//创建Dialog
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
//设置标题图标
builder.setIcon(R.drawable.ic_launcher);
//设置标题
builder.setTitle("这是一个对话框");
//设置信息
builder.setMessage("是否要跳转？");
//确定按钮
setPositiveButton(CharSequence text, DialogInterface.OnClickListener listener)
//取消按钮
setNegativeButton (CharSequence text, DialogInterface.OnClickListener listener)
//忽略
setNeutralButton (CharSequence text, DialogInterface.OnClickListener listener)
//显示对话框
show();

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
     builder.setIcon(R.drawable.ic_launcher);
     builder.setTitle("选择一个城市");
     //下拉列表的数据源
     final String[] cities = {"北京", "上海", "广州", "深圳", "杭州"};
     builder.setItems(cities, new DialogInterface.OnClickListener(){
       @Override
       public void onClick(DialogInterface dialog, int which){
         Toast.makeText(MainActivity.this, "你选择的城市为：" + cities[which], Toast.LENGTH_SHORT).show();
       }
 });
 builder.show();

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
    builder.setIcon(R.drawable.ic_launcher);
    builder.setTitle("请选择性别");
    final String[] sex = {"男", "女"};
    //第二个参数指定默认哪个单选框被勾中
    builder.setSingleChoiceItems(sex, 1, new DialogInterface.OnClickListener(){
      @Override
      public void onClick(DialogInterface dialog, int which){
          Toast.makeText(MainActivity.this, "性别为：" + sex[which], Toast.LENGTH_SHORT).show();
      }
    });
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener(){
      @Override
      public void onClick(DialogInterface dialog, int which){
            
      }
    });
    builder.setNegativeButton("取消", new DialogInterface.OnClickListener(){
      @Override
      public void onClick(DialogInterface dialog, int which){
            
      }
    });
builder.show();

String str;
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setIcon(R.drawable.ic_launcher);
builder.setTitle("选择你想看的电视剧");
final String[] hobbies = {"廷禧攻略", "扶摇", "香蜜沉沉烬如霜", "如懿传"};
//第二个参数代表哪几个选项被选择，需要传递一个boolean[]数组进去，其长度要和第一个参数的长度相同,如果null表示都不选
builder.setMultiChoiceItems(hobbies, null, new DialogInterface.OnMultiChoiceClickListener(){
　 @Override
　　public void onClick(DialogInterface dialog, int which, boolean isChecked){
  　　if(isChecked){
  　　　　str.append(hobbies[which] + ", ");
  　　}
  　　Toast.makeText(MainActivity.this, "选择的是：" + str.toString(), Toast.LENGTH_SHORT).show();
  }
 });
builder.setPositiveButton("确定", new DialogInterface.OnClickListener(){
　　@Override
　　public void onClick(DialogInterface dialog, int which){

  }
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener(){
　　@Override
　　public void onClick(DialogInterface dialog, int which){

  }
});
builder.show();

ProgressDialog waitingDialog= new ProgressDialog(MainActivity.this);
waitingDialog.setTitle("等待加载中，请稍后...");
waitingDialog.setMessage("等待中...");
waitingDialog.setIndeterminate(true);//采用不确定式的进度条
waitingDialog.setCancelable(false);//点击外部不取消对话框
waitingDialog.show();

int MAXPD = 100;
ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setProgress(0);//设置默认值
progressDialog.setTitle("正在下载");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);//进度条样式
progressDialog.setMax(MAXPD);//设置最大值
progressDialog.show();

public class CustomDialog extends Dialog {
//标题
protected TextView hintTv;
//左边按钮
protected Button doubleLeftBtn;
//右边按钮
protected Button doubleRightBtn;
//输入框
public EditText editText;
public CustomDialog(Context context) {
  super(context, R.style.CustomDialogStyle);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  this.setCancelable(false); // 是否可以撤销
  setContentView(R.layout.dialog_custom);
  hintTv = findViewById(R.id.tv_common_dialog_hint);
  doubleLeftBtn = findViewById(R.id.btn_common_dialog_double_left);
  doubleRightBtn = findViewById(R.id.btn_common_dialog_double_right);
  editText = findViewById(R.id.et_common_dialog);
}
//置右键文字和点击事件
public void setRightButton(String rightStr, View.OnClickListener clickListener) {
  doubleRightBtn.setOnClickListener(clickListener);
  doubleRightBtn.setText(rightStr);
}
//设置左键文字和点击事件
public void setLeftButton(String leftStr, View.OnClickListener clickListener) {
  doubleLeftBtn.setOnClickListener(clickListener);
  doubleLeftBtn.setText(leftStr);
}
//设置提示内容
public void setHintText(String str) {
  hintTv.setText(str);
  hintTv.setVisibility(View.VISIBLE);
}
//给两个按钮 设置文字
public void setBtnText(String leftStr, String rightStr) {
  doubleLeftBtn.setText(leftStr);
  doubleRightBtn.setText(rightStr);
}
}

//弹出dialog时隐藏底部虚拟按键
dialog.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
dialog.getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
  @Override
  public void onSystemUiVisibilityChange(int visibility) {
    int uiOptions =View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
    if (Build.VERSION.SDK_INT >= 19) {
      uiOptions |= 0x00001000;
    } else {
      uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
    }
    dialog.getWindow().getDecorView().setSystemUiVisibility(uiOptions);
  }
});

CustomDialog dialog = new CustomDialog(this);
dialog.setHintText("请输入密码");
dialog.setLeftButton("取消", new View.OnClickListener() {
    @Override
    public void onClick(View v) {
      dialog.dismiss();
    }
});
dialog.setRightButton("确定", new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        
    }
});
dialog.show();