Question

求android高手看看，想从一个activity延迟数秒自动跳到下一个activity，总是实现不了

public class HomeActivity extends Activity {

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home); }

Handler handler = new Handler();
Runnable updateThread = new Runnable(){
public void run(){
Intent intent = new Intent();
intent.setClass(HomeActivity.this,LoginActivity.class);

HomeActivity.this.startActivity(intent);
handler.postDelayed(updateThread, 300);}

};
｝

Answer 1

页面跳转在handler发送消息之前。先执行跳转再延迟发送消息。handler.postDelayed(updateThread, 300);放置run方法外面，你这样写run方法都没有调用。

追问

我把handler.postDelayed(updateThread, 300);这句放在run方法的外面报错，放在Runnable updateThread = new Runnable(){ ...};这一句的外面还是有错。我真的不明白呀

追答

Handler handler = new Handler();

Runnable updateThread = new Runnable(){
public void run(){
Intent intent = new Intent();
intent.setClass(HomeActivity.this,LoginActivity.class);

HomeActivity.this.startActivity(intent);
finish();

}

};
handler.postDelayed(updateThread, 3000);这样应该没问题了呀。

Answer 2

public class HomeActivity extends Activity implements Runnable {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new Thread(this).start();
}

public void run() {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
Intent intent = new Intent(HomeActivity.this, LoginActivity.class);
startActivity(intent);
finish();
}
}

Answer 3

把postDelayed这句放到updateThread外面才对吧……