Android：如何动态地或通过OVERLAYING按钮来创建一个超过位图的按钮？
我正试图在视图上通过位图或覆盖按钮创建一个按钮。 我在这里创建数字签名。 签名后我需要保存，因为我需要一个按钮。 请任何人帮助我。 它非常紧急。 谢谢
在这里我的代码
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);
}
}
我能够创建图像和无法启动的活动。 请让我知道如何解决这个问题。
在这里，我得到了在BITMAP＆CANVAS上动态创建按钮的方法
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();
}
}
});
}
}
谢谢你们帮助..
如果将ImageView和Button放置在RelativeLayout它们将相互重叠。 你可以根据需要玩定位。
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<ImageView
android:....
android:....
/>
<Button
android:....
android:....
/>
</RelativeLayout>
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