我正在编写一个在登录屏幕后立即显示Google地图的应用程序。 Build Target设置为2.3，我的设备运行：
1）三星Galaxy Ace（2.3.4） 2）Motorolla Xoom（3.1）
我在Android模拟器上试用我的应用程序，运行正常。登录和地图显示。
当我通过计算机上的USB连接两个设备并选择它们来运行应用程序时（注意：选择时，构建目标旁边有一个橙色警告标志），登录屏幕显示正常，当我点击“登录”时在“应用程序在Motorolla上崩溃并冻结了一段时间然后在我的Galaxy Ace上没有任何作用。
请注意，他们都可以连接到互联网。
通过USB连接运行应用程序时设备的Logcat：
1）三星Galaxy Ace
04-06 00:24:21.599: I/InputReader(162): dispatchTouch::touch event's action is 0
04-06 00:24:21.599: I/InputDispatcher(162): Delivering touch to current input target: action: 0, channel '40796920 com.cylbs.android/com.cylbs.android.MainActivity (server)'
04-06 00:24:21.699: I/InputReader(162): dispatchTouch::touch event's action is 1
04-06 00:24:21.699: I/InputDispatcher(162): Delivering touch to current input target: action: 1, channel '40796920 com.cylbs.android/com.cylbs.android.MainActivity (server)'
04-06 00:24:27.709: W/PowerManagerService(162): Timer 0x3->0x3|0x1
04-06 00:24:28.559: D/BatteryService(162): update start
04-06 00:24:28.569: D/BatteryService(162): update start
04-06 00:24:28.579: D/BatteryService(162): update start
2）Motorolla Xoom
04-06 00:27:13.490: D/AndroidRuntime(3163): Shutting down VM
04-06 00:27:13.490: W/dalvikvm(3163): threadid=1: thread exiting with uncaught exception (group=0x40154760)
04-06 00:27:13.510: E/AndroidRuntime(3163): FATAL EXCEPTION: main
04-06 00:27:13.510: E/AndroidRuntime(3163): android.os.NetworkOnMainThreadException
04-06 00:27:13.510: E/AndroidRuntime(3163): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
04-06 00:27:13.510: E/AndroidRuntime(3163): at dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:368)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:208)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:431)
04-06 00:27:13.510: E/AndroidRuntime(3163): at java.net.Socket.connect(Socket.java:901)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:75)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:304)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:292)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:274)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:217)
04-06 00:27:13.510: E/AndroidRuntime(3163): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:624)
04-06 00:27:13.510: E/AndroidRuntime(3163): at com.cylbs.android.MainActivity.tryLogin(MainActivity.java:65)
04-06 00:27:13.510: E/AndroidRuntime(3163): at com.cylbs.android.MainActivity$1.onClick(MainActivity.java:41)
04-06 00:27:13.510: E/AndroidRuntime(3163): at android.view.View.performClick(View.java:3110)
04-06 00:27:13.510: E/AndroidRuntime(3163): at android.view.View$PerformClick.run(View.java:11928)
04-06 00:27:13.510: E/AndroidRuntime(3163): at android.os.Handler.handleCallback(Handler.java:587)
04-06 00:27:13.510: E/AndroidRuntime(3163): at android.os.Handler.dispatchMessage(Handler.java:92)
04-06 00:27:13.510: E/AndroidRuntime(3163): at android.os.Looper.loop(Looper.java:132)
04-06 00:27:13.510: E/AndroidRuntime(3163): at android.app.ActivityThread.main(ActivityThread.java:4025)
04-06 00:27:13.510: E/AndroidRuntime(3163): at java.lang.reflect.Method.invokeNative(Native Method)
04-06 00:27:13.510: E/AndroidRuntime(3163): at java.lang.reflect.Method.invoke(Method.java:491)
04-06 00:27:13.510: E/AndroidRuntime(3163): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
04-06 00:27:13.510: E/AndroidRuntime(3163): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
04-06 00:27:13.510: E/AndroidRuntime(3163): at dalvik.system.NativeStart.main(Native Method)
这是我的MainActivity的代码，它只是Login和Home活动，它是地图出现的地方：
MainActivity：
package com.cylbs.android;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private Button login;
private EditText username, password;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
login = (Button) findViewById(R.id.logIn);
username = (EditText) findViewById(R.id.username);
password = (EditText) findViewById(R.id.password);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String mUsername = username.getText().toString();
String mPassword = password.getText().toString();
tryLogin(mUsername, mPassword);
}
});
}
public boolean tryLogin(String mUsername, String mPassword)
{
HttpURLConnection connection;
OutputStreamWriter request = null;
URL url = null;
String response = null;
String parameters = "username="+mUsername+"&password="+mPassword;
final TextView result = (TextView) findViewById(R.id.result);
try
{
url = new URL("http://10.0.2.2/database_test/index.php");
connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestMethod("POST");
request = new OutputStreamWriter(connection.getOutputStream());
request.write(parameters);
request.flush();
request.close();
String line = "";
InputStreamReader isr = new InputStreamReader(connection.getInputStream());
BufferedReader reader = new BufferedReader(isr);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null)
{
sb.append(line);
}
// Response from server after login process will be stored in response variable.
response = sb.toString();
// You can perform UI operations here
Toast.makeText(this,"."+ response +".", 0).show();
if (response.equals("Success"))
{
Session obj = new Session();
obj.setUsername(mUsername);
Intent myIntent = new Intent(MainActivity.this, Home.class);
startActivity(myIntent);
result.setText("Login successful");
}
else
{
result.setText("Login fail. Please try again");
}
isr.close();
reader.close();
}
catch(IOException e)
{
// Error
}
return true;
}
}
Home活动（扩展MapActivity）
package com.cylbs.android;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Home extends MapActivity {
MapController mControl;
GeoPoint geoP;
MapView mapV;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
mapV = (MapView) findViewById(R.id.mapView);
mapV.displayZoomControls(true);
mapV.setBuiltInZoomControls(true);
double lat = 40.8;
double longi = -96.666;
geoP = new GeoPoint((int) (lat *1E6), (int) (longi *1E6));
mControl = mapV.getController();
mControl.animateTo(geoP);
mControl.setZoom(13);
Button emergencies = (Button) findViewById(R.id.emergencyButton);
emergencies.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent myIntent = new Intent(Home.this, EmergencyList.class);
Home.this.startActivity(myIntent);
}
});
Button disruptions = (Button) findViewById(R.id.disruptionButton);
disruptions.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent myIntent2 = new Intent(Home.this, DisruptionList.class);
startActivity(myIntent2);
}
});
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
有什么想法吗？思考？ 这一切都是现在。 非常感谢你。
P.S。 我是一个新的Android开发人员。
答案 0 :(得分：1)
我预先假设您使用的是差异化的Maps API KEY来模拟应用，而另一种不同的MD5签名用于在设备上运行应用。请查看here。
答案 1 :(得分：1)
如果其他人有同样的问题我认为我找到了解决方案。
我查看了LogCat中的错误：
04-06 00:27:13.510: E/AndroidRuntime(3163): android.os.NetworkOnMainThreadException
根据这个http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html
似乎某些（较新的）Android版本不允许在MainActivity中使用互联网连接请求。
即使我的目标是Android版本10（2.3），我仍然遇到错误，所以我将项目目标更改为版本8，现在看起来工作正常。