Android中对话框的用法（单选，多选，确定，取消）

核心类：AlertDialog， 处理都是由内部类来搞。

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void click1(View v){
AlertDialog.Builder builder = new Builder(this);
//设置图标
builder.setIcon(android.R.drawable.alert_dark_frame);
//设置标题
builder.setTitle("欲练此功必先自宫");
//设置文本
builder.setMessage("李志平，想清楚哦");

//设置确定按钮
builder.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "感谢使用本软件,再见", 0).show();
}
});

//设置取消按钮
builder.setNegativeButton("取消", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "若不自宫,一定不成功", 0).show();
}
});
//使用创建器,生成一个对话框对象
AlertDialog ad = builder.create();
ad.show();
}

public void click2(View v){
AlertDialog.Builder builder = new Builder(this);
builder.setTitle("请选择性别");
final String[] items = new String[]{
"男",
"女"
};

builder.setSingleChoiceItems(items, -1, new OnClickListener() {

//which:用户所选的条目的下标
//dialog:触发这个方法的对话框
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "您选择的是:" + items[which], 0).show();
//关闭对话框
dialog.dismiss();
}
});
builder.show();
}

public void click3(View v){
AlertDialog.Builder builder = new Builder(this);
builder.setTitle("请选择您觉得帅的人");
final String[] items = new String[]{
"侃哥",
"赵帅哥",
"赵老师",
"赵师兄"
};
final boolean[] checkedItems = new boolean[]{
true,
true,
false,
false

};

builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {

//which:用户点击的条目的下标
//isChecked:用户是选中该条目还是取消该条目
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
checkedItems[which] = isChecked;

}
});

//设置一个确定按钮
builder.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
String text = "";
for(int i = 0; i < 4; i++){
text += checkedItems[i]? items[i] + "," : "";
}
Toast.makeText(MainActivity.this, text, 0).show();
dialog.dismiss();
}
});
builder.show();
}
}