Android实现短信加密功能（发送加密短信、解密本地短信）

短信加密此类功能由于新手学习的需求量较小，所以在网上很少有一些简单的demo供新手参考。小编做到此处也是花了比较多的时间自我构思，具体的过程也是不过多描述了，讲一下demo的内容。

 

 

 

demo功能：

1、可以发送短信并且加密（通过改变string中的char）

2、能够查看手机中的短信

3、能够给收到的加密短信解密。

涉及到的知识点：

1、intent bundle传递

2、ContentResolver获取手机短信

3、listveiw与simpleAdapter

4、发送短信以及为发送短信设置要监听的广播

遇到的问题：

1、发送短信字符过长会导致发送失败

解决方法：设置发送每条短信为70个字以内。

原理：每条短信限制160字符以内，每个汉字是2个字符。平时我们发送短信几乎不限长度，是因为一旦超过了单条短信的长度，手机会自动分多条发送，然后接收方分多条接收后整合在一起显示。

代码：

MainActivity:

import android.app.Activity; 
import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
public class MainActivity extends Activity { 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 InitView(); 
 } 
 private void InitView() { 
 Button send=(Button)findViewById(R.id.bt_send); 
 Button receive=(Button)findViewById(R.id.bt_receive); 
 send.setOnClickListener(new View.OnClickListener() { 
  @Override 
  public void onClick(View view) { 
  Intent intent=new Intent(MainActivity.this,SendActivity.class); 
  startActivity(intent); 
  } 
 }); 
 receive.setOnClickListener(new View.OnClickListener() { 
  @Override 
  public void onClick(View view) { 
  Intent intent=new Intent(MainActivity.this,ReceiveActivity.class); 
  startActivity(intent); 
  } 
 }); 
 } 
} 

SendActivity:

import android.app.Activity; 
import android.app.PendingIntent; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.os.Bundle; 
import android.telephony.SmsManager; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 
 
public class SendActivity extends Activity { 
 private IntentFilter sendFilter; 
 private SendStatusReceiver sendStatusReceiver; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_send); 
 InitView(); 
 } 
 private void InitView() { 
 Button cancel = (Button) findViewById(R.id.cancel_edit); 
 Button send = (Button) findViewById(R.id.send_edit); 
 final EditText phone = (EditText) findViewById(R.id.phone_edit_text); 
 final EditText msgInput = (EditText) findViewById(R.id.content_edit_text); 
 //为发送短信设置要监听的广播 
 sendFilter = new IntentFilter(); 
 sendFilter.addAction("SENT_SMS_ACTION"); 
 sendStatusReceiver = new SendStatusReceiver(); 
 registerReceiver(sendStatusReceiver, sendFilter); 
 send.setOnClickListener(new View.OnClickListener() { 
  @Override 
  public void onClick(View v) { 
  Toast.makeText(SendActivity.this, "加密发送中，请稍后...", Toast.LENGTH_SHORT).show(); 
  //接收edittext中的内容,并且进行加密 
  //倘若char+8超出了表示范围，则把原字符发过去 
  String address = phone.getText().toString(); 
  String content = msgInput.getText().toString(); 
  String contents = ""; 
  for (int i = 0; i < content.length(); i++) { 
   try { 
   contents += (char) (content.charAt(i) + 8); 
   }catch (Exception e) { 
   contents += (char) (content.charAt(i)); 
   } 
  } 
  //Log.i("hahaha",contents); 
  //发送短信 
  //并使用sendTextMessage的第四个参数对短信的发送状态进行监控 
  SmsManager smsManager = SmsManager.getDefault(); 
  Intent sentIntent = new Intent("SENT_SMS_ACTION"); 
  PendingIntent pi = PendingIntent.getBroadcast( 
   SendActivity.this, 0, sentIntent, 0); 
  smsManager.sendTextMessage(address, null, 
   contents.toString(), pi, null); 
  } 
 }); 
 cancel.setOnClickListener(new View.OnClickListener() { 
  @Override 
  public void onClick(View view) { 
  finish(); 
  } 
 }); 
 } 
 class SendStatusReceiver extends BroadcastReceiver { 
 @Override 
 public void onReceive(Context context, Intent intent) { 
  if (getResultCode() == RESULT_OK) { 
  //发送成功 
  Toast.makeText(context, "Send succeeded", Toast.LENGTH_LONG) 
   .show(); 
  Intent intent1 = new Intent(SendActivity.this, ReceiveActivity.class); 
  startActivity(intent1); 
  finish(); 
  } else { 
  //发送失败 
  Toast.makeText(context, "Send failed", Toast.LENGTH_LONG) 
   .show(); 
  } 
 } 
 } 
 @Override 
 protected void onDestroy() { 
 super.onDestroy(); 
 //在Activity摧毁的时候停止监听 
 unregisterReceiver(sendStatusReceiver); 
 } 
} 

ReceiveActivity:

import android.app.Activity; 
import android.content.Intent; 
import android.database.Cursor; 
import android.net.Uri; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 
import java.text.SimpleDateFormat; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
public class ReceiveActivity extends Activity implements AdapterView.OnItemClickListener{ 
 private TextView Tv_address; 
 private TextView Tv_body; 
 private TextView Tv_time; 
 private ListView listview; 
 private List<Map<String, Object>> dataList; 
 private SimpleAdapter simple_adapter; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_receive); 
 InitView(); 
 } 
 @Override 
 protected void onStart() { 
 super.onStart(); 
 RefreshList(); 
 } 
 private void InitView() { 
 Tv_address = (TextView) findViewById(R.id.tv_address); 
 Tv_body = (TextView) findViewById(R.id.tv_body); 
 Tv_time = (TextView) findViewById(R.id.tv_time); 
 listview = (ListView) findViewById(R.id.list_receive); 
 dataList = new ArrayList<Map<String, Object>>(); 
 listview.setOnItemClickListener(this); 
 } 
 private void RefreshList() { 
 //从短信数据库读取信息 
 Uri uri = Uri.parse("content://sms/"); 
 String[] projection = new String[]{"address", "body", "date"}; 
 Cursor cursor = getContentResolver().query(uri, projection, null, null, "date desc"); 
 startManagingCursor(cursor); 
 //此处为了简化代码提高效率，仅仅显示20条最近短信 
 for (int i = 0; i < 20; i++) { 
  //从手机短信数据库获取信息 
  if(cursor.moveToNext()) { 
  String address = cursor.getString(cursor.getColumnIndex("address")); 
  String body = cursor.getString(cursor.getColumnIndex("body")); 
  long longDate = cursor.getLong(cursor.getColumnIndex("date")); 
  //将获取到的时间转换为我们想要的方式 
  SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); 
  Date d = new Date(longDate); 
  String time = dateFormat.format(d); 
  Map<String, Object> map = new HashMap<String, Object>(); 
  map.put("address", address); 
  map.put("body", body+"body"); 
  map.put("time", time+" time"); 
  dataList.add(map); 
  } 
 } 
 simple_adapter = new SimpleAdapter(this, dataList, R.layout.activity_receive_list_item, 
  new String[]{"address", "body", "time"}, new int[]{ 
  R.id.tv_address, R.id.tv_body, R.id.tv_time}); 
 listview.setAdapter(simple_adapter); 
 } 
 @Override 
 public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { 
 //获取listview中此个item中的内容 
 //content的内容格式如下 
 //{body=[B@43c2da70body, address=+8615671562394address, time=2015-12-24 11:55:50time} 
 String content = listview.getItemAtPosition(i) + ""; 
 String body = content.substring(content.indexOf("body=") + 5, 
  content.indexOf("body,")); 
 //Log.i("hahaha",body); 
 String address = content.substring(content.indexOf("address=") + 8, 
  content.lastIndexOf(",")); 
 //Log.i("hahaha",address); 
 String time = content.substring(content.indexOf("time=") + 5, 
  content.indexOf(" time}")); 
 //Log.i("hahaha",time); 
 //使用bundle存储数据发送给下一个Activity 
 Intent intent=new Intent(ReceiveActivity.this,ReceiveActivity_show.class); 
 Bundle bundle = new Bundle(); 
 bundle.putString("body", body); 
 bundle.putString("address", address); 
 bundle.putString("time", time); 
 intent.putExtras(bundle); 
 startActivity(intent); 
 } 
} 

ReceiveActivity_show:

import android.app.Activity; 
import android.os.Bundle; 
import android.widget.TextView; 
public class ReceiveActivity_show extends Activity { 
 private TextView Address_show; 
 private TextView Time_show; 
 private TextView Early_body_show; 
 private TextView Late_body_show; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_receive_show); 
 InitView(); 
 } 
 private void InitView() { 
 Address_show = (TextView) findViewById(R.id.address_show); 
 Time_show = (TextView) findViewById(R.id.time_show); 
 Early_body_show = (TextView) findViewById(R.id.early_body_show); 
 Late_body_show = (TextView) findViewById(R.id.late_body_show); 
 //接收内容和id 
 Bundle bundle = this.getIntent().getExtras(); 
 String body = bundle.getString("body"); 
 String time = bundle.getString("time"); 
 String address = bundle.getString("address"); 
 Address_show.setText(address); 
 Early_body_show.setText(body); 
 Time_show.setText(time); 
 //对短信消息进行解密后显示在textview中 
 //倘若char+8超出了表示范围，则直接按照原字符解析 
 String real_content = ""; 
 for (int i = 0; i < body.length(); i++) { 
  try { 
  char textchar=(char) (body.charAt(i) + 8); 
  real_content += (char) (body.charAt(i) - 8); 
  }catch (Exception e){ 
  real_content += (char) (body.charAt(i)); 
  } 
 } 
 Late_body_show.setText(real_content); 
 } 
} 

activity_main:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical"> 
 <TextView 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:background="#000" 
 android:padding="12dp" 
 android:text="加密短信" 
 android:textColor="#fff" 
 android:textSize="25sp" 
 android:textStyle="bold" /> 
 <Button 
 android:layout_marginTop="120dp" 
 android:id="@+id/bt_send" 
 android:layout_width="200dp" 
 android:layout_height="80dp" 
 android:text="发送加密短信" 
 android:layout_gravity="center" 
 android:textSize="20dp"/> 
 <Button 
 android:id="@+id/bt_receive" 
 android:layout_width="200dp" 
 android:layout_height="80dp" 
 android:layout_gravity="center" 
 android:text="解密本地短信" 
 android:textSize="20dp" 
 android:layout_below="@+id/bt_send"/> 
</LinearLayout> 

activity_send:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical"> 
 <LinearLayout 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical" 
 android:padding="10dp"> 
 <TextView 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:text="加密短信发送" 
  android:textColor="#000" 
  android:textSize="35sp" /> 
 <View 
  android:layout_width="match_parent" 
  android:layout_height="3dp" 
  android:layout_marginBottom="20dp" 
  android:background="#CECECE" /> 
 <TextView 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="5dp" 
  android:text="发送至：" 
  android:textSize="25sp" /> 
 <EditText 
  android:id="@+id/phone_edit_text" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="10dp" 
  android:background="@drawable/edit_text_style" 
  android:hint="接收人手机号码" 
  android:maxLength="15" 
  android:maxLines="1" 
  android:textSize="19sp" 
  android:singleLine="true" /> 
 <TextView 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="5dp" 
  android:text="发送内容" 
  android:textSize="25sp" /> 
 <EditText 
  android:id="@+id/content_edit_text" 
  android:layout_width="match_parent" 
  android:layout_height="0dp" 
  android:layout_weight="1" 
  android:background="@drawable/edit_text_style" 
  android:gravity="start" 
  android:hint="单条短信请保持在70字以内" 
  android:maxLength="70" 
  android:textSize="19sp" 
  /> 
 <LinearLayout 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:layout_margin="10dp"> 
  <Button 
  android:id="@+id/cancel_edit" 
  android:layout_width="0dp" 
  android:layout_height="wrap_content" 
  android:layout_weight="1" 
  android:text="取消编辑" 
  android:textSize="20sp" /> 
  <Button 
  android:id="@+id/send_edit" 
  android:layout_width="0dp" 
  android:layout_height="wrap_content" 
  android:layout_weight="1" 
  android:text="发 送" 
  android:textSize="20sp" /> 
 </LinearLayout> 
 </LinearLayout> 
</LinearLayout> 

activity_receive:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" android:layout_width="match_parent" 
 android:layout_height="match_parent"> 
 <TextView 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:padding="10dp" 
 android:text="所有短信" 
 android:textColor="#fff" 
 android:background="#000" 
 android:textSize="23sp" 
 android:textStyle="bold"/> 
 <ListView 
 android:id="@+id/list_receive" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent"></ListView> 
</LinearLayout> 

activity_receive_show:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical"> 
 <TextView 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:background="#000" 
 android:padding="12dp" 
 android:text="短信解密" 
 android:textColor="#fff" 
 android:textSize="25sp" 
 android:textStyle="bold" /> 
 <TableLayout 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical" 
 android:padding="10dp" 
 android:stretchColumns="1" 
 android:shrinkColumns="1"> 
 <TableRow android:layout_marginTop="10dp" 
  android:layout_width="match_parent" 
  > 
  <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="5dp" 
  android:text="号码：" 
  android:textColor="#000" 
  android:textSize="20sp" /> 
  <TextView 
  android:id="@+id/address_show" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="10dp" 
  android:background="@drawable/edit_text_style" 
  android:maxLines="1" 
  android:singleLine="true" 
  android:textSize="18sp" /> 
 </TableRow 
  > 
 <TableRow 
  android:layout_width="match_parent" 
  android:layout_marginBottom="10dp" 
  > 
  <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="5dp" 
  android:text="时间：" 
  android:textColor="#000" 
  android:textSize="20sp" /> 
  <TextView 
  android:id="@+id/time_show" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="10dp" 
  android:background="@drawable/edit_text_style" 
  android:maxLines="1" 
  android:textSize="18sp" /> 
 </TableRow> 
 <TableRow android:layout_marginBottom="10dp" 
  android:layout_width="match_parent"> 
  <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="5dp" 
  android:text="原文本：" 
  android:textColor="#000" 
  android:textSize="20sp" /> 
  <TextView 
  android:id="@+id/early_body_show" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:background="@drawable/edit_text_style" 
  android:minLines="6" 
  android:maxLines="6" 
  android:textSize="18sp" 
  /> 
 </TableRow> 
 <TableRow 
  android:layout_width="match_parent"> 
  <TextView 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:layout_marginBottom="5dp" 
  android:text="解析后：" 
  android:textColor="#000" 
  android:textSize="20sp" /> 
  <TextView 
  android:id="@+id/late_body_show" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content" 
  android:background="@drawable/edit_text_style" 
  android:minLines="6" 
  android:maxLines="6" 
  android:singleLine="false" 
  android:textSize="18sp" 
  /> 
 </TableRow> 
 </TableLayout> 
</LinearLayout> 

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