package wht.android.loading;
import android.app.Activity;
import android.graphics.drawable.AnimationDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends Activity{
public AnimationDrawable frameAnimation;
public TextView tv;
public ImageView iv;
public boolean flag = false;
public Handler handler = new Handler(){
public void handleMessage(Message msg){
StopAnimation();
}
};
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.donghua);
iv = (ImageView) findViewById(R.id.imgeView);
iv.setBackgroundResource(R.anim.loading);
frameAnimation = (AnimationDrawable) iv.getBackground();
frameAnimation.setOneShot(true); //为真的时候最后一针会停下
}
public void StopAnimation(){
flag = true;
System.out.println(flag);
frameAnimation.stop();
iv.setVisibility(View.GONE);
tv = (TextView)findViewById(R.id.text);
tv.setText("启动成功！");
}
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
frameAnimation.start();
new Thread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
try {
Thread.sleep(2000); // 线程休眠时为什么主线程也不运行
handler.sendMessage(Message.obtain());
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}
}
其中在onCreate 中创建了线程然后sleep，出现了一个问题，那就是界面没有显示出来
界面完全显示出来要等到 onWindowFoucosChanged时才可以
还有一点，界面只能在UI主线程中更改，所以，我们要去实现handler机制来进行通信。
关于animation的使用，还有一点就是xml的编写
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false"> <item android:drawable="@drawable/loader_frame_1" android:duration="300" /> <item android:drawable="@drawable/loader_frame_2" android:duration="300" /> <item android:drawable="@drawable/loader_frame_3" android:duration="300" /> <item android:drawable="@drawable/loader_frame_4" android:duration="300" /> <item android:drawable="@drawable/loader_frame_5" android:duration="300" /> <item android:drawable="@drawable/loader_frame_6" android:duration="300" /> </animation-list>
其中包括每一帧的图片，和持续的时间。