Copy bitmap using getPixels() and setPixels()

Example of copy bitmap using Bitmap.getPixels() and Bitmap.setPixels().

package com.AndroidCopyBitmap;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.widget.ImageView;

public class AndroidCopyBitmapActivity extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       ImageView image1 = (ImageView)findViewById(R.id.image1);
       ImageView image2 = (ImageView)findViewById(R.id.image2);
      
       Bitmap oldBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
      
       int orgWidth = oldBitmap.getWidth();
       int orgHeight = oldBitmap.getHeight();
       
       Bitmap newBitmap = Bitmap.createBitmap(orgWidth, orgHeight, Bitmap.Config.ARGB_8888);
       int[] pixels = new int[orgWidth * orgHeight];
       oldBitmap.getPixels(pixels, 0, orgWidth, 0, 0, orgWidth, orgHeight);
       newBitmap.setPixels(pixels, 0, orgWidth, 0, 0, orgWidth, orgHeight);
       
       image1.setImageBitmap(oldBitmap);
       image2.setImageBitmap(newBitmap);
   }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >

   <TextView
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="@string/hello" />
   <ImageView
       android:id="@+id/image1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content" />
   <ImageView
       android:id="@+id/image2"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content" />

</LinearLayout>

next:
- Copy part of Bitmap

Scale Bitmap

To scale bitmap, we can use the following code:
Matrix matrix = new Matrix();
matrix.postScale(xScale, yScale);
Bitmap newBitmap = Bitmap.createBitmap(oldBitmap, 0, 0, orgWidth, orgHeight, matrix, true);

example:

package com.AndroidScaleBitmap;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.widget.ImageView;

public class AndroidScaleBitmapActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ImageView image1 = (ImageView)findViewById(R.id.image1);
        ImageView image2 = (ImageView)findViewById(R.id.image2);
        
        Bitmap oldBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
        
        int orgWidth = oldBitmap.getWidth();
        int orgHeight = oldBitmap.getHeight();
        int newWidth = 300;
        int newHeight = 300;
        float xScale = newWidth/orgWidth;
        float yScale = newHeight/orgHeight;
        
        Matrix matrix = new Matrix();
        matrix.postScale(xScale, yScale);
        Bitmap newBitmap = Bitmap.createBitmap(oldBitmap, 0, 0, orgWidth, orgHeight, matrix, true);
        
        image1.setImageBitmap(oldBitmap);
        image2.setImageBitmap(newBitmap);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <ImageView
        android:id="@+id/image1" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <ImageView
        android:id="@+id/image2" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Dynamic change the content of Spinner

In the last post Apply List to Spinner, the content of Spinner is come from a List. We can change the List programmatically, to change the content of the Spinner, then call notifyDataSetChanged() of the ArrayAdapter to update the Spinner.

It's a example modify from the last post. There are two Spinner. When the Move button clicked, the current item of Spinner1 will be moved to Spinner2.

package com.AndroidListSpinner;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;

public class AndroidListSpinnerActivity extends Activity {
 
 Button btnMove;
 Spinner MySpinner1, MySpinner2;
 List<String> myList1, myList2;
 private ArrayAdapter<String> myAdapter1, myAdapter2;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btnMove = (Button)findViewById(R.id.move);
        MySpinner1 = (Spinner)findViewById(R.id.myspinner1);
        MySpinner2 = (Spinner)findViewById(R.id.myspinner2);
        
        initList();
        myAdapter1 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, myList1);
        myAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        MySpinner1.setAdapter(myAdapter1);
        
        myAdapter2 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, myList2);
        myAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        MySpinner2.setAdapter(myAdapter2);

        btnMove.setOnClickListener(MoveOnClickListener);
    }
    
    Button.OnClickListener MoveOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   int pos = MySpinner1.getSelectedItemPosition();
   
   if(pos != AdapterView.INVALID_POSITION){
    myList2.add(myList1.get(pos));
    myList1.remove(pos);
    myAdapter1.notifyDataSetChanged();
    myAdapter2.notifyDataSetChanged();
   }
  }};
    
    void initList(){
     myList1 = new ArrayList<String>();
     myList1.add("Sunday");
     myList1.add("Monday");
     myList1.add("Tuesday");
     myList1.add("Wednesday");
     myList1.add("Thursday");
     myList1.add("Friday");
     myList1.add("Saturday");
     
     myList2 = new ArrayList<String>();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <Spinner
        android:id="@+id/myspinner1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Spinner
        android:id="@+id/myspinner2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/move"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:text="Move" />

</LinearLayout>

Apply List to Spinner

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <Spinner
        android:id="@+id/myspinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

package com.AndroidListSpinner;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class AndroidListSpinnerActivity extends Activity {
 
 Spinner MySpinner;
 List<String> myList;
 private ArrayAdapter<String> myAdapter;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        MySpinner = (Spinner)findViewById(R.id.myspinner);
        
        initList();
        myAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, myList);
        myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        MySpinner.setAdapter(myAdapter);
    }
    
    void initList(){
     myList = new ArrayList<String>();
     myList.add("Sunday");
     myList.add("Monday");
     myList.add("Tuesday");
     myList.add("Wednesday");
     myList.add("Thursday");
     myList.add("Friday");
     myList.add("Saturday");
    }
}

Related Post:
- Apply array to Spinner
- Dynamic change the content of Spinner

Remove from DownloadManager

Modify from last post Download using DownloadManager, the downloaded SUCCESSFUL id can be removed using downloadManager.remove(downloadID).

package com.AndroidDownload;

import java.io.FileNotFoundException;

import android.app.Activity;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class AndroidDownloadActivity extends Activity {
 
 String Download_path = "http://goo.gl/Mfyya";
 String Download_ID = "DOWNLOAD_ID";
 
 SharedPreferences preferenceManager;
 DownloadManager downloadManager;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        preferenceManager = PreferenceManager.getDefaultSharedPreferences(this);
        downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
        
        Button btnDownload = (Button)findViewById(R.id.download);
        btnDownload.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Uri Download_Uri = Uri.parse(Download_path);
    DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
    long download_id = downloadManager.enqueue(request);
    
    //Save the download id
    Editor PrefEdit = preferenceManager.edit();
    PrefEdit.putLong(Download_ID, download_id);
    PrefEdit.commit();
   }});
    }
    
 @Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  
  IntentFilter intentFilter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
  registerReceiver(downloadReceiver, intentFilter);
 }

 @Override
 protected void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  
  unregisterReceiver(downloadReceiver);
 }

 private BroadcastReceiver downloadReceiver = new BroadcastReceiver() {

  @Override
  public void onReceive(Context arg0, Intent arg1) {
   // TODO Auto-generated method stub
   DownloadManager.Query query = new DownloadManager.Query();
   query.setFilterById(preferenceManager.getLong(Download_ID, 0));
   Cursor cursor = downloadManager.query(query);
   
   if(cursor.moveToFirst()){
    int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
    int status = cursor.getInt(columnIndex);
    int columnReason = cursor.getColumnIndex(DownloadManager.COLUMN_REASON);
    int reason = cursor.getInt(columnReason);
    
    if(status == DownloadManager.STATUS_SUCCESSFUL){
     //Retrieve the saved download id
     long downloadID = preferenceManager.getLong(Download_ID, 0);
     
     ParcelFileDescriptor file;
     try {
      file = downloadManager.openDownloadedFile(downloadID);
      Toast.makeText(AndroidDownloadActivity.this, 
        "File Downloaded: " + file.toString(), 
        Toast.LENGTH_LONG).show();
     } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      Toast.makeText(AndroidDownloadActivity.this, 
        e.toString(), 
        Toast.LENGTH_LONG).show();
     }
     
     downloadManager.remove(downloadID);
     
    }else if(status == DownloadManager.STATUS_FAILED){
     Toast.makeText(AndroidDownloadActivity.this, 
       "FAILED!\n" + "reason of " + reason, 
       Toast.LENGTH_LONG).show();
    }else if(status == DownloadManager.STATUS_PAUSED){
     Toast.makeText(AndroidDownloadActivity.this, 
       "PAUSED!\n" + "reason of " + reason, 
       Toast.LENGTH_LONG).show();
    }else if(status == DownloadManager.STATUS_PENDING){
     Toast.makeText(AndroidDownloadActivity.this, 
       "PENDING!", 
       Toast.LENGTH_LONG).show();
    }else if(status == DownloadManager.STATUS_RUNNING){
     Toast.makeText(AndroidDownloadActivity.this, 
       "RUNNING!", 
       Toast.LENGTH_LONG).show();
    }
   }
  }
  
 };

}