Dialog对话框

Dialog对话框

这个内容比较简单，所以就没用很多的文字解释，直接看代码

这是我们要讲的展示的所有东西：

首先我们来展示一些吐丝：有上诉4种：（这里的代码省略了基本的内容，只显示具体功能的代码）

//吐丝
        bt1.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                 Toast toast = Toast.makeText(MainActivity.this, "吐丝", Toast.LENGTH_SHORT);
                 toast.show();
            }
        });    

//居中吐丝
        bt2.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Toast toast = Toast.makeText(MainActivity.this, "吐丝", Toast.LENGTH_SHORT);
                /**
                 * toast.setGravity(int gravity, int xOffset, int yOffset)
                 * gravity:初始位置
                 * xOffset X轴的偏移量，+向右，-向左
                 * yOffset Y轴的偏移量，+向下，-向上
                 */
                toast.setGravity(Gravity.CENTER, 0, 0);
                toast.show();
            }
        });

//图片吐丝
        bt3.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Toast toast = Toast.makeText(MainActivity.this, "吐丝", Toast.LENGTH_SHORT);
                LinearLayout toast_layout = (LinearLayout)toast.getView();//得到toast的view（里面有吐丝两个字）
                ImageView iv = new ImageView(MainActivity.this);
                iv.setImageResource(R.drawable.ic_launcher);
                toast_layout.addView(iv);//往toast的view里面添加一个图片，因为toast是linerLayout类型，所以加在了下面
                toast.show();
            }
        });

 //自定义吐丝
        bt4.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Toast toast = new Toast(MainActivity.this);
                //将布局变成view对象
                LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
                View view = inflater.inflate(R.layout.diy, null);
                toast.setView(view);//调用toast的setView方法就能将view替换toast的样子
                toast.show();
            }
        });

接下来我们来展示一些对话框：

总的来说对话框是构建一个AlertDialog.Builder对象

这个对象是用来创建对话框的，通过把标题，图片，样式都传入给AlertDialog.Builder对象，

然后通过AlertDialog.Builder对象的create()方法返回一个AlertDialog对象，最后展示在页面上

AlertDialog.Builder对象的具体方法：

Bt1.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("确认对话框");
                builder.setIcon(R.drawable.ic_launcher);
                builder.setMessage("对话框显示的内容");
                builder.setPositiveButton("取消", new android.content.DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Toast toast = Toast.makeText(MainActivity.this, "取消被点拉", Toast.LENGTH_SHORT);
                         toast.show();
                    }
                });
                builder.setNegativeButton("确认", new android.content.DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Toast toast = Toast.makeText(MainActivity.this, "确认被点拉", Toast.LENGTH_SHORT);
                         toast.show();
                    }
                });
                AlertDialog dialog = builder.create();
                dialog.show();
            }
        });

Bt2.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("单选对话框");
                builder.setIcon(R.drawable.ic_launcher);
                /**
                 * builder.setSingleChoiceItems(String[] items, int checkedItem, listener);
                 * items:单选框的选项        这一参数除了可以是字符串，还可以是游标，适配器内的东西
                 * chekedItem:默认被选中的选项
                 */
                builder.setSingleChoiceItems(s, 0, new DialogInterface.OnClickListener() {
                    //int which:被选中的
                    public void onClick(DialogInterface dialog, int which) {
                        Toast toast = Toast.makeText(MainActivity.this, s[which]+"被选拉", Toast.LENGTH_SHORT);
                         toast.show();
                    }
                });
                AlertDialog dialog = builder.create();
                dialog.show();
            }
        });

Bt3.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("多选对话框");
                builder.setIcon(R.drawable.ic_launcher);
                /**
                 * builder.setMultiChoiceItems(String items, boolean[] checkedItems, listener)
                 * items:多选框的选项    这一参数除了可以是字符串，还可以是游标，适配器内的东西
                 * chekedItem:是否被选中
                 */
                builder.setMultiChoiceItems(s2, null, new OnMultiChoiceClickListener() {
                    //int which:被选中的         isChecked:true（没选的被选了）false（选了又取消了）
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        if(isChecked){
                            Toast toast = Toast.makeText(MainActivity.this, s2[which]+"被选拉", Toast.LENGTH_SHORT);
                             toast.show();
                        }else{
                            Toast toast = Toast.makeText(MainActivity.this, s2[which]+"没被选拉", Toast.LENGTH_SHORT);
                             toast.show();
                        }
                    }
                });
                AlertDialog dialog = builder.create();
                dialog.show();;
            }
        });

Bt4.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("列表对话框");
                builder.setIcon(R.drawable.ic_launcher);
                builder.setItems(s2, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Toast toast = Toast.makeText(MainActivity.this, s2[which]+"被点拉", Toast.LENGTH_SHORT);
                         toast.show();
                    }
                });
                AlertDialog dialog = builder.create();
                dialog.show();
            }
        });

Bt5.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("自定义对话框");
                builder.setIcon(R.drawable.ic_launcher);
                LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
                View view = inflater.inflate(R.layout.diy, null);
                builder.setView(view);
                AlertDialog dialog = builder.create();
                dialog.show();
                bt = (Button)view.findViewById(R.id.bb);
                bt.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                        Toast toast = Toast.makeText(MainActivity.this, "被发送了", Toast.LENGTH_SHORT);
                         toast.show();
                    }
                });
            }
        });

如果有什么错误，或者我理解错误或不当的，恳请大家纠正，谢谢！嘻嘻嘻