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850天前ackage com.example.mofangweixin; |
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import android.content.Context; |
import android.content.res.TypedArray; |
import android.graphics.Bitmap; |
import android.graphics.Bitmap.Config; |
import android.graphics.Canvas; |
import android.graphics.Paint; |
import android.graphics.PorterDuff; |
import android.graphics.PorterDuffXfermode; |
import android.graphics.Rect; |
import android.graphics.drawable.BitmapDrawable; |
import android.os.Bundle; |
import android.os.Looper; |
import android.os.Parcelable; |
import android.util.AttributeSet; |
import android.util.TypedValue; |
import android.view.View; |
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public class ChangeColorIconWithText extends View { |
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private int mColor = 0xFF6495ED; |
private Bitmap mIconBitmap; |
private String mText = "微信"; |
private int mTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, |
getResources().getDisplayMetrics()); |
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private Canvas mCanvas; |
private Bitmap mBitmap; |
private Paint mPaint; |
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private float mAlpha; |
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private Rect mIconRect; |
private Rect mTextBound; |
private Paint mTextPaint; |
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public ChangeColorIconWithText(Context context) { |
this(context, null); |
} |
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public ChangeColorIconWithText(Context context, AttributeSet attrs) { |
this(context, attrs, 0); |
} |
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/** |
* 获取自定义属性的值 |
* |
* @param context |
* @param attrs |
* @param defStyleAttr |
*/ |
public ChangeColorIconWithText(Context context, AttributeSet attrs, int defStyleAttr) { |
super(context, attrs, defStyleAttr); |
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ChangeColorIconWithText); |
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int n = a.getIndexCount(); |
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for (int i = 0; i < n; i++) { |
int attr = a.getIndex(i); |
switch (attr) { |
case R.styleable.ChangeColorIconWithText_icon: |
BitmapDrawable drawable = (BitmapDrawable) a.getDrawable(attr); |
mIconBitmap = drawable.getBitmap(); |
break; |
case R.styleable.ChangeColorIconWithText_color: |
mColor = a.getColor(attr, 0xFF191970); |
break; |
case R.styleable.ChangeColorIconWithText_text: |
mText = a.getString(attr); |
break; |
case R.styleable.ChangeColorIconWithText_text_size: |
mTextSize = (int) a.getDimension(attr, |
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, getResources().getDisplayMetrics())); |
break; |
} |
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} |
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a.recycle(); |
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mTextBound = new Rect(); |
mTextPaint = new Paint(); |
mTextPaint.setTextSize(mTextSize); |
mTextPaint.setColor(0XFF6495ED); |
mTextPaint.getTextBounds(mText, 0, mText.length(), mTextBound); |
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} |
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@Override |
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
int iconWidth = Math.min(getMeasuredWidth() - getPaddingLeft() - getPaddingRight(), |
getMeasuredHeight() - getPaddingTop() - getPaddingBottom() - mTextBound.height()); |
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int left = getMeasuredWidth() / 2 - iconWidth / 2; |
int top = getMeasuredHeight() / 2 - (mTextBound.height() + iconWidth) / 2; |
mIconRect = new Rect(left, top, left + iconWidth, top + iconWidth); |
} |
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@Override |
protected void onDraw(Canvas canvas) { |
canvas.drawBitmap(mIconBitmap, null, mIconRect, null); |
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int alpha = (int) Math.ceil(255 * mAlpha); |
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// 内存去准备mBitmap , setAlpha , 纯色 ，xfermode ， 图标 |
setupTargetBitmap(alpha); |
// 1、绘制原文本 ； 2、绘制变色的文本 |
drawSourceText(canvas, alpha); |
drawTargetText(canvas, alpha); |
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canvas.drawBitmap(mBitmap, 0, 0, null); |
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} |
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/** |
* 绘制变色的文本 |
* |
* @param canvas |
* @param alpha |
*/ |
private void drawTargetText(Canvas canvas, int alpha) { |
mTextPaint.setColor(mColor); |
mTextPaint.setAlpha(alpha); |
int x = getMeasuredWidth() / 2 - mTextBound.width() / 2; |
int y = mIconRect.bottom + mTextBound.height(); |
canvas.drawText(mText, x, y, mTextPaint); |
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} |
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/** |
* 绘制原文本 |
* |
* @param canvas |
* @param alpha |
*/ |
private void drawSourceText(Canvas canvas, int alpha) { |
//底部字体的颜色 |
mTextPaint.setColor(0xFF696969); |
mTextPaint.setAlpha(255 - alpha); |
int x = getMeasuredWidth() / 2 - mTextBound.width() / 2; |
int y = mIconRect.bottom + mTextBound.height(); |
canvas.drawText(mText, x, y, mTextPaint); |
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} |
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/** |
* 在内存中绘制可变色的Icon |
*/ |
private void setupTargetBitmap(int alpha) { |
mBitmap = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(), Config.ARGB_8888); |
mCanvas = new Canvas(mBitmap); |
mPaint = new Paint(); |
mPaint.setColor(mColor); |
mPaint.setAntiAlias(true); |
mPaint.setDither(true); |
mPaint.setAlpha(alpha); |
mCanvas.drawRect(mIconRect, mPaint); |
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); |
mPaint.setAlpha(255); |
mCanvas.drawBitmap(mIconBitmap, null, mIconRect, mPaint); |
} |
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private static final String INSTANCE_STATUS = "instance_status"; |
private static final String STATUS_ALPHA = "status_alpha"; |
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@Override |
protected Parcelable onSaveInstanceState() { |
Bundle bundle = new Bundle(); |
bundle.putParcelable(INSTANCE_STATUS, super.onSaveInstanceState()); |
bundle.putFloat(STATUS_ALPHA, mAlpha); |
return bundle; |
} |
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@Override |
protected void onRestoreInstanceState(Parcelable state) { |
if (state instanceof Bundle) { |
Bundle bundle = (Bundle) state; |
mAlpha = bundle.getFloat(STATUS_ALPHA); |
super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATUS)); |
return; |
} |
super.onRestoreInstanceState(state); |
} |
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public void setIconAlpha(float alpha) { |
this.mAlpha = alpha; |
invalidateView(); |
} |
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/** |
* 重绘 |
*/ |
private void invalidateView() { |
if (Looper.getMainLooper() == Looper.myLooper()) { |
invalidate(); |
} else { |
postInvalidate(); |
} |
} |
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} |
