android一些核心功能程序代码

1、对话框：

@Override
protected Dialog onCreateDialog(int id) {
  switch(id){
  case DIALOG_WELCOME:
   return new AlertDialog.Builder(this).setIcon(android.R.drawable.ic_dialog_info).setTitle("欢迎").setMessage("欢迎使用本程序！").setPositiveButton("确定", new OnClickListener(){

    public void onClick(DialogInterface arg0, int arg1) {
     // TODO Auto-generated method stub
    }
   }).create();
  default: return null;
  }
}

2、上下文菜单事件：

@Override
public boolean onContextItemSelected(MenuItem item) {
  super.onContextItemSelected(item);
  switch(item.getItemId()){
  case C_MENU_NEW:
   //
   showDialog(DIALOG_WELCOME);
   break;
  case C_MENU_OPEN:
   //
   break;
  }
  return false;
}

3、选项菜单事件

@Override
public boolean onOptionsItemSelected(MenuItem item) {
  super.onOptionsItemSelected(item);
  switch(item.getItemId()){
  case MENU_SAVE:
   //保存操作

   break;
  case MENU_DELETE:
   //删除操作
   break;
  }
  return false;
}

4、创建上下文菜单

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
   ContextMenuInfo menuInfo) {
  super.onCreateContextMenu(menu, v, menuInfo);
  menu.add(0,C_MENU_NEW,0,"新建");
  menu.add(0,C_MENU_OPEN,0,"打开");
}

5、创建选项菜单

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  //menu.add(0, MENU_SAVE, 0, "保存").setIcon(android.R.drawable.ic_menu_save);
  //super.onCreateOptionsMenu(menu);
  SubMenu sub=menu.addSubMenu("搜索");
  sub.setIcon(android.R.drawable.ic_menu_search);
  sub.add(0, MENU_LOCAL, 0, "本地");
  sub.add(0,MENU_INTERNET,0,"网络");
  //menu.add(0, MENU_DELETE, 0, "删除").setIcon(android.R.drawable.ic_menu_delete);
  return true;
}

1、时间选择器
private int DIALOG_DATEPICKER=1;
private Calendar c;
@Override
protected Dialog onCreateDialog(int id) {
  switch(id){
  case DIALOG_DATEPICKER:
   return new DatePickerDialog(this,new OnDateSetListener(){

    public void onDateSet(DatePicker arg0, int arg1, int arg2,
      int arg3) {
     /**
      * 这是设置好日期后的回调方法，
      * 可以根据设置的内容更新用户界面，
      * 或者系统时间
      */
    }
    },c.get(Calendar.YEAR),c.get(Calendar.MONTH),c.get(Calendar.DAY_OF_MONTH));
  default:
    return null;
  }
}

2、进度条
final int MSG_PROGRESS=1;
final int MAXPROGRESS=100;
final int DIALOG_PROGRESS=1;
ProgressDialog pd;
Handler pHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  pHandler=new Handler(){

   @Override
   public void handleMessage(Message msg) {
    super.handleMessage(msg);
    switch(msg.what){
    case MSG_PROGRESS:
     if(pd.getProgress()>=MAXPROGRESS){
      pd.dismiss();
     }else{
      pd.incrementProgressBy(1);
      pHandler.sendEmptyMessageDelayed(MSG_PROGRESS, 100);
     }
     break;
     default:
      break;
    }
   }

  };
  this.showDialog(DIALOG_PROGRESS);
  pHandler.sendEmptyMessage(MSG_PROGRESS);
}
@Override
protected Dialog onCreateDialog(int id) {
  switch(id){
  case DIALOG_PROGRESS:
   pd=new ProgressDialog(this);
   pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
   pd.setMax(MAXPROGRESS);
   pd.setProgress(0);
   return pd;
  default:
    return null;
  }
}

3、数据库绑定
public class Test extends ListActivity {
String[] weekStrings=new String[]{"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
ArrayAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
adapter=new ArrayAdapter(this,android.R.layout.simple_list_item_1,weekStrings);
this.setListAdapter(adapter);
}

}

1、自己做的拨号机
public class TinyDialer extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final EditText phoneNumber=(EditText)this.findViewById(R.id.phonenumber_id);
        final Button button=(Button)this.findViewById(R.id.button_id);
        button.setOnClickListener(new Button.OnClickListener(){

   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    String callee=phoneNumber.getText().toString();
    if(PhoneNumberUtils.isGlobalPhoneNumber(callee)){
     Intent i=new Intent(Intent.ACTION_DIAL,Uri.parse("tel://"+callee));
     startActivity(i);
    }else{
     Toast.makeText(TinyDialer.this,R.string.notify_incorrect_phonenumber,Toast.LENGTH_LONG).show();
    }
   }
        });
    }
}

2、发送短信程序
public class TinySMS extends Activity {
private EditText txtphoneNo;
private EditText txtMessage;
Button btnSendSMS;
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  txtphoneNo=this.findViewById(R.layout.txtPhoneNo);
  txtMessage=this.findViewById(R.layout.txtMessage);
  btnSendSMS=this.findViewById(R.layout.btnSendSMS);
  btnSendSMS.setOnClickListener(new OnClickListener(){
   public void onClick(View arg0) {
    String phoneNo=txtphoneNo.getText().toString();
    String message=txtMessage.getText().toString();
    if(phoneNo.length()>0&&message.length()>0){
     sendSMS(phoneNo,message);
    }else{
     Toast.makeText(TinySMS.this,"请输入电话号码和短信内容！",Toast.LENGTH_LONG).show();
    }
   }
  });
}
private void sendSMS(String phoneNumber,String message){
  PendingIntent pi=PendingIntent.getActivity(this,0,new Intent(this,TinySMS.class),0);
  SmsManager sms=SmsManager.getDefault();
  sms.sendTextMessage(phoneNumber, null, message, pi, null);
}

}
注意：androidManifest.xml中声明权限：

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