Android程序开始的等待动画或LOGO
2015-07-31 14:31
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在进入程序前,一般都要有一个欢迎图片LOGO或者动画,等待几秒后隐藏Logo或做Intent跳转:
可以使用HandlerThread新建一个线程来执行等待动作,也可以使用Android的TimerTask:
1.HandlerThread:
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201403/99158580eca2d43c2efb979373be0544.png)
public class WelcomeAct extends Activity {
protected static final String TAG = "WelcomeAct";
private Handler handler; //因为要重写构造方法,所以不能用匿名内部类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置登录无标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.welcome);
HandlerThread myThread = new HandlerThread("myHandlerThread");
myThread.start();
handler = new myHandler(myThread.getLooper());
handler.post(new Runnable() {
@Override
public void run() {
try {
//耗时的操作
Thread.sleep(2500);
//handler主要用于异步消息的处理,使用sendMessage()后,方法立即返回,Message放入消息队列,
//等待Message出消息队列,由handlerMessage(Message msg)通知UI线程子线程已经挂起,并使用返回的msg。
handler.sendMessage(handler.obtainMessage());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
}
class myHandler extends Handler{
public myHandler(Looper looper) {
super(looper);
}
//负责从消息队列中取消息给UI线程
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Intent intent = new Intent(WelcomeAct.this, LoginAct.class);
startActivity(intent);
}
}
}
2.使用TimerTask:
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201403/99158580eca2d43c2efb979373be0544.png)
public class WelcomeAct extends Activity {
protected static final int LOGINOVER = 0;
protected static final String TAG = "WelcomeAct";
private Handler handler; //因为要重写构造方法,所以不能用匿名内部类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置登录无标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.welcome);
ProgressBar loading = (ProgressBar)findViewById(R.id.loading);
loading.setVisibility(View.VISIBLE);
HandlerThread myThread = new HandlerThread("myHandlerThread");
myThread.start();
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.what == LOGINOVER){
Log.i(TAG, Thread.currentThread().getName());
Intent intent = new Intent(WelcomeAct.this, LoginAct.class);
startActivity(intent);
}
}
};
tt.run();
}
TimerTask tt = new TimerTask() {
@Override
public void run() {
Log.i(TAG, Thread.currentThread().getName());
handler.sendMessageDelayed(handler.obtainMessage(LOGINOVER), 3000);
}
};
}
也可设计为没有Intent跳转,使用View.setVisibility(View.GONE);和 View.VISIBLE来达到想要的效果。
使用TimerTask,打印线程名可以看出,系统没有新开线程,而且达到了阻塞等待的目的,代码量小,推荐用。
可以使用HandlerThread新建一个线程来执行等待动作,也可以使用Android的TimerTask:
1.HandlerThread:
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201403/99158580eca2d43c2efb979373be0544.png)
public class WelcomeAct extends Activity {
protected static final String TAG = "WelcomeAct";
private Handler handler; //因为要重写构造方法,所以不能用匿名内部类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置登录无标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.welcome);
HandlerThread myThread = new HandlerThread("myHandlerThread");
myThread.start();
handler = new myHandler(myThread.getLooper());
handler.post(new Runnable() {
@Override
public void run() {
try {
//耗时的操作
Thread.sleep(2500);
//handler主要用于异步消息的处理,使用sendMessage()后,方法立即返回,Message放入消息队列,
//等待Message出消息队列,由handlerMessage(Message msg)通知UI线程子线程已经挂起,并使用返回的msg。
handler.sendMessage(handler.obtainMessage());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
}
class myHandler extends Handler{
public myHandler(Looper looper) {
super(looper);
}
//负责从消息队列中取消息给UI线程
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Intent intent = new Intent(WelcomeAct.this, LoginAct.class);
startActivity(intent);
}
}
}
2.使用TimerTask:
Java代码
![](https://oscdn.geek-share.com/Uploads/Images/Content/201403/99158580eca2d43c2efb979373be0544.png)
public class WelcomeAct extends Activity {
protected static final int LOGINOVER = 0;
protected static final String TAG = "WelcomeAct";
private Handler handler; //因为要重写构造方法,所以不能用匿名内部类
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置登录无标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.welcome);
ProgressBar loading = (ProgressBar)findViewById(R.id.loading);
loading.setVisibility(View.VISIBLE);
HandlerThread myThread = new HandlerThread("myHandlerThread");
myThread.start();
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.what == LOGINOVER){
Log.i(TAG, Thread.currentThread().getName());
Intent intent = new Intent(WelcomeAct.this, LoginAct.class);
startActivity(intent);
}
}
};
tt.run();
}
TimerTask tt = new TimerTask() {
@Override
public void run() {
Log.i(TAG, Thread.currentThread().getName());
handler.sendMessageDelayed(handler.obtainMessage(LOGINOVER), 3000);
}
};
}
也可设计为没有Intent跳转,使用View.setVisibility(View.GONE);和 View.VISIBLE来达到想要的效果。
使用TimerTask,打印线程名可以看出,系统没有新开线程,而且达到了阻塞等待的目的,代码量小,推荐用。
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