问题描述
我有一个Android应用程序，显示启动画面3秒钟。之后，MainActivity被加载。
I have an Android App, which shows a "Splash Screen" for 3 seconds. After that, the MainActivity gets loaded.
不幸的是，MainActivity需要额外的~4秒才能加载。在第一次启动时甚至更长。但是当加载App时，一切都运行顺畅。
Unfortunately the MainActivity takes additional ~4 seconds to load. On first startup even longer. However when the App is loaded, everything runs smooth.
现在，在Splash Screen的显示过程中，如何实现MainActivity的加载？它应该显示一个图像，直到整个东西完全加载。
我已经阅读了有关Async-Task的内容，但我不知道该放在哪里以及如何正确使用它。有人可以帮帮我吗？
Now how can I achieve it, that the MainActivity gets loaded, during the display of the Splash Screen? It just should display an image until the whole thing loaded completely.I have read about Async-Task, but I'm not sure where to put it and how to use it properly. Can someone help me please?
SplashScreen.java
public class SplashScreen extends Activity {
private static int SPLASH_TIME_OUT = 3000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_startup);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
Intent i = new Intent(SplashScreen.this, MainActivity.class);
startActivity(i);
finish();
}
}, SPLASH_TIME_OUT);
}
}
MainActivity.java
public class MainActivity extends Activity implements OnClickListener, MediaController.MediaPlayerControl {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Some heavy processing
//starting services
//starting Google Text to Speech
//and so on...
}
}
推荐答案
如果没有关于启动屏幕显示时间的具体限制，您可以通过以下方式使用 AsyncTask ：
If there are no specific constraints about the time the splash screen should be shown, you could use the AsyncTask in the following way:
public class SplashScreen extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_startup);
startHeavyProcessing();
}
private void startHeavyProcessing(){
new LongOperation().execute("");
}
private class LongOperation extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
//some heavy processing resulting in a Data String
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
Thread.interrupted();
}
}
return "whatever result you have";
}
@Override
protected void onPostExecute(String result) {
Intent i = new Intent(SplashScreen.this, MainActivity.class);
i.putExtra("data", result);
startActivity(i);
finish();
}
@Override
protected void onPreExecute() {}
@Override
protected void onProgressUpdate(Void... values) {}
}
}
如果结果数据的性质不同于你可以将一个 Parcelable 对象作为一个字符串作为你的活动的额外内容。在 onCreate 中，您可以使用以下方法检索数据：
If the resulting data if of another nature than a String you could put a Parcelable Object as an extra to your activity. In onCreate you can retrieve the data with:
getIntent（）。getExtras.getString （'数据'）;
这篇关于Android加载时显示Splash-Screen的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！