Dialog

对话框

对话框是一个部分透明的浮动的Activity或者Fragment，它会部分的遮挡启动它的UI。对话框通常使用一个模糊层或模糊的过滤器来遮挡它后面的Activity。

一般对话框

DialogInterface.OnClickListener dialogOnClickListener = new DialogInterface.OnClickListener() { // 设置按钮监听
        @Override
        public void onClick(DialogInterface dialog, int which) {
            switch (which) {
            case Dialog.BUTTON_POSITIVE:
                Toast.makeText(MainActivity.this, "确认" + which,
                        Toast.LENGTH_SHORT).show();
                break;
            case Dialog.BUTTON_NEGATIVE:
                Toast.makeText(MainActivity.this, "取消" + which,
                        Toast.LENGTH_SHORT).show();
                break;
            case Dialog.BUTTON_NEUTRAL:
                Toast.makeText(MainActivity.this, "忽略" + which,
                        Toast.LENGTH_SHORT).show();
                break;
            }
            dialog.dismiss(); // 关闭dialog
        }
    };
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("我是标题");// 设置标题
    builder.setMessage("是否确认退出?"); // 设置内容
    builder.setIcon(R.drawable.ic_launcher);// 设置图标，图片id即可
    builder.setPositiveButton("确认", dialogOnClickListener);
    builder.setNegativeButton("取消", dialogOnClickListener);
    builder.setNeutralButton("忽略", dialogOnClickListener);
    // 参数都设置完成了，创建并显示出来
    builder.create().show();

列表对话框

final String items[] = { "张三", "李四", "王五" };
    // dialog参数设置
    AlertDialog.Builder builder = new AlertDialog.Builder(this); // 先得到构造器
    builder.setTitle("提示"); // 设置标题
    // builder.setMessage("是否确认退出?"); //设置内容
    builder.setIcon(R.drawable.ic_launcher);// 设置图标，图片id即可
    // 设置列表显示，注意设置了列表显示就不要设置builder.setMessage()了，否则列表不起作用。
    builder.setItems(items, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
            Toast.makeText(MainActivity.this, items[which],
                    Toast.LENGTH_SHORT).show();

        }
    });
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
            Toast.makeText(MainActivity.this, "确定", Toast.LENGTH_SHORT)
                    .show();
        }
    });
    builder.create().show();

单选对话框

final String items[] = { "男", "女" };
    AlertDialog.Builder builder = new AlertDialog.Builder(this); // 先得到构造器
    builder.setTitle("提示"); // 设置标题
    builder.setIcon(R.drawable.ic_launcher);// 设置图标，图片id即可
    builder.setSingleChoiceItems(items, 0,
            new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // dialog.dismiss();
                    Toast.makeText(MainActivity.this, items[which],
                            Toast.LENGTH_SHORT).show();
                }
            });
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
            Toast.makeText(MainActivity.this, "确定", Toast.LENGTH_SHORT)
                    .show();
        }
    });
    builder.create().show();

多选对话框

final String items[] = { "篮球", "足球", "排球" };
    final boolean selected[] = { true, false, true };
    AlertDialog.Builder builder = new AlertDialog.Builder(this); // 先得到构造器
    builder.setTitle("提示"); // 设置标题
    builder.setIcon(R.drawable.ic_launcher);// 设置图标，图片id即可
    builder.setMultiChoiceItems(items, selected,
            new DialogInterface.OnMultiChoiceClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which,
                        boolean isChecked) {
                    // dialog.dismiss();
                    Toast.makeText(MainActivity.this,
                            items[which] + isChecked, Toast.LENGTH_SHORT)
                            .show();
                }
            });
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
            Toast.makeText(MainActivity.this, "确定", Toast.LENGTH_SHORT)
                    .show();
            // android会自动根据你选择的改变selected数组的值。
            for (int i = 0; i < selected.length; i++) {
                Log.e("hongliang", "" + selected[i]);
            }
        }
    });
    builder.create().show();

自定义对话框

1. 新建一个类继承AlertDialog,并重写它的构造方法和onCreate方法

   public class CustomerDialog extends AlertDialog {

   private Context context;

   protected CustomerDialog(Context context) {
   super(context);
   this.context = context;
   }
   protected CustomerDialog(Context context,int theme) {
   super(context,theme);
   this.context = context;
   }

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

2. 在style文件中添加一个自定义的对话框style

   <style name="MyDialog" parent="@android:Theme.Dialog">         
       <item name="android:windowFrame">@null</item>        
       <item name="android:windowNoTitle">true</item>          
       <item name="android:windowBackground">@android:color/white</item>         
       <item name="android:windowIsFloating">true</item>         
       <item name="android:windowContentOverlay">@null</item>    
   </style> 
   

3. layout中自定义一个对话框布局

4. Activity中实例化对话框

   Dialog dialog = new CustomerDialog(this, R.style.MyDialog);
   dialog.show();