练习题

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.administrator.lx">
 4 
 5     <application
 6         android:allowBackup="true"
 7         android:icon="@mipmap/ic_launcher"
 8         android:label="@string/app_name"
 9         android:supportsRtl="true"
10         android:theme="@style/AppTheme">
11         <activity android:name=".MainActivity">
12             <intent-filter>
13                 <action android:name="android.intent.action.MAIN" />
14 
15                 <category android:name="android.intent.category.LAUNCHER" />
16             </intent-filter>
17         </activity>
18     </application>
19 
20 </manifest>

 1 package com.example.administrator.lx;
 2 
 3 import android.app.AlertDialog;
 4 import android.content.DialogInterface;
 5 import android.content.Intent;
 6 import android.net.Uri;
 7 import android.support.v7.app.AppCompatActivity;
 8 import android.os.Bundle;
 9 import android.view.LayoutInflater;
10 import android.view.View;
11 import android.widget.Toast;
12 
13 import java.net.URI;
14 
15 public class MainActivity extends AppCompatActivity {
16 
17     @Override
18     protected void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.activity_main);
21     }
22 
23     public void suiji(View v)
24     {
25         LayoutInflater layoutInflater = getLayoutInflater();
26         View view = layoutInflater.inflate(R.layout.suiji,null);
27         new  AlertDialog.Builder(this)
28                 .setTitle("随机数")
29                 .setView(view)
30                 .show();
31     }
32     public void duihua(View v)
33     {
34         AlertDialog alertDialog = new AlertDialog.Builder(this)
35                 .setTitle("提示")
36                 .setMessage("你确定要删除吗？")
37                 .setNegativeButton("取消", new DialogInterface.OnClickListener() {
38                     @Override
39                     public void onClick(DialogInterface dialog, int which) {
40                         Toast.makeText(MainActivity.this, "取消删除……", Toast.LENGTH_SHORT).show();
41                     }
42                 })
43                 .setPositiveButton("确定", new DialogInterface.OnClickListener() {
44                     @Override
45                     public void onClick(DialogInterface dialog, int which) {
46                         Toast.makeText(MainActivity.this, "确定删除……", Toast.LENGTH_SHORT).show();
47                     }
48                 })
49                 .setCancelable(false)
50                 .show();
51     }
52     public void phone(View v)
53     {
54         LayoutInflater layoutInflater = getLayoutInflater();
55         View view = layoutInflater.inflate(R.layout.phone, null);
56 
57         new AlertDialog.Builder(this)
58 
59                 .setTitle("phone")
60                 .setView(view)
61                 .setCancelable(false)
62                 .show();
63 
64         Intent intent = new Intent(Intent.ACTION_CALL);
65 
66         Uri uri = Uri.parse("");
67 
68         intent.setData(uri);
69 
70         try {
71             startActivity(intent);
72         }
73         catch (Exception e)
74         {
75             e.printStackTrace();
76         }
77     }
78 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.administrator.lx.MainActivity"
11     android:orientation="vertical">
12 
13     <Button
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:text="随机数"
17         android:onClick="suiji"/>
18     <Button
19         android:layout_width="match_parent"
20         android:layout_height="wrap_content"
21         android:text="对话框"
22         android:onClick="duihua"/>
23     <Button
24         android:layout_width="match_parent"
25         android:layout_height="wrap_content"
26         android:text="电话短信"
27         android:onClick="phone"/>
28 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical" android:layout_width="match_parent"
 4     android:layout_height="match_parent">
 5     <TextView
 6         android:layout_width="match_parent"
 7         android:layout_height="wrap_content"
 8         android:text="请点击按钮生成随机数"
 9         android:textSize="20dp"/>
10     <EditText
11         android:layout_width="match_parent"
12         android:layout_height="wrap_content"
13         />
14     <Button
15         android:layout_width="match_parent"
16         android:layout_height="wrap_content"
17         android:text="单击生成"
18         android:id="@+id/suiji"
19         />
20 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical" android:layout_width="match_parent"
 4     android:layout_height="match_parent">
 5     <EditText
 6         android:layout_width="match_parent"
 7         android:layout_height="wrap_content"
 8         android:hint="请输入电话号码"
 9         android:id="@+id/text"/>
10     <Button
11         android:layout_width="match_parent"
12         android:layout_height="wrap_content"
13         android:text="拨打电话"
14         android:id="@+id/phone"
15         android:onClick="ding"/>
16     <Button
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content"
19         android:text="发送短信"
20         android:id="@+id/sms"
21         android:onClick="dang"/>
22 </LinearLayout>