AlertDialog简析



AlertDialog.builer创建对话框。

常用方法：

setTitle  设置标题
setIcon   设置图标
setMessage  设置内容
setItems  设置对话框中显示的项目列表
setView   设置自定义样式

setSingleChoiceItems 设置对话框显示一个单选框
setMultiChoiceItems 设置对话框显示一系列的复选框

setPositiveButton 对话框添加确定按钮
setNegativeButton 对话框添加取消按钮
setNeutralButton 普通按钮
create   创建对话框
show   显示对话框

简单的AlertDialog对话框

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Dialog alertDialog = new AlertDialog.Builder(this)     //创建对话框   .setTitle("简单对话框")    //设置标题   .setMessage("hello")    //设置内容   .setIcon(R.drawable.ic_launcher)  //设置图标   .create();     //完成对话框的创建alertDialog.show();     //显示对话框 }}

效果图：

带按钮的AlertDialog对话框

 在上面加几个Button，实现删除操作的提示对话框

     setPositiveButton
     setNegativeButton
     setNeutralButton

 

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Dialog alertDialog = new AlertDialog.Builder(this).setTitle("确定删除？").setMessage("您确定删除这条消息吗？").setIcon(R.drawable.ic_launcher).setPositiveButton("确定", new DialogInterface.OnClickListener() {//添加确定按钮@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {//添加取消按钮@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).setNeutralButton("查看详情", new DialogInterface.OnClickListener() {//添加普通按钮@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).create();alertDialog.show();}}

效果图：

类似ListView的AlertDialog对话框

//核心方法setItems(CharSequence[] items, final OnClickListener listener)

//参数1，要显示的数据的数组

//参数2，点击某个item的触发事件

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);final String[] arrayWarringStates = new String[] { "齐", "楚", "秦", "燕", "赵", "魏", "韩" };Dialog alertDialog = new AlertDialog.Builder(this).setTitle("你喜欢哪个国家？").setIcon(R.drawable.ic_launcher).setItems(arrayWarringStates, new DialogInterface.OnClickListener() { //设置对话框中显示的项目列表@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this,"您加入了"+arrayWarringStates[which]+"国", Toast.LENGTH_SHORT).show();}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).create();alertDialog.show();}}

效果图：

 

类似RadioButton的AlertDialog

//核心方法setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener)

//参数1，要显示的数据的数组

//参数2，初始值（初始被选中的item），

//参数3，点击某个item的触发事件

public class MainActivity extends Activity {private int selectedCountryIndex = 0;//默认选择项@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);final String[] arrayWarringStates = new String[] { "齐", "楚", "秦", "燕","赵", "魏", "韩" };Dialog alertDialog = new AlertDialog.Builder(this).setTitle("你喜欢哪个国家？").setIcon(R.drawable.ic_launcher)//设置对话框显示一个单选框.setSingleChoiceItems(arrayWarringStates, selectedCountryIndex,new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {selectedCountryIndex = which;}}).setPositiveButton("确认", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Toast.makeText(MainActivity.this,"您加入了"+arrayWarringStates[selectedCountryIndex]+"国",Toast.LENGTH_SHORT).show();// TODO Auto-generated method stub}}).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).create();alertDialog.show();}}

效果图：

 

类似CheckBox的AlertDialog对话框

//核心方法setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, final OnMultiChoiceClickListener listener)

//参数1，要显示的数据的数组，

//参数2，选中状态的数组，

//参数3，点击某个item的触发事件

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);final String[] arrayWarringStates = new String[] { "齐", "楚", "秦", "燕","赵", "魏", "韩" };

//选项初始化        final boolean[] selectedCountryIndex = new boolean[] {true, true, false, false, false, false, false};         Dialog alertDialog = new AlertDialog.Builder(this).setTitle("你喜欢哪个国家？").setIcon(R.drawable.ic_launcher)//设置对话框显示一系列的复选框 .setMultiChoiceItems(arrayWarringStates,selectedCountryIndex,new  DialogInterface.OnMultiChoiceClickListener() {                                       @Override                     public void onClick(DialogInterface dialog, int which, boolean isChecked) {                     selectedCountryIndex[which] = isChecked;                     }                 }).setPositiveButton("确认", new DialogInterface.OnClickListener() {                    @Override                     public void onClick(DialogInterface dialog, int which) {                         StringBuilder stringBuilder = new StringBuilder(); //判断复选结果                        for (int i = 0; i < selectedCountryIndex.length; i++) {                             if (selectedCountryIndex[i] == true)                             { //字符串，用”、”把选项连接起来                                stringBuilder.append(arrayWarringStates[i] + "、");                            }                         }                         Toast.makeText(MainActivity.this, stringBuilder.toString(), Toast.LENGTH_SHORT).show();                     }                 })                .setNegativeButton("取消", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 })                .create();         alertDialog.show();     } }

效果图：

 

自定义View的AlertDialog

//核心方法setView

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);// 取得自定义View// 动态加载布局生成View对象LayoutInflater layoutInflater = LayoutInflater.from(this);            View myloginView = layoutInflater.inflate(R.layout.activity_main, null);Dialog alertDialog = new AlertDialog.Builder(this).setTitle("用户登录").setIcon(R.drawable.ic_launcher).setView(myloginView).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).setPositiveButton("登陆", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stub}}).create();alertDialog.show();}}

效果图：

 

 

另外也可以使用内部类来封装各按钮的点击事件