服務(wù)

1. Service創(chuàng)建：

2. 創(chuàng)建類并繼承Service類
3. 重寫onCreate()总棵、onStartCommand()、onDestroy()方法
4. 在Activity中調(diào)用startService(new Intent(MusicServiceActivity.this, MusicService.class));和stopService(new Intent(MusicServiceActivity.this, MusicService.class));啟動(dòng)和停止Service改含。
5. 在AndroidManifest注冊(cè)<service android:name=".MusicService"/>情龄。

6. Bound Service創(chuàng)建：

BoundService和Service的區(qū)別：BoundService可以通過(guò)get到的Service對(duì)象與Service進(jìn)行數(shù)據(jù)溝通。

1. 創(chuàng)建 ServiceConnection對(duì)象并重寫方法

private ServiceConnection mServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            MusicService.LocalBinder binder = (MusicService.LocalBinder) service;
            mMusicService = binder.getService();
        }
        @Override
        public void onServiceDisconnected(ComponentName name) {
        }
};

2. 將ServiceConnection對(duì)象傳給bindService()

bindService(new Intent(MusicServiceActivity.this, MusicService.class), mServiceConnection, BIND_AUTO_CREATE);

3. 在Service內(nèi)創(chuàng)建一個(gè)內(nèi)部類并繼承Binder捍壤，定義一個(gè)方法返回本Service對(duì)象骤视，并在onBind()方法中返回內(nèi)部類對(duì)象。

@Nullable
@Override
public IBinder onBind(Intent intent) {
        // 返回給ServiceConnection對(duì)象的onServiceConnected()內(nèi)
        return new LocalBinder();
}
public class LocalBinder extends Binder{
        // 獲取當(dāng)前Service
        MusicService getService(){
        return MusicService.this;
    }

3. IntentService

廣播（BroadcastReceiver）

1. BroadcastReceiver兩種注冊(cè)方式：

2. 靜態(tài)注冊(cè)鹃觉，在Manifest中注冊(cè)：

<receiver android:name=".TestBroadcastReceiver">
        <intent-filter>
            <action android:name="com.example.hx.demo.broadcast"/>
        </intent-filter>
</receiver>

2.動(dòng)態(tài)注冊(cè)专酗，創(chuàng)建一個(gè)Activity：

public class SendBroadcastActivity extends AppCompatActivity {
    private Button mButton;
    private TestBroadcastReceiver mTestBroadcastReceiver = new TestBroadcastReceiver();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_send_broadcast);
        setTitle(getIntent().getStringExtra("appName"));
        mButton = (Button) findViewById(R.id.send_broadcast);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("com.example.hx.demo.broadcast");
                intent.putExtra("toast", "this is my toast of brodcast");
                sendBroadcast(intent);
            }
        });
    }
    @Override
    protected void onStart() {
        super.onStart();
        // 動(dòng)態(tài)注冊(cè)廣播
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("com.example.hx.demo.broadcast");
        registerReceiver(mTestBroadcastReceiver, intentFilter);
    } 
   @Override
    protected void onStop() {
        super.onStop();
        // 反注冊(cè)
        unregisterReceiver(mTestBroadcastReceiver);
    }
}

2. 在廣播接受端：

public class TestBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 不能做耗時(shí)操作，ANR
        if (intent != null) {
            if (TextUtils.equals(intent.getAction(), "com.example.hx.demo.broadcast")){
                Toast.makeText(context, intent.getStringExtra("toast"), Toast.LENGTH_SHORT).show();
            }
        }
    }
}

1.有序性廣播：sendOrderedBroadcast();
2.本地廣播：LocalBroadcastManager

WebView

1.使用之前需要獲取聯(lián)網(wǎng)權(quán)限盗扇。
2.加載線上url或本地html
3.和JS進(jìn)行交互祷肯、歷史記錄、導(dǎo)航......

public class WebViewActivity extends AppCompatActivity {
    private WebView mWebView;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_web_view);
        setTitle(getIntent().getStringExtra("appName"));
        mWebView = (WebView) findViewById(R.id.web_view);
        // 加載網(wǎng)址
        mWebView.loadUrl("http://www.baidu.com");
        // 允許使用JavaScript
        mWebView.getSettings().setJavaScriptEnabled(true);
        // 可重寫很多方法實(shí)現(xiàn)不同的功能
        mWebView.setWebViewClient(new WebViewClient(){
        });
    }
    @Override
    public void onBackPressed() {
        if (mWebView != null && mWebView.canGoBack()) {
            mWebView.goBack();
        } else {
            super.onBackPressed();
        }
    }
}

Widget

Widget是BroadcastReceive的實(shí)現(xiàn)粱玲，由于Widget和App是相分離的躬柬，所以Widget是運(yùn)行再主屏幕進(jìn)程上的，所以和傳統(tǒng)的Activity的一些設(shè)置有很大不同抽减，有很多限制允青。
Android Widget詳解
Google Developers App Widgets