android - 从 BroadcastReceiver 启动 Activity

Question

我有以下代码从扩展 BroadcastReceiver 的类发送电子邮件:

Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
S2Mconfig s2m = new S2Mconfig();
Log.d(TAG, "Create Intent for mail to " + address);
emailIntent.setType("plain/text");
emailIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL, s2m.read(thisContext));
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, address);
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, body);
Log.d(TAG, String.format("Sending mail %s", emailIntent.toString()));
thisContext.startActivity(Intent.createChooser(emailIntent, "Send mail..."));

BroadcastReciever在manifest中注册，我设置了INTERNET权限:

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

<receiver android:name=".SmsReceiver" android:exported="true" > 
        <intent-filter android:priority="1000"> 
            <action android:name="android.provider.Telephony.SMS_RECEIVED" />
            <action android:name="android.provider.Telephony.MMS_RECEIVED" />
        </intent-filter>
    </receiver>

日志确认 FLAG_ACTIVITY_NEW_TASK 是在调用 startActivity() 之前设置的。尽管如此，我仍然遇到可怕的 “调用 startActivity()...需要 FLAG_ACTIVITY_NEW_TASK 标志...任何线索将不胜感激。

Answer 1

@Override
public void onReceive(Context context, Intent intent){
    Context appContext = context.getApplicationContext();

并且使用 appContext，您可以启动“正常” Activity 。说明here是一个例子

public void sendNotificationEmail(String emailBody) {
        Intent emailIntent = new Intent(Intent.ACTION_SEND);
        emailIntent.setType("text/html");
        emailIntent.putExtra(Intent.EXTRA_EMAIL, notificationRecipients);
        emailIntent.putExtra(Intent.EXTRA_SUBJECT, "MyAppName Error");
        emailIntent.putExtra(Intent.EXTRA_TEXT, emailBody);
        Intent emailChooser = Intent.createChooser(emailIntent, "An error has occurred! Send an error report?");
        emailChooser.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        try {
            startActivity(emailChooser);
        } catch (ActivityNotFoundException e) {
            // If there is nothing that can send a text/html MIME type
            e.printStackTrace();
        }
    }

因此将 FLAG_ACTIVITY_NEW_TASK 添加到选择器 Intent 而不是发送者!