ANDROID: APP DOWNLOADER

 

APP DOWNLOADER

/SRC

MainActivity.java

 

package com.cample.appdownloader;

 

import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.AsyncTask;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.View;

import android.widget.Toast;

 

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

 

public class MainActivity extends Activity {

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

 

    }

 

    final static String APK_NAME = "MyDemoApp.apk";

    public static final String TAG = MainActivity.class.getSimpleName();

 

               /** The URL for the target app that we want to download and install */

    public static final String HTTP_DEV_MY_INSTALLEE_URL =

            "http://darwinsys.com/tmp/" + APK_NAME;

 

    final String downloadPath = Environment.getExternalStorageDirectory() + "/download/";

    final File file = new File(downloadPath);

    final File outputFile = new File(file, APK_NAME);

 

    public void doDelete(View v) {

        if (outputFile.exists()) {

            if (outputFile.delete()) {

                Toast.makeText(this, "Deleted", Toast.LENGTH_SHORT).show();

            } else {

                Toast.makeText(this, "Failed to Delete", Toast.LENGTH_SHORT).show();

            }

        } else{

            Toast.makeText(this, "NO FILE", Toast.LENGTH_SHORT).show();

        }

    }

 

    public void doDownload(View v) {

        new MyInstallTask().execute(HTTP_DEV_MY_INSTALLEE_URL);

    }

 

    public class MyInstallTask extends AsyncTask<String, Integer, Boolean> {

 

        /** Show spinner progresss */

        @Override

        protected void onPreExecute() {

            MainActivity.this.setProgressBarIndeterminateVisibility(true);

        }

 

        // Do the download

        @Override

        protected Boolean doInBackground(String... strings) {

            String apkUrl = strings[0];

            try {

 

                if (!outputFile.exists()) {

                    notifyFromBackground("Downloading...");

                    URL url = new URL(apkUrl);

                    HttpURLConnection c = (HttpURLConnection) url.openConnection();

                    c.setDoOutput(true);

                    c.connect();

 

                    file.mkdirs();

                    FileOutputStream fos = new FileOutputStream(outputFile);

 

                    InputStream is = c.getInputStream();

 

                    byte[] buffer = new byte[2048];

                    int len1 = 0;

                    while ((len1 = is.read(buffer)) != -1) {

                        fos.write(buffer, 0, len1);

                    }

                    fos.close();

                    is.close();

                }

 

                // Do the install

                notifyFromBackground("Installing...");

                Intent promptInstall = new Intent(Intent.ACTION_VIEW)

                        .setDataAndType(Uri.fromFile(outputFile),

                                "application/vnd.android.package-archive");

                startActivity(promptInstall);

 

            } catch (Exception e) {

                Log.e(TAG, "Caught unexpected IOException: " + e, e);

                return false;

            }

            return true;

        }

 

        @Override

        protected void onPostExecute(Boolean b) {

            MainActivity.this.setProgressBarIndeterminateVisibility(false);

        }

    }

 

    /** Really should use a spinner to notify of progress; this will do for a quick demo */

    private void notifyFromBackground(final String mesg) {

        runOnUiThread(new Runnable() {

            public void run() {

                Toast.makeText(MainActivity.this, mesg, Toast.LENGTH_SHORT).show();

            }

        });

    }

}

/RES/LAYOUT

activity_main.xml

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

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    tools:context="com.cample.appdownloader">

 

    <TextView

        android:text="@string/hello_world"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/textView" />

 

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Delete"

        android:onClick="doDelete"

        android:layout_below="@+id/textView"

        android:layout_alignParentLeft="true"

        android:layout_alignParentStart="true"

        android:layout_marginTop="101dp" />

 

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Download"

        android:onClick="doDownload"

        android:layout_centerVertical="true"

        android:layout_alignParentLeft="true"

        android:layout_alignParentStart="true" />

 

 

</RelativeLayout>

RES/VALUES

String.xml

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

<resources>

 

    <string name="app_name">AppDownloader</string>

    <string name="hello_world">Hello world!</string>

    <string name="action_settings">Settings</string>

 

</resources>

 

 

 

AndroidManifest.xml

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

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

    package="com.cample.appdownloader" >

 

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

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

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

 

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name">

        <activity

            android:name="com.cample.appdownloader.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

 

</manifest>