Question

我的目标是

按下按钮btnAktivieren，
然后在一段时间后（随机定义）显示通知。
我点按此通知，这会将我引导至alertdialog。
在做出AlertDialog选择后，它会回到2。

到目前为止，即使代码应该贯穿整个

我尝试了什么

MainActivity.java

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

    boolean aktiviert = false;
    public EditText minutenVon = null;
    public EditText minutenBis = null;
    public Context con = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        con = this;

        final Button btnAktivieren = (Button)findViewById(R.id.btnAktivieren);

        btnAktivieren.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                minutenBis = (EditText)findViewById(R.id.etBis);
                minutenVon = (EditText)findViewById(R.id.etVon);
                EditText etAktuelleAufgabe = (EditText)findViewById(R.id.etAktuelleAufgabe);
                if (aktiviert) {
                    btnAktivieren.setText("Aktivieren");
                    aktiviert = false;
                }
                else
                {
                    btnAktivieren.setText("Deaktivieren");
                    Random random = new Random();
                    int w = (int) (random.nextDouble() * (Double.parseDouble(minutenBis.getText().toString()) - Double.parseDouble(minutenVon.getText().toString())) + Double.parseDouble(minutenVon.getText().toString()));
                    int interval = w * 60000;
                    int interval_in_sekunden = w * 60;
                    aktiviert = true;
                    String aufgabe = "";
                    if (etAktuelleAufgabe.getText().toString() == "")
                        aufgabe = "Diese Information";
                    else
                        aufgabe = etAktuelleAufgabe.getText().toString();

                    PendingIntent pendingIntent;
                    Intent intent;

                    intent = new Intent(con, Kommt.class);
                    intent.putExtra("aufgabe", aufgabe);
                    intent.putExtra("minutenVon", minutenVon.getText().toString());
                    intent.putExtra("minutenBis", minutenBis.getText().toString());
                    pendingIntent = PendingIntent.getBroadcast(con, 0, intent,
                            PendingIntent.FLAG_UPDATE_CURRENT);

                    Notification notificationBuilder = new Notification.Builder(con)
                            .setContentTitle(aufgabe)
                            .setContentText("Test")
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .setWhen((System.currentTimeMillis()/1000)+interval_in_sekunden)
                            .setContentIntent(pendingIntent)
                            .setAutoCancel(true)
                            .build();
                    NotificationManager notificationManager = (NotificationManager) getSystemService (Context.NOTIFICATION_SERVICE);

                    notificationManager.notify(0, notificationBuilder);
                }
            }
        });
    }
}

清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.test.test">
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
    <uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />
    <application
        android:allowBackup="true"
        android:launchMode="singleTop"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".Kommt" />
    </application>

</manifest>

Kommt.java

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

import java.util.Random;

public class Kommt extends BroadcastReceiver {
    public Context con;
    String aufgabe = "";
    String minutenVon = "";
    String minutenBis = "";
    private Context mContext;
    public void onReceive(Context context, Intent intent) {


        con = context;
        aufgabe = intent.getStringExtra("aufgabe");
        minutenVon = intent.getStringExtra("minutenVon");
        minutenBis = intent.getStringExtra("minutenBis");
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setIcon(R.mipmap.ic_launcher);
        builder.setTitle(aufgabe)
                .setMessage("Test");
        builder.setPositiveButton("Ja", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                neu();
            }
        });
        builder.setNegativeButton("Nein", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                AlertDialog.Builder builder = new AlertDialog.Builder(con);
                builder.setIcon(R.mipmap.ic_launcher);
                builder.setTitle("Test")
                        .setMessage("Test2");
                builder.setPositiveButton("Gut", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        neu();
                    }
                });
                builder.create().show();
            }
        });
        AlertDialog dialog = builder.create();
        dialog.show();
    }


    public void neu()
    {
        Random random = new Random();
        int w = (int) (random.nextDouble() * (Double.parseDouble(minutenBis.toString()) - Double.parseDouble(minutenVon.toString())) + Double.parseDouble(minutenVon.toString()));
        int interval = w * 60000;
        int interval_in_sekunden = w * 60;
        String aufgabe = "";
        if (aufgabe == "")
            aufgabe = "Test";

        PendingIntent pendingIntent;
        Intent intent;



        intent = new Intent(con, Kommt.class);
        intent.putExtra("aufgabe", aufgabe);
        pendingIntent = PendingIntent.getBroadcast(con, 0, intent,
                PendingIntent.FLAG_UPDATE_CURRENT);

        Notification notificationBuilder = new Notification.Builder(con)
                .setContentTitle(aufgabe)
                .setContentText("Testtest3")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setWhen((System.currentTimeMillis()/1000)+interval_in_sekunden)
                .setContentIntent(pendingIntent)
                .setAutoCancel(true)
                .build();
        NotificationManager notificationManager = (NotificationManager) con.getSystemService (Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0, notificationBuilder);
    }

}

Answer 1

您正在尝试从BroadcastReceiver打开无法找到上下文的AlertDialog（上下文）。有一件事将用户重定向到broadcastreceiver并从那里显示onCreate中的alertdialog。

问题一：你必须在警告对话框中传递主题

AlertDialog.Builder builder = new AlertDialog.Builder（背景下， R.style.AppTheme）;

其次您无法显示Broadcastreceiver的对话框，因为开发人员希望您知道如何将用户从Broadcastreceiver重定向到活动。错误你必须为此

崩溃

java.lang.RuntimeException：无法启动接收器 com.stackoverflow.Kommit： android.view.WindowManager $ BadTokenException：无法添加窗口 - token null不适用于应用程序

因此将用户重定向到MainActivity而不是显示alertDialog，并在MainActivity的onCreate中显示警告对话框，其中您将在MainActivity上有上下文

更新 Kommit.java（onReceive）

Intent i = new Intent(context, MainActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); Bundle b = new Bundle();
b.putInt("notify", 1);
i.putExtras(b); //Put your id to your next Intent 
context.startActivity(i);

在MainActivity中 OnCreate（）

Bundle b = getIntent().getExtras();  int value = 0; // or other values
if(b != null) 
value = b.getInt("notify"); 
if(value !=0)
{
 //show alertdialog 
}

P. Dee编辑：更正了您的通知。

Answer 2

尝试更改不同通知的ID：

notificationManager.notify(0, notificationBuilder);

此处将0更改为某个动态数字

Answer 3

通常，对话框需要“活动”上下文，或者使对话框键入系统警报对话框

alert.getWindow（）的setType（WindowManager.LayoutParams.TYPE_SYSTEM_ALERT）;

这需要在清单中声明android.permission.SYSTEM_ALERT_WINDOW。

Answer 4

就我而言，onReceive只能存活10秒。因此，如果您的随机时间超过10秒，则会破坏通知对象，该对象将在onReceive中新建。所以我的建议是在Service而不是Broadcast Receiver中的新主题中执行此操作。

没有从通知回来，Broadcastreceiver没有工作

4 个答案: