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calling a method having parameters context and attributeset from MainActivity

I have an app that displays random characters vertically on the screen (like in the matrix movie) and I would like to add buttons to change the color of these chars when pressed, but I'm unable to call the method setColor of paintTxt variable from MainActivity.
This is my code,
EffetMatrix effetMatrix = new EffetMatrix();//Error in ()
final Paint paintTxt = effetMatrix.paintTxt;
paintTxt.setColor(Color.RED);
But the editor shows an error:
EffetMatrix(Context, AttributSet) in EffetMatrix cannot be applied to ()
the EffetMatrix class code
package com.esqmo.apps.effetmatrix;
import java.util.Random;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import android.content.Context;
import android.widget.Button;
/**
* Created by esQmo on 04/10/2016.
*/
public class EffetMatrix extends View {
private static final Random ALEATOIRE = new Random();
private int larg, haut;
private Canvas toile;
private Bitmap toileBmp;
private int taillePolice = 40;
private int tailleColonne;
private char[] chars = "01".toCharArray();
private int[] posTxtParColonne;
public Paint peindreTxt, peindreArrPlan, peindreArrPlanBmp, peindreInitArrPlan;
public EffetMatrix(Context context, AttributeSet attrs) {
super(context, attrs);
peindreTxt = new Paint();
peindreTxt.setStyle(Paint.Style.FILL);
peindreTxt.setColor(Color.BLUE);
peindreTxt.setTextSize(taillePolice);
peindreArrPlan = new Paint();
peindreArrPlan.setStyle(Paint.Style.FILL);
peindreArrPlan.setColor(Color.BLACK);
peindreArrPlan.setAlpha(5);
peindreArrPlanBmp = new Paint();
peindreArrPlanBmp.setColor(Color.BLACK);
peindreInitArrPlan = new Paint();
peindreInitArrPlan.setColor(Color.BLACK);
peindreInitArrPlan.setAlpha(255);
peindreInitArrPlan.setStyle(Paint.Style.FILL);
}
#Override
protected void onSizeChanged(int l, int h, int ancl, int anch) {
super.onSizeChanged(l, h, ancl, anch);
larg = l;
haut = h;
toileBmp = Bitmap.createBitmap(larg, haut, Bitmap.Config.ARGB_8888);
toile = new Canvas(toileBmp);
toile.drawRect(0, 0, larg, haut, peindreInitArrPlan);
tailleColonne = larg / taillePolice;
posTxtParColonne = new int[tailleColonne + 1];
for (int x = 0; x < tailleColonne; x++) {
posTxtParColonne[x] = ALEATOIRE.nextInt(larg / 2) + 1;
}
}
private void dessineTexte() {
for (int i = 0; i < posTxtParColonne.length; i++) {
toile.drawText("" + chars[ALEATOIRE.nextInt(chars.length)], i * taillePolice,
posTxtParColonne[i] * taillePolice, peindreTxt);
if (posTxtParColonne[i] * taillePolice > larg && Math.random() > 0.980) {
posTxtParColonne[i] = 0;
}
posTxtParColonne[i]++;
}
}
private void dessineToile() {
toile.drawRect(0, 0, larg, haut, peindreArrPlan);
dessineTexte();
}
#Override
protected void onDraw(Canvas toile) {
super.onDraw(toile);
toile.drawBitmap(toileBmp, 0, 0, peindreArrPlanBmp);
dessineToile();
invalidate();
}
public void setCustomColor(int color){
peindreTxt.setColor(color);
invalidate();
}
}
note: variable peindreText = paintText
The main activity code:
package com.esqmo.apps.effetmatrix;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.Paint;
import android.media.effect.Effect;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button boutton_vert = (Button) findViewById(R.id.b_v);
final Button boutton_bleu = (Button) findViewById(R.id.b_b);
final Button boutton_rouge = (Button) findViewById(R.id.b_r);
final Button boutton_rose = (Button) findViewById(R.id.b_ro);
boutton_bleu.setOnClickListener(this);
boutton_vert.setOnClickListener(this);
boutton_rouge.setOnClickListener(this);
boutton_rose.setOnClickListener(this);
}
#Override
public void onClick(View v) {
}
public void passerVert(View v) {
}
public void passerRouge(View v) {
}
public void passerRose(View v) {
}
public void passerBleu(View v) {
}
}
main.xml
<com.esqmo.apps.effetmatrix.EffetMatrix
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/arrPlan"/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:background="#040404"
android:id="#+id/linearLayout">
<Button
android:layout_width="70dp"
android:layout_height="match_parent"
android:text="#string/button_vert"
android:onClick="passerVert"
android:id="#+id/b_v"
android:textAppearance="#android:color/holo_blue_dark" />
<Button
android:layout_width="70dp"
android:layout_height="match_parent"
android:text="#string/button_bleu"
android:onClick="passerBleu"
android:id="#+id/b_b"/>
<Button
android:layout_width="70dp"
android:layout_height="match_parent"
android:text="#string/button_rouge"
android:onClick="passerRouge"
android:id="#+id/b_r" />
<Button
android:layout_width="70dp"
android:layout_height="match_parent"
android:text="#string/button_rouge"
android:onClick="passerRose"
android:id="#+id/b_ro" />
</LinearLayout>
PS: I'm a noob in programming.
Sorry for my english

Don't create a new instance of the custom view again. Instead get a reference to the view using its id.
See the following code,
EffetMatrix effetMatrix = (EffetMatrix) findViewById(R.id.arrPlan);
effetMatrix.setCustomTextColor(Color.RED);
Inside EffetMatrix class create a method named setCustomColor as follows,
class EffetMatrix {
...
public void setCustomTextColor(int color){
// Set the color to the paintTxt object
paintTxt.setColor(color);
// invalidate the view to apply the changes
invalidate();
}
...
}
This is how you implement it in your code,
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
EffetMatrix effetMatrix;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
effetMatrix = (EffetMatrix) findViewById(R.id.arrPlan);
...
}
#Override
public void onClick(View v) {
switch(v.getId()){
case R.id.b_b:
effetMatrix.setCustomTextColor(Color.BLUE);
break;
case R.id.b_r:
effetMatrix.setCustomTextColor(Color.RED);
break;
case R.id.b_ro:
effetMatrix.setCustomTextColor(Color.MAGENTA);
break;
}
}
}

You must invalidate your custom view after changing paint color.
effetMatrix.invalidate();
And if you want to display your custom view in editor you must implement :
public EffetMatrix(Context context) {
this(context, null);
}
public EffetMatrix(Context context, AttributeSet attrs) {
super(context, attrs);
}

If you want to make the buttons do something, then you have to set an onClickListener for each button in your main properly. Here's an example for button_bleu,
Get rid of boutton_bleu.setOnClickListener(this); and replace it with
button_bleu.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
effetMatrix.setCustomColor(Color.BLUE);
}
});
Now just do the same for the other 3 buttons.

How to implement 3d effect zooming in viewpager android

I need help regarding the viewpager. Basically I have a viewpager contained in a page container:
package com.example.CustomViews;
/**
* Created by imrankhan on 4/29/2015.
*/
import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.graphics.Point;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Transformation;
import android.widget.FrameLayout;
import android.widget.ImageView;
import com.example.imrankhan.newlawdojo.DashboardActivity;
import com.example.imrankhan.newlawdojo.QuizActivity;
import com.example.imrankhan.newlawdojo.R;
/**
* PagerContainer: A layout that displays a ViewPager with its children that are outside
* the typical pager bounds.
*/
public class PageContainer extends FrameLayout implements ViewPager.OnPageChangeListener {
private ViewPager mPager;
boolean mNeedsRedraw = false;
private Camera mCamera = new Camera();
private int mMaxRotationAngle = 60;
private int mMaxZoom = -120;
public PageContainer(Context context) {
super(context);
init();
}
public PageContainer(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public PageContainer(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
//Disable clipping of children so non-selected pages are visible
setClipChildren(false);
//Child clipping doesn't work with hardware acceleration in Android 3.x/4.x
//You need to set this value here if using hardware acceleration in an
// application targeted at these releases.
setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
#Override
protected void onFinishInflate() {
try {
mPager = (ViewPager) getChildAt(0);
mPager.setOnPageChangeListener(this);
} catch (Exception e) {
throw new IllegalStateException("The root child of PagerContainer must be a ViewPager");
}
}
public ViewPager getViewPager() {
return mPager;
}
private Point mCenter = new Point();
private Point mInitialTouch = new Point();
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mCenter.x = w / 4;
mCenter.y = h / 4;
}
#Override
public boolean onTouchEvent(MotionEvent ev) {
//We capture any touches not already handled by the ViewPager
// to implement scrolling from a touch outside the pager bounds.
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mInitialTouch.x = (int)ev.getX();
mInitialTouch.y = (int)ev.getY();
default:
ev.offsetLocation(mCenter.x - mInitialTouch.x, mCenter.y - mInitialTouch.y);
break;
}
return mPager.dispatchTouchEvent(ev);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
//Force the container to redraw on scrolling.
//Without this the outer pages render initially and then stay static
if (mNeedsRedraw) invalidate();
}
#Override
public void onPageSelected(int position) {
View v =this.getViewPager().getChildAt(position);
}
private void transformImageBitmap(View child, Transformation t, int rotationAngle) {
mCamera.save();
final Matrix imageMatrix = t.getMatrix();;
final int imageHeight = child.getLayoutParams().height;;
final int imageWidth = child.getLayoutParams().width;
final int rotation = Math.abs(rotationAngle);
mCamera.translate(0.0f, 0.0f, 100.0f);
if ( rotation < mMaxRotationAngle ) {
float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));
mCamera.translate(0.0f, 0.0f, zoomAmount);
}
mCamera.rotateY(rotationAngle);
mCamera.getMatrix(imageMatrix);
imageMatrix.preTranslate(-(imageWidth/2), -(imageHeight/2));
imageMatrix.postTranslate((imageWidth/2), (imageHeight/2));
mCamera.restore();
}
#Override
public void onPageScrollStateChanged(int state) {
mNeedsRedraw = (state != ViewPager.SCROLL_STATE_IDLE);
}
}
on onPageSelected event I got the view I need to zoom in when selected and zoom out after selecting another item. Please help me out. I added an image to give you an idea what I want.
http://i.stack.imgur.com/xtE89.png

Android customview ondraw variable

I have a customview where i display two rectangles. i want to set the height by a variable i sent from the mainactivity.
my customview class is the following.
package com.example.customview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
public class MyView extends View {
Paint paint;
Paint paint2;
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
paint2 = new Paint();
}
#Override
protected void onDraw(Canvas canvas) {
paint.setColor(Color.RED);
paint2.setColor(Color.DKGRAY);
canvas.drawRect(150, 0, 200, 100, paint);
canvas.drawRect(200, 0, 250, 150, paint2);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(400, 300);
}
}
And the mainclass is standard
package com.example.customview;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
how can i change the height from the oncreate or onstart.
Thanks all for helping.

You need create a varibale and set it from Activity. For example:
private int mHeight = 0;
#Override
protected void onDraw(Canvas canvas) {
paint.setColor(Color.RED);
paint2.setColor(Color.DKGRAY);
canvas.drawRect(150, 0, 200, 150 + mHeight, paint);
canvas.drawRect(200, 0, 250, 200 + mHeight, paint2);
}
public void setRectHeight(final int height) {
mHeight = height;
invalidate();
}
And set the height in your activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyView view = (MyView)findViewById(R.id.my_view);
view.setHeight(50);
}

you need to send data from main activity and receive it from MyView. when you create the intent for opening new activity from main use
_YourIntent_.putExtra(_tag_,_yourData_);
startActivityForResult(_YourIntent_, result);
//put extra is simply for sending data, and to receive it the other hand , oncreate use this;
Intent x = getIntent();``
//now get the data
int _yourvariable_ = x.getExtras().getString(_tag_).toint;

Update Canvas and holder

I am starting with canvas and i need help.
I want to represent real times coordinates in a "room". First when i create surfaceholder i draw the "room" and works fine. My idea is represents differents point in this room.
This is my activity:
package com.example.grafica;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.Point;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TableLayout;
import android.widget.TextView;
#TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
public class MainActivity extends Activity {
private LayoutInflater myInflater = null;
private TextView tx1, tx2, tx3, tx4, tx5, tx6, tx7;
float ancho = (float) 5.20;
float largo = (float) 3.50;
private TableLayout table, table2;
private LinearLayout.LayoutParams params, params2;
private MySurface surface;
#Override
protected void onCreate(Bundle savedInstanceState) {
Log.i("telo", "oncreate");
super.onCreate(savedInstanceState);
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
setContentView(R.layout.activity_main);
myInflater = LayoutInflater.from(this);
View overView = myInflater.inflate(R.layout.segundacapa, null);
this.addContentView(overView, new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
}
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
setContentView(R.layout.activity_main);
myInflater = LayoutInflater.from(this);
View overView = myInflater.inflate(R.layout.segundacapaland, null);
this.addContentView(overView, new LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
}
surface =(MySurface)findViewById(R.id.surface);
tx1 = (TextView) findViewById(R.id.textView2);
tx2 = (TextView) findViewById(R.id.textView3);
tx3 = (TextView) findViewById(R.id.textView4);
tx4 = (TextView) findViewById(R.id.textView5);
tx5 = (TextView) findViewById(R.id.textView7);
tx6 = (TextView) findViewById(R.id.textView8);
tx7 = (TextView) findViewById(R.id.textView9);
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
table = (TableLayout) findViewById(R.id.table);
params = (LinearLayout.LayoutParams) table.getLayoutParams();
float ratio = ancho / largo;
float aux = width / ratio;
params.topMargin = (int) aux + 20;
surface.xini = 20;
surface.yini = 20;
surface.xend = width - 20;
surface.yend = aux;
}
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
table2 = (TableLayout) findViewById(R.id.table2);
params2 = (LinearLayout.LayoutParams) table2.getLayoutParams();
float ratio = largo / ancho;
float aux = width / ratio;
params2.leftMargin = (int) (width * ratio) + 20;
surface.xini = 20;
surface.yini = 20;
surface.xend = width * ratio;
surface.yend = height - 220;
}
surface.ini();
surface.update();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent evento) {
return super.onKeyDown(keyCode, evento);
}
}
And this my surface class:
package com.example.grafica;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class MySurface extends SurfaceView implements SurfaceHolder.Callback {
private Paint pincel = new Paint();
private Canvas canvas;
public float xini = 0;
public float yini = 0;
public float xend = 0;
public float yend = 0;
public float coordinatex =(float) 2.50;
public float coordinatety=(float) 1.75;
private SurfaceHolder holder;
public MySurface(Context context, AttributeSet attr) {
super(context,attr);
}
public void ini(){
getHolder().addCallback(this);
}
public void update(){
holder.lockCanvas();
pincel.setColor(Color.BLUE);
pincel.setStrokeWidth(25);
canvas.drawPoint(100, 100, pincel);
holder.unlockCanvasAndPost(canvas);
}
#Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
#Override
public void surfaceCreated(SurfaceHolder arg0) {
holder = arg0;
canvas = arg0.lockCanvas();
canvas.drawColor(Color.WHITE);
pincel.setColor(Color.BLACK);
pincel.setStrokeWidth(8);
pincel.setStyle(Style.STROKE);
RectF rect = new RectF();
rect.set(xini, yini, xend, yend);
canvas.drawRect(rect, pincel);
pincel.setColor(Color.RED);
pincel.setStrokeWidth(25);
canvas.drawPoint(xini, yend, pincel);
pincel.setColor(Color.BLUE);
pincel.setStrokeWidth(25);
canvas.drawPoint(xend, yend, pincel);
pincel.setColor(Color.GREEN);
pincel.setStrokeWidth(25);
canvas.drawPoint(xini, yini, pincel);
pincel.setColor(Color.YELLOW);
pincel.setStrokeWidth(25);
canvas.drawPoint(xend, yini, pincel);
arg0.unlockCanvasAndPost(canvas);
}
#Override
public void surfaceDestroyed(SurfaceHolder arg0) {
Log.e("surfaceDestroyed ", "Hilo detenido ");
}
#Override
public void onDraw(Canvas canvas) {
}
}
In conclussion, with surface.ini(); i call to SurfaceCreated and draw the room, and my idea is that with surface.upddate(); represents a point in this room. It is possible reuse same canvas and holder? how?
I read something about invalidate() function, could be help me? how use this function?
thanks

You'll need a thread to manage the view redrawing effect :
From run method either :
Code your drawing method
Call directly onDraw
Here is an example Example on how to subclass and use SurfaceView

Trying to get custom android camera working

I have developed a basic camera and am trying to get it working.
Here is the camera code
package com.example.camera;
import java.io.IOException;
import android.content.Context;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class CameraView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder holder;
private Camera camera;
Object size;
public CameraView(Context context) {
super(context);
holder = this.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
holder.addCallback(this);
}
public Camera getCamera(){
return camera;
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Camera.Parameters params = camera.getParameters();//Getting paramaters.
if(size!=null){ //make sure we don't pull a NullException.
params.setPreviewSize(width, height);//gotta set the size, since we know it.
}
camera.setParameters(params);//gotta set the paramaters now.
camera.startPreview();//starting the preview.
}
public void surfaceCreated(SurfaceHolder arg0) {
try{
camera = Camera.open();//setting the camera up.
camera.setPreviewDisplay(holder);//making the display our current SurfaceHolder
} catch (IOException e){
e.printStackTrace();//printing out the error message if it happens.
}
}
public void surfaceDestroyed(SurfaceHolder arg0) {
camera.stopPreview();
camera.release();
camera = null;
}
}
Now Im trying to call the camera from my main method and I just cant seem to make it work
package com.example.camera;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class main {
private static final int CAMERA_REQUEST = 1888;
private ImageView imageView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.imageView = (ImageView)this.findViewById(R.id.imageView1);
Button photoButton = (Button) this.findViewById(R.id.button1);
photoButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
cam = cv.getCamera(); //notice how we used that method? ;)
cam.takePicture(null,null,PictureCallback_);
}
});
}
Camera.PictureCallback PictureCallback_ = new Camera.PictureCallback() {
public void onPictureTaken(byte[] imageData, Camera c) {
InputStream is = new ByteArrayInputStream(imageData);
Bitmap bmp = BitmapFactory.decodeStream(is);
}
} ;
Any help is appreciated. Trying to call the original camera activity getCamera and then get the picture taken and put it into imageView1 any help is appreciated.

Try to do this in your onClick() method:
cam.autoFocus(new AutoFocusCallback(){
Camera.ShutterCallback shutterCallback = new Camera.ShutterCallback() {
public void onShutter() {
// If you want to play your own sound (otherwise, it plays the sound by default)
}
};
#Override
public void onAutoFocus(boolean arg0, Camera arg1) {
cam.takePicture(shutterCallback, null, PictureCallback_);
}
});

I have created a camera library project here you can use this library to call the camera and take pictures and save it or read code on how to use the camera. Sample is given you can check it out