Android 中的几种对话框

普通对话框

 //普通对话框
    public void click1(View v) {

        /*
         * 这里的上下文只能用this
          * 因为
          * getApplicationContext 直接返回context  （父类）
          * this是继承context                       （子类）
          * */
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("警告");
        builder.setMessage("没网了");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //关闭对话框
                dialog.dismiss();
            }
        });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //关闭对话框
                dialog.dismiss();
            }
        });
        //必须像Toast一样show出来
        builder.show();
    }

单选对话框

//单选对话框
    public void click2(View v){

        AlertDialog.Builder builder=new AlertDialog.Builder(this);
        builder.setTitle("学习的编程语言");
        //内部类访问外部类需声明final
        final String items[]={"C","Java","Html","C++"};
        //-1表示没有选中
        builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //显示选中的数据
               String con= items[which];
                Toast.makeText(getApplicationContext(),con,Toast.LENGTH_LONG).show();
                //关闭对话框
                dialog.dismiss();
            }
        });

        builder.show();
    }

多选对话框

//多选对话框
    public void click3(View v){
        AlertDialog.Builder builder =new AlertDialog.Builder(this);
        builder.setTitle("你喜欢的编程语言：");
        //内部类访问外部类需声明final
        final String items[]={"C","Java","Html","C++"};
        //选中的位置
        final boolean []checkedItems={true,true,false,false};

        final StringBuffer sb=new StringBuffer();
        builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {

            }
        });

//点击确定显示选中的数据，关闭对话框
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //取出选中的数据

        
                for (int i=0;i<items.length;i++){
                    if(checkedItems[i]){
                        String item = items[i];
                        sb.append(item+" ");
                    }
                }
                //显示数据
                Toast.makeText(getApplicationContext(),sb.toString(),Toast.LENGTH_LONG).show();
                //关闭窗口
                dialog.dismiss();
            }
        });

        builder.show();
    }

进度条对话框

//进度条对话框
    public void click4(View v){
        final ProgressDialog dialog=new ProgressDialog(this);
        dialog.setTitle("正在加载中：");
        //设置成水平线
        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        //显示
        dialog.show();
          new Thread(){
              @Override
              public void run() {
                  super.run();
                  dialog.setMax(100);
                  for(int i=0;i<=100;i++){

                      dialog.setProgress(i);
                      //等价于 Thread.sleep(50);但不报异常
                      SystemClock.sleep(50);

                  }
                  //关闭进度条
                  dialog.dismiss();
              }
          }.start();


    }