这是我的代码
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
RadioButton r1, r2;
Button exit, submit, report,settings,about;
EditText amount;
double Liters = 0;
double ppetrol;
double pdiesel;
double damount;
String date, time, dbamt;
String price_petrol;
String price_diesel;
DatabaseHandler db;
// XML parsing data types
// All static variables
static final String URL = "http://pixelexis.host56.com/data.xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node(to check every nodes)
static final String PETROL = "petrol";
static final String DIESEL = "diesel";
AlertDialog.Builder alert;
TextView input1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
alert = new AlertDialog.Builder(this);
input1 = new TextView(this);
r1 = (RadioButton)findViewById(R.id.radiopetrol);
r2 = (RadioButton)findViewById(R.id.radiodiesel);
exit = (Button)findViewById(R.id.exitbutton);
submit = (Button)findViewById(R.id.submit);
amount = (EditText)findViewById(R.id.amt);
report = (Button)findViewById(R.id.repobutton);
settings = (Button)findViewById(R.id.setbutton);
about = (Button)findViewById(R.id.abtbutton);
final DatabaseHandler db = new DatabaseHandler(this);
final Calendar c = Calendar.getInstance();
int mYear = c.get(Calendar.YEAR);
int mMonth = c.get(Calendar.MONTH);
int mDay = c.get(Calendar.DAY_OF_MONTH);
int mHour = c.get(Calendar.HOUR_OF_DAY);
int mMinute = c.get(Calendar.MINUTE);
TextView t = (TextView)findViewById(R.id.time);
TextView d = (TextView)findViewById(R.id.date);
d.setText(" Date:" + mDay+" / "+mMonth+1 + " / "+mYear+" ");
t.setText("Time:" + mHour+" : "+mMinute);
date = d.getText().toString();
time = t.getText().toString();
// XML to HashMap
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
// looping through all item nodes <item>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(PETROL, parser.getValue(e, PETROL));
map.put(DIESEL, parser.getValue(e, DIESEL));
// adding HashList to ArrayList
menuItems.add(map);
}
menuItems.trimToSize();
price_petrol = menuItems.get(0).values().toString();
price_diesel = menuItems.get(1).values().toString();
String regx = ",[] ";
char[] ca = regx.toCharArray();
for(char c1 : ca)
{
price_petrol = price_petrol.replace(""+c1, "");
price_diesel = price_diesel.replace(""+c1, "");
}
System.out.println("Price of petrol = " + price_petrol);
System.out.println("Price of diesel = " + price_diesel);
ppetrol = Double.parseDouble(price_petrol);
pdiesel = Double.parseDouble(price_diesel);
// int count = db.getValuesCount();
/**
* DATABASE OPERATIONS
* */
// Inserting values
Log.d("Insert: ", "Inserting ..");
// db.addValues(new Values(date, time, price_petrol,dbamt ));
exit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
System.exit(0);
// Force stopping all process and shutting down application
}
});
about.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "App by Junior Hacker...",
Toast.LENGTH_LONG).show();
}
});
settings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
alert.setTitle("Current fuel price");
alert.setView(input1);
input1.setTextColor(Color.parseColor("#FFFFFF"));
input1.setText("Petrol : "+price_petrol+ " Diesel : "+price_diesel);
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int whichButton)
{
dialog.dismiss();
}
});
alert.show();
}
});
report.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(), ListviewActivity.class);
startActivity(i);
}
});
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dbamt = amount.getText().toString();
if(amount.getText().toString() != null && ! amount.getText().toString().equalsIgnoreCase(""))
{
if(r1.isChecked())
{
damount = Double.parseDouble(amount.getText().toString());
Liters = damount/ppetrol;
db.addValues(new Values(date, time, price_petrol,dbamt ));
Toast.makeText(getApplicationContext(), "Data Submitted Successfully",
Toast.LENGTH_LONG).show();
amount.setText("");
// Reading all values
Log.d("Reading: ", "Reading all contacts..");
List<Values> value = db.getAllValues();
for (Values val : value) {
String log = "Id: "+val.getID()+" ,Date: " + val.getDate() + " ,Time: " + val.getTime() + ",Price: " + val.getPrice() + ",Amount: " + val.getAmount();
// Writing values to log
Log.d("The Log-> ", log);
}
}
else if(r2.isChecked())
{
damount = Double.parseDouble(amount.getText().toString());
Liters = damount/pdiesel;
Toast.makeText(getApplicationContext(), "Data Submitted Successfully",
Toast.LENGTH_LONG).show();
db.addValues(new Values(date, time, price_diesel,dbamt ));
// Reading all values
Log.d("Reading: ", "Reading all contacts..");
List<Values> value = db.getAllValues();
for (Values val : value) {
String log = "Id: "+val.getID()+" ,Date: " + val.getDate() + " ,Time: " + val.getTime() + ",Price: " + val.getPrice() + ",Amount: " + val.getAmount();
// Writing values to log
Log.d("The Log-> ", log);
}
}
System.out.println(Liters);
}
else
{
Toast.makeText(getApplicationContext(), "Invalid amount!",
Toast.LENGTH_LONG).show();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}
第一次点击时会出现对话框，下一次点击会以FatalException
这是我的logcat
01-31 15:57:55.692: D/AndroidRuntime(272): Shutting down VM
01-31 15:57:55.692: W/dalvikvm(272): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
01-31 15:57:55.762: D/dalvikvm(272): GC_FOR_MALLOC freed 2922 objects / 185432 bytes in 61ms
01-31 15:57:55.772: E/AndroidRuntime(272): FATAL EXCEPTION: main
01-31 15:57:55.772: E/AndroidRuntime(272): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
01-31 15:57:55.772: E/AndroidRuntime(272): at android.view.ViewGroup.addViewInner(ViewGroup.java:1970)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.view.ViewGroup.addView(ViewGroup.java:1865)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.view.ViewGroup.addView(ViewGroup.java:1845)
01-31 15:57:55.772: E/AndroidRuntime(272): at com.android.internal.app.AlertController.setupView(AlertController.java:364)
01-31 15:57:55.772: E/AndroidRuntime(272): at com.android.internal.app.AlertController.installContent(AlertController.java:205)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.app.AlertDialog.onCreate(AlertDialog.java:251)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.app.Dialog.dispatchOnCreate(Dialog.java:307)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.app.Dialog.show(Dialog.java:225)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
01-31 15:57:55.772: E/AndroidRuntime(272): at com.aabasoft.fuelcalc.MainActivity$3.onClick(MainActivity.java:195)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.view.View.performClick(View.java:2408)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.view.View$PerformClick.run(View.java:8816)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.os.Handler.handleCallback(Handler.java:587)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.os.Handler.dispatchMessage(Handler.java:92)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.os.Looper.loop(Looper.java:123)
01-31 15:57:55.772: E/AndroidRuntime(272): at android.app.ActivityThread.main(ActivityThread.java:4627)
01-31 15:57:55.772: E/AndroidRuntime(272): at java.lang.reflect.Method.invokeNative(Native Method)
01-31 15:57:55.772: E/AndroidRuntime(272): at java.lang.reflect.Method.invoke(Method.java:521)
01-31 15:57:55.772: E/AndroidRuntime(272): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-31 15:57:55.772: E/AndroidRuntime(272): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-31 15:57:55.772: E/AndroidRuntime(272): at dalvik.system.NativeStart.main(Native Method)
这是什么问题？我还有其他项目也有同样的问题，我需要使用EditTexts接受用户的字符串，还有app停止。
答案 0 :(得分：2)
你应该在onClick本身初始化警告对话框。
settings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
alert = new AlertDialog.Builder(this);
alert.setTitle("Current fuel price");
alert.setView(input1);
答案 1 :(得分：2)
创建一个新类，其唯一目的是重复显示对话框，然后在必要时调用它......
这是代码
public class AlertDialogManager {
public void showAlertDialog(Context context, String title, String message,
Boolean status) {
AlertDialog alertDialog = new AlertDialog.Builder(context).create();
alert.setTitle("Current fuel price");
alert.setView(input1);
input1.setTextColor(Color.parseColor("#FFFFFF"));
input1.setText("Petrol : "+price_petrol+ " Diesel : "+price_diesel);
if(status != null)
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.show();
}
}
答案 2 :(得分：1)
我认为您的变量：alert和input1未初始化。 你能复制错误信息吗？你可以读取行号来找出错误，好的。
答案 3 :(得分：1)
每次解除后都必须重新初始化它。在onClickListener旁边初始化你的警告对话框。