手机卫士笔记

1. BroadcastReceiver 广播接收者

每次广播到来时 , 会重新创建 BroadcastReceiver 对象 , 并且调用 onReceive() 方法 , 执行完以后 , 该对象即被销毁 . 当 onReceive() 方法在 10 秒内没有执行完毕， Android 会认为该程序无响应 . 所以在BroadcastReceiver 里不能做一些比较耗时的操作 , 否侧会弹出 ANR(Application NoResponse) 的对话框 .

如果需要完成一项比较耗时的工作 , 应该通过发送 Intent 给 Service, 由 Service 来完成 . 这里不能使用子线程来解决 , 因为 BroadcastReceiver 的生命周期很短 , 子线程可能还没有结束BroadcastReceiver 就先结束了 .BroadcastReceiver 一旦结束 , 此时 BroadcastReceiver 的所在进程很容易在系统需要内存时被优先杀死 , 因为它属于空进程 ( 没有任何活动组件的进程 ). 如果它的宿主进程被杀死 , 那么正在工作的子线程也会被杀死 . 所以采用子线程来解决是不可靠的 .

第一种方式： (此方式程序退出也会持续的接收广播)

//实现
public class MyReceiver extends BroadcastReceiver {
    private String tag="MyReceiver";
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Log.i(tag, intent.getAction());
    }
}

清单中配置
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
  <receiver android:name=".MyReceiver">
            <intent-filter >
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            </intent-filter>
        </receiver>

第二种方式：(此方式程序退出则终止接收)

//注册
IntentFilter filter = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
registerReceiver(mBroadcastReceiver, filter);

//广播接受者
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i(tag, "代码注册"+intent.getAction());

}};

//取消注册建议在onPuase()中执行
unregisterReceiver(mBroadcastReceiver);

发送广播

//注册
IntentFilter filter = new IntentFilter("cn.lt.MYRECEIVER");
registerReceiver(mBroadcastReceiver, filter);

//广播接受者
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i(tag, "代码注册"+intent.getAction());

}};

//发送广播
Intent intent = new Intent();
intent.setAction("cn.lt.MYRECEIVER");
sendBroadcast(intent);

BroadCastReceiver 的 API

abortBroadcast()
这个方法可以截获由 sendOrderedBroadcast() 发送来的广播，让其它广播接收者无法收到这个广播
clearAbortBroadcast()
这个方法是针对 abortBroadcast() 方法，用于取消截获广播。这样它的下一级广播接收者就能够收到该广播了
getAbortBroadcast()
是否终止广播, true终止

2. SharedPreferences (存储在应用程序data/data/包/shared_prefs/目录下,以xml格式保存)

//获取SharedPreferences对象
SharedPreferences preferences = getSharedPreferences("CONFIG", Context.MODE_PRIVATE);
//存储数据
Editor editor = preferences.edit();
editor.putString("name", "luv");
editor.commit(); //提交
//得到数据
String mString = preferences.getString("name", "");

3. 数据库使用 (存储在应用程序data/data/包/databases/目录下)

public class MySqlHelper extends SQLiteOpenHelper {
    /**
     *
     * @param context 上下文
     * @param name 数据库名
     * @param factory 缺省为null
     * @param version 数据库版本
     */
    public MySqlHelper(Context context, String name, CursorFactory factory,
            int version) {
        super(context, name, factory, version);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE person (_id integer primary key autoincrement, name varchar(30))");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}

//表操作实现类
public class PersonDao {
    private String tag = "PersonDao";
    private MySqlHelper sqlHelper;

    public PersonDao(Context context) {
        sqlHelper = new MySqlHelper(context, "person.db", null, 1);
    }

    public void add(String name) {
        SQLiteDatabase  db = sqlHelper.getReadableDatabase();
        if (db.isOpen()) {
            db.execSQL("insert into person (name) values(?)", new Object[]{name});
            db.close();
        }
    }
    public void all() {
        SQLiteDatabase  db = sqlHelper.getReadableDatabase();
        if (db.isOpen()) {
            Cursor cursor = db.rawQuery("select name from person ", null);
            while (cursor.moveToNext()) {
                Log.i(tag, cursor.getString(0));
            }
            db.close();
        }
    }
}

//创建PersonDao实现
private PersonDao personDao;
personDao = new PersonDao(this);
personDao.add("luv");
personDao.all();

4. URL 网络文件下载

URL url = new URL("http://192.168.1.104:8080/newapk.apk");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(5000);
conn.setRequestMethod("GET");
if (conn.getResponseCode() == 200) {
    //得到文件长度
    int total = conn.getContentLength();
    pdDialog.setMax(total);
    InputStream is = conn.getInputStream();
    File file = new File(filePath);
    FileOutputStream fos = new FileOutputStream(file);
    byte[] buffer = new byte[1024];
    int len;
    int process = 0;
    while ((len = is.read(buffer))!= -1) {
        fos.write(buffer,0, len);
        process += len;
        pdDialog.setProgress(process);
    }
    fos.flush();
    fos.close();
    is.close();
    return file;
}

5. 安装apk

Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
//file -> apk 文件
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
startActivity(intent);

6. ContentProvider 内容提供者

//创建提供者
public class PersonDBProvider extends ContentProvider {
    //定义一个uri的匹配器用于匹配uri，如果路径不满足返回-1
    private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
    private static final int INSERT = 1;
    private static final int DELETE = 2;
    private static final int UPDATE = 3;
    private static final int QUERY = 4;

    static {
        //添加匹配规则
        matcher.addURI("cn.lt.personprovider", "insert", INSERT);
        matcher.addURI("cn.lt.personprovider", "delete", DELETE);
        matcher.addURI("cn.lt.personprovider", "update", UPDATE);
        matcher.addURI("cn.lt.personprovider", "query", QUERY);
    }
    private MySqlHelper sqlHelper;
    @Override
    public boolean onCreate() {
        // TODO Auto-generated method stub
        sqlHelper = new MySqlHelper(getContext(), "person.db", null, 1);
        return false;
    }
    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {
        if (matcher.match(uri)==QUERY) {
            SQLiteDatabase db = sqlHelper.getReadableDatabase();
            return db.query("person", projection, selection, selectionArgs, null, null, sortOrder);
        } else {
            throw new IllegalArgumentException("查询路径不合法");
        }
    }
    @Override
    public String getType(Uri uri) {
        return null;
    }
    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }
    @Override
    public int update(Uri uri, ContentValues values, String selection,
            String[] selectionArgs) {
        return 0;
    }
}


<provider
     android:name=".PersonDBProvider"
     android:authorities="cn.lt.personprovider"
     android:exported="true" />

//创建一个新的Android程序,获取到上面程序中提供的数据
ContentResolver resolver = getContentResolver();
Uri uri = Uri.parse("content://cn.lt.personprovider/query");
Cursor cursor = resolver.query(uri, null, null, null, null);
while (cursor.moveToNext()) {
    Log.i(tag , cursor.getString(0));
}

7. GPS 定位

// 获取位置管理服务
LocationManager locationManager;
String serviceName = Context.LOCATION_SERVICE;
locationManager = (LocationManager) this.getSystemService(serviceName);
// 查找到服务信息
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE); // 高精度
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_HIGH); // 低功耗
String provider = locationManager.getBestProvider(criteria, true); // 获取GPS信息
Location location = locationManager.getLastKnownLocation(provider); // 获取最后的位置
updateToNewLocation(location);
// 设置监听器，自动更新的最小时间为间隔1000*10毫秒, 最小位移变化超过1000米
locationManager.requestLocationUpdates(provider, 10*1000 , 1000,
        new MyLocationListener());

//监听器
private class MyLocationListener implements LocationListener {
    @Override
    public void onLocationChanged(Location location) {
        double  latitude = location.getLatitude();
        double longitude= location.getLongitude();
        String ss = "纬度：" +  latitude+ " 经度" + longitude;
        tView.setText(ss);
    }
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
    @Override
    public void onProviderEnabled(String provider) {
    }
    @Override
    public void onProviderDisabled(String provider) {
}
}

//获取最后的位置
private void updateToNewLocation(Location location) {
    if (location != null) {
        double  latitude = location.getLatitude();
        double longitude= location.getLongitude();
        String ss = "纬度：" +  latitude+ " 经度" + longitude;
        tView.setText(ss);
    } else {
        tView.setText("无法获取地理信息");
    }
}

8. SIM 卡信息获取并发送报警短信

TelephonyManager manager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
String currentsim =  manager.getSimSerialNumber();
String realsim = sp.getString("sim", "");
if(!currentsim.equals(realsim)){ //sim 卡串号不同
    // 发送报警短信
    Log.i(TAG,"发送报警短信");
    SmsManager smsmanager = SmsManager.getDefault();
    String destinationAddress =    sp.getString("safenumber", "");
    smsmanager.sendTextMessage(destinationAddress, null, "sim卡发生了改变,手机可能被盗", null, null);
}

9. ContentProvider 内容提供者

提供统一的接口向其他应用程序提供数据, 其数据操作类似于操作数据库.
先看如何使用:
getContentResolver().insert(Uri.parse("content://cn.luv.mydata.provider/insert"), values);
分析:

A 标准前缀
B 内容提供者标识, 在Mainnifeset.xml 中声明的: <provider android:authorities="cn.luv.mydata.provider"></provider>
C 子路径, 其在contentprovider 中定义: matcher.addURI("cn.itcast.applockprovider", "insert", INSERT);

在执行上面操作时,将调用到contentprovider 中的重载insert函数:
public Uri insert(Uri uri, ContentValues values) {
        int result = matcher.match(uri);
        if (result == INSERT) {
  //do ....
        } else {
            throw new IllegalArgumentException("uri地址不正确");
        }
        return null;
    }
此函数中的matcher 定义如下:
private static final int INSERT = 10;
private static final int DELETE = 11;
private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
static {
     matcher.addURI("cn.itcast.applockprovider", "insert", INSERT);
     matcher.addURI("cn.itcast.applockprovider", "delete", DELETE);
}
//1.
public class MyProvider extends ContentProvider {
    private static final int INSERT = 10;
    private static final int DELETE = 11;
    private static UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
    static {//t添加uri
        matcher.addURI("cn.luv.mydata.provider", "insert", INSERT); //插入uri
        matcher.addURI("cn.luv.mydata.provider", "delete", DELETE); //删除uri
    }
    //本地数据库实例
    private PersonDao dao;
    @Override
    public boolean onCreate() {
        dao = new PersonDao(getContext());
        return false;
    }
    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {
        return null;
    }
    @Override
    public String getType(Uri uri) {
        return null;
    }
    @Override
    public Uri insert(Uri uri, ContentValues values) {
        int result = matcher.match(uri);
        if (result == INSERT) {    //插入到数据库中
            dao.add(values.getAsString("name"));
  //通知内容观察者
//getContext().getContentResolver().notifyChange(Uri.parse("content://cn.luv.mydata.provider/haha"), null);
        } else {
            throw new IllegalArgumentException("uri地址不正确");
        }
        return null;
    }
    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }
    @Override
    public int update(Uri uri, ContentValues values, String selection,
            String[] selectionArgs) {
        return 0;
    }
}

//数据库dao
public class PersonDao {
    private String tag = "PersonDao";
    private MySqlHelper sqlHelper;
    public PersonDao(Context context) {
        sqlHelper = new MySqlHelper(context, "person.db", null, 1);
    }
    //插入一条数据
    public void add(String name) {
        SQLiteDatabase  db = sqlHelper.getReadableDatabase();
        if (db.isOpen()) {
            db.execSQL("insert into person (name) values(?)", new Object[]{name});
            db.close();
        }
    }
    public void all() {
        SQLiteDatabase  db = sqlHelper.getReadableDatabase();
        if (db.isOpen()) {
            Cursor cursor = db.rawQuery("select name from person ", null);
            while (cursor.moveToNext()) {
                Log.i(tag, cursor.getString(0));
            }
            db.close();
        }
    }
}

public class MySqlHelper extends SQLiteOpenHelper {
    public MySqlHelper(Context context, String name, CursorFactory factory,
            int version) {
        super(context, name, factory, version);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE person (_id integer primary key autoincrement, name varchar(30))");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    }
}
顺便提下内容观察者, 在上面的内容提供者中, 我们可以通过注册一个内容观察者来监听数据库中数据的变化,实现如下:
在MainActivity.java 中注册观察者
getContentResolver().registerContentObserver(Uri.parse("content://cn.luv.mydata.provider/haha"), true, new MyObserver(new Handler()));
在ContentProvider 中通知观察者
getContext().getContentResolver().notifyChange(Uri.parse("content://cn.luv.mydata.provider/haha"), null);

MyObserver 实现:
public class MyObserver extends ContentObserver {
    @Override
    public void onChange(boolean selfChange) {
        // TODO Auto-generated method stub
        super.onChange(selfChange);
        Log.i(TAG, "数据库有变化.....");
    }
    public MyObserver(Handler handler) {
        super(handler);
    }
}

来自为知笔记(Wiz)

posted @ 2014-06-04 00:43 旅行的蜗牛阅读(218) 评论(0) 编辑收藏举报

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手机卫士笔记

目录:

1. BroadcastReceiver 广播接收者

第一种方式： (此方式程序退出也会持续的接收广播)

第二种方式：(此方式程序退出则终止接收)

发送广播

BroadCastReceiver 的 API

abortBroadcast()

这个方法可以截获由 sendOrderedBroadcast() 发送来的广播，让其它广播接收者无法收到这个广播

clearAbortBroadcast()

这个方法是针对 abortBroadcast() 方法，用于取消截获广播。这样它的下一级广播接收者就能够收到该广播了

getAbortBroadcast()

是否终止广播, true终止

2. SharedPreferences (存储在应用程序data/data/包/shared_prefs/目录下,以xml格式保存)

3. 数据库使用 (存储在应用程序data/data/包/databases/目录下)

4. URL 网络文件下载

5. 安装apk

6. ContentProvider 内容提供者

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