私Mainのクラスでは、何かをするために別のクラスを呼び出し、データをクラスに戻す必要がありMainますが、アプリケーションの起動時に何らかの理由でクラッシュします。
私のMainアクティビティ-getLocation()場所を返し、に割り当てることと関係があるPointため、これらの行を削除すると正常に機能するため、クラッシュします。
public class Main extends Activity {
ArrayList<Point> gpsCoordinates = new ArrayList<Point>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pages);
vf = (ViewFlipper) findViewById(R.id.viewFlipper);
try {
getLocation(null);
} catch (InterruptedException e) {}
}
public synchronized void getLocation(View view) throws InterruptedException
{
LocationHandler lh = new LocationHandler();
lh.getLocation(view,this);
Location location = new Location(lh.returnLocation());
Point point = new Point(location.getLongitude(),location.getLatitude());
gpsCoordinates.add(point);
}
}
マイポイントクラス：
public class Point {
private double x;
private double y;
public Point(double x, double y) {
this.setX(x);
this.setY(y);
}
public Point(Point point) {
this.setX(point.getX());
this.setY(point.getY());
}
public String toString(Point point)
{
String stringPoint = "";
stringPoint = "(" + point.getX() + "," + point.getY() + ")";
return stringPoint;
}
public void setX(double x2) {
this.x = x2;
}
public double getX() {
return this.x;
}
public void setY(double y2) {
this.y = y2;
}
public double getY() {
return this.y;
}
}
私がメインから呼んでいるクラス：
public class LocationHandler {
Location location;
public synchronized void getLocation(final View view, final Main main) throws InterruptedException
{
Thread t = new Thread(){
public synchronized void run(){
location = new Location(mlocListener.returnLocation());
}
};
t.start();
}
public Location returnLocation()
{
return location;
}
}
エラーログ：
12-20 12:35:11.348: E/AndroidRuntime(3466): FATAL EXCEPTION: main
12-20 12:35:11.348: E/AndroidRuntime(3466): java.lang.RuntimeException: Unable to start activity ComponentInfo{mfc.generalgui6api8/mfc.generalgui6api8.Main}: java.lang.NullPointerException
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.os.Handler.dispatchMessage(Handler.java:99)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.os.Looper.loop(Looper.java:123)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-20 12:35:11.348: E/AndroidRuntime(3466): at java.lang.reflect.Method.invokeNative(Native Method)
12-20 12:35:11.348: E/AndroidRuntime(3466): at java.lang.reflect.Method.invoke(Method.java:521)
12-20 12:35:11.348: E/AndroidRuntime(3466): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
12-20 12:35:11.348: E/AndroidRuntime(3466): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12-20 12:35:11.348: E/AndroidRuntime(3466): at dalvik.system.NativeStart.main(Native Method)
12-20 12:35:11.348: E/AndroidRuntime(3466): Caused by: java.lang.NullPointerException
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.location.Location.set(Location.java:123)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.location.Location.<init>(Location.java:116)
12-20 12:35:11.348: E/AndroidRuntime(3466): at mfc.generalgui6api8.Main.getLocation(Main.java:133)
12-20 12:35:11.348: E/AndroidRuntime(3466): at mfc.generalgui6api8.Main.onCreate(Main.java:44)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-20 12:35:11.348: E/AndroidRuntime(3466): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-20 12:35:11.348: E/AndroidRuntime(3466): ... 11 more