如何在android编程中使用wait()方法来实现启动?

时间:2012-12-09 14:24:03

标签: android splash-screen time-wait

我想为我的Android应用程序做一个启发。该功能是当应用程序打开时,首先显示启动页面。直到从GPS获得第一个数据,然后它转向主要活动。在logcat报告的代码中,wait()存在一些问题。

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;

public class splash extends Activity
{   int waittime;
    public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);
        setContentView(R.layout.splash);
        final TextView text=(TextView)findViewById(R.id.textView1);
        text.setText("Waiting for the GPS data update!");
        LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        String provider = locationManager.GPS_PROVIDER;
        int c=0;
        for(int i=0; i<20;i++)
        {  
            Location location = locationManager.getLastKnownLocation(provider);
                 //get the location data from every loop
            if(location!=null)//if get the data, then turn to the main activity
            {
                new Handler().postDelayed(new Runnable() {
                    public void run() {

                        Intent mainIntent = new Intent(splash.this, MainActivity.class);
                        splash.this.startActivity(mainIntent);
                    splash.this.finish();
                    }
                }, 1000);
            }
                else
                {
                    try {
                        wait(3000);//if not get the data, wait 3 seconds until the next loop
                    } catch (InterruptedException e) {

                        e.printStackTrace();
                    }
                }
            }

        }
    }

logcat信息如下: enter image description here

2 个答案:

答案 0 :(得分:0)

为了在对象上调用wait(),您必须在该对象上保持同步锁(尽管在线程等待时实际释放了锁)。 还有thread.sleep,如果它更好,但我不确定它是否会。

答案 1 :(得分:0)

使用Thread.sleep而不是wait(),如

 try {
            Thread.sleep(1500);
     }
    catch (InterruptedException e)
     {
              e.printStackTrace();
     }