Chèn quảng cáo banner cho Android

+ Build.Gradle :

implementation 'com.google.android.gms:play-services-ads:15.0.0'

+ AndroidManifest :

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

<meta-data    android:name="com.google.android.gms.ads.APPLICATION_ID"    android:value="[ca-app-pub-6969222413270843~1915825861]"/>

+ Layout : 

 <com.google.android.gms.ads.AdView
    xmlns:ads="http://schemas.android.com/apk/res-auto"    android:id="@+id/adView"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_centerHorizontal="true"    android:layout_alignParentBottom="true"    ads:adSize="BANNER"    android:background="@color/colorPrimary"    ads:adUnitId="ca-app-pub-6969222413270843/9657696463">
</com.google.android.gms.ads.AdView>

+ MainActivity : 

private AdView mAdView;

// quang caoMobileAds.initialize(this, "ca-app-pub-6969222413270843~1915825861");
mAdView = findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);

Android Shared preferences example

SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
 editor.putString("name", "Elena");
 editor.putInt("idName", 12);
 editor.apply();

SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE); 
String restoredText = prefs.getString("text", null);
if (restoredText != null) {
  String name = prefs.getString("name", "No name defined");//"No name defined" is the default value.
  int idName = prefs.getInt("idName", 0); //0 is the default value.
}

Mở và tắt service ngầm

startservice.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        startService(new Intent(getBaseContext(), MyService.class));
    }
});

stopservice.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        stopService(new Intent(getBaseContext(), MyService.class));
    }
});

Lấy thời gian trong Java – Time in Java

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import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; class TimeInJava{     public static void main(String[] args){         long start, end;                   start = System.nanoTime();  // start lấy thời gian theo nanosecond         for (int i=0; i<100; i++);         end = System.nanoTime();    // start lấy thời gian theo nanosecond         System.out.println("Time Nano: " + (end - start));                   start = System.currentTimeMillis(); // start lấy thời gian theo millisecond         for (long i=0; i<100000000; i++);    //vòng lặp không thực hiện thêm lệnh nào         end = System.currentTimeMillis();   // start lấy thời gian theo millisecond         System.out.println("Time Millis: " + (end - start));                   DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");         // tạo 1 đối tượng có định dạng thời gian yyyy-MM-dd HH:mm:ss         Date date = new Date(); // lấy thời gian hệ thống         String stringDate = dateFormat.format(date);//Định dạng thời gian theo trên         System.out.println("Date: " + stringDate);     } }




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