android启动界面

启动界面的效果图：

实现的原理：在一个线程中让几幅图片进行循环显示，实现了动画的效果。
基本的实现类LoadingView是自己定义控件，继承了ImageView，实现了Runnable接口 ：

package wht.android.loading;


import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.widget.ImageView;

public class LoadingView extends ImageView implements Runnable
{
        private boolean isStop = false;
        
        private int[] imageIds;
        private int index = 0;
        private int length = 1;
        
        public LoadingView(Context context)
        {
                this(context, null);
        }

        public LoadingView(Context context, AttributeSet attrs)
        {
                super(context, attrs);
        }
        
        public void setImageIds(int[] imageId)
        {
                this.imageIds = imageId;
                if(imageIds != null && imageIds.length > 0)
                {
                        length = imageIds.length;
                }
        }
        
                @Override
        protected void onDetachedFromWindow()
        {
                // TODO Auto-generated method stub
                super.onDetachedFromWindow();
                isStop = true;
        }

        @Override
        protected void onDraw(Canvas canvas)
        {
                // TODO Auto-generated method stub
                super.onDraw(canvas);
                if(imageIds != null && imageIds.length > 0)
                {
                        this.setImageResource(imageIds[index]);
                }
        }

        @Override
        public void run()
        {
                while(!isStop)
                {
                        //计算要显示图片的位置
                        index = ++index % length;
                        postInvalidate();
                        try
                        {
                                Thread.sleep(400);
                        }
                        catch (InterruptedException e)
                        {
                                e.printStackTrace();
                        }
                }
        }
        
      //启动图片轮换线程
        public void startAnim()
        {
                new Thread(this).start();
        }

}

MainActivity:其中的LoadingView 就是我们自己定义的控件。在布局中使用时跟其它控件一样。

package wht.android.loading;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {
	private LoadingView main_imageview;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		main_imageview = (LoadingView) findViewById(R.id.main_imageview);
		initLoadingImages();

		new Thread() {
			@Override
			public void run() {
				main_imageview.startAnim();
			}
		}.start();
	}
	private void initLoadingImages() {
		int[] imageIds = new int[6];
		imageIds[0] = R.drawable.loader_frame_1;
		imageIds[1] = R.drawable.loader_frame_2;
		imageIds[2] = R.drawable.loader_frame_3;
		imageIds[3] = R.drawable.loader_frame_4;
		imageIds[4] = R.drawable.loader_frame_5;
		imageIds[5] = R.drawable.loader_frame_6;

		main_imageview.setImageIds(imageIds);
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

布局文件main.xml 其中使用的wht.android.loading.LoadingView就是前面定义的控件，完整的包名加上类名。

<?xml version="1.0" encoding="utf-8"?
>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#e1e1e1"
    android:gravity="center"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="65dip"
        android:orientation="vertical" >

        <wht.android.loading.LoadingView
            android:id="@+id/main_imageview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            
            android:src="@drawable/loader_frame_1" >
        </wht.android.loading.LoadingView>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="10dip"
            android:text="启动中..."
            android:textColor="#666666"
            android:textSize="20sp" />
    </LinearLayout>

</LinearLayout>

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