首页 > 编程学习 > Android:实用代码(开启启动、建立GPRS连接、闹钟等)
20115 月18

Android:实用代码(开启启动、建立GPRS连接、闹钟等)

1:查看是否有存储卡插入

String status=Environment.getExternalStorageState(); if(status.equals(Enviroment.MEDIA_MOUNTED)) { 说明有SD卡插入 }

2:让某个Activity透明

OnCreate中不设Layout this.setTheme(R.style.Theme_Transparent);

以下是Theme_Transparent的定义(注意transparent_bg是一副透明的图片)

3:在屏幕元素中设置句柄

使用Activity.findViewById来取得屏幕上的元素的句柄. 使用该句柄您可以设置或获取任何该对象外露的值. TextView msgTextView = (TextView)findViewById(R.id.msg); msgTextView.setText(R.string.push_me);

4:发送短信

        String body=”this is mms demo”;

       Intent mmsintent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”smsto”, number, null));
       mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);
       mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, true);
       mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, true);
        startActivity(mmsintent);

5:发送彩信

       StringBuilder sb = new StringBuilder();

        sb.append(”file://”);

        sb.append(fd.getAbsoluteFile());

        Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”mmsto”, number, null));
        // Below extra datas are all optional.
        intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT, subject);
        intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);
        intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI, sb.toString());
        intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, composeMode);
        intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, exitOnSent);

        startActivity(intent);

6:发送Mail

         mime = “img/jpg”;
        shareIntent.setDataAndType(Uri.fromFile(fd), mime);
        shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(fd));
        shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);

        shareIntent.putExtra(Intent.EXTRA_TEXT, body);

7:注册一个BroadcastReceiver

registerReceiver(mMasterResetReciever, new IntentFilter(”OMS.action.MASTERRESET”));

private BroadcastReceiver mMasterResetReciever = new BroadcastReceiver() {

    public void onReceive(Context context, Intent intent){
        String action = intent.getAction();
        if(”oms.action.MASTERRESET”.equals(action)){
            RecoverDefaultConfig();
        }
    }

};

8:定义ContentObserver,监听某个数据表

private ContentObserver mDownloadsObserver = new DownloadsChangeObserver(Downloads.CONTENT_URI);

private class DownloadsChangeObserver extends ContentObserver { public DownloadsChangeObserver(Uri uri) { super(new Handler());

    }

    @Override
    public void onChange(boolean selfChange) {}  
    }

9:获得 手机UA

public String getUserAgent() { String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null); return user_agent; }

10:清空手机上Cookie

CookieSyncManager.createInstance(getApplicationContext()); CookieManager.getInstance().removeAllCookie();

11:建立GPRS连接

//Dial the GPRS link. private boolean openDataConnection() { // Set up data connection. DataConnection conn = DataConnection.getInstance();

        if (connectMode == 0) {
            ret = conn.openConnection(mContext, “cmwap”, “cmwap”, “cmwap”);
        } else {
            ret = conn.openConnection(mContext, “cmnet”, “”, “”);
        }

}

12:PreferenceActivity 用法

public class Setting extends PreferenceActivity

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.settings);
}

Setting.xml:

        Android:key=”seting2″
        android:title=”@string/seting2″
        android:summary=”@string/seting2″/>

        android:key=”seting1″
        android:title=”@string/seting1″
        android:summaryOff=”@string/seting1summaryOff”
        android:summaryOn=”@stringseting1summaryOff”/>

13:通过HttpClient从指定server获取数据

         DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet method = new HttpGet(“http://www.baidu.com/1.html”);
        HttpResponse resp;
        Reader reader = null;
        try {
            // AllClientPNames.TIMEOUT
            HttpParams params = new BasicHttpParams();
            params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, 10000);
            httpClient.setParams(params);
            resp = httpClient.execute(method);
            int status = resp.getStatusLine().getStatusCode();

            if (status != HttpStatus.SC_OK) return false;

            // HttpStatus.SC_OK;
            return true;
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            if (reader != null) try {
                reader.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

14:显示toast

Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();

15:屏幕显示

程序中默的显示是带有标题栏和系统信息栏的,有的时候,这很影响程序界面的美观。手机默认的是竖屏,或与感应器状态相关,为了某种效果,我们的程序需要限制使用横屏或竖屏。以下的代码就解决了上述问题。

//设置为无标题栏 requestWindowFeature(Window.FEATURE_NO_TITLE); //设置为全屏模式 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //设置为横屏 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

16:Intent传参

当Activity与Activity/Service(或其它情况)有时与要进行参数传递,最常用也是最简单的方式就是通过Intent来处理。 看如下代码: Intent intent = new Intent(…); Bundle bundle = new Bundle(); bundle.putString(“NAME”, “zixuan”); intent.putExtras(bundle); context.startActivity(intent); 或 context.startService(intent);

当然,有传送就有接收,接收也很简单,如: Bundle bunde = intent.getExtras(); String name = bunde.getInt(“NAME”); 当然参数KEY要与传送时的参数一致。

17:获取手机号

在j2me中,根本没有办法获取用户的手机号码,就连获取手机串号(IMEI)都基本上无法实现,然后在android手机上一切都是如此的简单,看代码: TelephonyManager tm = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE); String imei = tm.getDeviceId(); String tel = tm.getLine1Number(); 看来,android的确加速了j2me的消亡。

18:振动器

总感觉手机上的振动器没有多大用处(当然静音模式下的振铃很有用),但还是顺带着说一下吧,只有两行代码: 1、获取振动服务的实例 Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE); 2、设置振动时长,单位当然也是ms vibrator.vibrate(1000); 如果你觉得这样过去单调的话,可以设个节奏: vibrator.vibrate(new long[]{10, 100, 20, 200}, -1); 两个参数,习惯告诉我第一个是节奏,第二个是重复次数,可事实并没有这么简单,我翻译不好,大家还是看原文吧: public void vibrate (long[] pattern, int repeat) pattern: an array of longs of times to turn the vibrator on or off. repeat: the index into pattern at which to repeat, or -1 if you don’t want to repeat. google喜欢弄些技巧,我却觉得这里有点弄巧成拙了。

19:闹钟管理

最近看了一下Android的闹钟管理类(AlarmManager),真不错误,强大又简单,代码如下:

1)、建立一个AlarmReceiver继承入BroadcastReceiver,并在AndroidManifest.xml声明 public static class AlarmReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context, “闹钟提示:时间到!”, Toast.LENGTH_LONG).show(); } }

2)、建立Intent和PendingIntent,来调用目标组件。 Intent intent = new Intent(this, AlarmReceiver.class); PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

3)、设置闹钟 获取闹钟管理的实例: AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); 设置单次闹钟: alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (51000), pendingIntent); 设置周期闹钟: alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (101000), (246060*1000), pendingIntent);

20:开机自启动

1).定义一个BroadcastReceiver

public class BootReceiver extends BroadcastReceiver {
public void onReceive(Context ctx, Intent intent) {
    Log.d("BootReceiver", "system boot completed");
    //start activity
    String action="android.intent.action.MAIN";
    String category="android.intent.category.LAUNCHER";
    Intent myi=new Intent(ctx,CustomDialog.class);
    myi.setAction(action);
    myi.addCategory(category);
    myi.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    ctx.startActivity(myi);
    //start service
    Intent s=new Intent(ctx,MyService.class);
    ctx.startService(s);
    }
}

2).配置Receiver的许可,允许接收系统启动消息,在AndroidManifest.xml中:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>  

3).配置Receiver,可以接收系统启动消息,在AndroidManifest.xml中

        <receiver android:name=".app.BootReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED"/>
                      <category android:name="android.intent.category.HOME" />
            </intent-filter>
         </receiver>

4).启动模拟器,可以看到系统启动后,弹出一个对话框。

本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/lxh2808/archive/2010/10/30/5976351.aspx

本文地址:https://wizzer.cn/archives/1772 , 转载请保留.

本文目前尚无任何评论.

发表评论