Android编程常用技巧实例总结

<?xml version="1.0" encoding="utf-8"?> 
<translate 
  xmlns:android="http://schemas.android.com/apk/res/android" 
  android:fromXDelta="0" 
  android:toXDelta="10" 
  android:duration="1000" 
  android:interpolator="@anim/main_login_cycle_7" />

<?xml version="1.0" encoding="utf-8"?> 
<cycleInterpolator xmlns:android="http://schemas.android.com/apk/res/android" android:cycles="7" /> 

shakeanim = AnimationUtils.loadAnimation(this,R.anim.main_login_shake);
btn_login.setOnClickListener(new OnClickListener() { 
  @Override 
  public void onClick(View v) { 
   boolean ready = true; 
   String username=et_username.getText().toString(); 
   String password=et_password.getText().toString(); 
   if (!username.matches("^\\w{1,}+$")) { 
    ready = false; 
    et_username.startAnimation(shakeanim); 
   } 
   if (!password.matches("^\\w{1,}+$")) { 
    ready = false; 
    et_password.startAnimation(shakeanim); 
   } 
   if(selectClinic==null){ 
    ready = false; 
    et_clinic.startAnimation(shakeanim); 
   } 
   if (ready) { 
    loginStart(username,password,Long.parseLong(selectClinic.get("id").toString()),Integer.parseInt(selectClinic.get("type_id").toString()));
   } 
  } 
});

showDialog(R.id.wait_edit_arriveltime); 
showDialog(R.id.wait_edit_yuyuedata); 
showDialog(R.id.wait_edit_close); 
......
protected Dialog onCreateDialog(int id) { 
  Dialog dialog = null; 
  switch (id) { 
  case R.id.wait_edit_yuyuedata: 
    DatePickerDialog.OnDateSetListener dateListener = new DatePickerDialog.OnDateSetListener() {
     @Override 
     public void onDateSet(DatePicker datePicker,int year, int month, int dayOfMonth) {
      wait_edit_yuyuedata.setText(dayOfMonth + "/"+(month+1)+"/"+year);
     } 
    }; 
    dialog = new DatePickerDialog(this, dateListener, Integer.parseInt(app.getAppointedDate().split("/")[2]), Integer.parseInt(app.getAppointedDate().split("/")[1]), Integer.parseInt(app.getAppointedDate().split("/")[0])); 
    break; 
  case R.id.wait_edit_arriveltime: 
   TimePickerDialog.OnTimeSetListener timeListener = new TimePickerDialog.OnTimeSetListener() {
    @Override 
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
     wait_edit_arriveltime.setText(hourOfDay+":"+minute); 
    } 
   }; 
   dialog = new TimePickerDialog(this, timeListener, Integer.parseInt(app.getEstimateArriveTime().split(":")[0]), Integer.parseInt(app.getEstimateArriveTime().split(":")[1]), true);
   break; 
  case R.id.wait_edit_close: 
   AlertDialog.Builder builder = new AlertDialog.Builder(EditWaitActivity.this);
   builder.setTitle("您要确定放弃编辑吗？"); 
   builder.setPositiveButton("确定",new DialogInterface.OnClickListener() {
    @Override 
    public void onClick(DialogInterface arg0, int arg1) { 
     EditWaitActivity.this.finish(); 
    }}); 
   builder.setNegativeButton("取消",new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog,int whichButton) {
    } 
   }); 
   builder.show(); 
   break; 
  default: 
   break; 
  } 
  return dialog; 
}

public class MyAdapter extends BaseAdapter{ 
 Context context; 
 PageRecord<Appointment> data; 
 private ViewHolder tempHolder; 
 private View tempView; 
 public MyAdapter(Context context,PageRecord<Appointment> data){ 
  this.context = context; 
  this.data = data; 
 } 
 public View getView(int position, View convertView, ViewGroup parent) { 
  final ViewHolder holder; 
  Appointment app = data.getResultSet().get(position); 
  if(convertView==null){ 
   convertView=LayoutInflater.from(context).inflate(R.layout.item, null); 
   holder=new ViewHolder(convertView); 
   convertView.setTag(holder); 
  }else{ 
   holder=(ViewHolder) convertView.getTag(); 
  } 
  tempHolder = holder; 
  tempView = convertView; 
  holder.setData(app); 
  return convertView; 
 } 
 public long getItemId(int position) { 
  return position; 
 } 
 public Object getItem(int position) { 
  return data.getResultSet().get(position); 
 } 
 public int getCount() { 
  return data.getResultSet()==null?0:data.getResultSet().size(); 
 } 
 public void setData(PageRecord<Appointment> data){ 
  this.data = data; 
  this.notifyDataSetChanged(); 
  tempView.invalidate(); 
 } 
 /** 
  * 重新绘制 
  * @param app 
  */ 
 public void redraw(Appointment app){ 
  tempHolder.timeView.setText(app.getAppointedDate()+" "+app.getEstimateArriveTime()); 
  tempHolder.nameView.setText(app.getPatient().getNameEN()); 
  tempHolder.doctorView.setText(app.getMo().getNameEN()); 
  tempView.invalidate(); 
 } 
 private class ViewHolder{ 
  private TextView timeView; 
  private TextView nameView; 
  private TextView doctorView; 
  public ViewHolder(View convertView){ 
   timeView = (TextView) convertView.findViewById(R.id.yuyuetime);
   nameView = (TextView) convertView.findViewById(R.id.yuyuename);
   doctorView = (TextView) convertView.findViewById(R.id.doctorname);
  } 
  public void setData(Appointment app){ 
   timeView.setText(app.getAppointedDate()+" "+app.getEstimateArriveTime()); 
   nameView.setText(app.getPatient().getNameEN());
   doctorView.setText(app.getMo().getNameEN());
  } 
 } 
}

// 方法1 Android获得屏幕的宽和高
WindowManager windowManager = getWindowManager();
Display display = windowManager.getDefaultDisplay();
int screenWidth = display.getWidth();
int screenHeight = display.getHeight();
// 方法2
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
float width=dm.widthPixels*dm.density;
float height=dm.heightPixels*dm.density;

pixs =dips * (density/160)
dips=(pixs*160)/density