Android Studio学习路程（11）

今天没有学习新的知识，把前面所学的复习了一下，今天做了一个简单的记账APP，实现了它的登录和界面之间的跳转的功能。下面是一些代码，我还没有做完。

  1 package com.example.hp.jizhang;
  2 
  3 import android.content.Context;
  4 import android.content.Intent;
  5 import android.content.SharedPreferences;
  6 import android.support.v7.app.ActionBarActivity;
  7 import android.os.Bundle;
  8 import android.text.Editable;
  9 import android.text.TextWatcher;
 10 import android.util.Log;
 11 import android.view.View;
 12 import android.widget.CheckBox;
 13 import android.widget.CompoundButton;
 14 import android.widget.EditText;
 15 
 16 public class MainActivity extends ActionBarActivity implements View.OnClickListener {
 17     private EditText mEtPhone;
 18     private EditText mEtPasswd;
 19     private CheckBox mCBPsd;
 20     private String TAG ="MainActivity";
 21     private String SP_PHONE = "sp_phone";
 22     private String SP_PASSWD = "sp_passwd";
 23     private String SP_IS_REMEMBER_PSD = "sp_is_remember_psd";
 24     private SharedPreferences sharedPreferences;
 25     private boolean mIsChecked=false;
 26 
 27     @Override
 28     protected void onCreate(Bundle savedInstanceState) {
 29         super.onCreate(savedInstanceState);
 30         setContentView(R.layout.activity_main);
 31 
 32         //初始化控件
 33         initUI();
 34         //初始化数据
 35         initData();
 36     }
 37 
 38     private void initData() {
 39         //实例化sharedPreferences对象
 40         if(sharedPreferences==null){
 41             sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
 42         }
 43         //回显数据
 44         mEtPhone.setText(sharedPreferences.getString(SP_PHONE,""));
 45         mEtPasswd.setText(sharedPreferences.getString(SP_PASSWD,""));
 46         mCBPsd.setChecked(mIsChecked);
 47     }
 48 
 49     private void initUI() {
 50         //获取登录按钮
 51         findViewById(R.id.btn_denglu).setOnClickListener(this);
 52         //获取电话和密码输入框
 53         mEtPhone = (EditText) findViewById(R.id.et_phone);
 54         //文本改变之后记录电话
 55         mEtPhone.addTextChangedListener(new TextWatcher() {
 56             @Override
 57             public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 58 
 59             }
 60 
 61             @Override
 62             public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 63 
 64             }
 65 
 66             @Override
 67             public void afterTextChanged(Editable editable) {
 68                 if(mIsChecked){
 69                     if(sharedPreferences==null){
 70                         sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
 71                     }
 72                     SharedPreferences.Editor edit = sharedPreferences.edit();
 73                     edit.putString(SP_PHONE, mEtPhone.getText().toString());
 74                     edit.commit();
 75                 }
 76             }
 77         });
 78         mEtPasswd = (EditText) findViewById(R.id.et_passwd);
 79         mEtPasswd.addTextChangedListener(new TextWatcher() {
 80             @Override
 81             public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 82 
 83             }
 84 
 85             @Override
 86             public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
 87 
 88             }
 89 
 90             @Override
 91             public void afterTextChanged(Editable editable) {
 92                 if(mIsChecked){
 93                     if(sharedPreferences==null){
 94                         sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
 95                     }
 96                     SharedPreferences.Editor edit = sharedPreferences.edit();
 97                     edit.putString(SP_PASSWD, mEtPasswd.getText().toString());
 98                     edit.commit();
 99                 }
100             }
101         });
102         //获取多选按钮
103         mCBPsd = (CheckBox) findViewById( R.id.cb_remember_psd);
104         mCBPsd.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
105             @Override
106             public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
107                 Log.d(TAG, "状态为：" + isChecked);
108                 mIsChecked = isChecked;
109                 if (isChecked) {
110                     //实例化SharedPreferences对象
111                     if (sharedPreferences == null) {
112                         sharedPreferences = getApplicationContext().getSharedPreferences("config", Context.MODE_PRIVATE);
113                     }
114                     //实例化SharedPreferences的编辑者对象
115                     SharedPreferences.Editor edit = sharedPreferences.edit();
116                     edit.putString(SP_PHONE, mEtPhone.getText().toString());
117                     edit.putString(SP_PASSWD, mEtPasswd.getText().toString());
118                     edit.putBoolean(SP_IS_REMEMBER_PSD, isChecked);
119                     //提交
120                     edit.commit();
121 
122 
123                 }
124             }
125         });
126     }
127     //获取到登录按钮后用intent方法跳转到下一个界面
128     @Override
129     public void onClick(View view) {
130         Intent intent = new Intent();
131         switch (view.getId()){
132             case R.id.btn_denglu:
133 
134                 //跳转到第一个界面
135                 intent.setClass(getApplicationContext(),FirstActivity.class);
136                 break;
137         }
138         startActivity(intent);
139     }
140 }

 1 package com.example.hp.jizhang;
 2 
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.view.View;
 7 
 8 /**
 9  * Created by hp on 2020/2/16.
10  */
11 public class FirstActivity extends ActionBarActivity implements View.OnClickListener {
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14 
15         setContentView(R.layout.activity_first);
16 
17         //初始化控件
18         initUI();
19     }
20 
21     private void initUI() {
22         //获取控件的id
23         findViewById(R.id.tv_income_month);//获取“月收入”
24         findViewById(R.id.tv_output_month);//获取“月支出”
25         findViewById(R.id.tv_balance);   //获取“余额”
26         findViewById(R.id.btn_add_one).setOnClickListener(this);   //获取按钮“记一笔”
27 
28     }
29 
30 
31     @Override
32     public void onClick(View view) {
33         Intent intent = new Intent();
34         switch (view.getId()){
35             case R.id.btn_add_one:
36                 //点击“记一笔”按钮跳转到第二个界面
37                 intent.setClass(getApplicationContext(),SecondActivity.class);
38                 break;
39         }
40         startActivity(intent);
41     }
42 }

 1 package com.example.hp.jizhang;
 2 
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.view.View;
 7 
 8 /**
 9  * Created by hp on 2020/2/16.
10  */
11 public class SecondActivity extends ActionBarActivity implements View.OnClickListener {
12     protected void onCreate(Bundle savedInstanceState) {
13         super.onCreate(savedInstanceState);
14 
15         setContentView(R.layout.activity_second);
16         //初始化控件
17         initUI();
18     }
19 
20     private void initUI() {
21         findViewById(R.id.btn_secondActivity_return).setOnClickListener(this);
22     }
23 
24     @Override
25     public void onClick(View view) {
26         Intent intent = new Intent();
27         switch (view.getId()){
28             case R.id.btn_secondActivity_return:
29                 //按返回按钮跳转到第一个界面
30                 intent.setClass(getApplicationContext(),FirstActivity.class);
31                 break;
32             //按收入按钮跳转到第三个界面
33             case R.id.btn_income:
34                 intent.setClass(getApplicationContext(),ThirdActivity.class);
35             case R.id.btn_output:
36                 intent.setClass(getApplicationContext(),FouthActivity.class);
37         }
38         startActivity(intent);
39     }
40 }

 1 package com.example.hp.jizhang;
 2 
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.view.View;
 7 
 8 import com.example.hp.jizhang.entity.User;
 9 
10 /**
11  * Created by hp on 2020/2/16.
12  */
13 public class ThirdActivity extends ActionBarActivity implements View.OnClickListener {
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16 
17         setContentView(R.layout.activity_third);
18         //初始化控件
19         initUI();
20         //初始化数据
21         initData();
22 
23     }
24 
25     private void initData() {
26         User user = new User();
27     }
28 
29     private void initUI() {
30         findViewById(R.id.btn_thirdActivity_return).setOnClickListener(this);
31     }
32     @Override
33     public void onClick(View view) {
34         Intent intent = new Intent();
35         switch (view.getId()){
36             case R.id.btn_thirdActivity_return:
37                 //跳转到第二个界面
38                 intent.setClass(getApplicationContext(),SecondActivity.class);
39                 break;
40         }
41         startActivity(intent);
42 
43     }
44 }

 1 package com.example.hp.jizhang;
 2 
 3 import android.content.Intent;
 4 import android.os.Bundle;
 5 import android.support.v7.app.ActionBarActivity;
 6 import android.view.View;
 7 
 8 /**
 9  * Created by hp on 2020/2/16.
10  */
11 public class FouthActivity extends ActionBarActivity implements View.OnClickListener {
12 
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15 
16         setContentView(R.layout.activity_fouth);
17         //初始化控件
18         initUI();
19 
20     }
21 
22     private void initUI() {
23         findViewById(R.id.btn_fouthActivity_return).setOnClickListener(this);
24     }
25 
26     @Override
27     public void onClick(View view) {
28         Intent intent = new Intent();
29         switch (view.getId()){
30             case R.id.btn_fouthActivity_return:
31                 //跳转到第二个界面
32                 intent.setClass(getApplicationContext(),SecondActivity.class);
33                 break;
34         }
35         startActivity(intent);
36     }
37 }

下面是一些布局文件：

 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     android:paddingBottom="@dimen/activity_vertical_margin"
 8     android:paddingLeft="@dimen/activity_horizontal_margin"
 9     android:paddingRight="@dimen/activity_horizontal_margin"
10     android:paddingTop="@dimen/activity_vertical_margin"
11     tools:context="com.example.hp.jizhang.MainActivity">
12 
13     <EditText
14         android:id="@+id/et_phone"
15         android:inputType="phone"
16         android:hint="电话:"
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content" />
19 
20     <EditText
21         android:id="@+id/et_passwd"
22         android:inputType="textPassword"
23         android:hint="密码:"
24         android:layout_width="match_parent"
25         android:layout_height="wrap_content" />
26     <CheckBox
27         android:id="@+id/cb_remember_psd"
28         android:text="记住账户"
29         android:layout_width="wrap_content"
30         android:layout_height="wrap_content" />
31 
32     <Button
33         android:id="@+id/btn_denglu"
34         android:text="登录"
35         android:layout_width="match_parent"
36         android:layout_height="wrap_content" />
37 
38 
39 
40 
41 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout 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:paddingTop="@dimen/activity_vertical_margin"
 7     tools:context="com.example.hp.jizhang.FirstActivity">
 8 
 9 
10     <TextView
11         android:id="@+id/tv_income_month"
12         android:layout_width="match_parent"
13         android:layout_height="50dp"
14         android:textSize="30dp"
15         android:text="    本月收入：3000"
16         android:background="@android:color/background_light"
17         android:layout_alignParentTop="true"
18         android:layout_alignParentLeft="true"
19         android:layout_alignParentStart="true"
20         android:layout_marginTop="59dp"/>
21 
22     <TextView
23         android:id="@+id/tv_output_month"
24         android:layout_width="match_parent"
25         android:layout_height="50dp"
26         android:textSize="30dp"
27         android:text="     本月支出：2000"
28         android:background="@android:color/background_light"
29         android:layout_centerVertical="true"
30         android:layout_alignParentLeft="true"
31         android:layout_alignParentStart="true"/>
32 
33     <TextView
34         android:id="@+id/tv_balance"
35         android:layout_width="match_parent"
36         android:layout_height="50dp"
37         android:textSize="30dp"
38         android:text="      本月余额：1000"
39         android:background="@android:color/background_light"
40         android:layout_above="@id/btn_add_one"
41         android:layout_alignParentLeft="true"
42         android:layout_alignParentStart="true"
43         android:layout_marginBottom="66dp"/>
44 
45     <Button
46         android:id="@+id/btn_add_one"
47         android:layout_width="match_parent"
48         android:layout_height="70dp"
49         android:text="  +  记一笔"
50         android:textSize="40dp"
51         android:layout_alignParentBottom="true"
52         android:layout_alignParentLeft="true"
53         android:layout_alignParentStart="true"
54         android:layout_marginBottom="47dp"/>
55 
56 </RelativeLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout 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:background="#000000"
 7     android:padding="@dimen/activity_vertical_margin"
 8     tools:context="com.example.hp.jizhang.SecondActivity">
 9 
10 
11     <Button
12         android:id="@+id/btn_secondActivity_return"
13         android:layout_width="80dp"
14         android:layout_height="50dp"
15         android:text="返回"
16         android:layout_alignParentTop="true"
17         android:layout_alignParentLeft="true"
18         android:layout_alignParentStart="true" />
19     <EditText
20         android:id="@+id/et_put_money"
21         android:layout_width="match_parent"
22         android:layout_height="40dp"
23         android:textColor="#870c0c"
24         android:hint="请输入金额："
25         android:background="#9bc9e1"
26         android:textSize="20dp"
27         android:layout_marginTop="44dp"
28         android:layout_below="@id/tv_money"
29         android:layout_alignParentLeft="true"
30         android:layout_alignParentStart="true" />
31     <TextView
32         android:id="@+id/tv_money"
33         android:layout_width="match_parent"
34         android:layout_height="40dp"
35         android:text="金额"
36         android:textColor="#f9f6f6"
37         android:textSize="20dp"
38         android:layout_marginTop="35dp"
39         android:layout_below="@id/btn_secondActivity_return"
40         android:layout_alignParentLeft="true"
41         android:layout_alignParentStart="true"/>
42 
43     <Button
44         android:id="@+id/btn_output"
45         android:layout_width="match_parent"
46         android:layout_height="70dp"
47         android:text="支出"
48         android:textColor="#f04b4b"
49         android:layout_alignParentBottom="true"
50         android:layout_alignParentLeft="true"
51         android:layout_alignParentStart="true" />
52     <Button
53         android:id="@+id/btn_income"
54         android:layout_width="match_parent"
55         android:layout_height="60dp"
56         android:text="收入"
57         android:textColor="#6597ed"
58         android:layout_above="@id/btn_output"
59         android:layout_alignParentLeft="true"
60         android:layout_alignParentStart="true"
61         android:layout_marginBottom="45dp" />
62 
63 
64 </RelativeLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout 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:padding="@dimen/activity_vertical_margin"
 7     tools:context="com.example.hp.jizhang.ThirdActivity">
 8 
 9     <Button
10         android:id="@+id/btn_thirdActivity_return"
11         android:layout_width="80dp"
12         android:layout_height="50dp"
13         android:text="返回"
14         android:layout_alignParentTop="true"
15         android:layout_alignParentLeft="true"
16         android:layout_alignParentStart="true" />
17     <TextView
18         android:id="@+id/tv_income_all"
19         android:layout_width="match_parent"
20         android:layout_height="40dp"
21         android:text="收入总额："
22         android:textColor="#726f6f"
23         android:textSize="30dp"
24         android:background="#000000"
25         android:layout_below="@id/btn_thirdActivity_return"
26         android:layout_alignParentRight="true"
27         android:layout_alignParentEnd="true"
28         android:layout_marginTop="31dp"/>
29     <EditText
30         android:id="@+id/et_income_money"
31         android:layout_width="match_parent"
32         android:layout_height="100dp"
33         android:textColor="#870c0c"
34         android:hint="收入金额（￥）："
35         android:layout_below="@id/tv_income_all"
36         android:layout_alignParentLeft="true"
37         android:layout_alignParentStart="true"
38         android:layout_marginTop="41dp" />
39 
40     <EditText
41         android:id="@+id/et_income_nature"
42         android:layout_width="match_parent"
43         android:layout_height="100dp"
44         android:textColor="#870c0c"
45         android:hint="收入类型："
46         android:layout_marginBottom="35dp"
47         android:layout_alignParentBottom="true"
48         android:layout_alignParentRight="true"
49         android:layout_alignParentEnd="true" />
50 
51 </RelativeLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout 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:padding="@dimen/activity_vertical_margin"
 7     tools:context="com.example.hp.jizhang.FouthActivity">
 8 
 9     <Button
10         android:id="@+id/btn_fouthActivity_return"
11         android:layout_width="80dp"
12         android:layout_height="50dp"
13         android:text="返回"
14         android:layout_alignParentTop="true"
15         android:layout_alignParentLeft="true"
16         android:layout_alignParentStart="true" />
17 
18     <TextView
19         android:id="@+id/tv_output_all"
20         android:layout_width="match_parent"
21         android:layout_height="40dp"
22         android:text="支出总额："
23         android:textColor="#726f6f"
24         android:textSize="30dp"
25         android:background="#000000"
26         android:layout_below="@id/btn_fouthActivity_return"
27         android:layout_alignParentLeft="true"
28         android:layout_alignParentStart="true"
29         android:layout_marginTop="71dp"/>
30     <EditText
31         android:id="@+id/et_output_money"
32         android:layout_width="match_parent"
33         android:layout_height="100dp"
34         android:textColor="#870c0c"
35         android:hint="支出金额（￥）："
36         android:layout_below="@id/tv_output_all"
37         android:layout_alignParentLeft="true"
38         android:layout_alignParentStart="true"
39         android:layout_marginTop="32dp" />
40 
41     <EditText
42         android:id="@+id/et_output_nature"
43         android:layout_width="match_parent"
44         android:layout_height="100dp"
45         android:textColor="#870c0c"
46         android:hint="支出类型："
47         android:layout_marginBottom="50dp"
48         android:layout_alignParentBottom="true"
49         android:layout_alignParentLeft="true"
50         android:layout_alignParentStart="true" />
51 
52 
53 
54 
55 </RelativeLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.hp.jizhang">
 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         <activity android:name=".FirstActivity">
19 
20         </activity>
21         <activity android:name=".SecondActivity">
22 
23         </activity>
24         <activity android:name=".ThirdActivity">
25 
26         </activity>
27         <activity android:name=".FouthActivity">
28 
29         </activity>
30     </application>
31 
32 </manifest>

 

来源：https://www.cnblogs.com/mxk123456/p/12319387.html