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POColorPicker Dialog is not showing in android
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18074467
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18076121
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2013-08-06T07:47:49.363
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2013-09-05T18:43:48.467
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2013-08-06T13:35:56.487
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I have made a very simple drawing app in android ,in that i have used a colorpicker for choose different pencolor i have implemented as below,but on click of "color" button.my app is unfortunately stop(crash)..My code is as below,Please help me for my problem..Thank you in advance.. Main.java <pre><code>package com.example.singletouch; import android.os.Bundle; import android.app.ActionBar.LayoutParams; import android.app.Activity; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.view.View; import android.view.View.OnClickListener; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.TextView; public class MainActivity extends Activity implements ColorPickerDialog.OnColorChangedListener { ImageView pen, color; SingleTouchView mDrawView; RelativeLayout layout, layout1; ImageView remove; ImageView eraser; private LinearLayout list_color; LinearLayout pens; private TextView select_color; private int selectedColor = 0x00FF0000; HorizontalScrollView myplate; private Paint mPaint, mBitmapPaint; private Path mPath; public Canvas mCanvas; LinearLayout pen1, pen2, pen3, pen4; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mDrawView = (SingleTouchView) findViewById(R.id.myview); layout1 = (RelativeLayout) findViewById(R.id.layout1); layout = (RelativeLayout) findViewById(R.id.layout); pen = (ImageView) findViewById(R.id.pen); pens = (LinearLayout) findViewById(R.id.linear); pens.setVisibility(View.GONE); pen1 = (LinearLayout) findViewById(R.id.pen1); pen2 = (LinearLayout) findViewById(R.id.pen2); pen3 = (LinearLayout) findViewById(R.id.pen3); pen4 = (LinearLayout) findViewById(R.id.pen4); eraser = (ImageView) findViewById(R.id.eraser); remove = (ImageView) findViewById(R.id.remove); color = (ImageView) findViewById(R.id.color); pen.setOnClickListener(new OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub pens.setVisibility(View.VISIBLE); } }); pens.setVisibility(View.GONE); pen1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mDrawView.setPen(SingleTouchView.DrawingPens.PEN_1); pens.setVisibility(View.GONE); } }); pen2.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mDrawView.setPen(SingleTouchView.DrawingPens.PEN_2); pens.setVisibility(View.GONE); } }); pen3.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pens.setVisibility(View.GONE); mDrawView.setPen(SingleTouchView.DrawingPens.PEN_3); } }); pen4.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pens.setVisibility(View.GONE); mDrawView.setPen(SingleTouchView.DrawingPens.PEN_4); } }); remove.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { layout.removeView(mDrawView); mDrawView = new SingleTouchView(MainActivity.this); layout.addView(mDrawView); } }); eraser.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mBitmapPaint.setColor(Color.TRANSPARENT); mPath.reset(); mDrawView.invalidate(); } }); color.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub // myplate.setVisibility(View.VISIBLE); new ColorPickerDialog(MainActivity.this, MainActivity.this, mPaint.getColor()).show(); } }); } @Override public void colorChanged(int color) { // TODO Auto-generated method stub } } </code></pre> ColorPickerDialog.java <pre><code>package com.example.singletouch; import android.app.Dialog; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.ColorMatrix; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.Shader; import android.graphics.SweepGradient; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; public class ColorPickerDialog extends Dialog{ public interface OnColorChangedListener { void colorChanged(int color); } private OnColorChangedListener mListener; private int mInitialColor; private static class ColorPickerView extends View { private Paint mPaint; private Paint mCenterPaint; private final int[] mColors; private OnColorChangedListener mListener; ColorPickerView(Context c, OnColorChangedListener l, int color) { super(c); mListener = l; mColors = new int[] { 0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF, 0xFF00FF00, 0xFFFFFF00, 0xFFFF0000 }; Shader s = new SweepGradient(0, 0, mColors, null); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setShader(s); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(32); mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mCenterPaint.setColor(color); mCenterPaint.setStrokeWidth(5); } private boolean mTrackingCenter; private boolean mHighlightCenter; protected void onDraw(Canvas canvas) { float r = CENTER_X - mPaint.getStrokeWidth()*0.5f; canvas.translate(CENTER_X, CENTER_X); canvas.drawOval(new RectF(-r, -r, r, r), mPaint); canvas.drawCircle(0, 0, CENTER_RADIUS, mCenterPaint); if (mTrackingCenter) { int c = mCenterPaint.getColor(); mCenterPaint.setStyle(Paint.Style.STROKE); if (mHighlightCenter) { mCenterPaint.setAlpha(0xFF); } else { mCenterPaint.setAlpha(0x80); } canvas.drawCircle(0, 0, CENTER_RADIUS + mCenterPaint.getStrokeWidth(), mCenterPaint); mCenterPaint.setStyle(Paint.Style.FILL); mCenterPaint.setColor(c); } } protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(CENTER_X*2, CENTER_Y*2); } private static final int CENTER_X = 100; private static final int CENTER_Y = 100; private static final int CENTER_RADIUS = 32; private int floatToByte(float x) { int n = java.lang.Math.round(x); return n; } private int pinToByte(int n) { if (n < 0) { n = 0; } else if (n > 255) { n = 255; } return n; } private int ave(int s, int d, float p) { return s + java.lang.Math.round(p * (d - s)); } private int interpColor(int colors[], float unit) { if (unit <= 0) { return colors[0]; } if (unit >= 1) { return colors[colors.length - 1]; } float p = unit * (colors.length - 1); int i = (int)p; p -= i; // now p is just the fractional part [0...1) and i is the index int c0 = colors[i]; int c1 = colors[i+1]; int a = ave(Color.alpha(c0), Color.alpha(c1), p); int r = ave(Color.red(c0), Color.red(c1), p); int g = ave(Color.green(c0), Color.green(c1), p); int b = ave(Color.blue(c0), Color.blue(c1), p); return Color.argb(a, r, g, b); } private int rotateColor(int color, float rad) { float deg = rad * 180 / 3.1415927f; int r = Color.red(color); int g = Color.green(color); int b = Color.blue(color); ColorMatrix cm = new ColorMatrix(); ColorMatrix tmp = new ColorMatrix(); cm.setRGB2YUV(); tmp.setRotate(0, deg); cm.postConcat(tmp); tmp.setYUV2RGB(); cm.postConcat(tmp); final float[] a = cm.getArray(); int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b); int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b); int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b); return Color.argb(Color.alpha(color), pinToByte(ir), pinToByte(ig), pinToByte(ib)); } private static final float PI = 3.1415926f; @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX() - CENTER_X; float y = event.getY() - CENTER_Y; boolean inCenter = java.lang.Math.sqrt(x*x + y*y) <= CENTER_RADIUS; switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mTrackingCenter = inCenter; if (inCenter) { mHighlightCenter = true; invalidate(); break; } case MotionEvent.ACTION_MOVE: if (mTrackingCenter) { if (mHighlightCenter != inCenter) { mHighlightCenter = inCenter; invalidate(); } } else { float angle = (float)java.lang.Math.atan2(y, x); // need to turn angle [-PI ... PI] into unit [0....1] float unit = angle/(2*PI); if (unit < 0) { unit += 1; } mCenterPaint.setColor(interpColor(mColors, unit)); invalidate(); } break; case MotionEvent.ACTION_UP: if (mTrackingCenter) { if (inCenter) { mListener.colorChanged(mCenterPaint.getColor()); } mTrackingCenter = false; // so we draw w/o halo invalidate(); } break; } return true; } } public ColorPickerDialog(Context context, OnColorChangedListener listener, int initialColor) { super(context); mListener = listener; mInitialColor = initialColor; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); OnColorChangedListener l = new OnColorChangedListener() { public void colorChanged(int color) { mListener.colorChanged(color); dismiss(); } }; setContentView(new ColorPickerView(getContext(), l, mInitialColor)); setTitle("Pick a Color"); } } </code></pre> Logcat <pre><code>08-06 13:16:17.164: E/AndroidRuntime(2421): FATAL EXCEPTION: main 08-06 13:16:17.164: E/AndroidRuntime(2421): java.lang.NullPointerException 08-06 13:16:17.164: E/AndroidRuntime(2421): at com.example.singletouch.MainActivity$8.onClick(MainActivity.java:184) 08-06 13:16:17.164: E/AndroidRuntime(2421): at android.view.View.performClick(View.java:3511) 08-06 13:16:17.164: E/AndroidRuntime(2421): at android.view.View$PerformClick.run(View.java:14109) 08-06 13:16:17.164: E/AndroidRuntime(2421): at android.os.Handler.handleCallback(Handler.java:605) 08-06 13:16:17.164: E/AndroidRuntime(2421): at android.os.Handler.dispatchMessage(Handler.java:92) 08-06 13:16:17.164: E/AndroidRuntime(2421): at android.os.Looper.loop(Looper.java:137) 08-06 13:16:17.164: E/AndroidRuntime(2421): at android.app.ActivityThread.main(ActivityThread.java:4424) 08-06 13:16:17.164: E/AndroidRuntime(2421): at java.lang.reflect.Method.invokeNative(Native Method) 08-06 13:16:17.164: E/AndroidRuntime(2421): at java.lang.reflect.Method.invoke(Method.java:511) 08-06 13:16:17.164: E/AndroidRuntime(2421): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 08-06 13:16:17.164: E/AndroidRuntime(2421): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 08-06 13:16:17.164: E/AndroidRuntime(2421): at dalvik.system.NativeStart.main(Native Method) </code></pre> ... Please help me..!
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<android><android-canvas><color-picker>
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ColorPicker Dialog is not showing in android
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