Android实现短信加密功能（发送加密短信、解密本地短信）

摘要：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...

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。

Android实现短信加密功能（发送加密短信、解密本地短信）1

Android实现短信加密功能（发送加密短信、解密本地短信）2

Android实现短信加密功能（发送加密短信、解密本地短信）3

Android实现短信加密功能（发送加密短信、解密本地短信）4

Android实现短信加密功能（发送加密短信、解密本地短信）5

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：

Android实现短信加密功能（发送加密短信、解密本地短信）6

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; /** * Created by 佳佳 on 2015/12/21. */ 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:

activity_send:

<"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:

<"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:

<"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>

以上就是本文的全部内容，android实现短信加密，实现发送加密短信、解密本地短信，希望对大家的学习有所帮助。