Android碎纸机效果

1.总体思想

活用padding和margin

2.实现过程

 public class PopupShredderView extends FrameLayout{

     public PopupShredderView(Context context, AttributeSet attrs, int defStyle) {

         super(context, attrs, defStyle);

         init();

     }

     public PopupShredderView(Context context, AttributeSet attrs) {

         super(context, attrs);

     init() ;

     }

     public PopupShredderView(Context context) {

         super(context);

     init();

     }

     private void init(){

       final LayoutInflater layoutInflater = LayoutInflater.from(context);

       mView = layoutInflater.inflate(R.layout.popup_shredder_clean, this, false);

       mCleanText1.setImageDrawable(themeManager.getDrawable(R.drawable.exit_clean_date));

       mCleanText2.setBackgroundDrawable(themeManager.getDrawable(R.drawable.exit_clean_result));

       mCleanText2.setVisibility(View.INVISIBLE);

     }

     public void update(int step, int offset){

             if (step == STEP_END) {

                    return;

                }

         int clean1Offset = mCleanText1.getMeasuredHeight() * step / STEP_END;

         int maxClean1Offset=mCleanText1.getMeasuredHeight();

         if (offset + clean1Offset < maxClean1Offset) {

             clean1Offset = clean1Offset + offset;

         } else {

             clean1Offset = maxClean1Offset;

         }

         mCleanText1.setPadding(0, clean1Offset, 0, 0);

         mCleanText2.setVisibility(View.VISIBLE);

         int clean2Offset = ((View) mCleanText2.getParent()).getMeasuredHeight() * (STEP_END - step)

                 / STEP_END;

         int maxClean2Offset= 0;

         if (clean2Offset - offset > maxClean2Offset) {

             clean2Offset = clean2Offset - offset;

         } else {

             clean2Offset = maxClean2Offset;

         }

         LinearLayout.LayoutParams layoutParams = (android.widget.LinearLayout.LayoutParams) mCleanText2

                 .getLayoutParams();

         layoutParams.bottomMargin = clean2Offset;

         mCleanText2.setLayoutParams(layoutParams);

         invalidate();

     }

 }

3.布局文件

 <?xml version="1.0" encoding="utf-8"?>

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:id="@+id/menubar"

     android:layout_width="192dp"

     android:layout_height="wrap_content"

     android:layout_gravity="center"

     android:orientation="vertical" >

     <ImageView

         android:id="@+id/exit_clean1"

         android:layout_width="wrap_content"

         android:layout_height="@dimen/popup_shredder_top_heigh"

         android:layout_gravity="center_horizontal"

         android:layout_marginLeft="21dp"

         android:contentDescription="@string/app_name"

         android:scaleType="matrix" />

     <LinearLayout

         android:layout_width="wrap_content"

         android:layout_height="@dimen/popup_shredder_top_heigh"

         android:layout_marginLeft="28dp"

         android:layout_marginTop="@dimen/popup_shredder_bottom_top_margin"

         android:orientation="vertical" >

         <ImageView

             android:id="@+id/exit_clean2"

             android:layout_width="wrap_content"

             android:layout_height="match_parent"

             android:layout_gravity="center_horizontal"

             android:contentDescription="@string/app_name" />

     </LinearLayout>

     <ImageView

         android:id="@+id/exit_clean3"

         android:layout_width="wrap_content"

         android:layout_height="@dimen/popup_shredder_delete_heigh"

         android:layout_gravity="center_horizontal"

         android:layout_marginTop="@dimen/popup_shredder_delete_top_margin"

         android:contentDescription="@string/app_name" />

 </RelativeLayout>

巴特西

Android碎纸机效果

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