Create mirror bitmap with matrix

To create mirror bitmap with matrix:

     Matrix matrixMirror = new Matrix(); 
     matrixMirror.preScale(-1.0f, 1.0f);
     bitmapMaster = Bitmap.createBitmap(
       tempBitmap, 
       0, 
       0, 
       tempBitmap.getWidth(), 
       tempBitmap.getHeight(), 
       matrixMirror, 
       false);

package com.example.androiddrawbitmap;

import java.io.FileNotFoundException;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 Button btnLoadImage;
 TextView textSource;
 ImageView imageResult;
 
 final int RQS_IMAGE1 = 1;

 Uri source;
 Bitmap bitmapMaster;
 Canvas canvasMaster;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  btnLoadImage = (Button)findViewById(R.id.loadimage);
  textSource = (TextView)findViewById(R.id.sourceuri);
  imageResult = (ImageView)findViewById(R.id.result);
  
  btnLoadImage.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    Intent intent = new Intent(Intent.ACTION_PICK,
      android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, RQS_IMAGE1);
   }});
  
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  
  Bitmap tempBitmap;
  
  if(resultCode == RESULT_OK){
   switch (requestCode){
   case RQS_IMAGE1:
    source = data.getData();
    textSource.setText(source.toString());
    
    try {
     tempBitmap = BitmapFactory.decodeStream(
       getContentResolver().openInputStream(source));
     
     Matrix matrixMirror = new Matrix(); 
     matrixMirror.preScale(-1.0f, 1.0f);
     bitmapMaster = Bitmap.createBitmap(
       tempBitmap, 
       0, 
       0, 
       tempBitmap.getWidth(), 
       tempBitmap.getHeight(), 
       matrixMirror, 
       false);
     
     imageResult.setImageBitmap(bitmapMaster);
     
    } catch (FileNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    
    break;
   }
  }
 }

}

<LinearLayout 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:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/loadimage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Load Image 1" />

    <TextView
        android:id="@+id/sourceuri"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    
    <ImageView
            android:id="@+id/result"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:background="@android:color/background_dark"
            android:scaleType="centerInside" />

</LinearLayout>

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Next: Create upside down bitmap with matrix

---

more: Something about processing images in Android

Youtube 1980 hidden game

- Play any video in Youtube
- Pause
- type "1980"
- the game will start

Implement callback function with interface

This example demonstrate how to implement callback function with interface.

Create a MyAsyncTask class extends AsyncTask. Inside MyAsyncTask, interface DoSomething declared. MyAsyncTask class handle the background timing only, know knowing about the actual jobs. The actual jobs are in the class implement DoSomething.

package com.example.androidcallback;

import android.os.AsyncTask;
import android.os.SystemClock;

public class MyAsyncTask extends AsyncTask<Void, Void, Void> {

 interface DoSomething {
  void doInBackground(int progress);
  void doPostExecute();
 }

 DoSomething myDoSomethingCallBack;
 int myMax;
 
 MyAsyncTask(DoSomething callback, int max){
  myDoSomethingCallBack = callback;
  myMax = max;
 }

 @Override
 protected Void doInBackground(Void... params) {
  for (int i = 0; i <= myMax; i++) {
   SystemClock.sleep(100);
   myDoSomethingCallBack.doInBackground(i);
  }
  return null;
 }

 @Override
 protected void onPostExecute(Void result) {
  super.onPostExecute(result);
  myDoSomethingCallBack.doPostExecute();
 }

}

MainActivity.java, implements DoSomething. Itself (this) will be passed to MyAsyncTask constructor, to implement callback function.

package com.example.androidcallback;

import com.example.androidcallback.MyAsyncTask.DoSomething;

import android.os.Bundle;
import android.widget.ProgressBar;
import android.widget.Toast;
import android.app.Activity;

public class MainActivity extends Activity implements DoSomething{
 
 ProgressBar myProgressBar;
 MyAsyncTask myAsyncTask;
 int myProgress;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  myProgressBar = (ProgressBar)findViewById(R.id.myprogressbar);
  
  myProgress = 0;
  myAsyncTask = new MyAsyncTask(this, 100);
  myAsyncTask.execute();
 }

 @Override
 public void doInBackground(int i) {
  myProgressBar.setProgress(i);
 }

 @Override
 public void doPostExecute() {
  Toast.makeText(MainActivity.this, 
    "Finish", Toast.LENGTH_LONG).show();
 }

}

layout

<LinearLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />
    
    <ProgressBar 
        android:id="@+id/myprogressbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:max="100"
        android:progress="0" />

</LinearLayout>

Download the files.

Detect touch and draw rect on bitmap

In last example "Detect touch and free draw on Bitmap", the points are drawn on the canvas (also the bitmap) directly when user touch.

In case of drawing square, the user touch on the screen to mark the start position, and move, and release on the end position. We have to keep displaying the updated square. But if we draw the rect on the canvasMaster, it will full of rect when user touch and move.

In this example, we create two overlay ImageViews, have same dimension. Also additional bitmap and canvas for the extra ImagewView. When ACTION_DOWN detected, we mark the starting position. When ACTION_MOVE, we draw rect on the extra canvasDrawingPane, not the canvasMaster. Such that we can clear and re-draw the canvas everytime. And finally when ACTION_UP, simple draw the extra bitmap on canvasMaster.

package com.example.androiddrawbitmap;

import java.io.FileNotFoundException;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 Button btnLoadImage;
 TextView textSource;
 ImageView imageResult, imageDrawingPane;
 
 final int RQS_IMAGE1 = 1;

 Uri source;
 Bitmap bitmapMaster;
 Canvas canvasMaster;
 Bitmap bitmapDrawingPane;
 Canvas canvasDrawingPane;
 projectPt startPt;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  btnLoadImage = (Button)findViewById(R.id.loadimage);
  textSource = (TextView)findViewById(R.id.sourceuri);
  imageResult = (ImageView)findViewById(R.id.result);
  imageDrawingPane = (ImageView)findViewById(R.id.drawingpane);
  
  btnLoadImage.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    Intent intent = new Intent(Intent.ACTION_PICK,
      android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, RQS_IMAGE1);
   }});
  
  imageResult.setOnTouchListener(new OnTouchListener(){

   @Override
   public boolean onTouch(View v, MotionEvent event) {
    
    int action = event.getAction();
    int x = (int) event.getX();
    int y = (int) event.getY();
    switch(action){
    case MotionEvent.ACTION_DOWN:
     textSource.setText("ACTION_DOWN- " + x + " : " + y);
     startPt = projectXY((ImageView)v, bitmapMaster, x, y);
     break;
    case MotionEvent.ACTION_MOVE:
     textSource.setText("ACTION_MOVE- " + x + " : " + y);
     drawOnRectProjectedBitMap((ImageView)v, bitmapMaster, x, y);
     break;
    case MotionEvent.ACTION_UP:
     textSource.setText("ACTION_UP- " + x + " : " + y);
     drawOnRectProjectedBitMap((ImageView)v, bitmapMaster, x, y);
     finalizeDrawing();
     break;
    }
    /*
     * Return 'true' to indicate that the event have been consumed.
     * If auto-generated 'false', your code can detect ACTION_DOWN only,
     * cannot detect ACTION_MOVE and ACTION_UP.
     */
    return true;
   }});
  
 }
 
 class projectPt{
  int x;
  int y;
  
  projectPt(int tx, int ty){
   x = tx;
   y = ty;
  }
 }
 
 private projectPt projectXY(ImageView iv, Bitmap bm, int x, int y){
  if(x<0 || y<0 || x > iv.getWidth() || y > iv.getHeight()){
   //outside ImageView
   return null;
  }else{
   int projectedX = (int)((double)x * ((double)bm.getWidth()/(double)iv.getWidth()));
   int projectedY = (int)((double)y * ((double)bm.getHeight()/(double)iv.getHeight()));

   return new projectPt(projectedX, projectedY);
  }
 }
 
 private void drawOnRectProjectedBitMap(ImageView iv, Bitmap bm, int x, int y){
  if(x<0 || y<0 || x > iv.getWidth() || y > iv.getHeight()){
   //outside ImageView
   return;
  }else{
   int projectedX = (int)((double)x * ((double)bm.getWidth()/(double)iv.getWidth()));
   int projectedY = (int)((double)y * ((double)bm.getHeight()/(double)iv.getHeight()));

   //clear canvasDrawingPane
   canvasDrawingPane.drawColor(Color.TRANSPARENT, Mode.CLEAR);
   
   Paint paint = new Paint();
            paint.setStyle(Paint.Style.STROKE);
            paint.setColor(Color.WHITE);
            paint.setStrokeWidth(3);
   canvasDrawingPane.drawRect(startPt.x, startPt.y, projectedX, projectedY, paint);
   imageDrawingPane.invalidate();
   
   
   textSource.setText(x + ":" + y + "/" + iv.getWidth() + " : " + iv.getHeight() + "\n" +
     projectedX + " : " + projectedY + "/" + bm.getWidth() + " : " + bm.getHeight()
     );
  }
 }
 
 private void finalizeDrawing(){
  canvasMaster.drawBitmap(bitmapDrawingPane, 0, 0, null);
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  
  Bitmap tempBitmap;
  
  if(resultCode == RESULT_OK){
   switch (requestCode){
   case RQS_IMAGE1:
    source = data.getData();
    textSource.setText(source.toString());
    
    try {
     //tempBitmap is Immutable bitmap,
     //cannot be passed to Canvas constructor
     tempBitmap = BitmapFactory.decodeStream(
       getContentResolver().openInputStream(source));
     
     Config config;
     if(tempBitmap.getConfig() != null){
      config = tempBitmap.getConfig();
     }else{
      config = Config.ARGB_8888;
     }
     
     //bitmapMaster is Mutable bitmap
     bitmapMaster = Bitmap.createBitmap(
       tempBitmap.getWidth(),
       tempBitmap.getHeight(),
       config);
     
     canvasMaster = new Canvas(bitmapMaster);
     canvasMaster.drawBitmap(tempBitmap, 0, 0, null);
     
     imageResult.setImageBitmap(bitmapMaster);
     
     //Create bitmap of same size for drawing
     bitmapDrawingPane = Bitmap.createBitmap(
       tempBitmap.getWidth(),
       tempBitmap.getHeight(),
       config);
     canvasDrawingPane = new Canvas(bitmapDrawingPane);
     imageDrawingPane.setImageBitmap(bitmapDrawingPane);
     
     
    } catch (FileNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    
    break;
   }
  }
 }

}

<LinearLayout 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:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/loadimage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Load Image 1" />

    <TextView
        android:id="@+id/sourceuri"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ImageView
            android:id="@+id/result"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:background="@android:color/background_dark"
            android:scaleType="centerInside" />
        <ImageView 
            android:id="@+id/drawingpane"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:scaleType="centerInside"
            android:layout_alignLeft="@id/result"
            android:layout_alignTop="@id/result"
            android:layout_alignRight="@id/result"
            android:layout_alignBottom="@id/result"/>
    </RelativeLayout>

</LinearLayout>

Download the files.

Correction: To make sure bitmapDrawingPane have alpha channel, create it with Config.ARGB_8888.

     //Create bitmap of same size for drawing
     bitmapDrawingPane = Bitmap.createBitmap(
       tempBitmap.getWidth(),
       tempBitmap.getHeight(),
       Config.ARGB_8888);

---

more: Something about processing images in Android

Detect touch and free draw on Bitmap

The previous exercise "Get bitmap color on touched position in ImageView" show how to project touch position on ImageView to underlying bitmap. In this exercise, we are going to draw something on the touch position.

package com.example.androiddrawbitmap;

import java.io.FileNotFoundException;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 Button btnLoadImage;
 TextView textSource, textInfo;
 ImageView imageResult;
 
 final int RQS_IMAGE1 = 1;

 Uri source;
 Bitmap bitmapMaster;
 Canvas canvasMaster;
 

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  btnLoadImage = (Button)findViewById(R.id.loadimage);
  textSource = (TextView)findViewById(R.id.sourceuri);
  imageResult = (ImageView)findViewById(R.id.result);
  
  btnLoadImage.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    Intent intent = new Intent(Intent.ACTION_PICK,
      android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, RQS_IMAGE1);
   }});
  
  imageResult.setOnTouchListener(new OnTouchListener(){

   @Override
   public boolean onTouch(View v, MotionEvent event) {
    
    int action = event.getAction();
    int x = (int) event.getX();
    int y = (int) event.getY();
    switch(action){
    case MotionEvent.ACTION_DOWN:
     textSource.setText("ACTION_DOWN- " + x + " : " + y);
     drawOnProjectedBitMap((ImageView)v, bitmapMaster, x, y);
     break;
    case MotionEvent.ACTION_MOVE:
     textSource.setText("ACTION_MOVE- " + x + " : " + y);
     drawOnProjectedBitMap((ImageView)v, bitmapMaster, x, y);
     break;
    case MotionEvent.ACTION_UP:
     textSource.setText("ACTION_UP- " + x + " : " + y);
     drawOnProjectedBitMap((ImageView)v, bitmapMaster, x, y);
     break;
    }
    /*
     * Return 'true' to indicate that the event have been consumed.
     * If auto-generated 'false', your code can detect ACTION_DOWN only,
     * cannot detect ACTION_MOVE and ACTION_UP.
     */
    return true;
   }});
  
 }
 
 /*
  * Project position on ImageView to position on Bitmap
  * draw on it
  */
 private void drawOnProjectedBitMap(ImageView iv, Bitmap bm, int x, int y){
  if(x<0 || y<0 || x > iv.getWidth() || y > iv.getHeight()){
   //outside ImageView
   return;
  }else{
   int projectedX = (int)((double)x * ((double)bm.getWidth()/(double)iv.getWidth()));
   int projectedY = (int)((double)y * ((double)bm.getHeight()/(double)iv.getHeight()));

   Paint   paint = new Paint();
            paint.setStyle(Paint.Style.FILL);
            paint.setColor(Color.WHITE);
            paint.setStrokeWidth(3);
   canvasMaster.drawCircle(projectedX, projectedY, 5, paint);
   imageResult.invalidate();
   
   textSource.setText(x + ":" + y + "/" + iv.getWidth() + " : " + iv.getHeight() + "\n" +
     projectedX + " : " + projectedY + "/" + bm.getWidth() + " : " + bm.getHeight()
     );
  }
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  
  Bitmap tempBitmap;
  
  if(resultCode == RESULT_OK){
   switch (requestCode){
   case RQS_IMAGE1:
    source = data.getData();
    textSource.setText(source.toString());
    
    try {
     //tempBitmap is Immutable bitmap,
     //cannot be passed to Canvas constructor
     tempBitmap = BitmapFactory.decodeStream(
       getContentResolver().openInputStream(source));
     
     Config config;
     if(tempBitmap.getConfig() != null){
      config = tempBitmap.getConfig();
     }else{
      config = Config.ARGB_8888;
     }
     
     //bitmapMaster is Mutable bitmap
     bitmapMaster = Bitmap.createBitmap(
       tempBitmap.getWidth(),
       tempBitmap.getHeight(),
       config);
     
     canvasMaster = new Canvas(bitmapMaster);
     canvasMaster.drawBitmap(tempBitmap, 0, 0, null);
     
     imageResult.setImageBitmap(bitmapMaster);
    } catch (FileNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    
    break;
   }
  }
 }

}

Refer to the post "Get bitmap color on touched position in ImageView" for the layout file.

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next: Detect touch and draw rect on bitmap

---

more: Something about processing images in Android

Touchmate MID-600 Tablet Firmware.

Touchmate MID-600Android Tablet Firmware . 

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Chipset : Allwinner 

When I need To Flash Tablet ?

1. Forgotten Pattern Lock on Android Tablets. 

2.Too many pattern attempts / Reset user lock.

3. Tablets PC stuck on Gmail account.

4. Android Tablet PC stuck on Android logo.

5. Tablet Android  hang on start-up / Multiple errors generating by OS. 
6. Google play store having problems or generating errors. 
7.Upgrading to new Android version.

you can use this Android Tablet firmware,  ROM to restore your Android China tablets to generic firmwares or upgrades . Make sure to charge battery upto 60%. Power failure during flashing may result dead or broken tablets.

Note : Flashing generic tablet firmware should be last option.

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