使用RotateDrawable，Thread和 Handler實現儀表盤指針旋轉功能

1》RotateDrawable資源文件res/drawable/rotate_pointer.xml

<?xml version="1.0" encoding="utf-8"?> <rotate xmlns:android="http://schemas.android.com/apk/res/android"android:drawable="@drawable/img_pointer"android:fromDegrees="0"android:pivotX="50%"android:pivotY="50%"android:toDegrees="360"></rotate>

2》布局如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MainActivity"><ImageViewandroid:id="@+id/img_iv"android:layout_width="match_parent"android:layout_height="wrap_content"android:src="@drawable/rotate_pointer"android:background="@drawable/img_bg"/></RelativeLayout>
效果如下：

3》代碼如下：

package com.demo.cxc.drawabledemo;import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.widget.ImageView;public class MainActivity extends AppCompatActivity {private static final String TAG = "MainActivity";private static final String PROGRESS_KEY = "MainActivity.progress_key";private ImageView img_iv;private Handler myHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);TODO: 15/6/8//int progress = msg.getData().getInt(PROGRESS_KEY);Log.d(TAG, "****thread:" + Thread.currentThread().getId() + "----receive:" + progress);img_iv.setImageLevel((int) (progress * 10000.0 / 100));}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initViews();//啟到一個新線程new Thread(backgroundThreadRunnable).start();}private void initViews() {img_iv = (ImageView) findViewById(R.id.img_iv);}private Runnable backgroundThreadRunnable = new Runnable() {@Overridepublic void run() {for (int i = 1; i <= 100; i++) {Message msg = myHandler.obtainMessage();Bundle bundle = new Bundle();bundle.putInt(PROGRESS_KEY, i);//設置要傳遞的數據msg.setData(bundle);//發送數據msg.sendToTarget();Log.d(TAG, "----thread:" + Thread.currentThread().getId() + "----send:" + i);try {Thread.sleep(200);//休眠200ms} catch (InterruptedException e) {e.printStackTrace();}}}};}
這樣當程序運行時，中間的指針就可以根據后臺線程發送過來的數據來旋轉，以實現儀表盤的功能。

總結

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