介绍 & lt; FrameLayout xmlns: Android=? http://schemas.android.com/apk/res/android",,
xmlns:才能工具=?http://schemas.android.com/tools",,
android:才能layout_width=癿atch_parent",
android:才能layout_height=癿atch_parent",在,
,
& lt;才能ImageView
,,,android: id=癅 + id/after",
,,,android: layout_width=皐rap_content",
,,,android: layout_height=皐rap_content",
,,,android: src=https://www.yisu.com/zixun/" @drawable/"/>
public class MainActivity extends Activity implements OnTouchListener {,
,
private 才能;ImageView imgafter;,
private 才能;ImageView imgbefore;,
private 才能Canvas 画布,
private 才能Paint 油漆,
private 才能Bitmap 位图,
private 才能Bitmap 之前,
private 才能Bitmap 之后,
,
@Override 才能;
protected 才能;void onCreate (Bundle savedInstanceState), {,
,,,super.onCreate (savedInstanceState);,
,,,setContentView (R.layout.activity_main);,
,
,,,imgafter =, (ImageView), findViewById (R.id.after);,
,,,imgbefore =, (ImageView), findViewById (R.id.before);,
,
,,,//,获得图片,
,,,after =, BitmapFactory.decodeResource (getresource (),, R.drawable.a),,
,,,before =, BitmapFactory.decodeResource (getresource (),, R.drawable.b),,
,
,,,imgafter.setImageBitmap(后),,
,,,imgbefore.setImageBitmap(之前),,
,,,//,创建可以修改的空白的bitmap
,,,bitmap =, Bitmap.createBitmap (before.getWidth (),, before.getHeight (),,
,,,,,,,before.getConfig ()),,
,,,imgbefore.setOnTouchListener(这个),,
,,,paint =, new 油漆();,
,,,paint.setStrokeWidth (5),,
,,,paint.setColor (Color.BLACK);,
,,,//,创建画布,
,,,canvas =, new 画布(位图),,
,,,canvas.drawBitmap(之前,new 矩阵(),油漆),,
,,},
,
@Override 才能;
public 才能;boolean ondraw (View arg0, MotionEvent 事件),{,
,,,switch (event.getAction ()), {,
,,,case MotionEvent.ACTION_MOVE:,
,,,,,int newX =, (int), event.getX (),,
,,,,,int newY =, (int), event.getY (),,
,,,,,//,将滑过的地方变为透明,
,,,,,for (int 小姐:=,-10;,小姐:& lt;, 10;,我+ +),{,
,,,,,,,for (int j =, -10;, j & lt;, 10;, j + +), {,
,,,,,,,,,if ((小姐:+,newX),祝辞=,before.getWidth (),
,,,,,,,,,,,,,| |,j +, newY 祝辞=,before.getHeight(), | |,小姐:+,newX & lt;, 0,
,,,,,,,,,,,,,| |,j +, newY & lt;, 0), {,
,,,,,,,,,,,return 假的,,
,,,,,,,,,},
,,,,,,,,,bitmap.setPixel(小姐:+,newX,, j +, newY,, Color.TRANSPARENT),,
,,,,,,,},
,,,,,},
,,,,,imgbefore.setImageBitmap(位图),,
,,,,,休息,,
,,,},
,,,return ,真的,,
,,},
null
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<强>布局文件
活动代码
