我不知道我的代码有什么问题,因为我什么都试过了。我创建了警报对话框,并且我看到的所有网络都向其他人显示了警报对话框。我的应用程序不显示对话框。这是 Main.java:
package com.natasam.mapstwo;
import java.util.List;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.MotionEvent;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
public class Main extends MapActivity {
MapView map;
long start;
long stop;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
map= (MapView)findViewById(R.id.mvMain);
map.setBuiltInZoomControls(true);
Touch t= new Touch();
List<Overlay> overlayList = map.getOverlays();
overlayList.add(t);
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
class Touch extends Overlay{
public boolean OnTouchEvent(MotionEvent e, MapView v){
if(e.getAction()== MotionEvent.ACTION_DOWN){
start=e.getEventTime();
}
if(e.getAction()== MotionEvent.ACTION_UP){
stop=e.getEventTime();
}
if(stop- start > 1500){
Builder alert=new AlertDialog.Builder(Main.this);
alert.setTitle("pick an option");
alert.setMessage("You must pick an option");
alert.setPositiveButton("option 1", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
alert.setNegativeButton("pick address", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
alert.setNeutralButton("option 3", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
alert.create();
alert.show();
return true;
}
return false;
}
}
}
这是 .xml 文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.google.android.maps.MapView
android:id="@+id/mvMain"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:enabled="true"
android:clickable="true"
android:apiKey="a valid key" />
</RelativeLayout>
和清单:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.natasam.mapstwo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar">
<uses-library android:name="com.google.android.maps" />
<activity
android:name=".Main"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
怎么了?它显示地图但不显示警报对话框...