1.通过使用handler 和 runnable 实现动态程序启动界面

这个程序本来是看看 别人写的，后来发现他实现的太麻烦了，先晒出他写的：（这里没有批评任何人的意思，仅仅作为交流）

效果如下



第一个辅助类：

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)

{

index = ++index % length;

postInvalidate();

try

{

Thread.sleep(400);

}

catch (InterruptedException e)

{

e.printStackTrace();

}

}

}

public void startAnim()

{

new Thread(this).start();

}

}

第二个类：

package wht.android.loading;

import android.app.Activity;

import android.os.Bundle;

public class MainActivity extends Activity

{

private LoadingView main_imageview;

@Override

public 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);

}

}

后来我想通过handler和runnable 来实现，效果一样，而且简单很多，和大家分享一下：

晒一下我写的：

package com.wj.main;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.widget.ImageView;

public class EnterUIActivity extends Activity {

private ImageView image;

private int[] images = new int[]{

R.drawable.loader_frame_1,

R.drawable.loader_frame_2,

R.drawable.loader_frame_3,

R.drawable.loader_frame_4,

R.drawable.loader_frame_5,

R.drawable.loader_frame_6,};

/** Called when the activity is first created. */

private Handler handler = new Handler();

private static int num = 0;

Runnable runnable = new Runnable() {

@Override

public void run() {

image.setBackgroundResource(images[num++]);

if (num%6==0) {

num = 0;

}

handler.postDelayed(runnable, 700);

}

};

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

init();

}

private void init(){

image = (ImageView)this.findViewById(R.id.imageView1);

handler.post(runnable);

}

@Override

protected void onDestroy() {

handler.removeCallbacks(runnable);

super.onDestroy();

}

}

布局文件很简单：

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

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

android:id="@+id/relativeLayout1"

android:layout_width="fill_parent"

android:layout_height="fill_parent" >

<ImageView

android:id="@+id/imageView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="179dp"/>

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/imageView1"

android:layout_centerHorizontal="true"

android:text="启动中......."

android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>