晚上好,
几天来我一直在努力实现一些目标,我真的不知道还能尝试什么,我基本上已经尝试了我在网上找到的所有东西,但它仍然不起作用,但我有一种感觉,一旦我找到了解决方案它必须非常简单。
我正在做一个更大的项目,但在这里我只是想得到一个非常简单的例子来工作,我以后可以适应我的项目。
我想做的事
我想让一个计数器在 1200 秒(20 分钟)内每秒添加 +1,并在每次计数时写入文件。我最终应该得到一个包含 1200 行的文件,每个样本都有一个时间戳。
我是如何做到的
我已经尝试了一百万件事,但在这里,我只是回到了一个非常基本的例子,所以我可以展示它并寻求帮助:
- 我有一个带有单个开始按钮的主要活动。
- 单击按钮时,我从活动开始一个新进程。这是一个 FOREGROUND 过程。
- 我开始循环计数。当我达到 1200 时,计数停止。
我的问题
虽然手机屏幕处于打开状态,但一切正常,但一旦我锁定屏幕并将手机放入口袋,取决于我正在测试的手机,它开始出现故障。
我想要什么
如果有人能告诉我要修改/添加/更改什么,甚至为我做,然后在这里写回(这是一个非常简单的项目),我将非常感激,我浪费了大量时间,我只是无法按右键。
代码
由于这是一个非常简单的项目,我将在这里复制它包含的 4 个部分:
XML activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/start_button"
android:layout_width="150dp"
android:layout_height="50dp"
android:layout_marginStart="52dp"
android:layout_marginBottom="116dp"
android:onClick="startProcess"
android:text="@string/button_label_start"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/counter_textView"
android:layout_width="383dp"
android:layout_height="412dp"
android:gravity="center_horizontal|center_vertical"
android:text="@string/counter_label_value"
android:textSize="160sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.428"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.169" />
</androidx.constraintlayout.widget.ConstraintLayout>
清单AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.helloworld">
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<service
android:name=".ForegroundService"
android:enabled="true"
android:exported="true"
android:process=":externalProcess">
</service>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
主要MainActivity.java
package com.example.helloworld;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
public static final String CHANNEL_ID = "ForegroundServiceChannel";
private TextView mShowCount;
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
int mCount = data.getIntExtra(ForegroundService.FOREGROUND_MESSAGE, -1);
if(mShowCount != null)
mShowCount.setText(Integer.toString(mCount));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mShowCount = findViewById(R.id.counter_textView);
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onStop() {
super.onStop();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
protected void onRestart() {
super.onRestart();
}
public void startProcess(View view) {
PendingIntent pendingResult = createPendingResult(100, new Intent(), 0);
Intent serviceIntent = new Intent(this, ForegroundService.class);
serviceIntent.putExtra("pendingIntent", pendingResult);
ContextCompat.startForegroundService(this, serviceIntent);
}
public void stopProcess(View view) {
Intent serviceIntent = new Intent(this, ForegroundService.class);
stopService(serviceIntent);
}
}
前台服务ForegroundService.java
package com.example.helloworld;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.Build;
import android.os.IBinder;
import android.os.SystemClock;
import android.util.Log;
import androidx.core.app.NotificationCompat;
import java.io.File;
import java.io.FileWriter;
import java.util.Date;
public class ForegroundService extends Service {
public static final String CHANNEL_ID = "ForegroundServiceChannel";
public static final String FOREGROUND_MESSAGE = "com.example.helloworld.FOREGROUND_MESSAGE";
private PendingIntent data;
private int mCount;
private File basePath;
public ForegroundService() {
}
@Override
protected void finalize() throws Throwable {
super.finalize();
}
@Override
public void onCreate() {
super.onCreate();
}
@Override
public boolean stopService(Intent name) {
return super.stopService(name);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String input = intent.getStringExtra("inputExtra");
createNotificationChannel();
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,
0, notificationIntent, 0);
Notification notification = new NotificationCompat.Builder(this, MainActivity.CHANNEL_ID)
.setContentTitle("Foreground Service")
.setContentText(input)
.setContentIntent(pendingIntent)
.build();
startForeground(1, notification);
data = intent.getParcelableExtra("pendingIntent");
this.basePath = this.getExternalFilesDir("recs");
mCount = 0;
new Thread(new Runnable() {
public void run() {
try {
while(mCount < 1200) {
Intent resultIntent = new Intent();
resultIntent.putExtra(FOREGROUND_MESSAGE, ++mCount);
writeFile((new Date().getTime() / 1000) + " Increasing counter: " + mCount + "\n");
data.send(ForegroundService.this, 200, resultIntent);
SystemClock.sleep(1000);
}
}catch (Exception ignored){}
}
}).start();
//stopSelf();
return START_NOT_STICKY;
}
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel serviceChannel = new NotificationChannel(
CHANNEL_ID,
"Foreground Service Channel",
NotificationManager.IMPORTANCE_DEFAULT
);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(serviceChannel);
}
}
@Override
public void onDestroy(){
super.onDestroy();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private void writeFile(String data)
{
File file = new File (basePath,"test");
if (!file.exists()) {
boolean mkdirs = file.mkdirs();
if (!mkdirs) {
Log.e("RECORDING", "Error creating SAVE BASE PATH");
}
}
try{
File counter_file = new File(file, "counter.txt");
FileWriter writer = new FileWriter(counter_file, true);
writer.append(data);
writer.flush();
writer.close();
} catch (Exception e){
e.printStackTrace();
}
}
}
我知道我的要求可能有点过分,但此时我非常绝望。如果有人能提出一个可行的解决方案,我会非常感激。
非常感谢。