android 之 Intent、broadcast

Intent的功能有：

在mainActivity中为按钮1添加监听事件：

listener1 = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
       Intent intent1 = new Intent(mainActivity.this, Activity1.class);
        intent1.putExtra("mainActivity", "这是来自mainActivity的数据");
        startActivityForResult(intent1, REQUEST_CODE);
    }
};

在Activity1中接收来自mainActivity中Intent中的数据：

String data = null;
Bundle extras = getIntent().getExtras();
if (extras != null) {
data = extras.getString("mainActivity");
}
setTitle("现在在Activity1里：" + data);

为Activity1中的按钮添加监听事件，返回一个Intent：

listener1 = new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Bundle bundle = new Bundle();
                bundle.putString("store", "数据来自Activity1");
                Intent mIntent = new Intent();
                mIntent.putExtras(bundle);
                setResult(RESULT_OK, mIntent);
                finish();
            }
        };

在mainActivity中覆写onActivityResult（）方法，对返回的内容处理：

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE) {
            if (resultCode == RESULT_CANCELED) {
                setTitle("取消");
            } else if (resultCode == RESULT_OK) {
                String temp = null;
                Bundle extras = data.getExtras();
                if (extras != null) {
                    temp = extras.getString("store");
                }
                setTitle("在mainActivity中："+temp);
            }
        }
    }

为按钮2添加监听事件：

protected static final String ACTION1 = "com.sunny.action.BROADCASE";

listener2 = new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent2 = new Intent(ACTION1);
                sendBroadcast(intent2);
            }
        };

添加一个Broadcast Receiver，其捕获action为com.sunny.action.BROADCASE的Intent，生成Notification：

public class broadcastReceive1 extends BroadcastReceiver {
    private static final int NOTIFICATION_ID = 0;
    Context context;

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        this.context=context;
       showNotification();
    }

    private void showNotification() {
        // TODO Auto-generated method stub
        NotificationManager notificationManager=(NotificationManager) context.getSystemService(android.content.Context.NOTIFICATION_SERVICE);
        Notification notification=new Notification(R.drawable.icon, "在broadcastReceive1中",System.currentTimeMillis());
        PendingIntent contentIntent=PendingIntent.getActivity(context, 0, new Intent(context,mainActivity.class), 0);
        notification.setLatestEventInfo(context, "在broadcastReceive1中：", null, contentIntent);
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

}

其在AndroidManifest.xml中注册：

<receiver android:name=".broadcastReceive1">
    <intent-filter>
        <action android:name="com.sunny.action.BROADCASE" />
    </intent-filter>
</receiver>