我收到此代码错误。为什么呼呼123123123
Thread timer = new Thread()
{
public void run()
{
try
{
sleep(1500);
splash.setImgeResource(R.drawable.dilclogo);
sleep(1500);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
finally
{
Intent intent = new Intent(MainActivity.this, MenuScreen.class);
startActivity(intent);
}
}
};
timer.start();
这是因为您不能直接从任何其他线程访问您的 UI/主线程。不过，您可以使用以下方法访问您的 UI 线程：
您还可以阅读这篇关于android 中的线程的文章，以帮助您更好地理解这个概念。
放 splash.setImgeResource(R.drawable.dilclogo); 进入 runOnUiThread 。
Thread timer = new Thread()
{
public void run()
{
try
{
sleep(2000);
runOnUiThread(new Runnable() {
public void run() {
splash.setImageResource(R.drawable.billboard_image);
}
});
sleep(2000);
runOnUiThread(new Runnable() {
public void run() {
splash.setImageResource(R.drawable.square);
}
});
}
catch (InterruptedException e)
{
e.printStackTrace();
}
finally
{
System.out.println("finally");
}
}
};
timer.start();
您不能在 android 系统上使用普通线程。给你一些关于 android 线程的例子：D
---> 安卓异步任务
Android 开发者 - Android Asynctask
您可以使用它来对 android 中的 UI 进行一些加载效果。
---> runOnUiThread
在你的情况下，我建议使用这个。你可以在这里了解更多细节。
用途::
runOnUiThread(new Runnable() {
@Override
public void run() {
// Do you ui update here
}
});
您应该在 ui 线程上更新 ui。使用 runonUithread。
runOnUiThread(new Runnable() {
@Override
public void run() {
// set image to imageview here
// ui should be updated on the ui thread.
// you cannot update ui from a background thread
}
});
但我建议你使用处理程序。
public class Splash extends Activity {
//stopping splash screen starting home activity.
private static final int STOPSPLASH = 0;
//time duration in millisecond for which your splash screen should visible to
//user. here i have taken half second
private static final long SPLASHTIME = 500;
//handler for splash screen
private Handler splashHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case STOPSPLASH:
//Generating and Starting new intent on splash time out
Intent intent = new Intent(Splash.this,
MainActivity.class);
startActivity(intent);
Splash.this.finish();
break;
}
super.handleMessage(msg);
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
//Generating message and sending it to splash handle
Message msg = new Message();
msg.what = STOPSPLASH;
splashHandler.sendMessageDelayed(msg, SPLASHTIME);
}
}
飞溅.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" android:background="@drawable/mydrawable">
// have a imageview and set background to imageview
</RelativeLayout>
使用处理程序和后延迟
public class Splash extends Activity {
private static final int SPLASH_TIME = 2 * 1000;// 3 seconds
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
ImageView iv= (ImageView) findViewById(R.id.imageView1);
iv.setBackgroundResource(R.drawable.afor);
try {
new Handler().postDelayed(new Runnable() {
public void run() {
Intent intent = new Intent(Splash.this,
MainActivity.class);
startActivity(intent);
Splash.this.finish();
}
}, SPLASH_TIME);
} catch(Exception e)
{
e.printStacktrace();
}
}
@Override
public void onBackPressed() {
this.finish();
super.onBackPressed();
}
}
飞溅.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" android:background="#ffffaa">
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_centerInParent="true"
/>
</RelativeLayout>
public class vv extends Activity {
int b[] = {R.drawable.a, R.drawable.m, R.drawable.b, R.drawable.j, R.drawable.er, R.drawable.chan, R.drawable.vv};
public ImageView i;
int z = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
i = (ImageView) findViewById(R.id.image);
i.setImageResource(b[0]);
Thread timer = new Thread() {
public void run() {
try {
sleep(2000);
for (z = 0; z < b.length + 2; z++) {
if (z < b.length) {
sleep(2000);
runOnUiThread(new Runnable() {
public void run() {
i.setImageResource(b[z]);
}
});
} else {
z = 0;
}
}
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
System.out.println("finally");
}
}
};
timer.start();
}
}
也许考虑使用
AsyncTask.execute(new Runnable {
public void run() {
splash.setImageResource(R.drawable.square);
}
});