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	<title>深蓝的blog &#187; Matrix</title>
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	<description>记录日常生活</description>
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		<title>android开发:触摸屏触摸事件MotionEvent演示实例</title>
		<link>http://www.lanxinbase.com/?p=1230</link>
		<comments>http://www.lanxinbase.com/?p=1230#comments</comments>
		<pubDate>Sun, 17 Jul 2016 01:51:50 +0000</pubDate>
		<dc:creator><![CDATA[Alan]]></dc:creator>
				<category><![CDATA[7.android应用开发]]></category>
		<category><![CDATA[Matrix]]></category>
		<category><![CDATA[MotionEvent]]></category>
		<category><![CDATA[onTouch]]></category>
		<category><![CDATA[onTouchEvent]]></category>
		<category><![CDATA[ScaleGestureDetector]]></category>

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		<description><![CDATA[mScaleGesture = new ScaleGestureDetector(this, new ScaleGestureDetector.OnScaleGestureListener() {
            @Override
            public boolean onScale(ScaleGestureDetector detector) {

                mScaleFloat *= detector.getScaleFactor();

                String str = "";

                str = "比例:"+detector.getScaleFactor()+" mScaleFloat:"+mScaleFloat+"\n";

                mScaleFloat = Math.max(0.1f,Math.min(mScaleFloat,5.0f));//图像比例,最小0.1,最大5

                str += "  mScaleFloat:"+mScaleFloat;
                text2.setText(str);

                matrix.setScale(mScaleFloat, mScaleFloat);
                img.setImageMatrix(matrix);
                img.invalidate();

                return true;//这里一定要返回真,否则不会继续监听事件
            }]]></description>
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