我有两节课。一个是Main，另一个是HelloWorld。当我单击 main.xml 中定义的按钮时，我希望它显示 HelloWorld 类中定义的消息以启动。当我单击按钮时，它不执行任何操作。代码如下。如果还有什么需要提出的，请告诉我。谢谢
主.java
public class Main extends MapActivity implements LocationListener {
/** Called when the activity is first created. */
MapView map;
long start;
long stop;
int x, y;
GeoPoint touchedPoint;
Drawable d;
List<Overlay> overlayList;
LocationManager lm;
String towers;
int lat ;
int longi;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button orderButton = (Button)findViewById(R.id.button1);
orderButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent(Main.this, HelloWorld.class);
startActivity(intent);
};
});
map = (MapView)findViewById(R.id.mv);
map.setBuiltInZoomControls(true);
Touchy t = new Touchy();
overlayList = map.getOverlays();
overlayList.add(t);
d = getResources().getDrawable(R.drawable.pinn);
//Placing pintpoint
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria crit = new Criteria();
towers = lm.getBestProvider(crit, false);
Location location = lm.getLastKnownLocation(towers);
if (location != null){
lat = (int) (location.getLatitude() *1E6);
longi= (int) (location.getLongitude() *1E6);
GeoPoint ourLocation = new GeoPoint(lat,longi);
OverlayItem overlayItem = new OverlayItem(ourLocation, "Hi!!", "2nd");
CustomPinPoint custom = new CustomPinPoint(d, Main.this);
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
}else{
Toast.makeText(Main.this, "Couldnt get provider", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
lm.removeUpdates(this);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
lm.requestLocationUpdates(towers, 500, 1, this );
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
class Touchy extends Overlay{
public boolean onTouchEvent(MotionEvent e, MapView m){
if (e.getAction() == MotionEvent.ACTION_DOWN){
start = e.getEventTime();
}
if (e.getAction() == MotionEvent.ACTION_UP){
stop = e.getEventTime();
x = (int) e.getX();
y = (int) e.getY();
touchedPoint = map.getProjection().fromPixels(x, y);
}
if (stop - start > 1500){
AlertDialog alert = new AlertDialog.Builder(Main.this).create();
alert.setTitle("Pick Option");
alert.setButton("Hello", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
OverlayItem overlayItem = new OverlayItem(touchedPoint, "Hi!!", "2nd");
CustomPinPoint custom = new CustomPinPoint(d, Main.this);
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
}
});
alert.setButton3("Get Address", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Geocoder geocoder = new Geocoder(getBaseContext(), Locale.getDefault());
try{
List<Address> address = geocoder.getFromLocation(touchedPoint.getLatitudeE6() / 1E6, touchedPoint.getLongitudeE6() / 1E6 , 1);
if (address.size() > 0){
String display = "";
for (int i = 0; i<address.get(0).getMaxAddressLineIndex(); i++){
display += address.get(0).getAddressLine(i) + "\n";
}
Toast t = Toast.makeText(getBaseContext(), display, Toast.LENGTH_LONG);
t.show();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
}
}});
alert.setButton2("Toggle View", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if (map.isSatellite()){
map.setSatellite(false);
map.setStreetView(true);
}else{
map.setStreetView(false);
map.setSatellite(true);
}
}
});
alert.setButton("Place a Pin", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
OverlayItem overlayItem = new OverlayItem(touchedPoint, "Hi!!", "2nd");
CustomPinPoint custom = new CustomPinPoint(d,Main.this);
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
}
});
alert.show();
return true;
}
return false;
}
}
public void onLocationChanged(Location l) {
// TODO Auto-generated method stub
lat = (int) (l.getLatitude() *1E6);
longi = (int) (l.getLongitude() *1E6);
GeoPoint ourLocation = new GeoPoint(lat,longi);
OverlayItem overlayItem = new OverlayItem(ourLocation, "Hi!!", "2nd");
CustomPinPoint custom = new CustomPinPoint(d, Main.this);
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
HelloWorld.java
import com.google.android.maps.OverlayItem;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class HelloWorld extends Activity
{
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
Toast.makeText(HelloWorld.this, "you clicked on button![enter image description here][3]", Toast.LENGTH_LONG).show();
}
});
} }
我也写过
<activity android:name=".HelloWorld" />
在我的清单中