alertdialog简单用法

new AlertDialog.Builder(MainActivity.this)
                .setTitle("aaa")
                .setIcon(R.drawable.ic_launcher)
                .setMessage("next")
                .setPositiveButton("确定按钮",
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface dialog,
                                    int which) {
                                // TODO Auto-generated method stub

                            }
                        }).setNegativeButton("普通按钮", new DialogInterface.OnClickListener() {
                            
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // TODO Auto-generated method stub
                                
                            }
                        }).setNeutralButton("取消按钮", new DialogInterface.OnClickListener() {
                            
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // TODO Auto-generated method stub
                                
                            }
                        }).show();

 列表项的对话框

private void itemDialog(){
        final String[] levle = {"1","2","3"};
        new AlertDialog.Builder(MainActivity.this)
        .setTitle("选择级别")
        //添加取消按钮,没有写事件
        .setNeutralButton("取消", new DialogInterface.OnClickListener() {
            
            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                
            }
        })
        //添加列表项  参数分别为数据，事件
        .setItems(levle, new DialogInterface.OnClickListener() {
            
            @Override
            //点击列表项会把结果显示到tv里
            public void onClick(DialogInterface dialog, int which) {
                MainActivity.this.tv.setText("选择的级别是"+levle[which]);
            }
        }).show();
    }

 复选对话框

private void muliItem(){
        final String[] data ={"1","2","3"};
        boolean[] b = {true,false,false};
        new AlertDialog.Builder(MainActivity.this)
        .setTitle("ok")
        //传入的参数分别是数据，默认选中状态，事件
　　　　　.setMultiChoiceItems(data, b, new OnMultiChoiceClickListener() {
            
            @Override
　　　　　　　　
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                String msg ="";
                for (int i = 0; i < data.length; i++) {
                    if(i==which && isChecked){
                        msg += data[which];
                    }
                }
                MainActivity.this.tv.append(msg);
                
            }
        }).setPositiveButton("确定", new DialogInterface.OnClickListener() {
            
            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
            }
        }).show();
    }

 用反射技术防止对话框意外关闭

//防止对话框意外关闭
    private void setCloseable(DialogInterface dialog,boolean b) {
        // TODO Auto-generated method stub
        Field field ;
        try {
            field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");
            field.setAccessible(true);
            field.set(dialog,b);
        } catch (NoSuchFieldException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

调用的时候直接调用就可以，传入的值为false就是不能关，true就是可以关闭