 catch (InterruptedException e) e.printStackTrace(); handler.sendEmptyMessage(1); .start(); showProgressDialog();/ 显示进度框去标题 / 去标题 requestWindowFeature(Window.FEATURE_NO_TITLE);保持屏幕常亮 / 保持屏幕常亮 getWindow().

24、setFlags( WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON );初始化View 1.private void initView() tv_info = (TextView) findViewById(R.id.tv_info);2. private void initView() lv = (ListView) findViewById(R.id.lv_main); list = new ArrayList<String>(); ad

25、apter = new MyAdapter(this); lv.setAdapter(adapter); 比较器 / 定义3个比较器 Comparator<AppInfo> nameComparator = new Comparator<AppInfo>() Override public int compare(AppInfo lhs, AppInfo rhs) return lhs.appName.toLowerCase().compareTo(rhs.appName.toLowerCase(); ;图片缩略图 String path = item.path; Bi

26、tmapFactory.Options opt = new BitmapFactory.Options(); opt.inSampleSize = 4; / 缩放因子, 4-1/4 Bitmap bitmap = BitmapFactory.decodeFile(path,opt); holder.icon.setImageBitmap(bitmap);视频缩略图 / 生成缩略图 Thumbnails.MICRO_KIND(最小的缩略图) Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(item.path, MediaStore.Vide

27、o.Thumbnails.MICRO_KIND); holder.icon.setImageBitmap(bitmap);/ 设定ImageView的Bitmap确认对话框 new AlertDialog.Builder(this) .setTitle("确认信息") .setMessage("确认下载图片吗?") .setNeutralButton("取消",null) .setPositiveButton("确定",new DialogInterface.OnClickListener() Override p

28、ublic void onClick(DialogInterface dialog, int which) ) .show();设置Home为返回键 /设置Home为返回键,返回之前的Activity getActionBar().setDisplayHomeAsUpEnabled(true); / android.R是系统资源 if (id = android.R.id.home) finish();/ 关闭界面 return true; BitmapUtils的单例获取 / 单例模式 private static BitmapUtils bitmapUtils; public static

29、 BitmapUtils getBitmapUtils(Context appContext) if (bitmapUtils = null) bitmapUtils = new BitmapUtils(appContext); return bitmapUtils;BitmapUtils单例模式 private static BitmapUtils bitmapUtils = null; public static BitmapUtils getInstance() if (bitmapUtils = null) bitmapUtils = new BitmapUtils(context);

30、 bitmapUtils.configDefaultLoadingImage(R.drawable.ic_launcher); bitmapUtils.configDefaultLoadFailedImage(R.drawable.ic_launcher); bitmapUtils.configDefaultBitmapConfig(Bitmap.Config.RGB_565); bitmapUtils.configMemoryCacheEnabled(false); bitmapUtils.configDiskCacheEnabled(true); return bitmapUtils; 配

31、置bitmapUtilspublic void configBitmapUtils() / 加载中的图片bitmapUtils.configDefaultLoadingImage(R.drawable.default_image);/ 加载失败的图片bitmapUtils.configDefaultLoadFailedImage(R.drawable.default_image);/ 设置图片的压缩格式bitmapUtils.configDefaultBitmapConfig(Bitmap.Config.RGB_565);/ 没有透明效果的16位色/ 打开内存缓存(程序运行)bitmapUti

32、ls.configMemoryCacheEnabled(false);/ 不推荐/ 打开磁盘缓存(SDCard)bitmapUtils.configDiskCacheEnabled(true);/ 离线后可访问 / bitmapUtils.configDefaultAutoRotation(true);/ 设置图片自动可旋转/ 设置最大宽高, 不设置时更具控件属性自适应.bitmapUtils.configDefaultBitmapMaxSize(BitmapCommonUtils.getScreenSize(this).scaleDown(3);/ 滑动时加载图片，快速滑动时不加载图片/ i

33、mageListView.setOnScrollListener(new/ PauseOnScrollListener(bitmapUtils, false, true);显示单张图片(详细页面)的代码 iv_img = (ImageView) findViewById(R.id.iv_img); url = getIntent().getStringExtra("url"); bitmapUtils = Utils.getBitmapUtils(this); BitmapDisplayConfig bigPicDisplayConfig = new BitmapDispl

34、ayConfig(); /bigPicDisplayConfig.setShowOriginal(true); / 显示原始图片,不压缩, 尽量不要使用, 图片太大时容易OOM。 bigPicDisplayConfig.setBitmapConfig(Bitmap.Config.RGB_565); bigPicDisplayConfig.setBitmapMaxSize(BitmapCommonUtils.getScreenSize(this); BitmapLoadCallBack<ImageView> callback = new DefaultBitmapLoadCallBa

35、ck<ImageView>() Override public void onLoadStarted(ImageView container, String uri, BitmapDisplayConfig config) super.onLoadStarted(container, uri, config); Override public void onLoadCompleted(ImageView container, String uri, Bitmap bitmap, BitmapDisplayConfig config, BitmapLoadFrom from) sup

36、er.onLoadCompleted(container, uri, bitmap, config, from); /显示图片的地址和大小 int w = bitmap.getWidth(); int h = bitmap.getHeight(); T.show_long(url+"("+w+"*"+h+")"); ; bitmapUtils.display(iv_img,url, bigPicDisplayConfig, callback);设置本地图片为壁纸 /* * 设置桌面背景 */ private void putWallp

37、aper(Bitmap bitmap) try WallpaperManager wallpaperManager = WallpaperManager.getInstance(this); wallpaperManager.setBitmap(bitmap); catch (IOException e) String msg = "设置桌面背景发生异常:" + e.getLocalizedMessage(); Log.e("spl", "设置桌面背景发生异常！", e); T.show(msg); / 点击设置壁纸按钮 public

38、 void btn_wall(View v) final String path = imgIdsiIndex; /弹框 new AlertDialog.Builder(this) .setTitle("确认信息") .setMessage("将当前图片" + path + "设为壁纸吗?") .setNeutralButton("取消", null) .setPositiveButton("确定", new DialogInterface.OnClickListener() Override

39、public void onClick(DialogInterface dialog, int which) Bitmap bitmap = BitmapFactory.decodeFile(path); putWallpaper(bitmap); T.show("设置壁纸成功"); ) .show(); 分享图片 / 点击分享图片按钮 public void btn_share(View v) / 实例化意图 Intent intent = new Intent(); / 添加动作(干什么?) intent.setAction(android.content.Intent

40、.ACTION_VIEW); / 取得绝对路径 String path = imgIdsiIndex; / 取得文件 File file = new File(path); / 文件存在 if (file.exists() / 是个图片 intent.setDataAndType(Uri.fromFile(file), "image/*");/MIME TYPE / 发送意图 this.startActivity(intent); 显示一个环形进度框 / 1声明进度框对象 ProgressDialog pd; / 显示一个环形进度框 public void showProg

41、ressDialog() pd = new ProgressDialog(MainActivity.this); pd.setProgressStyle(ProgressDialog.STYLE_SPINNER); pd.setTitle("系统提示"); pd.setMessage("正在获取数据,请耐心等待."); pd.show(); HttpUtils获取网页内容(获取json) /* * 传入一个URL, 返回页面内容 * param url */ private void getHTML(String url) showProgressDia

42、log(); new HttpUtils().send( HttpRequest.HttpMethod.GET, url, new RequestCallBack<String>() Override public void onSuccess(ResponseInfo<String> responseInfo) String html = responseInfo.result; tv_info.setText(html); pd.dismiss(); Override public void onFailure(HttpException e, String s)

43、tv_info.setText(s); pd.dismiss(); ); 聚合数据的网址接口(微信精选) / AppKey public static final String AppKey = "c261130730787d277e7416d98d67fff4" Override protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); / 聚合数据的网址

44、接口(微信精选) String url = " getHTML(url); 两次点击退出private long mExitTime; Override public void onBackPressed() if (System.currentTimeMillis() - mExitTime) > 2000) Toast.makeText(this, "在按一次退出", Toast.LENGTH_SHORT).show(); mExitTime = System.currentTimeMillis(); else finish(); Welcome开机欢迎

45、界面package com.topnews;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.Animation.AnimationListener;public class Welcome extends Activity private AlphaAnimation start_anima;View view;Overrideprotected void onCreate(Bundle savedInstanceState) / TODO Auto-generated method stubsuper.onCreate(savedInstanceState);view = View.inflate(this, R.layout.welcome, null);setContentView(view);initVie