我希望我的程序在创建时运行ClosestObject函数＆amp;当用户点击按钮时，它应该运行ShowMap函数并显示map..how当它结合时它会崩溃这是我的代码
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
showButton=(Button) findViewById(R.id.button1);
result = (TextView) findViewById(R.id.text1);
try {
**//here I run Closest Object so I can display the result on the text box**
String Add= ClosestObject();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
**// Here I set the test with closestObject result**
result.setText(buff.toString());
**//So when I click show the map**
View.OnClickListener myhandler1 = new View.OnClickListener() {
public void onClick(View v) {
new TestGoogleMaps().execute("");
}
};
gps = new GPSTracker(MainActivity.this);
// here it reads from gps
if(gps.canGetLocation()){
latitude = gps.getLatitude();
longitude = gps.getLongitude();
}
else
{
gps.showSettingsAlert();
}
}
class TestGoogleMaps extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
try {
ShowMap();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
}
return null;
}
}
}
这里是logcat
04-06 21:40:31.774: W/dalvikvm(963): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-06 21:40:31.814: E/AndroidRuntime(963): FATAL EXCEPTION: main
04-06 21:40:31.814: E/AndroidRuntime(963): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.distancemap/com.example.distancemap.MainActivity}: android.os.NetworkOnMainThreadException
04-06 21:40:31.814: E/AndroidRuntime(963): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-06 21:40:31.814: E/AndroidRuntime(963): at and roid.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.os.Handler.dispatchMessage(Handler.java:99)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.os.Looper.loop(Looper.java:137)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-06 21:40:31.814: E/AndroidRuntime(963): at java.lang.reflect.Method.invokeNative(Native Method)
04-06 21:40:31.814: E/AndroidRuntime(963): at java.lang.reflect.Method.invoke(Method.java:511)
04-06 21:40:31.814: E/AndroidRuntime(963): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-06 21:40:31.814: E/AndroidRuntime(963): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-06 21:40:31.814: E/AndroidRuntime(963): at dalvik.system.NativeStart.main(Native Method)
04-06 21:40:31.814: E/AndroidRuntime(963): Caused by: android.os.NetworkOnMainThreadException
04-06 21:40:31.814: E/AndroidRuntime(963): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
04-06 21:40:31.814: E/AndroidRuntime(963): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
04-06 21:40:31.814: E/AndroidRuntime(963): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
04-06 21:40:31.814: E/AndroidRuntime(963): at java.net.InetAddress.getAllByName(InetAddress.java:214)
04-06 21:40:31.814: E/AndroidRuntime(963): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
04-06 21:40:31.814: E/AndroidRuntime(963): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
04-06 21:40:31.814: E/AndroidRuntime(963): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
04-06 21:40:31.814: E/AndroidRuntime(963): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
04-06 21:40:31.814: E/AndroidRuntime(963): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
04-06 21:40:31.814: E/AndroidRuntime(963): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
04-06 21:40:31.814: E/AndroidRuntime(963): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
04-06 21:40:31.814: E/AndroidRuntime(963): at com.example.distancemap.MainActivity.ClosestObject(MainActivity.java:159)
04-06 21:40:31.814: E/AndroidRuntime(963): at com.example.distancemap.MainActivity.onCreate(MainActivity.java:63)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.app.Activity.performCreate(Activity.java:5104)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-06 21:40:31.814: E/AndroidRuntime(963): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-06 21:40:31.814: E/AndroidRuntime(963): ... 11 more
答案 0 :(得分：0)
04-06 21:40:31.814: E/AndroidRuntime(963): Caused by: android.os.NetworkOnMainThreadException
您错过了结束}
这有助于解决这个问题。
class TestGoogleMaps extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
try {
ShowMap();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
}
return null;
}
}
}