Android Developer: Android note

1. Hello Google MAP:

Cmd > cd /C:/program File/ Java/sdk/bin > keytool -list -alias androiddebugkey -keystore C:\Users\sonnt\.android\debug.keystore -storepass android -keypass android –v

Copy: chuỗi MD5.

E9:2C:A5:2E:80:79:FF:CD:4B:DB:25:B0:8D:7C:AA:CE

Vào Link : http://code.google.com/android/maps-api-signup.html

Sẽ thu đựơc :

Cảm ơn bạn đã đăng ký khóa Android Maps API!

Khoá của bạn là:

0qM3SvB2qp0QntwmC_nS582rZSmG8WYSBXteEGg

Khoá này phù hợp với tất cả các ứng dụng được ký bằng chứng nhận có dấu vân tay:

E9:2C:A5:2E:80:79:FF:CD:4B:DB:25:B0:8D:7C:AA:CE

Đây là bố cục xml mẫu để bạn bắt đầu tìm hiểu về ánh xạ:

<com.google.android.maps.MapView

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:apiKey="0qM3SvB2qp0QntwmC_nS582rZSmG8WYSBXteEGg"

them vào maníet.xml dòng sau :

<uses-library android:name = “com.google.android.maps”/>

(nằm trong tab <application> </application>)

Activity extends MapActivity

2. JAVA MAP

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

public class MapExample {

    public static void main(String[] args) {

        Map<Object,String> mp=new HashMap<Object, String>();

        // adding or set elements in Map by put method key and value pair

        mp.put(new Integer(2), "Two");

        mp.put(new Integer(1), "One");

        mp.put(new Integer(3), "Three");

        mp.put(new Integer(4), "Four");

        //Get Map in Set interface to get key and value

        Set s=mp.entrySet();

        //Move next key and value of Map by iterator

        Iterator it=s.iterator();

        while(it.hasNext())

            // key=value separator this by Map.Entry to get key and value

            Map.Entry m =(Map.Entry)it.next();

            // getKey is used to get key of Map

            int key=(Integer)m.getKey();

            // getValue is used to get value of key in Map

            String value=(String)m.getValue();

            System.out.println("Key :"+key+"  Value :"+value);

3. Google Analytics SDK for Android

https://developers.google.com/analytics/devguides/collection/android/devguide?hl=vi-VN

4. Tabhost extend activity

tabHost = (TabHost) findViewById(R.id.tabhost);

mLocalActivityManager = new LocalActivityManager(this, false);

mLocalActivityManager.dispatchCreate(savedInstanceState);

tabHost.setup(mLocalActivityManager);

Check Permisstion:

if (context.checkCallingOrSelfPermission(Manifest.permission.INTERNET)

!= PackageManager.PERMISSION_GRANTED) {

- Handle and Thead

private Handler messageHandler = new Handler() {
};

public void handleMessage(Message msg) {
super.handleMessage(msg);
progressDialog.dismiss();
}

start = (Button) findViewById(R.id.Button01);

start.setOnClickListener(new OnClickListener() {});

@Override
public void onClick(View arg0) {
fetchData();
}

protected void fetchData() {

progressDialog = ProgressDialog.show(this, "", "Doing...");

new Thread() {

public void run() {
try {
Thread.sleep(800);} catch (InterruptedException e) {
}
messageHandler.sendEmptyMessage(0);
}

}.start();
}

---- get Name class strong intent:

intent.getComponent().getClassName()

Beyond Compare

-Background and text, back ground

Textcolor : #ffff, textsize 18dp, textstyle bold

Date:

Calendar c = Calendar.getInstance();

int day = c.get(Calendar.DATE) ;

read write file:

File root = new File(Environment.getExternalStorageDirectory(), "Notes");

if(!root.exists()){

root.mkdirs();

}

File mFile = new File(root, path);

FileWriter mFileWriter = new FileWriter(mFile);

BufferedWriter buff = new BufferedWriter(mFileWriter);

buff.append(text);

buff.newLine();

buff.close();

File root = new File(Environment.getExternalStorageDirectory(), "Notes");

if(!root.exists()){

root.mkdirs();

}

File mFile = new File(root, filename);

StringBuilder sText = new StringBuilder();

BufferedReader br = new BufferedReader(new FileReader(mFile));

String line;

while((line = br.readLine())!= null){

sText.append(line);

}

return sText.toString();

Export ko co SVN: team -> export

XML design:

Set textsize : 12 sp

Set margin : 12dp

Background – mau nen trong suot : android:background="#a0000000"

Background-mau nen den/trang : android:background="@android:drawable/alert_light_frame"/android:background="@android:drawable/alert_dark_frame"

- To call again click of button : call function: performClick();

Mang:

View... buttons ====== ArrayList<View>buttons;

String… arrString ====== ArrayList<String>arrString;

Trong ham static, cac doi so trong ay phai static, co cach nao truyen ham thuong vao static.

public class ResourceManager {

private static final String TAG = "ResourceManager";

private static ResourceManager instance = null;

Context context;

static ResourceManager createInstance(Context context){

instance = new ResourceManager(context);

return instance;

}

public static ResourceManager getInstance(){

return instance;

}

private ResourceManager(Context context){

this.context = context;;

}

- Get String from string.xml:

context.getString(R.string.GA);

- Lay color trong android mac dinh:

android:textColor="@android:color/white"

// chan hien thi ban phim vao edittext;

this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

hide ban phim ao tren edittext khi click vao button

InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

inputMethodManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);

- Alert Dialog Builder

private void saveLyric() {

AlertDialog.Builder lAlertDialog = new AlertDialog.Builder(

NewActivity2.this);

lAlertDialog.setTitle("Save action");

lAlertDialog.setCancelable(true);

lAlertDialog.setPositiveButton("OK",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialogInterface, int i) {

Toast.makeText(getApplicationContext(),

"Selected item: " + i, Toast.LENGTH_SHORT)

.show();

}

});

lAlertDialog.setNegativeButton("Cancel",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialogInterface, int i) {

}

});

lAlertDialog.setIcon(R.drawable.save_icon);

lAlertDialog.show();

}

tabHost nam duoi xml

<?xml version="1.0" encoding="utf-8"?>

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

android:id="@android:id/tabhost"