Android apiDemo 学习——对话框AlertDialogSamples
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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. */ @Overrideprotected 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。
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