目录:
#1. BroadcastReceiver 广播接收者
#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
#4. URL 网络文件下载
#5. 安装apk
#6. ContentProvider 内容提供者
#7. GPS 定位
#8. SIM 卡信息获取并发送报警短信
#9. ContentProvider 内容提供者
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;
}
}
<!-- 清单中声明，其中exported表示内容提供者被其他应用程序调用，在版本17以后默认为false，需手动设为true -->
<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)
转载于:https://www.cnblogs.com/lv-2012/p/3766780.html
