android中弹框很多种，alert框，dialog,AlertDialog,popupwindow,DialogFragment,toast，dialog样式的activity等等，今天讲解AlertDialog的简单使用。

1 AlertDialog.Builder 设置相关参数

图标，title，message，按钮，是否点击消失等等。

public void showDialog(){ ImageView imageView = new ImageView(MainActivity.this); imageView.setImageResource(R.mipmap.ic_launcher); final AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); //title上的图标和文本 builder.setIcon(R.mipmap.ic_launcher); builder.setTitle("发现新版本"); //自定义的title //builder.setCustomTitle(imageView); //dialog中间显示的信息 // builder.setMessage("Message"); //设置是否可以取消 builder.setCancelable(false); //Set a custom view resource to be the contents of the Dialog //不是全部view，只是message下的contents //builder.setView(R.layout.activity_main); builder.setItems(new String[]{"aaaa", "bbbbb", "cccc"}, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }); //多选，单选item // builder.setMultiChoiceItems(); // builder.setSingleChoiceItems(); //确认按钮 builder.setPositiveButton( "立即更新", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); //取消按钮 builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); //具体位置和代码加载顺序无关，跟样式有关 builder.setNeutralButton("其他",new DialogInterface.OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { } }); AlertDialog dialog = builder.create(); dialog.show(); }

final AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); //title上的图标和文本 builder.setIcon(R.mipmap.ic_launcher); builder.setTitle("发现新版本"); //dialog中间显示的信息 builder.setMessage("Message"); //设置是否可以取消 builder.setCancelable(false); //Set a custom view resource to be the contents of the Dialog //不是全部view，只是message下的contents builder.setView(R.layout.activity_main); //确认按钮 builder.setPositiveButton( "立即更新", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); //取消按钮 builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); AlertDialog dialog = builder.create(); dialog.show();

如果只想显示按钮，不错任何操作： builder.setNegativeButton(“取消”,null);

//点击外部是否消失 setCanceledOnTouchOutside( false );

2 dialog 设置（字体大小，颜色设置）

dialog.show之后，依然可以进行dialog的设置。

AlertDialog dialog = builder.create(); dialog.show(); // 必须在执行show之后才能来设置 TextView tvMsg = (TextView) dialog.findViewById(android.R.id.message); tvMsg.setTextSize(16); tvMsg.setTextColor(Color.RED); //设置按钮的字体，颜色 dialog.getButton(dialog.BUTTON_NEGATIVE).setTextSize(17); dialog.getButton(dialog.BUTTON_NEGATIVE).setTextColor(Color.BLUE); dialog.getButton(dialog.BUTTON_POSITIVE).setTextSize(17); dialog.getButton(dialog.BUTTON_POSITIVE).setTextColor(Color.BLACK);

设置自定义view：

AlertDialog dialog = builder.create(); dialog.show(); dialog.setContentView(R.layout.activity_main); TextView textView = dialog.findViewById(R.id.idtv); textView.setText("sldfjslfjlsfjsf"); textView.setTextColor(Color.RED);

源码解释：

/** * Set the screen content from a layout resource. The resource will be * inflated, adding all top-level views to the screen. * * @param layoutResID Resource ID to be inflated. */ public void setContentView(@LayoutRes int layoutResID) { mWindow.setContentView(layoutResID); }

dialog重新获取事件，进行更新：

dialog.getButton(dialog.BUTTON_NEGATIVE).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { } });

设置背景： dialog.getWindow().setBackgroundDrawable( new ColorDrawable( 0 ) );