Android AlertDialog

• 一般的AlertDialog

//一般的AlertDialog
new AlertDialog.Builder(MainActivity.this)
        .setIcon(R.drawable.heart)
        .setTitle("警告")
        .setMessage("确定删除吗？")
        .setPositiveButton("确定",null)
        .setNegativeButton("不确定",null)
        .setNeutralButton("取消",null)
        .setCancelable(false)//允许取消
        .show();

• 自定义EditText

//AlertDialog自定义EditText
final EditText edt = new EditText(MainActivity.this);
new AlertDialog.Builder(MainActivity.this)
        .setIcon(R.drawable.heart)
        .setTitle("请输入")
        .setView(edt)
        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(MainActivity.this,"输入：" + edt.getText().toString(),Toast.LENGTH_LONG).show();
            }
        })
        .setNegativeButton("取消",null)
        .show();

• 列表

//AlertDialog列表
final String [] items = {"选项一","选项二","选项三","选项④"};
new AlertDialog.Builder(MainActivity.this)
        .setIcon(R.drawable.heart)
        .setTitle("列表")
        .setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(MainActivity.this,"点击了：" + items[i],Toast.LENGTH_SHORT).show();
            }
        })
        .setPositiveButton("确定", null)
        .setNegativeButton("取消",null)
        .show();

• 单选

//AlertDialog单选
final int pos = 2;
new AlertDialog.Builder(MainActivity.this)
        .setIcon(R.drawable.heart)
        .setTitle("单选")
        .setSingleChoiceItems(items,pos,new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(MainActivity.this,"点击了：" + items[i],Toast.LENGTH_SHORT).show();
            }
        })
        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(MainActivity.this,"选中：" + items[pos],Toast.LENGTH_SHORT).show();
            }
        })
        .setNegativeButton("取消",null)
        .show();

• 多选

//AlertDialog多选
final boolean checkedItems [] = {false,true,true,false};
new AlertDialog.Builder(MainActivity.this)
        .setIcon(R.drawable.heart)
        .setTitle("多选")
        .setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i, boolean b) {
                Toast.makeText(MainActivity.this,(b ? "选中：" : "未选中：") + items[i],Toast.LENGTH_SHORT).show();
            }
        })
        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                String s = "选中：";
                for(int j = 0;j < items.length;++j){//获取选中的选项
                    if(checkedItems[j]){
                        s = s + items[j] + "、";
                    }
                }
                Toast.makeText(MainActivity.this,s,Toast.LENGTH_SHORT).show();
            }
        })
        .setNegativeButton("取消",null)
        .show();

• 自定义View

//AlertDialog自定义View
final View login = View.inflate(MainActivity.this,R.layout.login,null);
final AlertDialog dlg = new AlertDialog.Builder(MainActivity.this).setIcon(R.drawable.heart)
        .setTitle("登录")
        .setView(login)//加载自定义View
        .create();//需要先create
login.findViewById(R.id.btn_login).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {//点击登录按钮
        Toast.makeText(MainActivity.this,"用户名：" + ((EditText)login.findViewById(R.id.edtName)).getText().toString() + " 密码：" + ((EditText)login.findViewById(R.id.edtPwd)).getText().toString(),Toast.LENGTH_LONG).show();
        dlg.dismiss();//login和dlg需要定义为final的
    }
});
dlg.show();