尝试从广播接收器开始活动 [英] Trying to start an activity from broadcast receiver
本文介绍了尝试从广播接收器开始活动的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试创建一个锁屏.当我尝试从broadcastReceiver启动 com.fira.locker.LockScreenActivity
时,出现一个错误.错误提示:
I'm trying to create a lockscreen. When I try to start the com.fira.locker.LockScreenActivity
from the broadcastReceiver, I just get an error. The error says:
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Intent android.content.Intent.setFlags(int)' on a null object reference
这是我的代码:
package com.fira.locker;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Environment;
import android.util.Log;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
/**
* Created by Johannett321 on 10/04/16.
*/
public class LockScreenReceiver extends BroadcastReceiver {
public String screenlockedNumber;
@Override
public void onReceive(Context context, Intent intent) {
//start activity
Intent i = new Intent();
i.setClassName("com.fira.locker", "com.fira.locker.LockScreenActivity");
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}
}
推荐答案
为什么不像这样开始简单的意图.
Why are you not starting simple intent like this..
startActivity(new Intent(this, LockScreenActivity.class));
finish();
或者您可以尝试一下.
Intent i = new Intent(context,LockScreenActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
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