android 阅读器

【实例截图】

【核心代码】

package yuku.ambilwarna;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import android.widget.RelativeLayout;

import com.yamin.reader.R;

public class AmbilWarnaDialog {
public interface OnAmbilWarnaListener {
void onCancel(AmbilWarnaDialog dialog);
void onOk(AmbilWarnaDialog dialog, int color);
}

final AlertDialog dialog;
final OnAmbilWarnaListener listener;
final View viewHue;
final AmbilWarnaKotak viewSatVal;
final ImageView viewCursor;
final View viewOldColor;
final View viewNewColor;
final ImageView viewTarget;
final ViewGroup viewContainer;
final float[] currentColorHsv = new float[3];

/**
* create an AmbilWarnaDialog. call this only from OnCreateDialog() or from a background thread.
* 
* @param context
*            current context
* @param color
*            current color
* @param listener
*            an OnAmbilWarnaListener, allowing you to get back error or
*/
public AmbilWarnaDialog(final Context context, int color, OnAmbilWarnaListener listener) {
this.listener = listener;
Color.colorToHSV(color, currentColorHsv);

final View view = LayoutInflater.from(context).inflate(R.layout.ambilwarna_dialog, null);
viewHue = view.findViewById(R.id.ambilwarna_viewHue);
viewSatVal = (AmbilWarnaKotak) view.findViewById(R.id.ambilwarna_viewSatBri);
viewCursor = (ImageView) view.findViewById(R.id.ambilwarna_cursor);
viewOldColor = view.findViewById(R.id.ambilwarna_warnaLama);
viewNewColor = view.findViewById(R.id.ambilwarna_warnaBaru);
viewTarget = (ImageView) view.findViewById(R.id.ambilwarna_target);
viewContainer = (ViewGroup) view.findViewById(R.id.ambilwarna_viewContainer);

viewSatVal.setHue(getHue());
viewOldColor.setBackgroundColor(color);
viewNewColor.setBackgroundColor(color);

viewHue.setOnTouchListener(new View.OnTouchListener() {
@Override public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE
|| event.getAction() == MotionEvent.ACTION_DOWN
|| event.getAction() == MotionEvent.ACTION_UP) {

float y = event.getY();
if (y < 0.f) y = 0.f;
if (y > viewHue.getMeasuredHeight()) y = viewHue.getMeasuredHeight() - 0.001f; // to avoid looping from end to start.
float hue = 360.f - 360.f / viewHue.getMeasuredHeight() * y;
if (hue == 360.f) hue = 0.f;
setHue(hue);

// update view
viewSatVal.setHue(getHue());
moveCursor();
viewNewColor.setBackgroundColor(getColor());

return true;
}
return false;
}
});
viewSatVal.setOnTouchListener(new View.OnTouchListener() {
@Override public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE
|| event.getAction() == MotionEvent.ACTION_DOWN
|| event.getAction() == MotionEvent.ACTION_UP) {

float x = event.getX(); // touch event are in dp units.
float y = event.getY();

if (x < 0.f) x = 0.f;
if (x > viewSatVal.getMeasuredWidth()) x = viewSatVal.getMeasuredWidth();
if (y < 0.f) y = 0.f;
if (y > viewSatVal.getMeasuredHeight()) y = viewSatVal.getMeasuredHeight();

setSat(1.f / viewSatVal.getMeasuredWidth() * x);
setVal(1.f - (1.f / viewSatVal.getMeasuredHeight() * y));

// update view
moveTarget();
viewNewColor.setBackgroundColor(getColor());

return true;
}
return false;
}
});

dialog = new AlertDialog.Builder(context)
.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
if (AmbilWarnaDialog.this.listener != null) {
AmbilWarnaDialog.this.listener.onOk(AmbilWarnaDialog.this, getColor());
}
}
})
.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
if (AmbilWarnaDialog.this.listener != null) {
AmbilWarnaDialog.this.listener.onCancel(AmbilWarnaDialog.this);
}
}
})
.setOnCancelListener(new OnCancelListener() {
// if back button is used, call back our listener.
@Override public void onCancel(DialogInterface paramDialogInterface) {
if (AmbilWarnaDialog.this.listener != null) {
AmbilWarnaDialog.this.listener.onCancel(AmbilWarnaDialog.this);
}

}
})
.create();
// kill all padding from the dialog window
dialog.setView(view, 0, 0, 0, 0);

// move cursor & target on first draw
ViewTreeObserver vto = view.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override public void onGlobalLayout() {
moveCursor();
moveTarget();
view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
}
});
}

protected void moveCursor() {
float y = viewHue.getMeasuredHeight() - (getHue() * viewHue.getMeasuredHeight() / 360.f);
if (y == viewHue.getMeasuredHeight()) y = 0.f;
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) viewCursor.getLayoutParams();
layoutParams.leftMargin = (int) (viewHue.getLeft() - Math.floor(viewCursor.getMeasuredWidth() / 2) - viewContainer.getPaddingLeft());
;
layoutParams.topMargin = (int) (viewHue.getTop() y - Math.floor(viewCursor.getMeasuredHeight() / 2) - viewContainer.getPaddingTop());
;
viewCursor.setLayoutParams(layoutParams);
}

protected void moveTarget() {
float x = getSat() * viewSatVal.getMeasuredWidth();
float y = (1.f - getVal()) * viewSatVal.getMeasuredHeight();
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) viewTarget.getLayoutParams();
layoutParams.leftMargin = (int) (viewSatVal.getLeft() x - Math.floor(viewTarget.getMeasuredWidth() / 2) - viewContainer.getPaddingLeft());
layoutParams.topMargin = (int) (viewSatVal.getTop() y - Math.floor(viewTarget.getMeasuredHeight() / 2) - viewContainer.getPaddingTop());
viewTarget.setLayoutParams(layoutParams);
}

private int getColor() {
return Color.HSVToColor(currentColorHsv);
}

private float getHue() {
return currentColorHsv[0];
}

private float getSat() {
return currentColorHsv[1];
}

private float getVal() {
return currentColorHsv[2];
}

private void setHue(float hue) {
currentColorHsv[0] = hue;
}

private void setSat(float sat) {
currentColorHsv[1] = sat;
}

private void setVal(float val) {
currentColorHsv[2] = val;
}

public void show() {
dialog.show();
}

public AlertDialog getDialog() {
return dialog;
}
}