android set the background for help

            
I said a little detail: When the main interface, I set up a replacement of the main interface buttons, indeed by setBackgroundResource (R.drawable.bgimg2); can successfully set the background, but now I have one demand: open the phone sd card Pictures displayed in another activity, the user after long press pictures, pop-up dialog box: Set the main interface background, but by setBackgroundResource (R.drawable.bgimg2); This code can not modify the background of the main interface, ask how to solve ?
Reply:
R.drawable.bgimg2 applications engineering drawable resource, which is a resource mapping android, you have to reality sd card in the picture, the picture can only speak for the drawabel then loaded to achieve
by setBackgroundDrawable/ **
* Generated picture
*
* @ Param path
* @ Return
* /
public static Bitmap creatBitmap (String path) {
if (path == null | | path.equals ("")) {
return null;
}
BitmapFactory.Options options = new BitmapFactory.Options ();
options.inPurgeable = true;
try {
Bitmap bitmap = BitmapFactory.decodeFile (path);
RocLog.info ("ViewUtil", "@ @ creatBitmap @ @ the is bitmap:" + bitmap);
return bitmap;
} Catch (Exception e) {
/ / TODO auto-generated catch block
e.printStackTrace ();
}
return null;
}

setBackgroundDrawable (new BitmapDrawable (creatBitmap (path)));
Reply:
Thank you for your answer, I tried this method, so there is no effect, but thanks for your advice
Reply:
Communication between the two Activity Through Intent, you can set startActivityForResult, to automatically set by the return code
Or use the Service and the broadcast can be achieved
Reply:
bttton.setBackgroundDrawable (new BitmapDrawable (BitmapFactory.decodeFile (SD card path)));
Reply:
First, this need not broadcast it. Pass an object can be resolved. .
Wrote a simple example. .
Click btn1 change the background to achieve the effect of

 
package com.lxl.testapp; 

import java.io.IOException; 
import java.io.InputStream; 
import java.util.List; 

import android.app.Activity; 
import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.content.Context; 
import android.content.Intent; 
import android.content.pm.PackageInfo; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.ViewGroup.LayoutParams; 
import android.view.WindowManager; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.RelativeLayout; 

public class MainActivity extends Activity {
Context context; 
private NotificationManager mNotificationManager; / / notification management 
int NOTIFICATIONS_ID = 111; 
@ Override 
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
this.context = this; 
Log.e ("TEST", "MainActivity start"); 

setContentView (R.layout.activity_main); 
/ / ImageView i = new ImageView (this); 
/ / I.setBackgroundResource (R.drawable.showicon); 

/ / WindowManager wm = (WindowManager) context.getSystemService (context.WINDOW_SERVICE); 
/ / Wm.addView (i, new WindowManager.LayoutParams (-1, -1)); 

List  packs = context.getPackageManager () 
. GetInstalledPackages (0); 
mNotificationManager = (NotificationManager) getSystemService (NOTIFICATION_SERVICE); / / Initialization Manager 

final RelativeLayout r = (RelativeLayout) findViewById (R.id.layout); 


final WaitDialog waitDialog = new WaitDialog (context); 


Button btn1 = (Button) findViewById (R.id.btn1); 
btn1.setOnClickListener (new OnClickListener () {

@ Override 
public void onClick (View v) {
InputStream open = null; 
try {
open = context.getResources () getAssets () open ("showicon.png");.. 
} Catch (IOException e) {
/ / TODO Auto-generated catch block 
e.printStackTrace (); 
} 
Drawable d = Drawable.createFromStream (open, "showicon.png"); 
r.setBackground (d); 
} 
}); 

Button btn2 = (Button) findViewById (R.id.btn2); 
btn2.setOnClickListener (new OnClickListener () {

@ Override 
public void onClick (View v) {
Intent i = new Intent (); 
i.setClass (context, MyActivity.class); 
context.startActivity (i); 
} 
}); 

Button btn3 = (Button) findViewById (R.id.btn3); 
btn3.setOnClickListener (new OnClickListener () {

@ Override 
public void onClick (View v) {
setWeather ("information", "title", "content", R.drawable.showicon); 

} 
}); 
} 

@ Override 
protected void onDestroy () {
Log.e ("TEST", "MainActivity end"); 
super.onDestroy (); 
} 

private void setWeather (String tickerText, String title, String content, 
int drawable) {
/ / Create an instance of the notification, the first parameter is the picture, the title bar displays the text a second, and the third is the time 
Notification noti = new Notification (drawable, tickerText, 
System.currentTimeMillis ()); 
/ / When you click the drop-down down title when do here is to jump to the main interface. Here and below are together. 
PendingIntent contentIntent = PendingIntent.getActivity (this, 0, 
new Intent (), 0); 
/ / Set the style, the default is the sound 
noti.defaults = Notification.DEFAULT_SOUND; 
/ / Title is to pull down the title, content Content is also a drop-down display after 
noti.setLatestEventInfo (this, title, content, contentIntent); 
/ / Show this notice 
mNotificationManager.notify (NOTIFICATIONS_ID, noti); 
} 

}