==============Activity的启动============================================1.一个activity转到另一个activity上『Intentintent=newIntent(this,SecondActivity.class);intent.putExtra("age",18);//传参数startActivity(intent);』=============================Toast=================================Toast.makeText(this,"所要显示的内容",Toast.LENGTH_LONG).show();==========AlertDialog的用法========================================添加弹出对话框的方法：newAlertDialog.Builder(this).setTitle("Demo").setView(dialogView()).setPositiveButton("sure",null).setNegitiveButton（“cancer”，null）.show();往弹出对话框中添加控件的方法（.setView（View）方法）Viewview=LayoutInflater.from(this).inflate(R.layout.alertlayout,null);ImageButtonbtn=(ImageButton)view.findViewById(R.id.adialog_imgbtn);finalTextViewtv=(TextView)view.findViewById(R.id.adialog_tv);=======================三种适配器的比较=============================（1）ArrayAdapter的使用Spinner下拉菜单xml:android:prompt="@string/xxx"java:准备一个List<String>或者String[]spinner=....ArrayAdapter<String>adapter=newArrayAdapter<String>(this,android.R.layout.simple_spinner_item,String[]数据源);//设置Spinner弹出的样式adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);spinner.setAdapter(adapter);spinner.setOnItemSelectedListener();ArrayAdapteradapter=newArrayAdapter(this,R.layout.XXX,数据源);（2）SimpleAdapter的使用SimpleAdapteradapter=newSimpleAdapter(this,数据源,R.layout.XXXX,newString[]{map的key},newint[]{R.layout.XXXX中的控件的id})例子：A.数据和控件的连接listview=(ListView)findViewById(R.id.lv02);adapter=newSimpleAdapter(this,getData(),//数据源R.layout.listview02_item,//ListView的item的layout文件newString[]{"name","tel"},//数据源中Map的keynewint[]{R.id.lv02_item_tvName,R.id.lv02_item_tvTel}//ListView的item的layout文件用来显示数据的控件的id);listview.setAdapter(adapter);B.准备数据源privateList<HashMap<String,Object>>getData(){data=newArrayList<HashMap<String,Object>>();HashMap<String,Object>map01=newHashMap<String,Object>();map0