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android 之 Intent、broadcast

發布時間：2023/11/27 生活经验 25 豆豆

生活随笔收集整理的這篇文章主要介紹了 android 之 Intent、broadcast 小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

Intent的功能有：

在mainActivity中為按鈕1添加監聽事件：

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", "這是來自mainActivity的數據");
??????? startActivityForResult(intent1,?REQUEST_CODE);
??? }
};

在Activity1中接收來自mainActivity中Intent中的數據：

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

為Activity1中的按鈕添加監聽事件，返回一個Intent：

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

在mainActivity中覆寫onActivityResult（）方法，對返回的內容處理：

@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);
??????????? }
??????? }
??? }

為按鈕2添加監聽事件：

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);
??????????? }
??????? };

添加一個Broadcast Receiver，其捕獲action為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中注冊：

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