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android中實現(xiàn)指針滑動的動態(tài)效果方法

 更新時間：2013年03月15日 10:27:12   作者：  
本次實現(xiàn)的是類似于墨跡天氣中軌跡圖片上指針隨著數(shù)值滾動滑動的效果，基本思路是開啟線程，控制指針所在的imageview控件的padding屬性。

復(fù)制代碼 代碼如下:

<FrameLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="#fff"
            android:paddingBottom="5dp"
            android:paddingLeft="5dp"
            android:paddingRight="2dp"
            >

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="right"
                android:src="@drawable/up_icon"
                android:layout_marginTop="0dp"
                android:paddingTop="0dp" />

            <LinearLayout
                android:layout_width="240dip"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="7dp"
                android:orientation="horizontal" >

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="left"
                    android:text="優(yōu)"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="left"
                    android:text="良"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="left"
                    android:text="中等"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="left"
                    android:text="不健康"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="left"
                    android:text="有毒害"
                    android:textSize="12sp" />
            </LinearLayout>

           
            <LinearLayout
                android:layout_width="240dip"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="7dp"
                android:layout_marginTop="40dp"
                android:orientation="horizontal" >

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center_horizontal"
                    android:text="80"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center_horizontal"
                    android:text="120"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center_horizontal"
                    android:text="160"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center_horizontal"
                    android:text="200"
                    android:textSize="12sp" />

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:gravity="center_horizontal"
                    android:text="400"
                    android:textSize="12sp" />
            </LinearLayout>

            <ImageView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:layout_marginTop="10dp"
                android:src="@drawable/zhizhen"
                android:id="@+id/zhizhen"/>

            <ImageView
                android:id="@+id/dengji_img"
                android:layout_width="250dip"
                android:layout_height="wrap_content"
                android:layout_marginTop="25dp"
                android:src="@drawable/dengji_icon" />
        </FrameLayout>

上面這段代碼實現(xiàn)的布局為

首先，因為指針有壓著下面的滾動條，因此這是一個framelayout的布局。其次，要實現(xiàn)指針的勻速滾動，需要開啟一個線程，在線程中能夠?qū)崿F(xiàn)利用循環(huán)，以及線程的休眠，通過控制指針所在圖標的padding屬性來實現(xiàn)滾動的動畫效果

復(fù)制代碼 代碼如下:

Handler myHandler =new Handler(){

        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            super.handleMessage(msg);
            //對于c的更改和循環(huán)應(yīng)該是在線程中跑，要不run僅僅執(zhí)行一次，           
            zhizhen.setPadding(c, 0, 0, 0);
        }

       
    };
    class MyThread extends Thread{

        @Override
        public void run() {
            //發(fā)送一個消息，通知主線程改變UI
         try {

             while(c<=input){
                 c=c+1;
                 this.sleep(10);
                 myHandler.sendEmptyMessage(0);                
             }

               
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

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