android 创建对话框

绝地灬酷狼 2022-08-26 03:55 214阅读 0赞

最近项目中需要用到自定义的对话框,设置对话框布局的宽度填充手机的宽度,但是却发现对话框的宽度还是仅仅包含自己,完全不依赖布局设置的大小,太奇怪了,为此伤神不少。于是找了好多方法,需要在代码中设置对话框的宽度。啥都先不说了，看看效果图

![SouthEast][]![SouthEast 1][]![SouthEast 2][]![SouthEast 3][]

本Demo用两种方式创建对话框

1.创建对话框(Activity)，即继承Activity,设置Activity的大小

2.创建对话框(Dialog),继承Dialog,设置Dialog的大小

例子的工程如下：

![SouthEast 4][]

主要有3个类：

(1).MainActivity,为显示启动界面,包含文字说明以及创建对话框按钮

(2).SecondActivity创建类似对话框的类

(3).DialogTest创建对话框类

1.MainActivity启动界面

public class MainActivity extends Activity \{ private Button mBtnAct; private Button mBtnDia; private Button mBtnShow; private TextView mTvMessage; @Override protected void onCreate(Bundle savedInstanceState) \{ super.onCreate(savedInstanceState); setContentView(R.layout.activity\_main); mBtnAct = (Button) findViewById(R.id.btn\_activity); mBtnDia = (Button) findViewById(R.id.btn\_dialog); mBtnShow = (Button) findViewById(R.id.btn\_ps); mTvMessage = (TextView) findViewById(R.id.tv\_message); mBtnAct.setOnClickListener(new OnClickListener() \{ @Override public void onClick(View v) \{ // TODO Auto-generated method stub Intent myIntent = new Intent(); myIntent.setClass(MainActivity.this, SecondActivity.class); startActivity(myIntent); \} \}); mBtnDia.setOnClickListener(new OnClickListener() \{ @Override public void onClick(View v) \{ // TODO Auto-generated method stub createCustomDialog(); \} \}); mBtnShow.setOnClickListener(new OnClickListener() \{ @Override public void onClick(View v) \{ // TODO Auto-generated method stub mTvMessage.setVisibility(View.VISIBLE); \} \}); \} //创建对话框 public void createCustomDialog() \{ DialogTest dialog = new DialogTest(MainActivity.this, R.style.MyDialog); dialog.show(); WindowManager m = getWindowManager(); Display d = m.getDefaultDisplay(); // 为获取屏幕宽、高 Window dialogWindow = dialog.getWindow(); LayoutParams lp = dialogWindow.getAttributes(); dialogWindow.setGravity(Gravity.CENTER); lp.height =(int) (d.getHeight() \* 0.3); // 高度设置为屏幕的0.3 lp.width = (int) (d.getWidth() \* 0.95); // 宽度设置为屏幕的0.95 dialogWindow.setAttributes(lp); \} \} 2.DialogTest ,继承Dialog ,创建自定义对话框 public class DialogTest extends Dialog \{ public DialogTest(Context context, int theme) \{ super(context, theme); \} @Override protected void onCreate(Bundle savedInstanceState) \{ setContentView(R.layout.dialog\_item); Button mBtn = (Button) findViewById(R.id.btn\_dismiss); mBtn.setOnClickListener(new View.OnClickListener() \{ @Override public void onClick(View v) \{ // TODO Auto-generated method stub DialogTest.this.dismiss(); \} \}); \} \} 3.SecondActivity ,该界面效果类似对话框窗口 public class SecondActivity extends Activity \{ @Override protected void onCreate(Bundle savedInstanceState) \{ setParams(); super.onCreate(savedInstanceState); setContentView(R.layout.activity\_main); \} //设置窗口的大小 public void setParams() \{ WindowManager m = getWindowManager(); Display d = m.getDefaultDisplay(); // 为获取屏幕宽、高 Window window = getWindow(); LayoutParams lp = window.getAttributes(); lp.height =(int) (d.getHeight() \* 0.8); // 高度设置为屏幕的0.3 lp.width = (int) (d.getWidth() \* 0.95); // 宽度设置为屏幕的0.95 window.setAttributes(lp); \} \}

以上就是具体的功能代码，Demo里面用到的布局、图片资源都放在下载里面去了，用到的朋友欢迎下载！有什么问题请留言！

[下载地址][Link 1]

[SouthEast]: https://img-blog.csdn.net/20140325153327468?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvenh3MTM2NTExNDg1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast
[SouthEast 1]: https://img-blog.csdn.net/20140325153411656?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvenh3MTM2NTExNDg1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast
[SouthEast 2]: https://img-blog.csdn.net/20140325153438234?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvenh3MTM2NTExNDg1/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast
[SouthEast 3]: /images/20220824/8b3dda66826d4d58aa8df8acba4f31cf.png
[SouthEast 4]: /images/20220824/22a4ce199a444488a2d794687c623291.png
[Link 1]: http://download.csdn.net/detail/zxw136511485/7096523