在整个应用程序中管理循环SeekBar

时间:2016-05-30 10:52:17

标签: android android-mediaplayer

我正在开发一款用于在线播放歌曲的应用。我可以点击它播放这首歌。

我的问题是我在所有活动中都有一个CircularSeekBar,我需要在所有屏幕上管理它。如果从任何活动播放歌曲,则所有屏幕上都应显示CircularSeekBar。我能做的是当播放一首歌时,我能够在该特定活动上显示搜索栏,但无法在任何其他活动中管理该搜索栏。

以下是我的一个xml文件的示例:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical">
 </LinearLayout>

<include layout="@layout/seek_bar_layout"></include>
</android.support.design.widget.CoordinatorLayout>

请告诉我如何在所有活动中管理该搜索栏。

先谢谢。

1 个答案:

答案 0 :(得分:2)

当其他可见时,您无法管理活动视图。

您可以通过任何boolean标记解析它(例如:isSongPlaying = false)。当您开始播放歌曲时,请将其设置为true。在onResume中的每个活动中,检查该标记并显示/隐藏您的SeekBar

尽量避免使用public static并使用任何其他方式。

编辑:

根据您的评论,我创建了一个非常简单的示例,说明如何使用服务解决问题。请记住,此代码需要进行大量改进。

<强> SongService

public class SongService extends Service {

    ActivityManager activityManager;
    IBinder iBinder;
    boolean playingSong = false;
    Worker worker;

    public SongService() {
        iBinder = new MyBinder();
    }

    private void playSong(String path) {
        if(worker != null) {
            worker.cancel(true);
        }
        worker = new Worker();
        worker.execute();
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return iBinder;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return super.onStartCommand(intent, flags, startId);
    }

    private class Worker extends AsyncTask<Void, Integer, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            playingSong = true;
        }

        @Override
        protected Void doInBackground(Void... params) {
            for (int i = 100; i > -1; i--) {
                publishProgress(i);
                try {
                    Thread.sleep(100l);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            if (activityManager != null) {
                activityManager.publishProgress(values[0]);
            }
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            playingSong = false;
            activityManager.onSongFinish();
        }
    }

    public class MyBinder extends Binder {

        public SongService getSongService() {
            return SongService.this;
        }

        public void BindView(ActivityManager activityManager) {
            SongService.this.activityManager = activityManager;
        }

        public void playSong(String path) {
            SongService.this.playSong(path);
        }

        public boolean isPlayingSong() {
            return playingSong;
        }
    }

    public interface ActivityManager {
        void publishProgress(int progress);

        void onSongFinish();
    }
}

<强> MainActivity:

public class MainActivity
        extends AppCompatActivity
        implements ServiceConnection, SongService.ActivityManager {

    TextView progress;
    Button play;
    Button next;
    SongService.MyBinder myBinder;

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

        progress = (TextView) findViewById(R.id.progress);
        play = (Button) findViewById(R.id.play);
        play.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(myBinder != null) {
                    //Your path to song
                    myBinder.playSong("");
                    play.setEnabled(false);
                }
            }
        });


        next = (Button) findViewById(R.id.next);
        next.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, MainActivity2.class);
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();

        Intent mIntent = new Intent(this, SongService.class);
        bindService(mIntent, this, BIND_AUTO_CREATE);
    }

    @Override
    protected void onStop() {
        super.onStop();

        unbindService(this);
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        if(service instanceof SongService.MyBinder) {
            myBinder = (SongService.MyBinder) service;
            myBinder.BindView(this);

            if (myBinder.isPlayingSong()) {
                play.setEnabled(false);
            }
            else {
                play.setEnabled(true);
            }
        }
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        myBinder = null;
    }

    @Override
    public void publishProgress(int progress) {
        this.progress.setText("Progress: " + progress);
    }

    @Override
    public void onSongFinish() {
        play.setEnabled(true);
    }
}

<强> MainActivity2

此活动类与MainActivity看起来非常相似,但具有不同的布局文件。

MainActivity - 布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context="com.example.aszymanski2.serviceanddelegatepatternexample.MainActivity">

    <TextView
        android:id="@+id/progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:text="Play"
        android:id="@+id/play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"/>

    <Button
        android:text="SecondActivity"
        android:id="@+id/next"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"/>
</RelativeLayout>

MainActivity2 - 布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    tools:context="com.example.aszymanski2.serviceanddelegatepatternexample.MainActivity">

    <TextView
        android:id="@+id/progress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <Button
        android:text="Play"
        android:id="@+id/play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"/>

    <Button
        android:text="Back"
        android:id="@+id/next"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"/>
</RelativeLayout>