download from link

how to download from link


main activity

public class MainActivity extends AppCompatActivity {
    EditText mUrlEt;    Button mDownloadBtn;    private static  final int PERMISSION_STORAGE_CODE=1000;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mUrlEt =findViewById(R.id.urlEt);        mDownloadBtn=findViewById(R.id.downloadUrl);
        mDownloadBtn.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                //if OS is Marshmallow or above handle runtime permission                if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
                    if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)== PackageManager.PERMISSION_DENIED){
                //pending denied request it                        String[] permission ={Manifest.permission.WRITE_EXTERNAL_STORAGE};                        //show popup for runtime permission                        requestPermissions(permission,PERMISSION_STORAGE_CODE);                }else {
                    //permission already granted, perform download                        startDownloading();
                }

            }else {
                    //permission already granted, perform download                    startDownloading();                }
            }
        });    }
    private  void startDownloading(){
        String url = mUrlEt.getText().toString().trim();        //create download request        DownloadManager.Request request =new DownloadManager.Request(Uri.parse(url));        //allow types of network to download file        request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI |
                DownloadManager.Request.NETWORK_MOBILE);        request.setTitle("Download");//set title in download notification        request.setDescription("Downloading file...");//set description in download notification        request.allowScanningByMediaScanner();        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_ONLY_COMPLETION);        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,""+System.currentTimeMillis());//get current timestamp as file name
        //get download  service and enque file        DownloadManager manager=(DownloadManager)getSystemService(Context.DOWNLOAD_SERVICE);        manager.enqueue(request);

    }
    //handel permission result
    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode){
            case PERMISSION_STORAGE_CODE:{
                if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
                    startDownloading();                }else{
                    Toast.makeText(this,"Permission",Toast.LENGTH_SHORT).show();

                }

            }
        }
    }
}
XML file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">
    <!--EditText: Input Url -->    <EditText        android:id="@+id/urlEt"        android:hint="Enter url.."        android:layout_width="match_parent"        android:layout_height="wrap_content"/>
    <!--Button Download file from Url-->    <Button        android:id="@+id/downloadUrl"        android:text="Download"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"/>

</RelativeLayout>
Manifest file
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.para.download"><uses-permission android:name="android.permission.INTERNET"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>


    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application>
</manifest>
Pdf in app
add this in build.gradel
implementation 'com.github.barteksc:android-pdf-viewer:3.0.0-beta.5'
go to new and add folder asset 
now paste pdf here
main activity
@Overrideprotected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    //PDF View    PDFView pdfView = findViewById(R.id.pdfView);    pdfView.fromAsset("abc.pdf")
            .enableSwipe(true) // allows to block changing pages using swipe            .swipeHorizontal(false)
            .enableDoubletap(true)
            .defaultPage(0)
            .enableAnnotationRendering(false) // render annotations (such as comments, colors or forms)            .password(null)
            .scrollHandle(null)
            .enableAntialiasing(true) // improve rendering a little bit on low-res screens            // spacing between pages in dp. To define spacing color, set view background            .spacing(0)
            .pageFitPolicy(FitPolicy.WIDTH)
            .load();}
xml file
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">
    <com.github.barteksc.pdfviewer.PDFView        android:id="@+id/pdfView"        android:layout_width="match_parent"        android:layout_height="match_parent"/>
</LinearLayout>
open only when internet is on
main activity
public class MainActivity extends AppCompatActivity {

       @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);           ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);           android.net.NetworkInfo wifi = cm
                   .getNetworkInfo(ConnectivityManager.TYPE_WIFI);           android.net.NetworkInfo datac = cm
                   .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);           if ((wifi != null & datac != null)
                   && (wifi.isConnected() | datac.isConnected())) {
               //connection is avlilable           }else{
               //no connection               Toast toast = Toast.makeText(getApplicationContext(), "No Internet Connection",                       Toast.LENGTH_LONG);               toast.show();           }
    }
}
manifest file
<uses-permission android:name="android.permission.INTERNET"/><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

rewarded video advertisement
used this on dependencies
implementation 'com.google.android.gms:play-services-ads:19.2.0'
main activity
public class MainActivity extends AppCompatActivity implements RewardedVideoAdListener {

    private RewardedVideoAd mAd;
    private TextView mText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mText=(TextView)findViewById(R.id.textView);

        MobileAds.initialize(getApplicationContext(),"ca-app-pub-3940256099942544~3347511713");

        mAd=MobileAds.getRewardedVideoAdInstance(this);
        mAd.setRewardedVideoAdListener(this);
        loadRewardedVideoAd();

    }

    private void loadRewardedVideoAd(){
        if(!mAd.isLoaded()){
            mAd.loadAd("ca-app-pub-3940256099942544/5224354917",new AdRequest.Builder().build() );
        }
    }

    public void startVideo(View view) {
        if(mAd.isLoaded()){
            mAd.show();
        }
    }

    @Override
    public void onRewardedVideoAdLoaded() {

    }

    @Override
    public void onRewardedVideoAdOpened() {

    }

    @Override
    public void onRewardedVideoStarted() {

    }

    @Override
    public void onRewardedVideoAdClosed() {

        loadRewardedVideoAd();

    }

    @Override
    public void onRewarded(RewardItem rewardItem) {
        mText.setText("Available Coins :15");

    }

    @Override
    public void onRewardedVideoAdLeftApplication() {

    }

    @Override
    public void onRewardedVideoAdFailedToLoad(int i) {

    }

    @Override
    public void onRewardedVideoCompleted() {

    }
    @Override
    protected void onPause(){
        mAd.pause(this);
        super.onPause();
    }

    @Override
    protected void onResume() {
        mAd.resume(this);
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        mAd.destroy(this);
        super.onDestroy();
    }
}
public class MainActivity extends AppCompatActivity {
     private final String CHANNEL_ID="personal_notification";
     private final int NOTIFICATION_ID=001;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void displayNotification(View view){
        creatNotificationChannel();

        Intent landingIntent =new Intent(this,LandingActivity.class);
        landingIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TASK);

        PendingIntent landingPendingIntent =PendingIntent.getActivity(this,0,landingIntent,PendingIntent.FLAG_ONE_SHOT);

        NotificationCompat.Builder builder= new NotificationCompat.Builder(this,CHANNEL_ID);
        builder.setSmallIcon(R.drawable.ic_sms_notification);
        builder.setContentTitle("simple Notification");
        builder.setContentText("This is a simple notification");
        builder.setPriority(NotificationCompat.PRIORITY_DEFAULT);
        builder.setContentIntent(landingPendingIntent);
        builder.setAutoCancel(true);
        NotificationManagerCompat notificationManagerCompat=NotificationManagerCompat.from(this);
        notificationManagerCompat.notify(NOTIFICATION_ID,builder.build());
    }

    private  void creatNotificationChannel()
    {
        if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O)
        {
            CharSequence name="Personal Notification";
            String descriprtion="Include all the personal notification";
            int importance= NotificationManager.IMPORTANCE_DEFAULT;

            NotificationChannel notificationChannel= new NotificationChannel(CHANNEL_ID,name,importance);

            notificationChannel.setDescription(descriprtion);
            NotificationManager notificationManager=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            notificationManager.createNotificationChannel(notificationChannel);
        }
    }

}
landing activity
public class LandingActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_landing);
    }
}
xml file(main activity)
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="125dp"
        android:layout_height="61dp"
        android:layout_marginTop="292dp"

        android:onClick="displayNotification"
        android:text="display notification"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
xml file(landing activity)
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".LandingActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="255dp"
        android:layout_height="72dp"
        android:layout_marginTop="276dp"
        android:text="Landing activity"
        android:textSize="35dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

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