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此代码是按照本教程编写的：http ://www.techsono.com/consult/update-android-gui-timer/

我不明白为什么当我尝试在我的设备上运行它时，我会从这段代码中得到一个非法参数异常。我也不确定是什么导致了非法参数异常。我正在运行的代码是我尝试使客户端连接到 IP 地址上的服务器（此 IP 地址将被更改）以接收信息，然后更新 Android Gui 以显示所述信息。如果有帮助，开始布局中的文本视图是 gui 中正在更新的内容吗？

如果我对此的解释似乎有点令人困惑，我提前道歉，这对我来说非常令人困惑：3 我想我理解代码在做什么，但是对代码的任何澄清以及为什么它不起作用以及什么问题会很好.

这是我的代码：

package com.example.clienttest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.widget.TextView;

public class ClientTestMain extends Activity {

final Handler myHandler = new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_client_test_main);


    Timer myTimer = new Timer();
    myTimer.schedule(new TimerTask(){
        @Override
        public void run(){
            UpdateGUI();}},0,0);
        }


final Runnable myRunnable = new Runnable(){
            @Override
            public void run(){

                TextView Header = (TextView) findViewById(R.id.textView4);
                TextView Time = (TextView) findViewById(R.id.textView4);
                TextView TrackId = (TextView) findViewById(R.id.textView4);
                TextView Latitude = (TextView) findViewById(R.id.textView4);
                TextView Longitude = (TextView) findViewById(R.id.textView4);
                TextView Depth = (TextView) findViewById(R.id.textView4);
                TextView Speed = (TextView) findViewById(R.id.textView4);
                TextView Heading = (TextView) findViewById(R.id.textView4);

                try{
                    while(true){
                    Socket infoSocket = new Socket("128.23.1.0", 2000);
                    InputStreamReader stream = new InputStreamReader(infoSocket.getInputStream());
                    BufferedReader reader = new BufferedReader(stream);
                    String message = reader.readLine();
                    String[] op = message.split(",");
                    Header.setText(op[0]);
                    Time.setText(op[1]);
                    TrackId.setText(op[2]);
                    Latitude.setText(op[3]);
                    Longitude.setText(op[4]);
                    Depth.setText(op[5]);
                    Speed.setText(op[6]);
                    Heading.setText(op[7]);
                    TimeUnit.SECONDS.sleep(1);
                    }
                }catch(IOException ex){
                    ex.printStackTrace();
                }catch (InterruptedException e) {
                }

            }};



  private void UpdateGUI(){
      myHandler.post(myRunnable);
  }



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.client_test_main, menu);
    return true;
}

}

这是我的 LogCat：

09-04 12:04:23.453: D/AndroidRuntime(18628): Shutting down VM
09-04 12:04:23.453: W/dalvikvm(18628): threadid=1: thread exiting with uncaught exception    (group=0x40bea1f8)
09-04 12:04:23.453: E/AndroidRuntime(18628): FATAL EXCEPTION: main
09-04 12:04:23.453: E/AndroidRuntime(18628): java.lang.RuntimeException: Unable to start  activity ComponentInfo{com.example.clienttest/com.example.clienttest.ClientTestMain}: java.lang.IllegalArgumentException
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.ActivityThread.access$600(ActivityThread.java:128)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.os.Looper.loop(Looper.java:137)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.ActivityThread.main(ActivityThread.java:4514)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at java.lang.reflect.Method.invokeNative(Native Method)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at java.lang.reflect.Method.invoke(Method.java:511)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at dalvik.system.NativeStart.main(Native Method)
09-04 12:04:23.453: E/AndroidRuntime(18628): Caused by: java.lang.IllegalArgumentException
09-04 12:04:23.453: E/AndroidRuntime(18628):    at java.util.Timer.schedule(Timer.java:479)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at com.example.clienttest.ClientTestMain.onCreate(ClientTestMain.java:28)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.Activity.performCreate(Activity.java:4465)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053)
09-04 12:04:23.453: E/AndroidRuntime(18628):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
09-04 12:04:23.453: E/AndroidRuntime(18628):    ... 11 more
09-04 12:09:29.781: I/Process(18628): Sending signal. PID: 18628 SIG: 9
4

1 回答 1

1

您不能传递期间值 = 0

投掷

IllegalArgumentException 如果延迟 < 0 或周期 <= 0。

如果 Timer 已被取消，或者任务已被安排或取消，则 IllegalStateException。

myTimer.schedule(new TimerTask(){
        @Override
        public void run(){
            UpdateGUI();}},0,1000); //UPDATE HERE
        }
于 2013-09-04T11:24:02.137 回答