创建项目AlertDialogDemo如图
AlertDialogDemo.java文件代码如下：
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package |
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import |
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public AlertDialogDemo extendsActivity {
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/** Called when the activity is first created. */
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finalint DIALOG_WELCOME = 1;
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privateButton btn_alert;
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@Override
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publicvoid onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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btn_alert=(Button)findViewById(R.id.btn_dialog);
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btn_alert.setOnClickListener(newView.OnClickListener() {
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@Override
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publicvoid onClick(View v) {
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showDialog(DIALOG_WELCOME);//调用onCreateDialog
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}
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});
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}
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@Override
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protectedDialog onCreateDialog(intid, Bundle args) {
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switch(id) {
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caseDIALOG_WELCOME:
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returnnew AlertDialog.Builder(AlertDialogDemo.this)
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.setTitle("欢迎").setMessage("欢迎使用本程序")
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.setIcon(android.R.drawable.ic_dialog_info)
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.setPositiveButton("确定",new OnClickListener() {
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@Override
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publicvoid onClick(DialogInterface dialog,int which) {
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Toast.makeText(AlertDialogDemo.this,"点击\"确定\"按钮后",
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}
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}).create();
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default:
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returnnull;
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}
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}
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} |
main.xml文件如下：
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<?xmlversion="1.0"encoding="utf-8"?>
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<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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>
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<TextView |
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android:layout_width="fill_parent" |
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android:layout_height="wrap_content" |
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android:text="@string/app_title"
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/>
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<Button
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android:id="@+id/btn_dialog"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="弹出"/>
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</LinearLayout>
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运行实例效果截图：
时间： 2024-02-19 17:10:15