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);
}
}
