3分钟
2.3 实施步骤
实施步骤
步骤1：新建一个Module，命名为Ex2_3。修改布局文件activity_main.xml。
表2-3-1 Ex2_3布局文件activity_main.xml清单
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="普通Dialog" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="列表Dialog" />
<Button
android:id="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="单选Dialog" />
<Button
android:id="@+id/button4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="多选Dialog" />
<Button
android:id="@+id/button5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="编辑Dialog" />
<Button
android:id="@+id/button6"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="自定义Dialog" />
</LinearLayout>步骤2：在/res/drawable/下添加/dialog.gif图片。
步骤3：在/res/layout/下添加custom_dialog.xml
表2-3-2 Ex2_3 布局文件custom_dialog.xml清单
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="自定义视图"
/>
<EditText
android:id="@+id/edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>步骤4：修改MainActivity.java内容.
表2-3-3 Ex2_3 MainActivity.java清单
package com.example.ex2_3;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends Activity {
private Button btn1,btn2,btn3,btn4,btn5,btn6;
private int theChoice;
private ArrayList<Integer> theChoices = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView(){
btn1=(Button)findViewById(R.id.button1);
btn2=(Button)findViewById(R.id.button2);
btn3=(Button)findViewById(R.id.button3);
btn4=(Button)findViewById(R.id.button4);
btn5=(Button)findViewById(R.id.button5);
btn6=(Button)findViewById(R.id.button6);
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showNormalDialog();
}
});
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showListDialog();
}
});
btn3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showChoiceDialog();
}
});
btn4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showMultiChoiceDialog();
}
});
btn5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showEditDialog();
}
});
btn6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showCustomlDialog();
}
});
}
//普通对话框
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.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) {
Toast.makeText(MainActivity.this, "ok", Toast.LENGTH_LONG).show();
}
});
normalDialog.setNegativeButton("关闭",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "no", Toast.LENGTH_LONG).show();
}
});
// 显示
normalDialog.show();
}
//列表对话框
private void showListDialog(){
final String[] items = {"A","B","C","D"};
AlertDialog.Builder listDialog = new AlertDialog.Builder(MainActivity.this);
listDialog.setTitle("我是一个列表对话框");
listDialog.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this,"你点击了"+items[which],Toast.LENGTH_SHORT).show();
}
});
listDialog.show();
}
//单选对话框
private void showChoiceDialog() {
final String[] items = { "我是1","我是2","我是3","我是4" };
theChoice = -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) {
theChoice = which;
}
});
singleChoiceDialog.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (theChoice != -1) {
Toast.makeText(MainActivity.this,
"你选择了" + items[theChoice],
Toast.LENGTH_SHORT).show();
}
}
});
singleChoiceDialog.show();
}
//多选对话框
private void showMultiChoiceDialog() {
final String[] items = { "华为","三星","魅族","一加" };
// 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};
theChoices.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) {
theChoices.add(which);
} else {
theChoices.remove(which);
}
}
});
multiChoiceDialog.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
int size = theChoices.size();
String str = "";
for (int i = 0; i < size; i++) {
str += items[theChoices.get(i)] + " ";
}
Toast.makeText(MainActivity.this,
"你选中了" + str,
Toast.LENGTH_SHORT).show();
}
});
multiChoiceDialog.show();
}
//输入对话框
private void showEditDialog() {
/*@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();
}
//自定义对话框
private void showCustomlDialog() {
/* @setView 装入自定义View （custom_dialog.xml）
* custom_dialog.xml可自定义复杂的View
*/
AlertDialog.Builder customDialog =
new AlertDialog.Builder(MainActivity.this);
final View dialogView = LayoutInflater.from(MainActivity.this)
.inflate(R.layout.custom_dialog,null);
customDialog.setTitle("我是一个视图自定义Dialog");
customDialog.setView(dialogView);
customDialog.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();
}
});
customDialog.show();
}
}步骤5：运行并观察效果
学员评价