android中获得系统语言

String str = Locale.getDefault().getLanguage();
                Log.i("my", str);   

中文为   str ="cn";

英文为  str ="en";

日文为  str ="ja";

。。。。

写个程序监控设置中语言变化

public class AndroidLanguageActivity extends Activity {
    
    class MyReceiver extends BroadcastReceiver 
    {

        @Override
        public void onReceive(Context context, Intent intent)
        {
            // TODO Auto-generated method stub
            if("Intent.ACTION_LOCALE_CHANGED".equals(intent.getAction()))
            {
                String str = Locale.getDefault().getLanguage();
                Log.i("my", "changed    "+str);
            }
        }
        
    }
    MyReceiver receiver;
    IntentFilter filter;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        View view  = new TestDrawView(this);
//        view.setBackgroundDrawable(getResources().getDrawable(R.drawable.xx));
        setContentView(view);
        receiver = new MyReceiver();
        filter = new IntentFilter("Intent.ACTION_LOCALE_CHANGED");
       
    }
    
    @Override
    protected void onResume()
    {
        // TODO Auto-generated method stub
        super.onResume();
        registerReceiver(receiver, filter);
        String str = Locale.getDefault().getLanguage();
        Log.i("my", str);
    }

    @Override
    protected void onPause()
    {
        // TODO Auto-generated method stub
        super.onPause();
        unregisterReceiver(receiver);
    }
    
}

根据官方文档指明，注册广播在onSume()中,解除注册unregister(receiver);在onPause()中。

而且如果假设广播只在本应用中的话推荐使用LocalBroadcastManager,因为它具有一下优点：

1    因广播数据在本应用范围内传播，你不用担心隐私数据泄露的问题。

2    不用担心别的应用伪造广播，造成安全隐患。

3    相比在系统内发送全局广播，它更高效。