1.写在前面
Android提供了丰富的 Dialog 函数,本文介绍最常用的8种对话框的使用方法,包括普通(包含提示消息和按钮)、列表、单选、多选、等待、进度条、编辑、自定义等多种形式,将在第2部分介绍。
有时,我们希望在对话框创建或关闭时完成一些特定的功能,这需要复写
Dialog的create()、show()、dismiss()等方法,将在第3部分介绍。
2.代码示例
2.1 普通Dialog(图1与图2)
2个按钮
public class MainActivity extends Activity {
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button buttonNormal = (Button) findViewById(R.id.button_normal);
buttonNormal.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {
showNormalDialog();
}
}
);
}
private void showNormalDialog(){
/* @setIcon 设置对话框图标 * @setTitle 设置对话框标题 * @setMessage 设置对话框消息提示 * setXXX方法返回Dialog对象,因此可以链式设置属性 */ final AlertDialog.Builder normalDialog = new AlertDialog.Builder(MainActivity.this);
normalDialog.setIcon(R.drawable.icon_dialog);
normalDialog.setTitle("我是一个普通Dialog") normalDialog.setMessage("你要点击哪一个按钮呢?");
normalDialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
//...To-do }
}
);
normalDialog.setNegativeButton("关闭", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
//...To-do }
}
);
// 显示 normalDialog.show();
}
}
3个按钮
/* @setNeutralButton 设置中间的按钮 * 若只需一个按钮,仅设置 setPositiveButton 即可 */private void showMultiBtnDialog(){
AlertDialog.Builder normalDialog = new AlertDialog.Builder(MainActivity.this);
normalDialog.setIcon(R.drawable.icon_dialog);
normalDialog.setTitle("我是一个普通Dialog").setMessage("你要点击哪一个按钮呢?");
normalDialog.setPositiveButton("按钮1", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
// ...To-do }
}
);
normalDialog.setNeutralButton("按钮2", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
// ...To-do }
}
);
normalDialog.setNegativeButton("按钮3", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
// ...To-do }
}
);
// 创建实例并显示 normalDialog.show();
}
2.2 列表Dialog(图3)
private void showListDialog() {
final String[] items = {
"我是1","我是2","我是3","我是4" }
;
AlertDialog.Builder listDialog = new AlertDialog.Builder(MainActivity.this);
listDialog.setTitle("我是一个列表Dialog");
listDialog.setItems(items, new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
// which 下标从0开始 // ...To-do Toast.makeText(MainActivity.this, "你点击了" + items[which], Toast.LENGTH_SHORT).show();
}
}
);
listDialog.show();
}
2.3 单选Dialog(图4)
int yourChoice;
private void showSingleChoiceDialog(){
final String[] items = {
"我是1","我是2","我是3","我是4" }
;
yourChoice = -1;
AlertDialog.Builder singleChoiceDialog = new AlertDialog.Builder(MainActivity.this);
singleChoiceDialog.setTitle("我是一个单选Dialog");
// 第二个参数是默认选项,此处设置为0 singleChoiceDialog.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
yourChoice = which;
}
}
);
singleChoiceDialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
if (yourChoice != -1) {
Toast.makeText(MainActivity.this, "你选择了" + items[yourChoice], Toast.LENGTH_SHORT).show();
}
}
}
);
singleChoiceDialog.show();
}
2.4 多选Dialog(图5)
ArrayList<Integer> yourChoices = new ArrayList<>();
private void showMultiChoiceDialog() {
final String[] items = {
"我是1","我是2","我是3","我是4" }
;
// 设置默认选中的选项,全为false默认均未选中 final boolean initChoiceSets[]={
false,false,false,false}
;
yourChoices.clear();
AlertDialog.Builder multiChoiceDialog = new AlertDialog.Builder(MainActivity.this);
multiChoiceDialog.setTitle("我是一个多选Dialog");
multiChoiceDialog.setMultiChoiceItems(items, initChoiceSets, new DialogInterface.OnMultiChoiceClickListener() {
@Override public void onClick(DialogInterface dialog, int which, boolean isChecked) {
if (isChecked) {
yourChoices.add(which);
}
else {
yourChoices.remove(which);
}
}
}
);
multiChoiceDialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
int size = yourChoices.size();
String str = "";
for (int i = 0;
i < size;
i++) {
str += items[yourChoices.get(i)] + " ";
}
Toast.makeText(MainActivity.this, "你选中了" + str, Toast.LENGTH_SHORT).show();
}
}
);
multiChoiceDialog.show();
}
2.5 等待Dialog(图6)
private void showWaitingDialog() {
/* 等待Dialog具有屏蔽其他控件的交互能力 * @setCancelable 为使屏幕不可点击,设置为不可取消(false) * 下载等事件完成后,主动调用函数关闭该Dialog */ ProgressDialog waitingDialog= new ProgressDialog(MainActivity.this);
waitingDialog.setTitle("我是一个等待Dialog");
waitingDialog.setMessage("等待中...");
waitingDialog.setIndeterminate(true);
waitingDialog.setCancelable(false);
waitingDialog.show();
}
2.6 进度条Dialog(图7)
private void showProgressDialog() {
/* @setProgress 设置初始进度 * @setProgressStyle 设置样式(水平进度条) * @setMax 设置进度最大值 */ final int MAX_PROGRESS = 100;
final ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setProgress(0);
progressDialog.setTitle("我是一个进度条Dialog");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setMax(MAX_PROGRESS);
progressDialog.show();
/* 模拟进度增加的过程 * 新开一个线程,每个100ms,进度增加1 */ new Thread(new Runnable() {
@Override public void run() {
int progress= 0;
while (progress < MAX_PROGRESS){
try {
Thread.sleep(100);
progress++;
progressDialog.setProgress(progress);
}
catch (InterruptedException e){
e.printStackTrace();
}
}
// 进度达到最大值后,窗口消失 progressDialog.cancel();
}
}
).start();
}
2.7 编辑Dialog(图8)
private void showInputDialog() {
/*@setView 装入一个EditView */ final EditText editText = new EditText(MainActivity.this);
AlertDialog.Builder inputDialog = new AlertDialog.Builder(MainActivity.this);
inputDialog.setTitle("我是一个输入Dialog").setView(editText);
inputDialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, editText.getText().toString(), Toast.LENGTH_SHORT).show();
}
}
).show();
}
2.8 自定义Dialog(图9)
<!-- res/layout/dialog_customize.xml--><!-- 自定义View --><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <EditText android:id="@+id/edit_text" android:layout_width="match_parent" android:layout_height="wrap_content" /></LinearLayout>
private void showCustomizeDialog() {
/* @setView 装入自定义View ==> R.layout.dialog_customize * 由于dialog_customize.xml只放置了一个EditView,因此和图8一样 * dialog_customize.xml可自定义更复杂的View */ AlertDialog.Builder customizeDialog = new AlertDialog.Builder(MainActivity.this);
final View dialogView = LayoutInflater.from(MainActivity.this) .inflate(R.layout.dialog_customize,null);
customizeDialog.setTitle("我是一个自定义Dialog");
customizeDialog.setView(dialogView);
customizeDialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
// 获取EditView中的输入内容 EditText edit_text = (EditText) dialogView.findViewById(R.id.edit_text);
Toast.makeText(MainActivity.this, edit_text.getText().toString(), Toast.LENGTH_SHORT).show();
}
}
);
customizeDialog.show();
}
3.复写回调函数
/* 复写Builder的create和show函数,可以在Dialog显示前实现必要设置 * 例如初始化列表、默认选项等 * @create 第一次创建时调用 * @show 每次显示时调用 */private void showListDialog() {
final String[] items = {
"我是1","我是2","我是3","我是4" }
;
AlertDialog.Builder listDialog = new AlertDialog.Builder(MainActivity.this){
@Override public AlertDialog create() {
items[0] = "我是No.1";
return super.create();
}
@Override public AlertDialog show() {
items[1] = "我是No.2";
return super.show();
}
}
;
listDialog.setTitle("我是一个列表Dialog");
listDialog.setItems(items, new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
// ...To-do }
}
);
/* @setOnDismissListener Dialog销毁时调用 * @setOnCancelListener Dialog关闭时调用 */ listDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
public void onDismiss(DialogInterface dialog) {
Toast.makeText(getApplicationContext(), "Dialog被销毁了", Toast.LENGTH_SHORT).show();
}
}
);
listDialog.show();
}
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。