这是我主要活动的来源，我尝试在 Android 2.3.7 和 Android 4.1 及更高版本中启动它，它在 Android 2.3.7 中成功运行，但在 Android 4.1 中崩溃。
public class CalculatorActivity extends Activity implements LocationListener
{
protected static final String TAG = "123";
public static Handler h;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
(LocationManager)getSystemService(Context.LOCATION_SERVICE);
final SharedPreferences unitpreference = PreferenceManager.getDefaultSharedPreferences(this);
final String unitstring = unitpreference.getString("unit_type", "");
final int unit = Integer.parseInt(unitstring);
changecityname();
changeusername();
if (unit==1)
{
TextView kms1 = (TextView) findViewById(R.id.textView7);
kms1.setText("kms.");
TextView kml = (TextView) findViewById(R.id.textView8);
kml.setText("km/lt");
TextView kms2 = (TextView) findViewById(R.id.textView9);
kms2.setText("kms.");
TextView rs = (TextView) findViewById(R.id.textView10);
rs.setText("Rs.");
}
else
{
TextView kms1 = (TextView) findViewById(R.id.textView7);
kms1.setText("mi.");
TextView kml = (TextView) findViewById(R.id.textView8);
kml.setText("mi/ga");
TextView kms2 = (TextView) findViewById(R.id.textView9);
kms2.setText("mi.");
TextView rs = (TextView) findViewById(R.id.textView10);
rs.setText("$");
}
clickbutton();
};
private void changeusername()
{
final SharedPreferences currentusername = getSharedPreferences("PREFS_NAME",0);
final String loggedInUser = currentusername.getString("username", "");
TextView loggedInUsername = (TextView) findViewById(R.id.textView11);
loggedInUsername.setText("Logged in as "+loggedInUser);
}
private void changecityname()
{
final SharedPreferences citypreference = PreferenceManager.getDefaultSharedPreferences(this);
final String citystring = citypreference.getString("example_list", "");
int city = Integer.parseInt(citystring);
TextView cityname = (TextView) findViewById(R.id.textView12);
if (city==1)
{
cityname.setText("Panchkula ");
}
else if (city==2)
{
cityname.setText("Chandigarh ");
}
else if (city==3)
{
cityname.setText("Mohali ");
}
else
{
cityname.setText("Your City ");
}
}
@Override
public void onResume() {
super.onResume();
final SharedPreferences unitpreference = PreferenceManager.getDefaultSharedPreferences(this);
final String unitstring = unitpreference.getString("unit_type", "");
final int unit = Integer.parseInt(unitstring);
final SharedPreferences citypreference = PreferenceManager.getDefaultSharedPreferences(this);
final String citystring = citypreference.getString("example_list", "");
int city = Integer.parseInt(citystring);
final SharedPreferences fuelpreference = PreferenceManager.getDefaultSharedPreferences(this);
final String fuelstring = fuelpreference.getString("fuel_type", "");
int fuel = Integer.parseInt(fuelstring);
if (unit==1)
{
TextView kms1 = (TextView) findViewById(R.id.textView7);
kms1.setText("kms.");
TextView kml = (TextView) findViewById(R.id.textView8);
kml.setText("km/lt");
TextView kms2 = (TextView) findViewById(R.id.textView9);
kms2.setText("kms.");
TextView rs = (TextView) findViewById(R.id.textView10);
rs.setText("Rs.");
}
else
{
TextView kms1 = (TextView) findViewById(R.id.textView7);
kms1.setText("mi.");
TextView kml = (TextView) findViewById(R.id.textView8);
kml.setText("mi/ga");
TextView kms2 = (TextView) findViewById(R.id.textView9);
kms2.setText("mi.");
TextView rs = (TextView) findViewById(R.id.textView10);
rs.setText("$");
}
clickbutton();
changecityname();
changeusername();
h = new Handler()
{
public void handleMessage(Message msg)
{
super.handleMessage(msg);
switch (msg.what)
{
case 0:
finish();
break;
}
}
};
}
@Override
protected void onPause() {
super.onPause();
final SharedPreferences unitpreference = getSharedPreferences("unit_type",MODE_PRIVATE);
SharedPreferences.Editor uniteditor = unitpreference.edit();
uniteditor.commit();
}
public void clickbutton()
{
final SharedPreferences unitpreference = PreferenceManager.getDefaultSharedPreferences(this);
final String unitstring = unitpreference.getString("unit_type", "");
final int unit = Integer.parseInt(unitstring);
final SharedPreferences citypreference = PreferenceManager.getDefaultSharedPreferences(this);
final String citystring = citypreference.getString("example_list", "");
int city = Integer.parseInt(citystring);
final SharedPreferences fuelpreference = PreferenceManager.getDefaultSharedPreferences(this);
final String fuelstring = fuelpreference.getString("fuel_type", "");
int fuel = Integer.parseInt(fuelstring);
SharedPreferences petrolPricesetting = getSharedPreferences("PREFS_NAME", 0);
SharedPreferences dieselPricesetting = getSharedPreferences("PREFS_NAME", 0);
float citypetrolprice =petrolPricesetting.getFloat("petrolprice", 70.0f);
float citydieselprice =dieselPricesetting.getFloat("dieselprice", 60.0f);
final double price;
if (fuel==1)
{
if (city==1)
{
price=69.19;
}
else if (city==2)
{
price=69.59;
}
else if (city==3)
{
price=76.18;
}
else
{
price=citypetrolprice;
}
}
else
{
if (city==1)
{
price=47.24;
}
else if (city==2)
{
price=49.42;
}
else if (city==3)
{
price=47.56;
}
else
{
price=citydieselprice;
}
}
Button livecost = (Button) findViewById(R.id.button3);
livecost.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
Intent startlive = new Intent(CalculatorActivity.this,Live.class);
CalculatorActivity.this.startActivity(startlive);
}
});
Button calculatemileage = (Button) findViewById(R.id.button1);
calculatemileage.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
EditText distancetravelled= (EditText) findViewById(R.id.editText1);
EditText refillingcost= (EditText) findViewById(R.id.editText2);
if (distancetravelled.length()==0 || refillingcost.length()==0 )
{
Log.v(TAG, "Setting has been changed!");
Toast.makeText(getApplicationContext(), "Please fill both the distance travelled and the cost!", Toast.LENGTH_SHORT).show();
}
else
{
String stringdistancetravelled=distancetravelled.getText().toString();
String stringrefillingcost=refillingcost.getText().toString();
Log.v(TAG, "Setting has been changed!");
float floatdistancetravelled =Float.valueOf(stringdistancetravelled);
float floatrefillingcost =Float.valueOf(stringrefillingcost);
double mileageanswer = (floatdistancetravelled/floatrefillingcost)*price;
final float floatmileageanswer = (float) mileageanswer;
double mileageanswerroundoff = Math.round(floatmileageanswer*100.0)/100.0;
double mileageanswerimperial = mileageanswer*0.621371192;
final float floatmileageanswerimperial = (float) mileageanswerimperial;
double mileageanswerimperialroundoff = Math.round(floatmileageanswerimperial*100.0)/100.0;
if (unit==1)
{
Toast.makeText(getApplicationContext(), mileageanswerroundoff+" km/l", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(), mileageanswerimperialroundoff+" mi/ga", Toast.LENGTH_LONG).show();
}
}
}});
Button calculatecost= (Button) findViewById(R.id.button2);
calculatecost.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
EditText mileage= (EditText) findViewById(R.id.editText3);
EditText distance= (EditText) findViewById(R.id.editText4);
if (mileage.getText().length()==0 || distance.getText().length()==0 )
{
Toast.makeText(getApplicationContext(), "Please fill both the distance to travel and the mileage!", Toast.LENGTH_SHORT).show();
}
else
{
String stringmileage=mileage.getText().toString();
String stringdistance=distance.getText().toString();
float floatmileage =Float.valueOf(stringmileage);
float floatdistance =Float.valueOf(stringdistance);
double costanswer = (floatdistance)*(price/floatmileage);
final float floatcostanswer = (float) costanswer;
double costanswerroundoff = Math.round(floatcostanswer*100.0)/100.0;
double costanswerimperial = costanswer*0.621371192*0.01661;
final float floatcostanswerimperial = (float) costanswerimperial;
double costanswerimperialroundoff = Math.round(floatcostanswerimperial*100.0)/100.0;
if (unit==1)
{
Toast.makeText(getApplicationContext(), "Rs."+costanswerroundoff, Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(getApplicationContext(), "$"+costanswerimperialroundoff, Toast.LENGTH_LONG).show();
}
}
}});
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.activity_calculator, menu);
return true;
}
public boolean onMenuItemSelected(int featureId, MenuItem item)
{
if (item.getItemId()==R.id.menu_settings)
{
Intent startsettings = new Intent(CalculatorActivity.this,SettingsActivity.class);
CalculatorActivity.this.startActivity(startsettings);
}
else
{
Intent startlogin = new Intent(CalculatorActivity.this,Login.class);
CalculatorActivity.this.startActivity(startlogin);
CheckBox keeplog = (CheckBox) findViewById(R.id.checkBox1);
boolean isChecked = false;
SharedPreferences settings = getSharedPreferences("PREFS_NAME", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("isChecked", isChecked);
editor.commit();
finish();
}
return true;
}
@Override
public void onLocationChanged(Location location)
{
}
@Override
public void onProviderDisabled(String arg0)
{
}
@Override
public void onProviderEnabled(String arg0)
{
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2)
{
}
}
布局文件：
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginLeft="24dp"
android:layout_marginTop="32dp"
android:text="Distance: "
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/white" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView2"
android:layout_marginTop="39dp"
android:text="Cost:"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/white" />
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView3"
android:layout_alignBottom="@+id/textView3"
android:layout_alignLeft="@+id/editText1"
android:ems="10"
android:inputType="numberDecimal"
android:width="50dp" />
<TextView
android:id="@+id/textView10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/editText2"
android:layout_toLeftOf="@+id/editText2"
android:text="Rs."
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@android:color/white" />
<TextView
android:id="@+id/textView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView6"
android:layout_toRightOf="@+id/editText4"
android:text="kms."
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@android:color/white" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_alignTop="@+id/textView2"
android:ems="10"
android:height="10dp"
android:inputType="numberDecimal"
android:maxHeight="10dp"
android:width="50dp" />
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/editText1"
android:layout_alignBottom="@+id/editText1"
android:layout_toRightOf="@+id/editText1"
android:text="kms."
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@android:color/white" />
<EditText
android:id="@+id/editText3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView5"
android:layout_alignBottom="@+id/textView5"
android:layout_toRightOf="@+id/textView10"
android:ems="10"
android:inputType="numberDecimal"
android:width="50dp" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="26dp"
android:text="Distance Cost Calculator"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@android:color/white"
android:textStyle="bold" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="36dp"
android:text="Mileage Calculator"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@android:color/white"
android:textStyle="bold" />
<EditText
android:id="@+id/editText4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView6"
android:layout_alignBottom="@+id/textView6"
android:layout_toLeftOf="@+id/textView7"
android:ems="10"
android:inputType="numberDecimal"
android:width="50dp" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView3"
android:layout_below="@+id/textView4"
android:layout_marginTop="32dp"
android:text="Distance: "
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/white" />
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView6"
android:layout_below="@+id/editText4"
android:layout_marginTop="34dp"
android:text="Mileage: "
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/white" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button2"
android:layout_alignBottom="@+id/button2"
android:layout_alignRight="@+id/textView8"
android:background="@drawable/btn_normal"
android:paddingBottom="12dp"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="12dp"
android:text="Live Cost"
android:textColor="@android:color/white" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText3"
android:layout_marginTop="18dp"
android:layout_toLeftOf="@+id/button3"
android:background="@drawable/btn_normal"
android:paddingBottom="12dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:paddingTop="12dp"
android:text="Calculate Cost"
android:textColor="@android:color/white" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText2"
android:layout_centerHorizontal="true"
android:layout_marginTop="17dp"
android:background="@drawable/btn_normal"
android:paddingBottom="12dp"
android:paddingLeft="55dp"
android:paddingRight="55dp"
android:paddingTop="12dp"
android:text="Calculate Mileage"
android:textColor="@android:color/white" />
<TextView
android:id="@+id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/editText3"
android:layout_alignBottom="@+id/editText3"
android:layout_alignLeft="@+id/textView9"
android:text="km/lt"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@android:color/white" />
<TextView
android:id="@+id/textView11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:paddingBottom="5dp"
android:paddingLeft="5dp"
android:text="Logged in as" />
<TextView
android:id="@+id/textView12"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:paddingBottom="5dp"
android:text="City"
android:textAppearance="?android:attr/textAppearanceSmall" />
显现：
Changing the theme in Manifest has no effect, I have tried the themes which run with other successful activities!
日志：
08-01 10:38:14.374: E/Trace(14994): error opening trace file: No such file or directory (2)
08-01 10:38:14.390: V/ActivityThread(14994): com.basic.mileagecalculatorwithsettings white listed for hwui
08-01 10:38:14.452: I/System.out(14994): Sending WAIT chunk
08-01 10:38:14.452: W/ActivityThread(14994): Application com.basic.mileagecalculatorwithsettings is waiting for the debugger on port 8100...
08-01 10:38:14.499: I/dalvikvm(14994): Debugger is active
08-01 10:38:14.655: I/System.out(14994): Debugger has connected
08-01 10:38:14.655: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:14.858: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:15.061: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:15.257: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:15.460: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:15.663: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:15.858: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:16.061: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:16.265: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:16.460: I/System.out(14994): waiting for debugger to settle...
08-01 10:38:16.663: I/System.out(14994): debugger has settled (1366)
08-01 10:38:29.194: D/AndroidRuntime(14994): Shutting down VM
08-01 10:38:29.194: W/dalvikvm(14994): threadid=1: thread exiting with uncaught exception (group=0x40aa0440)
08-01 10:38:29.257: E/AndroidRuntime(14994): FATAL EXCEPTION: main
08-01 10:38:29.257: E/AndroidRuntime(14994): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.basic.mileagecalculatorwithsettings/com.basic.mileagecalculatorwithsettings.CalculatorActivity}: java.lang.NumberFormatException: Invalid int: ""
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2187)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2212)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.ActivityThread.access$600(ActivityThread.java:144)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.os.Handler.dispatchMessage(Handler.java:99)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.os.Looper.loop(Looper.java:137)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.ActivityThread.main(ActivityThread.java:4966)
08-01 10:38:29.257: E/AndroidRuntime(14994): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 10:38:29.257: E/AndroidRuntime(14994): at java.lang.reflect.Method.invoke(Method.java:511)
08-01 10:38:29.257: E/AndroidRuntime(14994): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
08-01 10:38:29.257: E/AndroidRuntime(14994): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
08-01 10:38:29.257: E/AndroidRuntime(14994): at dalvik.system.NativeStart.main(Native Method)
08-01 10:38:29.257: E/AndroidRuntime(14994): Caused by: java.lang.NumberFormatException: Invalid int: ""
08-01 10:38:29.257: E/AndroidRuntime(14994): at java.lang.Integer.invalidInt(Integer.java:138)
08-01 10:38:29.257: E/AndroidRuntime(14994): at java.lang.Integer.parseInt(Integer.java:359)
08-01 10:38:29.257: E/AndroidRuntime(14994): at java.lang.Integer.parseInt(Integer.java:332)
08-01 10:38:29.257: E/AndroidRuntime(14994): at com.basic.mileagecalculatorwithsettings.CalculatorActivity.onCreate(CalculatorActivity.java:55)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.Activity.performCreate(Activity.java:5008)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
08-01 10:38:29.257: E/AndroidRuntime(14994): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2141)
08-01 10:38:29.257: E/AndroidRuntime(14994): ... 11 more
我认为的错误是 Invalid Int:""。可能是什么原因？