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;
/**
* 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:
<?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>
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。
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