实现不选择选项则不可以关闭的对话框之步骤三

实现不选择选项则不可以关闭的对话框之方法三

本方法基于Dialog，使用自定义布局，更能满足发杂的需求。

布局文件：dialog_must_enter.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:layout_margin="@dimen/activity_horizontal_margin" >    <TextView        android:id="@+id/txtUsername"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/edtUsername"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:gravity="center"        android:text="姓名: " />    <EditText        android:id="@+id/edtUsername"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true"        android:layout_toRightOf="@+id/txtUsername"        android:ems="10" >        <requestFocus />    </EditText>    <TextView        android:id="@+id/txtHorizontalCenter"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/btnOK"        android:layout_below="@+id/edtUsername"        android:layout_centerHorizontal="true"        android:text="" />    <Button        android:id="@+id/btnOK"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/edtUsername"        android:layout_toLeftOf="@+id/txtHorizontalCenter"        android:text="确定" />    <Button        android:id="@+id/btnCancel"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/txtHorizontalCenter"        android:layout_toRightOf="@+id/txtHorizontalCenter"        android:text="取消" /></RelativeLayout>Java代码：

import android.app.Activity;import android.app.Dialog;import android.os.Bundle;import android.text.TextUtils;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {private Button btnOpenDialog;private Activity activity;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);activity = this;btnOpenDialog = (Button) findViewById(R.id.btnOpenDialog);btnOpenDialog.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {final Dialog dialog = new Dialog(activity);dialog.setContentView(R.layout.dialog_must_enter);dialog.setTitle("必填项Demo");final EditText edtUserName = (EditText) dialog.findViewById(R.id.edtUsername);Button btnOKOfDialog = (Button) dialog.findViewById(R.id.btnOK);btnOKOfDialog.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (!TextUtils.isEmpty(edtUserName.getText().toString().trim())) {dialog.dismiss();} else {Toast.makeText(activity, "姓名不能为空！", Toast.LENGTH_LONG).show();}}});Button btnCancelOfDialog = (Button) dialog.findViewById(R.id.btnCancel);btnCancelOfDialog.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {dialog.dismiss();}});dialog.show();}});}}

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