如何使用警报管理器触发Wallpaperservice.enigine类。(我不想使用RTC_Wakeup)

Question

我正在开发一个壁纸应用程序。如果文件夹不存在，则在外部存储中创建文件夹。用户设置的时间间隔。然后应用程序将在用户提供的时间间隔内从该文件夹中设置壁纸（如果不是空的）。

1. File dir= new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+"imagesWallpaper");

   if(!dir.isDirectory())
       dir.mkdirs();
   

它不是创建文件夹我的外部记忆不知道为什么

2.我触发了壁纸服务，但我不知道为什么它没有启动壁纸引擎类。请帮助。

壁纸主活动：

public class WallpaperMainActivity extends Activity {
    private RadioGroup radioGroup;
    public long interval = 0;
    File[] wallpaperImages = null;
    int count = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_wall_paper_manager);
    File dir= new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+"imagesWallpaper");
    if(!dir.isDirectory())
        dir.mkdirs();

        radioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
        radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
        {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId)
            {
            long time =Integer.valueOf((String) findViewById(checkedId).getTag());
            interval = time*60000;
            scheduleAlarm();    
            }
        });
    }
    public void scheduleAlarm() 
    {
        Intent intent = new Intent(WallpaperMainActivity.this, WallpaperSrvc.class);
        PendingIntent pintent = PendingIntent.getService(WallpaperMainActivity.this, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarm.setRepeating(AlarmManager.RTC, 10*1000, interval, pintent);
    }
}

壁纸Srvc和壁纸引擎类：

public class WallpaperSrvc extends WallpaperService {
        File[] wallpaperImages = null;
        int count = 0;
        Bitmap tmp = null;
        //Drawable drawable;
        @Override
        public Engine onCreateEngine() {
            return new WallpaperEngine();
        }
        public class WallpaperEngine extends Engine {
            private boolean mVisible = true;
            @Override
            public void onVisibilityChanged(boolean visible) {
                mVisible = visible;
                 if (visible)
                 {
                    getImage();
                    draw();
                 }
                 else
                 {
                    stopSelf();// stop the wallpaper
                 }
                super.onVisibilityChanged(visible);
            }
            @Override
            public void onOffsetsChanged(float xOffset, float yOffset,
                    float xOffsetStep, float yOffsetStep, int xPixelOffset,
                    int yPixelOffset) {
                draw();
                super.onOffsetsChanged(xOffset, yOffset, xOffsetStep, yOffsetStep,
                        xPixelOffset, yPixelOffset);
            }
            @Override
            public void onSurfaceChanged(SurfaceHolder holder, int format,
                    int width, int height) {
                super.onSurfaceChanged(holder, format, width, height);
            }
            @Override
            public void onSurfaceCreated(SurfaceHolder holder) {
                getImage();
                super.onSurfaceCreated(holder);
            }
            @Override
            public void onSurfaceDestroyed(SurfaceHolder holder) {
                super.onSurfaceDestroyed(holder);
                mVisible = false;
                stopSelf();
                 // stop the wallaperservice
            }

        }
        public  void getImage()
        {
            File dir= new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/"+"imagesWallpaper");
            if(!dir.exists())
                dir.mkdir();
            else
                wallpaperImages = dir. listFiles();
            if(count < wallpaperImages.length)
            {
                this.tmp = BitmapFactory.decodeFile(wallpaperImages[count].getAbsolutePath());
                count++;
            }
            else
            {
                count = 0;
                this.tmp = BitmapFactory.decodeFile(wallpaperImages[count].getAbsolutePath());
            }
        };
        public void draw() {
            WallpaperManager myWallpaperManager = WallpaperManager.getInstance(getApplicationContext());
            try
            {
                //Bitmap wallpaper = ((BitmapDrawable) drawable).getBitmap();
                myWallpaperManager.setBitmap(tmp);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        };
    }

清单：

    <uses-sdk
        android:minSdkVersion="17"
        android:targetSdkVersion="21" />
    <uses-permission android:name="com.android.alarm.permission.SET_ALARM"/> 
    <uses-permission android:name="android.permission.SET_WALLPAPER" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <service
            android:name=".WallpaperSrvc"
            android:enabled="true"
            android:label="wallpaper_service"
            android:icon="@drawable/ic_launcher"
            android:permission="android.permission.BIND_WALLPAPER" >
            <intent-filter>
                <action android:name="android.service.wallpaper.WallpaperService" >
                </action>
            </intent-filter>
            <meta-data
                android:name="android.service.wallpaper"
                android:resource="@xml/mywallpaper" >
            </meta-data>
        </service>
        <activity
            android:name=".WallpaperMainActivity"
            android:exported="true"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Light.WallpaperSettings" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>   
         <receiver android:name=".WallpaperSrvc"/>       
    </application>
</manifest>

主要活动布局：

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin">
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:orientation="vertical" >
        <TextView
            android:id="@+id/textView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="0dp"
            android:orientation="horizontal"
            android:text="@string/Discription"
            android:textAppearance="?android:attr/textAppearanceLarge" />
        <RadioGroup
            android:id="@+id/radioGroup1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checkedButton="@+id/one_day"
            android:clickable="true"
            android:orientation="vertical"
            android:scrollbars="vertical" >
        <RadioButton
            android:id="@+id/oneminute"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="1 minute" 
            android:tag="1"/>
        <RadioButton
            android:id="@+id/thirty_minutes"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="30 minutes"
            android:tag="30"/>
        <RadioButton
            android:id="@+id/one_hour"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="1 hour"
            android:tag="60"/>
        <RadioButton
            android:id="@+id/two_hours"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="2 hours"
            android:tag="120"/>
        <RadioButton
            android:id="@+id/six_hours"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="6 hours" 
            android:tag="360"/>
        <RadioButton
            android:id="@+id/tvlv_hours"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="12 hours"
            android:tag="720"/>
        <RadioButton
            android:id="@+id/one_day"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="1 day"
            android:tag="1440"/>
        <RadioButton
            android:id="@+id/three_days"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="3 days"
            android:tag="4320"/>
        <RadioButton
            android:id="@+id/oneweek"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="week"
            android:tag="10080"/>
    </RadioGroup>
    </LinearLayout>
</LinearLayout>

res/xml/mywallpaper.xml:

<?xml version="1.0" encoding="UTF-8"?>
<wallpaper 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:thumbnail="@drawable/ic_launcher"
  android:description="@string/wallpaper_description"  
  android:settingsActivity="com.wallpaper.WallpaperMainActivity"/> 

Answer 1

您必须使用写入外部存储权限。这就是为什么它不创建你的目录。

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

将其与您的警报和壁纸任务一起添加到您的清单中