saalek110
Well-Known Member
برنامه دانلود و نمایش عکس:
منبع:
Android Network Connection
فایل MainActivity.java:
محتوای:activity_main.xml
محتوای AndroidManifest.xml :
دو خط پرمیشن اضافه شده. اگر نباشه برنامه کار نمی کند.
منبع:
Android Network Connection
فایل MainActivity.java:
JavaScript:
package com.tutorialspoint.myapplication;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.ConnectivityManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class MainActivity extends ActionBarActivity {
private ProgressDialog progressDialog;
private Bitmap bitmap = null;
Button b1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkInternetConenction();
downloadImage("http://www.tutorialspoint.com/green/images/logo.png");
}
});
}
private void downloadImage(String urlStr) {
progressDialog = ProgressDialog.show(this, "", "Downloading Image from " + urlStr);
final String url = urlStr;
new Thread() {
public void run() {
InputStream in = null;
Message msg = Message.obtain();
msg.what = 1;
try {
in = openHttpConnection(url);
bitmap = BitmapFactory.decodeStream(in);
Bundle b = new Bundle();
b.putParcelable("bitmap", bitmap);
msg.setData(b);
in.close();
}catch (IOException e1) {
e1.printStackTrace();
}
messageHandler.sendMessage(msg);
}
}.start();
}
private InputStream openHttpConnection(String urlStr) {
InputStream in = null;
int resCode = -1;
try {
URL url = new URL(urlStr);
URLConnection urlConn = url.openConnection();
if (!(urlConn instanceof HttpURLConnection)) {
throw new IOException("URL is not an Http URL");
}
HttpURLConnection httpConn = (HttpURLConnection) urlConn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
resCode = httpConn.getResponseCode();
if (resCode == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
}catch (MalformedURLException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}
return in;
}
private Handler messageHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
ImageView img = (ImageView) findViewById(R.id.imageView);
img.setImageBitmap((Bitmap) (msg.getData().getParcelable("bitmap")));
progressDialog.dismiss();
}
};
private boolean checkInternetConenction() {
// get Connectivity Manager object to check connection
ConnectivityManager connec
=(ConnectivityManager)getSystemService(getBaseContext().CONNECTIVITY_SERVICE);
// Check for network connections
if ( connec.getNetworkInfo(0).getState() ==
android.net.NetworkInfo.State.CONNECTED ||
connec.getNetworkInfo(0).getState() ==
android.net.NetworkInfo.State.CONNECTING ||
connec.getNetworkInfo(1).getState() ==
android.net.NetworkInfo.State.CONNECTING ||
connec.getNetworkInfo(1).getState() == android.net.NetworkInfo.State.CONNECTED ) {
Toast.makeText(this, " Connected ", Toast.LENGTH_LONG).show();
return true;
}else if (
connec.getNetworkInfo(0).getState() ==
android.net.NetworkInfo.State.DISCONNECTED ||
connec.getNetworkInfo(1).getState() ==
android.net.NetworkInfo.State.DISCONNECTED ) {
Toast.makeText(this, " Not Connected ", Toast.LENGTH_LONG).show();
return false;
}
return false;
}
}
JavaScript:
<?xml version="1.0" encoding="utf-8"?>
<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=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="UI Animator Viewer"
android:id="@+id/textView"
android:textSize="25sp"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Tutorials point"
android:id="@+id/textView2"
android:layout_below="@+id/textView"
android:layout_alignRight="@+id/textView"
android:layout_alignEnd="@+id/textView"
android:textColor="#ff36ff15"
android:textIsSelectable="false"
android:textSize="35dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:layout_below="@+id/textView2"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
android:id="@+id/button"
android:layout_below="@+id/imageView"
android:layout_centerHorizontal="true"
android:layout_marginTop="76dp" />
</RelativeLayout>دو خط پرمیشن اضافه شده. اگر نباشه برنامه کار نمی کند.
JavaScript:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tutorialspoint.myapplication" >
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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>
