在一个Activity中使用多个Dialog

本文介绍如何在Android应用中通过重写Activity.onCreateDialog()方法创建并管理多个Dialog,包括创建退出、列表、单选和多选Dialog,并在Activity中统一显示。

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[size=medium]
Android Dev-Guide 推荐重写Activity.onCreateDialog()方法来创建Dialog,这样Dialog就归属于这个Activity了。使用方法是这样的,Activity.showDialog()激发Activity.onCreateDialog()创建Dialog,然后显示之,便于多个Dialog的统一管理。注意,以后再用Activity.showDialog()显示同一个Dialog时,则不会调用Activity.onCreateDialog(),而是调用Activity.onPrepareDialog(),使用上一次显示Dialog时的状态。即
第一次:showDialog() -> onCreatedialog()
以后: showDialog() -> onPrepareDialog()

在示例代码中,分别用createExitDialog(),createListDialog(),createRadioDialog(),createCheckboxDialog(),创建4种Dialog,并在Activity中显示。示例代码如下:[/size]

package com.ipjmc.dialog;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

public class ShowDialogActivity extends Activity {
/** Called when the activity is first created. */
public static final String TAG = "ShowDialog";
public static final int ID_EXIT_DIALOG = 1;
public static final int ID_LIST_DIALOG = 2;
public static final int ID_RADIO_DIALOG = 3;
public static final int ID_CHECKBOX_DIALOG = 4;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

showDialog(ID_EXIT_DIALOG);
showDialog(ID_LIST_DIALOG);
showDialog(ID_RADIO_DIALOG);
showDialog(ID_CHECKBOX_DIALOG);
}

@Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
Dialog dialog = null;
switch(id) {
case ID_EXIT_DIALOG :
dialog = createExitDialog();
break;
case ID_LIST_DIALOG :
dialog = createListDialog();
break;
case ID_RADIO_DIALOG :
dialog = createRadioDialog();
break;
case ID_CHECKBOX_DIALOG :
dialog = createCheckboxDialog();
break;
default :
break;
}
if (dialog != null) {
Log.i(TAG, dialog.toString());
} else {
Log.i(TAG, "dialog = null");
}
return dialog;
}

@Override
protected void onPrepareDialog(int id, Dialog dialog) {
// TODO Auto-generated method stub
super.onPrepareDialog(id, dialog);
}

//创建简单Dialog
public Dialog createExitDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
ShowDialogActivity.this.finish();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
return builder.create();
}

//创建ListDialog
public Dialog createListDialog() {
final CharSequence[] items = {"Red", "Green", "Blue"};

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Pick a color");
builder.setItems(items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
}
});
return builder.create();
}

//创建单选Dialog
public Dialog createRadioDialog() {
final CharSequence[] items = {"Red", "Green", "Blue"};

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Pick a color");
builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int position) {
Toast.makeText(getApplicationContext(), position + " -> " + items[position], Toast.LENGTH_SHORT).show();
dialog.dismiss();
}
});
return builder.create();
}

//创建多选Dialog
public Dialog createCheckboxDialog() {
final CharSequence[] items = {"Red", "Green", "Blue"};
final boolean [] checked = new boolean [] {false, false, false};

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Pick a color");
builder.setMultiChoiceItems(items, checked, new DialogInterface.OnMultiChoiceClickListener() {

@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
// TODO Auto-generated method stub

}
});

builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
ShowDialogActivity.this.finish();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});

return builder.create();

}
}
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