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zh-cnMon, 10 Sep 2012 18:47:13 GMTMon, 10 Sep 2012 18:47:13 GMT60读取 android 设备的电池信息http://www.blogjava.net/gaolei-xj/archive/2012/09/10/387427.htmlanthonyanthonyMon, 10 Sep 2012 15:45:00 GMThttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387427.htmlhttp://www.blogjava.net/gaolei-xj/comments/387427.htmlhttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387427.html#Feedback0http://www.blogjava.net/gaolei-xj/comments/commentRss/387427.htmlhttp://www.blogjava.net/gaolei-xj/services/trackbacks/387427.html 通过创建BroadcastReceiver来侦测系统中有关电池Intent(ACTION_BATTERY_CHANGED)的变化，一旦有接收到相关事件，将会读取当前电量情况，并通过TextViews显示在当前屏幕。

1 public class MyButteryDemo extends Activity {
2     private Button button = null;
3
4     @Override
5     public void onCreate(Bundle savedInstanceState) {
6         super.onCreate(savedInstanceState);
7         setContentView(R.layout.main);
8
9         button = (Button) findViewById(R.id.btn);
10         button.setOnClickListener(new OnClickListenerImpl());
11     }
12
13     private class OnClickListenerImpl implements OnClickListener {
14
15         @Override
16         public void onClick(View arg0) {
17             ButteryBroadcastReceiver receiver = new ButteryBroadcastReceiver();
18             IntentFilter filter = new IntentFilter(
19                     Intent.ACTION_BATTERY_CHANGED);
20             MyButteryDemo.this.registerReceiver(receiver, filter);
21         }
22
23     }
24 }

1 public class ButteryBroadcastReceiver extends BroadcastReceiver {
2
3     @Override
4     public void onReceive(Context context, Intent intent) {
5
6         if (Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())) {
7             int level = intent.getIntExtra("level", 0);
8             int scale = intent.getIntExtra("scale", 100);
9             Dialog dialog = new AlertDialog.Builder(context)
10                     .setTitle("电池电量")
11                     .setMessage(
12                             "电池电量为：" + String.valueOf(level * 100 / scale)
13                                     + "%").setNegativeButton("关闭", new DialogInterface.OnClickListener() {
14
15                                         @Override
16                                         public void onClick(DialogInterface dialog, int which) {
17                                             // TODO Auto-generated method stub
18
19                                         }
20                                     }).create();
21             dialog.show();
22         }
23     }
24
25 }

anthony 2012-09-10 23:45 发表评论

]]>启动Receiverhttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387418.htmlanthonyanthonyMon, 10 Sep 2012 11:52:00 GMThttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387418.htmlhttp://www.blogjava.net/gaolei-xj/comments/387418.htmlhttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387418.html#Feedback0http://www.blogjava.net/gaolei-xj/comments/commentRss/387418.htmlhttp://www.blogjava.net/gaolei-xj/services/trackbacks/387418.html

开机启动Receiver

1 public void onReceive(Context context, Intent intent) {
2         String action = intent.getAction();
3         if(Intent.ACTION_BOOT_COMPLETED.equals(action)) {
4             Intent serviceIntent = new Intent();
5             serviceIntent.setClass(context, BcsService.class);
6             context.startService(serviceIntent);
7         }
8 }

开机和网络连接时启动Receiver

1 @Override
2     public void onReceive(Context context, Intent intent) {
3         String action = intent.getAction();
4         if(Intent.ACTION_BOOT_COMPLETED.equals(action) ||
5                 ConnectivityManager.CONNECTIVITY_ACTION.equals(action)) {
6             Intent serviceIntent = new Intent();
7             serviceIntent.setClass(context, BcsService.class);
8             context.startService(serviceIntent);
9         }
10     }

anthony 2012-09-10 19:52 发表评论

]]>判断sdcard是否能用http://www.blogjava.net/gaolei-xj/archive/2012/09/10/387417.htmlanthonyanthonyMon, 10 Sep 2012 11:42:00 GMThttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387417.htmlhttp://www.blogjava.net/gaolei-xj/comments/387417.htmlhttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387417.html#Feedback0http://www.blogjava.net/gaolei-xj/comments/commentRss/387417.htmlhttp://www.blogjava.net/gaolei-xj/services/trackbacks/387417.html1 if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
2 // sd card 可用
3 }else {
4 // 当前不可用
5 }

anthony 2012-09-10 19:42 发表评论

]]>取得sdcard目录http://www.blogjava.net/gaolei-xj/archive/2012/09/10/387416.htmlanthonyanthonyMon, 10 Sep 2012 11:40:00 GMThttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387416.htmlhttp://www.blogjava.net/gaolei-xj/comments/387416.htmlhttp://www.blogjava.net/gaolei-xj/archive/2012/09/10/387416.html#Feedback0http://www.blogjava.net/gaolei-xj/comments/commentRss/387416.htmlhttp://www.blogjava.net/gaolei-xj/services/trackbacks/387416.html1 public static String getSdDirectory() {
2 return Environment.getExternalStorageDirectory().getPath();
3 }

anthony 2012-09-10 19:40 发表评论

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