注意：该代码只适用于当次简单调用对话框，当遇到用到bundle多次调用或者传递信息是需要借助onPrepareDialog，但是这样的方法已经不被推荐。
该activity代码里面实现了多种常用的对话框，android的对话框常见的可以有两种实现方式：
AlertDialog方式
Dialog样式的activity方式
该代码实现的是AlertDialog，生命周期存在于调用的activity。
在开发中，常见的对话框包括几个部分，标题，正文和按钮，在实现对话框时候，可以很容易调用api实现。
new AlertDialog.Builder(AlertDialogSamples.this)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_two_buttons_title)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Cancel so do some stuff */
}
})
.show（）;
注意：以上方法虽然可以实现对话框，但是调用show（）方法会有可能产生内存泄漏，及当其他进程销毁该activity时候，详细内容会在后面介绍。
因此我们看到demo中使用的是在onCreateDialog(int id)中生成，而使用showDialog(int id)方法调用。
以下是程序代码，其中set***开头的方法是设置对话框样式的方法，很容易理解，不赘述。
public class AlertDialogSamples extends Activity {
private static final int DIALOG_YES_NO_MESSAGE = 1;
private static final int DIALOG_YES_NO_LONG_MESSAGE = 2;
private static final int DIALOG_LIST = 3;
private static final int DIALOG_PROGRESS = 4;
private static final int DIALOG_SINGLE_CHOICE = 5;
private static final int DIALOG_MULTIPLE_CHOICE = 6;
private static final int DIALOG_TEXT_ENTRY = 7;
private static final int DIALOG_MULTIPLE_CHOICE_CURSOR = 8;
private static final int DIALOG_YES_NO_ULTRA_LONG_MESSAGE = 9;
private static final int DIALOG_YES_NO_OLD_SCHOOL_MESSAGE = 10;
private static final int DIALOG_YES_NO_HOLO_LIGHT_MESSAGE = 11;
private static final int MAX_PROGRESS = 100;
private ProgressDialog mProgressDialog;
private int mProgress;
private Handler mProgressHandler;
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DIALOG_YES_NO_MESSAGE:
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_two_buttons_title)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Cancel so do some stuff */
}
})
.create();
case DIALOG_YES_NO_OLD_SCHOOL_MESSAGE:
return new AlertDialog.Builder(AlertDialogSamples.this, AlertDialog.THEME_TRADITIONAL)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_two_buttons_title)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
})
.create();
case DIALOG_YES_NO_HOLO_LIGHT_MESSAGE:
return new AlertDialog.Builder(AlertDialogSamples.this, AlertDialog.THEME_HOLO_LIGHT)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_two_buttons_title)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
})
.create();
case DIALOG_YES_NO_LONG_MESSAGE:
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_two_buttons_msg)
.setMessage(R.string.alert_dialog_two_buttons2_msg)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.setNeutralButton(R.string.alert_dialog_something, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Something so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Cancel so do some stuff */
}
})
.create();
case DIALOG_YES_NO_ULTRA_LONG_MESSAGE:
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_two_buttons_msg)
.setMessage(R.string.alert_dialog_two_buttons2ultra_msg)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.setNeutralButton(R.string.alert_dialog_something, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Something so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Cancel so do some stuff */
}
})
.create();
case DIALOG_LIST:
return new AlertDialog.Builder(AlertDialogSamples.this)
.setTitle(R.string.select_dialog)
.setItems(R.array.select_dialog_items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
/* User clicked so do some stuff */
String[] items = getResources().getStringArray(R.array.select_dialog_items);
new AlertDialog.Builder(AlertDialogSamples.this)
.setMessage("You selected: " + which + " , " + items[which])
.show();
}
})
.create();
case DIALOG_PROGRESS:
mProgressDialog = new ProgressDialog(AlertDialogSamples.this);
mProgressDialog.setIconAttribute(android.R.attr.alertDialogIcon);
mProgressDialog.setTitle(R.string.select_dialog);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mProgressDialog.setMax(MAX_PROGRESS);
mProgressDialog.setButton(DialogInterface.BUTTON_POSITIVE,
getText(R.string.alert_dialog_hide), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Yes so do some stuff */
}
});
mProgressDialog.setButton(DialogInterface.BUTTON_NEGATIVE,
getText(R.string.alert_dialog_cancel), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked No so do some stuff */
}
});
return mProgressDialog;
case DIALOG_SINGLE_CHOICE:
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_single_choice)
.setSingleChoiceItems(R.array.select_dialog_items2, 0, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked on a radio button do some stuff */
}
})
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Yes so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked No so do some stuff */
}
})
.create();
case DIALOG_MULTIPLE_CHOICE:
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIcon(R.drawable.ic_popup_reminder)
.setTitle(R.string.alert_dialog_multi_choice)
.setMultiChoiceItems(R.array.select_dialog_items3,
new boolean[]{false, true, false, true, false, false, false},
new DialogInterface.OnMultiChoiceClickListener() {
public void onClick(DialogInterface dialog, int whichButton,
boolean isChecked) {
/* User clicked on a check box do some stuff */
}
})
.setPositiveButton(R.string.alert_dialog_ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Yes so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked No so do some stuff */
}
})
.create();
case DIALOG_MULTIPLE_CHOICE_CURSOR:
String[] projection = new String[] {
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME,
ContactsContract.Contacts.SEND_TO_VOICEMAIL
};
Cursor cursor = managedQuery(ContactsContract.Contacts.CONTENT_URI,
projection, null, null, null);
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIcon(R.drawable.ic_popup_reminder)
.setTitle(R.string.alert_dialog_multi_choice_cursor)
.setMultiChoiceItems(cursor,
ContactsContract.Contacts.SEND_TO_VOICEMAIL,
ContactsContract.Contacts.DISPLAY_NAME,
new DialogInterface.OnMultiChoiceClickListener() {
public void onClick(DialogInterface dialog, int whichButton,
boolean isChecked) {
Toast.makeText(AlertDialogSamples.this,
"Readonly Demo Only - Data will not be updated",
Toast.LENGTH_SHORT).show();
}
})
.create();
case DIALOG_TEXT_ENTRY:
// This example shows how to add a custom layout to an AlertDialog
LayoutInflater factory = LayoutInflater.from(this);
final View textEntryView = factory.inflate(R.layout.alert_dialog_text_entry, null);
return new AlertDialog.Builder(AlertDialogSamples.this)
.setIconAttribute(android.R.attr.alertDialogIcon)
.setTitle(R.string.alert_dialog_text_entry)
.setView(textEntryView)
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked cancel so do some stuff */
}
})
.create();
}
return null;
}
/**
* Initialization of the Activity after it is first created. Must at least
* call {@link android.app.Activity#setContentView(int)} to
* describe what is to be displayed in the screen.
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.alert_dialog);
/* Display a text message with yes/no buttons and handle each message as well as the cancel action */
Button twoButtonsTitle = (Button) findViewById(R.id.two_buttons);
twoButtonsTitle.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_YES_NO_MESSAGE);
}
});
/* Display a long text message with yes/no buttons and handle each message as well as the cancel action */
Button twoButtons2Title = (Button) findViewById(R.id.two_buttons2);
twoButtons2Title.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_YES_NO_LONG_MESSAGE);
}
});
/* Display an ultra long text message with yes/no buttons and handle each message as well as the cancel action */
Button twoButtons2UltraTitle = (Button) findViewById(R.id.two_buttons2ultra);
twoButtons2UltraTitle.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_YES_NO_ULTRA_LONG_MESSAGE);
}
});
/* Display a list of items */
Button selectButton = (Button) findViewById(R.id.select_button);
selectButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_LIST);
}
});
/* Display a custom progress bar */
Button progressButton = (Button) findViewById(R.id.progress_button);
progressButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_PROGRESS);
mProgress = 0;
mProgressDialog.setProgress(0);
mProgressHandler.sendEmptyMessage(0);
}
});
/* Display a radio button group */
Button radioButton = (Button) findViewById(R.id.radio_button);
radioButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_SINGLE_CHOICE);
}
});
/* Display a list of checkboxes */
Button checkBox = (Button) findViewById(R.id.checkbox_button);
checkBox.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_MULTIPLE_CHOICE);
}
});
/* Display a list of checkboxes, backed by a cursor */
Button checkBox2 = (Button) findViewById(R.id.checkbox_button2);
checkBox2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_MULTIPLE_CHOICE_CURSOR);
}
});
/* Display a text entry dialog */
Button textEntry = (Button) findViewById(R.id.text_entry_button);
textEntry.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_TEXT_ENTRY);
}
});
/* Two points, in the traditional theme */
Button twoButtonsOldSchoolTitle = (Button) findViewById(R.id.two_buttons_old_school);
twoButtonsOldSchoolTitle.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_YES_NO_OLD_SCHOOL_MESSAGE);
}
});
/* Two points, in the light holographic theme */
Button twoButtonsHoloLightTitle = (Button) findViewById(R.id.two_buttons_holo_light);
twoButtonsHoloLightTitle.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog(DIALOG_YES_NO_HOLO_LIGHT_MESSAGE);
}
});
mProgressHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (mProgress >= MAX_PROGRESS) {
mProgressDialog.dismiss();
} else {
mProgress++;
mProgressDialog.incrementProgressBy(1);
mProgressHandler.sendEmptyMessageDelayed(0, 100);
}
}
};
}
}开发者可以使用该代码依次看一看每个对话框是什么样子的
该代码实现的只是简单的对话框，对于多次调用或者更新信息等动态信息的对话框是有问题的，因为，他的回调方法只能调用一次，以后多次调用时的数据都是第一次的，不适用于Bundle传递数据的使用场景。