android多活动练习--人品计算器

效果图如下：

第二个页面：

显示结果和姓名、性别有关，代码如下：

activity_main.xml:

 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:orientation="vertical"
 7     tools:context=".MainActivity">
 8
 9     <EditText
10         android:id="@+id/name"
11         android:layout_width="match_parent"
12         android:layout_height="wrap_content"
13         android:hint="姓名" />
14
15     <RadioGroup
16         android:id="@+id/rg"
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content"
19         android:orientation="horizontal">
20
21         <RadioButton
22             android:id="@+id/rb1"
23             android:layout_width="wrap_content"
24             android:layout_height="wrap_content"
25             android:text="男" />
26
27         <RadioButton
28             android:id="@+id/rb2"
29             android:layout_width="wrap_content"
30             android:layout_height="wrap_content"
31             android:text="女" />
32
33         <RadioButton
34             android:id="@+id/rb3"
35             android:layout_width="wrap_content"
36             android:layout_height="wrap_content"
37             android:text="其他" />
38     </RadioGroup>
39
40     <Button
41         android:layout_width="wrap_content"
42         android:layout_height="wrap_content"
43         android:onClick="btnClick"
44         android:text="计算" />
45
46 </LinearLayout>

MainActivity.java：

 1 import android.content.Intent;
 2 import android.support.v7.app.AppCompatActivity;
 3 import android.os.Bundle;
 4 import android.text.TextUtils;
 5 import android.view.View;
 6 import android.widget.EditText;
 7 import android.widget.RadioButton;
 8 import android.widget.RadioGroup;
 9 import android.widget.TextView;
10 import android.widget.Toast;
11
12 public class MainActivity extends AppCompatActivity {
13
14     private EditText et_name;
15     private RadioGroup rg;
16     private RadioButton rb1;
17     private RadioButton rb2;
18     private RadioButton rb3;
19
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.activity_main);
24
25         initView();
26
27     }
28
29     public void initView() {
30         et_name = findViewById(R.id.name);
31         rg = findViewById(R.id.rg);
32         rb1 = findViewById(R.id.rb1);
33         rb1 = findViewById(R.id.rb3);
34         rb1 = findViewById(R.id.rb1);
35     }
36
37     public void btnClick(View view) {
38         //获取用户名
39         String name = et_name.getText().toString().trim();
40         //判断是否为空
41         if (TextUtils.isEmpty(name)) {
42             Toast.makeText(getApplicationContext(), "请输入姓名", Toast.LENGTH_SHORT).show();
43         } else {
44             //判断性别
45             int radioButtonId = rg.getCheckedRadioButtonId();
46             int sex = 0;//sex代表性别
47             switch (radioButtonId) {
48                 case R.id.rb1://代表男
49                     sex = 1;
50                     break;
51                 case R.id.rb2://代表女
52                     sex = 2;
53                     break;
54                 case R.id.rb3://代表其他
55                     sex = 3;
56                     break;
57             }
58             if (sex == 0) {
59                 Toast.makeText(getApplicationContext(), "请输入性别", Toast.LENGTH_SHORT).show();
60
61             } else {
62                 //跳转页面
63                 Intent intent = new Intent(MainActivity.this, ResultActivity.class);
64                 intent.putExtra("name", name);
65                 intent.putExtra("sex", sex);
66                 startActivity(intent);
67             }
68         }
69     }
70 }

activity_result.xml:

 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     tools:context=".ResultActivity"
 7     android:orientation="vertical">
 8     <TextView
 9         android:id="@+id/rName"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         android:text="张三"/>
13     <TextView
14         android:id="@+id/rSex"
15         android:layout_width="wrap_content"
16         android:layout_height="wrap_content"
17         android:text="男"/>
18     <TextView
19         android:id="@+id/result"
20         android:layout_width="wrap_content"
21         android:layout_height="wrap_content"
22         android:text="您的人品很好"/>
23
24 </LinearLayout>

ResulrActivity.java:

 1 import android.content.Intent;
 2 import android.net.Uri;
 3 import android.support.v7.app.AppCompatActivity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.widget.TextView;
 7
 8 import java.util.Random;
 9
10 public class ResultActivity extends AppCompatActivity {
11
12     private TextView rName;
13     private TextView rSex;
14     private TextView result;
15     private byte[] bytes;
16
17     @Override
18     protected void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.activity_result);
21
22         rName = findViewById(R.id.rName);
23         rSex = findViewById(R.id.rSex);
24         result = findViewById(R.id.result);
25
26         //获取传递来的数据
27         Intent intent = getIntent();
28         String name = intent.getStringExtra("name");
29         int sex = intent.getIntExtra("sex", 0);
30         rName.setText(name);
31         String str = name;
32         switch (sex) {
33             case 1:
34                 rSex.setText("男");
35                 str = name + "男";
36                 break;
37             case 2:
38                 rSex.setText("女");
39                 str = name + "女";
40                 break;
41             case 3:
42                 rSex.setText("其他");
43                 str = name + "其他";
44                 break;
45         }
46         //计算结果使用随机数
47         bytes = str.getBytes();
48         int totle = 0;
49         for (byte b : bytes) {
50             int number = b & 0xff;//b&1111 1111
51             totle += number;
52
53         }
54         int score = Math.abs(totle) % 100;
55         if (score > 90) {
56             result.setText("你的人品不错");
57         } else if (score > 90) {
58             result.setText("你的人品还行");
59         } else if (score > 70) {
60             result.setText("你的人品刚及格");
61         } else if (score > 50) {
62             result.setText("你快被世界抛弃了");
63         } else if (score > 40) {
64             result.setText("虽然被抛弃了，你要活着，");
65         }//重点不是数据，然是页面间的传值
66
67
68     }
69 }

这就完成了，只适合小白练习而已，做个小笔记。