Android常用方法总结.docx

Android-常用方法1、获取资源： Resources res = getBaseContext().getResources();Drawable draw=res.getDrawable(R.drawable.icon); Button btn=(Button)findViewById(R.id.myButton);2、获得数组: String ary = getResources().getStringArray(R.array.ary);3、自动提示框：String arrays=new Stringa,ab,abc,bc,bcde,ee; actalert=(AutoCompleteTextView)findViewById(R.id.actalert); ArrayAdapter adapter=new ArrayAdapter( this, android.R.layout.simple_dropdown_item_1line, arrays); actalert.setAdapter(adapter); mactalert=(MultiAutoCompleteTextView)findViewById(R.id.mactvalert); mactalert.setAdapter(adapter);/ 设置多个值之间的分隔符，此处为逗号 mactalert.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer();4、spinner设置数据源spncolor.setPrompt(请选择); ArrayAdapter adapter = ArrayAdapter.createFromResource( this, R.array.attr, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spncolor.setAdapter(adapter);5、显示当前时间：SimpleDateFormat sdf = new SimpleDateFormat(HH:mm:ss); / 将当前时间显示在TextView组件中 tvTime.setText(当前时间： + sdf.format(new Date();6、代码添加布局文件AbsListView.LayoutParams lp = new AbsListView.LayoutParams( ViewGroup.LayoutParams.FILL_PARENT, 64); TextView text = new TextView(activity); text.setLayoutParams(lp); text.setTextSize(20); text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT); text.setPadding(36, 0, 0, 0); text.setText(s);7、自定义窗口标题栏代码 requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);/自定义标题栏 setContentView(R.layout.main); /为标题栏设置一个xml布局 getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title_custom);custom_title.xml 8、Activity仿Dialog Theme（加图标和标题其实就是Activity的icon和titile）(1)、自定义样式 drawable/filled_box drawable/filled_box：资源文件中新建drawable文件夹，新建filled_box样式xml (2)Manifest.xml中配置Acitivity样式 (3)为Activity设置图标 /设定窗口模式(仿Dialog中的icon，带有一个左图标) requestWindowFeature(Window.FEATURE_LEFT_ICON); setContentView(R.layout.main); /设置图片资源 getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON , R.drawable.icon);9、从一个Activity1到另一个Activity2，当在第二个Activity2按返回键不出现Activity1的做法是在打开Activity2的同时关闭Activity1 Intent intent = new Intent(Main.this, fowardwidget.class);startActivity(intent);finish();10、允许TextView的文本值拼接(1)允许在TextView的文本值后添加buffer texttv.setText(tv.getText(),TextView.BufferType.EDITABLE);(2)使用Editable对象添加buffer textEditable text=(Editable)tv.getText();text.append(editable);text.append(n):11、如果历史栈中包含Activity，打开此Activity从栈中放到栈顶层而不是从新打开ActivityIntent intent = new Intent(ReorderFour.this, ReorderTwo.class);intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);startActivity(intent);12、避免输入法面板遮挡，在manifest.xml中activity中设置android:windowSoftInputModeandroid:windowSoftInputMode=stateVisible|adjustResize13、获取当前手机壁纸和设置手机壁纸（wallpaper）(1)获取当前壁纸WallpaperManager wm=WallpaperManager.getInstance(this);Drawable wallpaper=wpm.getDrawable();(2)设置当前壁纸，同时要添加壁纸设置权限imapaper.setDrawingCacheEnabled(true);Drawable drawale=this.getResources().getDrawable(R.drawable.bg);imapaper.setImageDrawable(drawale);wpm.setBitmap(imapaper.getDrawingCache();14、常见通过系统服务得到的实例化对象NotificationManager nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);15、检查网络是否连接 /检查网络是否连接 public boolean checkIntent() ConnectivityManager mannager=(ConnectivityManager) this.getSystemService(CONNECTIVITY_SERVICE); NetworkInfo info=mannager.getActiveNetworkInfo(); if(info=null | !info.isConnected() return false; if(info.isRoaming() return true; return true; 16、从资源文件中（asset）读取文本文档/获得输入流InputStream in=getAssets().open(read_asset.txt);int size=in.available();/将输入流读到字节数组中（内存）byte buffer=new bytesize;in.read(buffer);in.close();String text=new String(buffer);17、TextView、Button等设置文本滚动（跑马灯效果），控件必须获得焦点才能有滚动效果，并且文字长度大于控件长度 android:singleLine=true android:ellipsize=marquee android:focusable=true android:marqueeRepeatLimit=marquee_forever /marquee_forever:一直滚动下去，n(整数）：滚动n次18、TextView文本添加下划线TextView textView = (TextView)findViewById(R.id.testView); textView.setText(Html.fromHtml(+hahaha+);19、TextView添加图片String src=+R.drawable.qq; Html.ImageGetter imageGetter =new ImageGetter() Drawable draw=null; Override public Drawable getDrawable(String source) / TODO Auto-generated method stub int id=Integer.parseInt(source.trim(); draw=getResources().getDrawable(id); draw.setBounds(0, 0, draw.getIntrinsicWidth(), draw.getIntrinsicHeight(); return draw; ; tvquestion.append(Html.fromHtml(img src=+src+, imageGetter, null);20、秒转成00：00:00 int hour=time/60/60%60; int minute = time/60%60; int second = time%60; String strhour=hour10 ? 0 + hour : + hour; String strminutes=minute10 ? 0 + minute : + minute; String strseconds=second 10 ? 0 + second : + second; tvtimer.setText(strhour+:+strminutes+:+strseconds);21、TextView添加滚动条 22、Activity自动销毁时调用onSaveInstanceState()方法保存配置信息:可多Activity共享 Override public void onSaveInstanceState(Bundle outState) SharedPreferences.Editor editor=getSharedPreferences(sp_timer, 0).edit(); editor.p