android动画之通过子线程来实现动画

使用android动画机制，往往是相对于原始位置来进行参照。

这里通过子线程修改物体位置实现动画。

布局文件：

<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"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/show"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="40dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:onClick="MyCLick"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:text="行动" />

    <Button
        android:id="@+id/button2"
        android:onClick="MyCLick"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginRight="28dp"
        android:layout_toLeftOf="@+id/button1"
        android:text="获取位置" />

</RelativeLayout>

动画代码：

public class MainActivity extends Activity {

	TextView textView;
	MyRuns myRuns;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		textView = (TextView) findViewById(R.id.show);

		myRuns=new MyRuns(new MyHead(textView, 4, 8), true);//位移动画
	}

	static class MyHead extends Handler {// 坐标动画

		View view;// 操作元素
		float cx;
		float cy;

		public MyHead(View view, float cx, float cy) {
			super();
			this.view = view;
			this.cx = cx;
			this.cy = cy;
		}

		@Override
		public void handleMessage(Message msg) {
			// 更新ui
			view.setX(view.getX() + cx);
			view.setY(view.getY() + cy);
			super.handleMessage(msg);
		}

	}

	// 子线程更新位置
	class MyRuns implements Runnable {//更新UI界面

		MyHead head;
		boolean isFire = false;

		public MyRuns(MyHead head, boolean isFire) {
			super();
			this.head = head;
			this.isFire = isFire;
		}

		public boolean isFire() {
			return isFire;
		}

		public void setFire(boolean isFire) {
			this.isFire = isFire;
		}

		@Override
		public void run() {
			// TODO Auto-generated method stub
			try {
				while (true) {
					if (!isFire) {
						break;//停止动画
					}
					Thread.sleep(80);
					Message message = new Message();
					message.what = 3;
					message.obj = "";
					head.sendMessage(message);
				}
			} catch (Exception e) {
				// TODO: handle exception
			}
		}

	}

	//开始运动
	void StartThreed(MyRuns myRuns){
		myRuns.setFire(true);//开启
		new Thread(myRuns).start();
	}

	public void MyCLick(View view) {
		if (view.getId() == R.id.button1) {
			StartThreed(myRuns);
		} else if (view.getId() == R.id.button2) {
			myRuns.setFire(false);//结束子线程
			Toast.makeText(getApplicationContext(),
					"坐标" + textView.getX() + "||" + textView.getY(),
					Toast.LENGTH_SHORT).show();
		}

	}

}

原文地址：http://sijienet.com/bbs/?leibie=showinfo&id=57