write & read object to file by Serializable

ex:

public class FitPlan implements Serializable {

public long startDateNumber;
public long endDateNumber;
public float targetWeight;
public float startWeight;
public String name;
public int calorieQuota;
public int bmr;
public float workPercentage;
public String uuid;


       public void writeToFile(Context context)
{
File file = new File(context.getFilesDir(), "plan.txt");
try {
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);            
oos.writeObject(this);
oos.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

public static FitPlan createFromFile(Context context)
{
File file = new File(context.getFilesDir(), "plan.txt");
FitPlan plan = null;

try{
FileInputStream fis = new FileInputStream(file);
ObjectInputStream in = new ObjectInputStream(fis);            

plan = (FitPlan) in.readObject();

in.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return plan;
}

}

說明
FitPlan的每個欄位也都必須是Serializable，才能寫入檔案。
不想寫入檔案的欄位，可加上transient

取得前一天/後一天的時間

currentDate的類別是Time

void preDay() {
this.currentDate.monthDay -= 1;
this.currentDate.normalize(true);

}


void nextDay() {
 this.currentDate.monthDay += 1;
 this.currentDate.normalize(true);

}

apk

路徑:

bin/xxx.apk

執行App後，才會產生新的apk

從Finder打開檔案

1. 設定External Tools Configuration

2. 新增打開Finder的指令

輸入Location : /usr/bin/open
       Arguments:  ${container_loc}

3. 點選檔案

4. 點選finder

取得screen的大小

        DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        int width = displaymetrics.widthPixels;
        int height = displaymetrics.heightPixels;

設定action bar的title color

ex


   <style name="MyTitleTextStyle" parent="@android:style/TextAppearance">
    <item name="android:textColor">#000000</item>
  </style>
 
    <style name="MyActionBar" parent="android:Widget.Holo.ActionBar">
  <item name="android:background">@android:color/transparent</item>
     <item name="android:titleTextStyle">@style/MyTitleTextStyle</item>
 
</style>
   
    <style name="FitMiTheme" parent="@android:style/Theme.Holo">
          <item name="android:windowActionBarOverlay">true</item>
       <item name="android:actionMenuTextColor">#0000ff</item>
      <item name="android:actionBarStyle">@style/MyActionBar</item>
             
    </style>

設定action bar上button icon

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/action_settings"
        android:showAsAction="always"
        android:icon="@drawable/setting"/>

</menu>

移除action bar divider

ex:

 <style name="MyActionBar" parent="android:Widget.Holo.ActionBar">
  <item name="android:background">@android:color/transparent</item>
</style>
   
    <style name="FitMiTheme" parent="@android:style/Theme.Holo">
          <item name="android:windowActionBarOverlay">true</item>
       <item name="android:actionMenuTextColor">#0000ff</item>
         <item name="android:actionBarStyle">@style/MyActionBar</item>
             
    </style>

App設計教學文章

Android cheatsheet for graphic designers

Designing For Android

write bitmap to file

ex:
File imageFile; 
Bitmap bitmap;
FileOutputStream out = new FileOutputStream(imageFile);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);

save file in external storage

1. 設定權限 in AndroidManifest.xml


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.passionbean.fitmi"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="17" />
 
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:allowBackup="true"

2.  建立file


File albumDir = new File(
   Environment.getExternalStoragePublicDirectory(
       Environment.DIRECTORY_PICTURES
   ),
   "FitMi"
);


if(albumDir.exists() == false)
{
albumDir.mkdir();

}

File imageFile = new File(albumDir.getPath(), "test.jpg");

camera使用

http://developer.android.com/training/camera/photobasics.html

AlertDialog的使用

ex:


AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
     AddFoodActivity.this);
   
alertDialogBuilder.setTitle("選擇來源");
   
 
alertDialogBuilder.setCancelable(true)
    .setPositiveButton("拍照",new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog,int id) {
    // if this button is clicked, close
    // current activity
    Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    startActivityForResult(i, CAPTURE_IMAGE_ACTIVITY_REQ );
    }
     })
    .setNeutralButton("相簿",new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog,int id) {
    // if this button is clicked, just close
    // the dialog box and do nothing
    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
    i.setType("image/*");
    startActivityForResult(i, ALBUM_IMAGE_ACTIVITY_REQ );
    }
    })
    .setNegativeButton("取消", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog,int id) {
    // if this button is clicked, just close
    // the dialog box and do nothing
    dialog.cancel();
    }
    });
   
AlertDialog alertDialog = alertDialogBuilder.create();
   
alertDialog.show();

建立list單選的dialog:


final CharSequence[] items = {"靜態活動(大部份時間都坐著)", "輕度活動(每天散步的人)", "中度活動(每天做劇烈運動的人)",
"重度活動(參與每日體育訓練的人)" };

AlertDialog.Builder builder = new AlertDialog.Builder(this);
     

builder.setTitle("工作活動量")
          .setItems(items, new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog, int which) {
              // The 'which' argument contains the index position
              // of the selected item
             
          }
   });
AlertDialog alertDialog = builder.create();
alertDialog.show();

ViewPager的使用

建立頁面UI元件

public Object instantiateItem(View container, int position)

delete頁面UI元件
public void destroyItem(View arg0, int arg1, Object arg2)

更新ViewPager

ex:
ImageAdapter adapter = (ImageAdapter)viewPager.getAdapter();
viewPager.setAdapter (null);
viewPager.setCurrentItem(newIndex);
viewPager.setAdapter (adapter);

dp轉pixel

ex:

 int height = (int)TypedValue.applyDimension(
               TypedValue.COMPLEX_UNIT_DIP, 1, getResources().getDisplayMetrics());


當程式或XML裡設定單位為dp時，對應的pixel計算範例:
10 dp:
MDPI : 10 pixel
HDPI:   15 pixel
XHDPI:  20 pixel

文字置中

ex:

dateTextView.setGravity(Gravity.CENTER_HORIZONTAL);

UI文字設定 (font)

XML:
ex:


<Button
           android:id="@+id/addFoodCategoryBreakfastButton"
    android:layout_width="80dp"
    android:layout_height="30dp"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp"
    android:text="早餐"
     android:textColor="#000000"

android:textSize="12sp"

    android:background="@drawable/roundcornerforaddfoodcategorybutton"
    />

設定圓角

1. 新增設定圓角圖形的XML在res/drawable下

ex: 新增roundcorner.xml


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

<corners android:radius="8dp" />

<solid android:color="#7fc7b299" />

</shape>

ex:


<corners android:bottomRightRadius="8dp" android:bottomLeftRadius="8dp"
     android:topLeftRadius="0dp" android:topRightRadius="0dp"/>


說明:
solid欄位設定圖形的背景顏色

2.  在layout的xml指定background為roundcorner

ex:


<View
           android:id="@+id/addFoodCategoryBackground"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp"
     android:layout_below="@+id/addFoodDateTitleImageView"
    android:layout_toRightOf="@+id/addFoodPhotoButton"
    android:background="@drawable/roundCorner"
    />