在我们想要创建AlertDialog时,我们知道由于AlertDialog 类的构造方法是protected 方法,所以要创建一个AlertDialog对象,就要用到它的内嵌类AlertDialog.Builder,最后还要用show()方法来显示这个对话框。
创建自定义登录对话框的
运行效果图如下
创建AlertDialog的布局文件alertdialog.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<EditText
android:id="@+id/username"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入用户名" >
</EditText>
<EditText
android:id="@+id/password"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入用密码"
android:password="true" >
</EditText>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<Button
android:id="@+id/btn_Ok"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="OK"
android:layout_weight="1">
</Button>
<Button
android:id="@+id/btn_cancle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cancle"
android:layout_weight="1" >
</Button>
</LinearLayout>
</LinearLayout>
Java 代码
public class AlertDialogActivity extends Activity {
private Button buton;
AlertDialog alertdialog;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button = (Button) findViewById(R.id.btn);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(
AlertDialogActivity.this);
LayoutInflater inflater = LayoutInflater
.from(AlertDialogActivity.this);
View view = inflater.inflate(R.layout.alertdialog, null);
builder.setTitle("登录对话框");
builder.setView(view);
alertdialog = builder.create();
alertdialog.show();
// 通过如下方法可获得对话框中的控件
final EditText et_uesrname = (EditText) view
.findViewById(R.id.username);
final EditText et_password = (EditText) view
.findViewById(R.id.password);
Button btn_ok = (Button) view.findViewById(R.id.btn_Ok);
Button btn_cancle = (Button) view.findViewById(R.id.btn_cancle);
}
});
}
}