您好我正在尝试创建一个应用程序，该应用程序将有一个按钮，可以从对话框中输入4个不同的玩家名称，并将输入分配给单独的文本视图。
我希望可以单击按钮，弹出对话框，输入名称，它将显示为player1，然后再次点击同一按钮并输入player2。问题是我第二次无法打开对话框。
代码：
package com.example.russianroullette;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.text.Editable;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class PlayersTab extends FragmentActivity {
int amtPlayers = 0;//number of players currently active
String name = "";//name input from Dialog Box
String player1Name = "";//actual name used for player1
String player2Name = "";//actual name used for player2
String player3Name = "";//actual name used for player3
String player4Name = "";//actual name used for player4
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.players_tab);
final TextView player1 = (TextView) findViewById(R.id.textView2);//Player1 TextView
final TextView player2 = (TextView) findViewById(R.id.textView3);//Player2 TextView
final TextView player3 = (TextView) findViewById(R.id.textView4);//Player3 TextView
final TextView player4 = (TextView) findViewById(R.id.textView5);//player4 TextView
final EditText input = new EditText(this);// Set an EditText view to get user input
final Button addPlayerButton = (Button) findViewById(R.id.add1Button);
player1.setText("P1: ");//updates the TextView with P1 name
player2.setText("P2: ");//updates the TextView with P2 name
player3.setText("P3: ");//updates the TextView with P3 name
player4.setText("P4: ");//updates the TextView with P4 name
//Creates AlertDialog
final AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Enter Player's Name");//Title of AlertDialog
alert.setView(input);//The EditText
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Editable value = input.getText();//gets the input
name = value.toString();//sets name as the user input from the Dialog Box
playerId = ("Player " + amtPlayers + ": " + name);// puts all of the variables into a simple string to be used by the TextViews
switch(amtPlayers){
case 1: player1Name = (name);
player1.setText(player1Name);
break;
case 2: player2Name = (name);//the actual name used for player2
player2.setText(player2Name);
break;
case 3: player3Name = (name);//the actual name used for player3
player3.setText(player3Name);
break;
case 4: player4Name = (name);//the actual name used for player4
player4.setText(player4Name);
break;
default: //code that asks the user which name to replace
break;
}
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
amtPlayers--;//puts the amtPlayers back 1
}
});
//Ends AlertDialog Creation
addPlayerButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Code that adds new Player.
amtPlayers++;
alert.show();
}
});
});
//Code
}
}
logcat的：
01-22 19:48:58.376: E/AndroidRuntime(1284): FATAL EXCEPTION: main
01-22 19:48:58.376: E/AndroidRuntime(1284): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.view.ViewGroup.addViewInner(ViewGroup.java:3378)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.view.ViewGroup.addView(ViewGroup.java:3249)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.view.ViewGroup.addView(ViewGroup.java:3225)
01-22 19:48:58.376: E/AndroidRuntime(1284): at com.android.internal.app.AlertController.setupView(AlertController.java:401)
01-22 19:48:58.376: E/AndroidRuntime(1284): at com.android.internal.app.AlertController.installContent(AlertController.java:241)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.app.AlertDialog.onCreate(AlertDialog.java:336)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.app.Dialog.dispatchOnCreate(Dialog.java:351)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.app.Dialog.show(Dialog.java:256)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.app.AlertDialog$Builder.show(AlertDialog.java:932)
01-22 19:48:58.376: E/AndroidRuntime(1284): at com.example.russianroullette.PlayersTab$5.onClick(PlayersTab.java:124)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.view.View.performClick(View.java:4084)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.view.View$PerformClick.run(View.java:16966)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.os.Handler.handleCallback(Handler.java:615)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.os.Handler.dispatchMessage(Handler.java:92)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.os.Looper.loop(Looper.java:137)
01-22 19:48:58.376: E/AndroidRuntime(1284): at android.app.ActivityThread.main(ActivityThread.java:4745)
01-22 19:48:58.376: E/AndroidRuntime(1284): at java.lang.reflect.Method.invokeNative(Native Method)
01-22 19:48:58.376: E/AndroidRuntime(1284): at java.lang.reflect.Method.invoke(Method.java:511)
01-22 19:48:58.376: E/AndroidRuntime(1284): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-22 19:48:58.376: E/AndroidRuntime(1284): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-22 19:48:58.376: E/AndroidRuntime(1284): at dalvik.system.NativeStart.main(Native Method)
感谢您的帮助！
编辑：我相信我必须以某种方式重新启动DialogBox？答案 0 :(得分：2)
在功能中创建alertview，并确保在创建alertview时它是一个新的。
-(void)showAlert {
final AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Enter Player's Name");//Title of AlertDialog
alert.setView(input);//The EditText
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Editable value = input.getText();//gets the input
name = value.toString();//sets name as the user input from the Dialog Box
playerId = ("Player " + amtPlayers + ": " + name);// puts all of the variables into a simple string to be used by the TextViews
switch(amtPlayers){
case 1: player1Name = (name);
player1.setText(player1Name);
break;
case 2: player2Name = (name);//the actual name used for player2
player2.setText(player2Name);
break;
case 3: player3Name = (name);//the actual name used for player3
player3.setText(player3Name);
break;
case 4: player4Name = (name);//the actual name used for player4
player4.setText(player4Name);
break;
default: //code that asks the user which name to replace
break;
}
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
amtPlayers--;//puts the amtPlayers back 1
}
});
alert.show();
}
答案 1 :(得分：0)
问题在于您的EditText已绑定到上一个对话框。
一个快速的解决方法是： 在onCreate（）之前定义Context和Builder
Context ctx;
AlertDialog.Builder alert;
在onCreate（）中初始化它们：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(...);
ctx = this.getApplicationContext();
final Button addPlayerButton = (Button) findViewById(...);
alert = new Builder(this);
// Creates AlertDialog
......
}
将addPlayerButton onClick更改为：
addPlayerButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Code that adds new Player.
showDialog();
}
});
protected void showDialog() {
input = new EditText(ctx);
alert.setView(input);
alert.show();
}
答案 2 :(得分：0)
我修改了你的代码，请试试这个。
public class PlayersTab extends FragmentActivity {
private AlertDialog.Builder alert = null;
int amtPlayers = 0;//number of players currently active
String name = "";//name input from Dialog Box
private TextView player1 ,player2,player3, player4;
String player1Name = "";//actual name used for player1
String player2Name = "";//actual name used for player2
String player3Name = "";//actual name used for player3
String player4Name = "";//actual name used for player4
private EditText input ;
private Button addPlayerButton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.players_tab);
player1 = (TextView) findViewById(R.id.textView2);//Player1 TextView
player2 = (TextView) findViewById(R.id.textView3);//Player2 TextView
player3 = (TextView) findViewById(R.id.textView4);//Player3 TextView
player4 = (TextView) findViewById(R.id.textView5);//player4 TextView
input = new EditText(this);// Set an EditText view to get user input
addPlayerButton = (Button) findViewById(R.id.add1Button);
player1.setText("P1: ");//updates the TextView with P1 name
player2.setText("P2: ");//updates the TextView with P2 name
player3.setText("P3: ");//updates the TextView with P3 name
player4.setText("P4: ");//updates the TextView with P4 name
//Ends AlertDialog Creation
addPlayerButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Code that adds new Player.
amtPlayers++;
//You should create dialog after you click, in your earlier code, it was always there.
alert = new AlertDialog.Builder(this);
alert.setTitle("Enter Player's Name");//Title of AlertDialog
alert.setView(input);//The EditText
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
Editable value = input.getText();//gets the input
name = value.toString();//sets name as the user input from the Dialog Box
playerId = ("Player " + amtPlayers + ": " + name);// puts all of the variables into a simple string to be used by the TextViews
switch(amtPlayers){
case 1: player1Name = (name);
player1.setText(player1Name);
break;
case 2: player2Name = (name);//the actual name used for player2
player2.setText(player2Name);
break;
case 3: player3Name = (name);//the actual name used for player3
player3.setText(player3Name);
break;
case 4: player4Name = (name);//the actual name used for player4
player4.setText(player4Name);
break;
default: //code that asks the user which name to replace
break;
}
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
amtPlayers--;//puts the amtPlayers back 1
}
});
alert.show();
}
});
我仍然建议您使用DialogFragment，这是使用所有类型对话框的正确方法。
例如，您可以参考此tutorial。