Android: cách tạo nút trên Bitmap động hoặc nút OVERLAYING?

Question

Tôi đang cố gắng tạo nút BUTTON trên BITMAP hoặc OVERLAYING trên chế độ xem. Tôi đang tạo chữ ký số ở đây. sau khi chữ ký tôi cần phải lưu cho rằng tôi cần một nút. xin vui lòng bất cứ ai giúp tôi ra ngoài. Rất khẩn cấp. Cảm ơn bạn

Ở đây mã của tôi

import android.content.Context; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.Bitmap.Config; 
import android.graphics.BitmapFactory; 
import android.graphics.BlurMaskFilter; 
import android.graphics.BlurMaskFilter.Blur; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Path; 
import android.graphics.PorterDuff.Mode; 
import android.graphics.PorterDuffXfermode; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.MenuItem; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup.LayoutParams; 
import android.widget.Button; 
import android.widget.TextView; 

public class FingerPaint extends GraphicsActivity 
    implements OnClickListener { 
private TextView pauseButton; 

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(new MyView(this)); 

    Capture_SignatureActivity.writeLog("In FingerPaint class"); 
    mPaint = new Paint(); 
    mPaint.setAntiAlias(true); 
    mPaint.setDither(true); 
    mPaint.setColor(0xFF003F87); 
    mPaint.setStyle(Paint.Style.STROKE); 
    mPaint.setStrokeJoin(Paint.Join.ROUND); 
    mPaint.setStrokeCap(Paint.Cap.ROUND); 
    mPaint.setStrokeWidth(1); 

} 
private Paint mPaint; 

public void colorChanged(int color) { 
    Capture_SignatureActivity.writeLog("In color changed"); 
    mPaint.setColor(color); 
} 

public class MyView extends View{ 
    private static final float MINP = 0.25f; 
    private static final float MAXP = 0.75f; 

    private Bitmap mBitmap; 
    private Canvas mCanvas; 
    private Path mPath; 
    private Paint mBitmapPaint; 
    private Bitmap overlayDefault; 
    private Bitmap overlay; 
    private Canvas c2; 
    private Paint pTouch; 
    private float X = -100; 
    private float Y = -100; 



    public MyView(Context c) { 
     super(c); 
     Capture_SignatureActivity.writeLog("In MyVIEW"); 
     mPath = new Path(); 
     mBitmapPaint = new Paint(Paint.DITHER_FLAG); 


     mBitmap =  BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher); 
     overlayDefault = BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher); 
     overlay = BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher).copy(Config.ARGB_8888, true); 
     c2 = new Canvas(overlay);   



     pTouch = new Paint(Paint.ANTI_ALIAS_FLAG);   
     pTouch.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT)); 
     pTouch.setColor(Color.TRANSPARENT); 
     pTouch.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL)); 
     pTouch.setMaskFilter(startActivity(FingerPaint.this, Capture_SignatureActivity.class)); 



    } 

    @Override 
    protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
     super.onSizeChanged(w, h, oldw, oldh); 
     System.out.println("w-->"+w+"-->"+"h--"+h+"-->"+"oldw-->"+oldh+"oldw-->"+oldw); 
     Capture_SignatureActivity.writeLog("In onSizeChanged"); 
     mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);    
     mCanvas = new Canvas(mBitmap);  
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     Capture_SignatureActivity.writeLog("In onDraw"); 
     canvas.drawColor(0xFFFFFFFF);  

     canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); 
     canvas.drawPath(mPath, mPaint); 

     c2.drawBitmap(overlayDefault, 0, 0, null); //exclude this line to show all as you draw 
     c2.drawCircle(X , Y , 80, pTouch); 
     //draw the overlay over the background 
     canvas.drawBitmap(overlay, 0, 0, null); 

    } 

    private float mX, mY; 
    private static final float TOUCH_TOLERANCE = 4; 

    private void touch_start(float x, float y) { 
     Capture_SignatureActivity.writeLog("In touch_start"); 
     mPath.reset(); 
     mPath.moveTo(x, y); 
     mX = x; 
     mY = y; 
     System.out.println("---- " +mX); 
    } 
    private void touch_move(float x, float y) { 
     Capture_SignatureActivity.writeLog("In touch_Move"); 
     float dx = Math.abs(x - mX); 
     float dy = Math.abs(y - mY); 
     if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { 
      mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); 
      mX = x; 
      mY = y; 
     } 
    } 
    private void touch_up() { 
     Capture_SignatureActivity.writeLog("In touch_up"); 
     mPath.lineTo(mX, mY); 
     // commit the path to our offscreen 
     mCanvas.drawPath(mPath, mPaint); 
     // kill this so we don't double draw 
     mPath.reset(); 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
     Capture_SignatureActivity.writeLog("In touch_event"); 
     float x = event.getX(); 
     float y = event.getY(); 

     switch (event.getAction()) { 
     case MotionEvent.ACTION_DOWN: 
      touch_start(x, y); 
      invalidate(); 
      break; 
     case MotionEvent.ACTION_MOVE: 
      touch_move(x, y); 
      invalidate(); 
      break; 
     case MotionEvent.ACTION_UP: 
      touch_up(); 
      invalidate(); 
      break; 

     } 
     return true; 
    } 

    public void onClick(View v) { 
     //In myView 

     startActivity(new Intent(FingerPaint.this, Capture_SignatureActivity.class)); 


    } 
} 

public void onClick(View v) { 
    //onCreate 

} 

@Override 
public boolean onCreateOptionsMenu(android.view.Menu menu) 
{ 
    super.onCreateOptionsMenu(menu); 

    menu.add(0, 1, 0 , "Clear Screen"); 
    menu.add(0, 2, 0 , "Exit Screen"); 

    return true; 
} 

@Override 
public boolean onMenuItemSelected(int featureId, MenuItem item) 
{ 
    switch(item.getItemId()) 
    { 
    case 1: 
     startActivity(new Intent(this, FingerPaint.class)); 
     break; 
    case 2: 
     startActivity(new Intent(this, Capture_SignatureActivity.class)); 
     break; 

    } 
    return super.onMenuItemSelected(featureId, item); 
} 


} 

tôi có thể tạo ra hình ảnh & không thể bắt đầu hoạt động. Vui lòng cho tôi biết cách giải quyết vấn đề này.

Answer 1

Ở đây tôi có cách để tạo động nút trên BITMAP & CANVAS

public class MainAct extends GrapActivity implements OnClickListener { 


private Button saveButton; 
private Button clearButton; 

// onCreate Activity 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState);   

    // content view 
    signature = new MyView(this); 

    // Dynamically created button on bitmap & canvas 

    RelativeLayout myLayout = new RelativeLayout(this);   
    myLayout.setLayoutParams(new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

    // For Save Button 
    saveButton = new Button(this); 
    saveButton.setText("Save"); 
    saveButton.setOnClickListener(this); 

    // For Clear Button 
    clearButton = new Button(this); 
    clearButton.setText("Clear"); 
    clearButton.setOnClickListener(this); 

    myLayout.addView(signature); 
    myLayout.addView(saveButton); 
    myLayout.addView(clearButton); 

    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(100, LayoutParams.WRAP_CONTENT); 
    //Alignments 
    params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); 
    params.addRule(RelativeLayout.ALIGN_PARENT_LEFT); 
    saveButton.setLayoutParams(params); 

    //Alignments 
    RelativeLayout.LayoutParams params2 = new RelativeLayout.LayoutParams(100, LayoutParams.WRAP_CONTENT); 
    params2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
    params2.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); 
    clearButton.setLayoutParams(params2); 

    saveButton.bringToFront(); 
    clearButton.bringToFront(); 
    this.setContentView(myLayout); 
    new Thread(new RefreshRunner()).start(); 

    // onclick listner for CLEAR button 
    clearButton.setOnClickListener(new OnClickListener() {   
     public void onClick(View v) { 
      //Activity for Clearing the Screen 
      startActivity(new Intent(ThisAct.this, ThisAct.class)); 
      finish(); 
     } 
    }); 

// onclick listner for SAVE button 
     saveButton.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) { 
       //capture the image 
       try {      
        saveAsJpg(mBitmap);  
        startActivity(new Intent(ThisAct.this, MainActivity.class)); 
        finish(); 
       } catch (IOException e) {     
        e.printStackTrace(); 
       } 
      } 
     });  
} 

} 

Thanks guys giúp ..

Answer 2

nếu bạn đặt ImageView và Button bên trong một RelativeLayout chúng sẽ chồng lên nhau. Bạn có thể chơi với vị trí khi cần thiết.

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

<ImageView 
android:.... 
android:.... 
/> 
<Button 
android:.... 
android:.... 
/> 
</RelativeLayout>