Android第七次作业

1.三个界面，界面1点击按钮使用显式意图开启界面2.

   界面2点击按钮隐式意图开启界面3

 
 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     android:orientation="vertical"
 8     tools:context=".MainActivity">
 9 
10     <Button
11         android:id="@+id/bt_1"
12         android:layout_width="wrap_content"
13         android:layout_height="wrap_content"
14         android:background="#F2B4FC"
15         android:text="显示意图开启界面2"
16         android:textSize="20sp"
17         android:textColor="#000000"
18         android:layout_marginTop="20dp"
19         android:layout_marginLeft="10dp"/>
20 
21 </LinearLayout>
 1 package com.example.Lwk1;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.content.Intent;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.Button;
 9 
10 public class MainActivity extends AppCompatActivity {
11 
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main);
16         Button btn1=(Button)findViewById(R.id.bt_1);
17         btn1.setOnClickListener(new View.OnClickListener() {
18             @Override
19             public void onClick(View view) {
20                 Intent intent=new Intent(MainActivity.this,Main2Activity.class);
21                 startActivity(intent);
22             }
23         });
24     }
25 }
 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:app="http://schemas.android.com/apk/res-auto"
 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=".Main2Activity">
 8 
 9     <Button
10         android:id="@+id/bt_2"
11         android:layout_width="wrap_content"
12         android:layout_height="wrap_content"
13         android:background="#EEA6BF"
14         android:text="隐式意图开启界面3"
15         android:textSize="20sp"
16         android:textColor="#000000"
17         android:layout_marginLeft="10dp"
18         android:layout_marginTop="20dp"/>
19 
20 </LinearLayout>
 1 package com.example.Lwk1;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.content.Intent;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.Button;
 9 
10 public class Main2Activity extends AppCompatActivity {
11 
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main2);
16         Button btn2=(Button)findViewById(R.id.bt_2);
17         btn2.setOnClickListener(new View.OnClickListener() {
18             @Override
19             public void onClick(View view) {
20                 Intent intent=new Intent();
21                 intent.setAction("com.ym.second");
22                 startActivity(intent);
23             }
24         });
25     }
26 }
 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     android:background="#A5D4FA"
 8     tools:context=".Main3Activity">
 9 
10     <TextView
11         android:id="@+id/tv_1"
12         android:layout_width="wrap_content"
13         android:layout_height="wrap_content"
14         android:text="界面3"
15         android:textSize="20sp"
16         android:textColor="#000000"/>
17 
18 </RelativeLayout>
 1 <activity android:name=".Main3Activity">
 2             <intent-filter>
 3                 <action android:name="com.ym.second" />
 4 
 5                 <category android:name="android.intent.category.DEFAULT" />
 6             </intent-filter>
 7         </activity>
 8         <activity android:name=".Main2Activity" >
 9         </activity>
10         <activity android:name=".MainActivity">
11             <intent-filter>
12                 <action android:name="android.intent.action.MAIN" />
13 
14                 <category android:name="android.intent.category.LAUNCHER" />
15             </intent-filter>
16         </activity>

 

 

2.在界面1做一个按钮开启浏览器访问百度

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     android:orientation="vertical"
 8     android:background="#F7DDFC"
 9     tools:context=".MainActivity">
10 
11     <Button
12         android:id="@+id/bt_1"
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:background="#77DDEB"
16         android:text="显式意图开启界面2"
17         android:textSize="20sp"
18         android:layout_marginTop="20dp"
19         android:layout_marginLeft="20dp"/>
20     <Button
21         android:id="@+id/bt_3"
22         android:layout_width="wrap_content"
23         android:layout_height="wrap_content"
24         android:background="#56AEF5"
25         android:text="开启浏览器访问百度"
26         android:textSize="20sp"
27         android:layout_marginTop="20dp"
28         android:layout_marginLeft="20dp"
29         android:padding="10dp"
30         android:onClick="click3"/>
31 
32 </LinearLayout>
 1 package com.example.Lwk2;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.content.Intent;
 6 import android.net.Uri;
 7 import android.os.Bundle;
 8 import android.view.View;
 9 import android.widget.Button;
10 
11 public class MainActivity extends AppCompatActivity {
12 
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.activity_main);
17         Button btn1=(Button)findViewById(R.id.bt_1);
18         btn1.setOnClickListener(new View.OnClickListener() {
19             @Override
20             public void onClick(View view) {
21                 Intent intent=new Intent(MainActivity.this,Main2Activity.class);
22                 startActivity(intent);
23             }
24         });
25     }
26     public void click3(View view){
27         Intent intent=new Intent();
28         intent.setAction("android.intent.action.VIEW");
29         intent.setData(Uri.parse("http://www.baidu.com"));
30         startActivity(intent);
31     }
32 }

 

3.2个edittext,4个按钮一个textview，实现简单计算器。

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     android:orientation="vertical"
 8     android:id="@+id/a_1"
 9     android:background="#F1B3FC"
10     tools:context=".MainActivity">
11     <TextView
12         android:id="@+id/tv_1"
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:text="计算器"
16         android:textSize="25dp"
17         android:layout_margin="20dp" />
18 
19     <EditText
20         android:id="@+id/et_1"
21         android:layout_width="200dp"
22         android:layout_height="wrap_content"
23         android:hint="请输入一个数"
24         android:layout_marginLeft="100dp"
25         android:layout_marginRight="100dp"
26         android:layout_marginTop="100dp"
27         android:inputType="number"
28         android:gravity="center"
29         android:textSize="20sp"/>
30     <EditText
31         android:id="@+id/et_2"
32         android:layout_width="200dp"
33         android:layout_height="wrap_content"
34         android:hint="请输入一个数"
35         android:layout_marginLeft="100dp"
36         android:layout_marginRight="100dp"
37         android:inputType="number"
38         android:gravity="center"
39         android:textSize="20sp" />
40     <LinearLayout
41         android:id="@+id/a_2"
42         android:layout_width="wrap_content"
43         android:layout_height="wrap_content"
44         android:orientation="horizontal"
45         android:layout_marginTop="20dp"
46         android:layout_marginRight="20dp"
47         android:layout_marginLeft="20dp">
48         <Button
49             android:id="@+id/bt_1"
50             android:layout_width="wrap_content"
51             android:layout_height="wrap_content"
52             android:text="加(+)"
53             android:background="#F7BACE"/>
54         <Button
55             android:id="@+id/bt_2"
56             android:layout_width="wrap_content"
57             android:layout_height="wrap_content"
58             android:text="减(-)"
59             android:background="#F7BACE" />
60         <Button
61             android:id="@+id/bt_3"
62             android:layout_width="wrap_content"
63             android:layout_height="wrap_content"
64             android:text="乘(*)"
65             android:background="#F7BACE"/>
66         <Button
67             android:id="@+id/bt_4"
68             android:layout_width="wrap_content"
69             android:layout_height="wrap_content"
70             android:text="除(/)"
71             android:background="#F7BACE"/>
72     </LinearLayout>
73     <TextView
74         android:id="@+id/tv_2"
75         android:layout_width="wrap_content"
76         android:layout_height="wrap_content"
77         android:text="结果="
78         android:textSize="25sp"
79         android:textColor="#000000"
80         android:layout_marginLeft="150dp"
81         android:layout_marginRight="150dp"
82         android:layout_marginTop="50dp"
83         android:gravity="center"/>
84 
85 
86 </LinearLayout>
 1 package com.example.Lwk3;
 2 
 3 import androidx.appcompat.app.AppCompatActivity;
 4 
 5 import android.content.Intent;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.EditText;
 9 import android.widget.TextView;
10 
11 public class MainActivity extends AppCompatActivity {
12 
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.activity_main);
17         findViewById(R.id.bt_1).setOnClickListener(new View.OnClickListener() {
18             @Override
19             public void onClick(View view) {
20                 String num1=((EditText)(findViewById(R.id.et_1))).getText().toString();//获取et_1上面的文本，并转成字符串
21                 String num2=((EditText)(findViewById(R.id.et_2))).getText().toString();//获取et_2上面的文本，并转成字符串
22 
23                 int n1= Integer.parseInt(num1);
24                 int n2= Integer.parseInt(num2);
25                 int sum=n1+n2;
26                 TextView tv_1=findViewById(R.id.tv_2);//获取TextView 控件
27                 tv_1.setText("结果="+sum);
28             }
29         });
30         findViewById(R.id.bt_2).setOnClickListener(new View.OnClickListener() {
31             @Override
32             public void onClick(View view) {
33                 String num1=((EditText)(findViewById(R.id.et_1))).getText().toString();
34                 String num2=((EditText)(findViewById(R.id.et_2))).getText().toString();
35                 int n1=Integer.parseInt(num1);
36                 int n2=Integer.parseInt(num2);
37                 int sum=n1-n2;
38                 TextView tv_1=findViewById(R.id.tv_2);
39                 tv_1.setText("结果="+sum);
40             }
41         });
42         findViewById(R.id.bt_3).setOnClickListener(new View.OnClickListener() {
43             @Override
44             public void onClick(View view) {
45                 String num1=((EditText)(findViewById(R.id.et_1))).getText().toString();
46                 String num2=((EditText)(findViewById(R.id.et_2))).getText().toString();
47                 int n1=Integer.parseInt(num1);
48                 int n2=Integer.parseInt(num2);
49                 int sum=n1*n2;
50                 TextView tv_1=findViewById(R.id.tv_2);
51                 tv_1.setText("结果="+sum);
52             }
53         });
54         findViewById(R.id.bt_4).setOnClickListener(new View.OnClickListener() {
55             @Override
56             public void onClick(View view) {
57                 String num1=((EditText)(findViewById(R.id.et_1))).getText().toString();
58                 String num2=((EditText)(findViewById(R.id.et_2))).getText().toString();
59                 int n1=Integer.parseInt(num1);
60                 int n2=Integer.parseInt(num2);
61                 int sum=n1/n2;
62                 TextView tv_1=findViewById(R.id.tv_2);
63                 tv_1.setText("结果="+sum);
64             }
65         });
66     }
67 }

 

posted @ 2021-10-08 15:33  Lwk36  阅读(32)  评论(0)  编辑  收藏  举报