安卓学习03

2020-02-03

今日学习了mediaplayer的简单封装使用以及引导页。

1、mediaplayer的封装

package com.example.framework.manager;

import android.content.res.AssetFileDescriptor;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Handler;
import android.os.Message;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;

import com.example.framework.utils.LogUtils;

import java.io.IOException;

public class MediaPlayerManager {

    //播放
    public static final int MEDIA_STATUS_PLAY = 0;
    //暂停
    public static final int MEDIA_STATUS_PAUSE = 1;
    //停止
    public static final int MEDIA_STATUS_STOP = 2;
    //当前状态
    public static int MEDIA_STATUS = MEDIA_STATUS_STOP;

    public static final int H_PROGRESS = 1000;

    private MediaPlayer mediaPlayer;
    private OnMusicProgressListener musicProgressListener;
    private Handler handler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage( Message msg) {
            switch (msg.what){
                case H_PROGRESS:
                    if (musicProgressListener != null){
                        int currentPosition = getCurrentPosition();
                        int p = (int) (((float)currentPosition)/((float)getDuration()) * 100);
                        musicProgressListener.OnProgress(currentPosition,p);
                        handler.sendEmptyMessageDelayed(H_PROGRESS,1000);
                    }
                    break;
            }
            return false;
        }
    });

    public MediaPlayerManager() {
        mediaPlayer = new MediaPlayer();
    }

    @RequiresApi(api = Build.VERSION_CODES.N)
    public void startPlay(AssetFileDescriptor path){
        try {
            mediaPlayer.reset();
            mediaPlayer.setDataSource(path);
            mediaPlayer.prepare();
            mediaPlayer.start();
            MEDIA_STATUS = MEDIA_STATUS_PLAY;
            handler.sendEmptyMessage(H_PROGRESS);
        } catch (IOException e) {
            LogUtils.e(e.toString());
            e.printStackTrace();
        }
    }

    //暂停播放
    public void pausePlay(){
        if (mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            MEDIA_STATUS = MEDIA_STATUS_PAUSE;
            handler.removeMessages(H_PROGRESS);
        }
    }

    //继续播放
    public void continuePlay(){
        mediaPlayer.start();
        MEDIA_STATUS = MEDIA_STATUS_PLAY;
        handler.sendEmptyMessage(H_PROGRESS);
    }

    //停止播放
    public void stopPlay(){
        mediaPlayer.stop();
        MEDIA_STATUS = MEDIA_STATUS_STOP;
        handler.removeMessages(H_PROGRESS);
    }

    //获取当前位置
    public int getCurrentPosition(){
        return mediaPlayer.getCurrentPosition();
    }

    //获取音乐的总时间
    public int getDuration(){
        return mediaPlayer.getDuration();
    }

    //是否循环
    public void setLooping(boolean isLooping){
        mediaPlayer.setLooping(isLooping);
    }

    //跳转位置
    public void seekTo(int mesc){
        mediaPlayer.seekTo(mesc);
    }

    //播放结束
    public void setOnCompletionListener(MediaPlayer.OnCompletionListener listener){
        mediaPlayer.setOnCompletionListener(listener);
    }

    //播放错误
    public void setOnErrorListener(MediaPlayer.OnErrorListener listener){
        mediaPlayer.setOnErrorListener(listener);
    }

    //播放进度
    public void setOnProgressListener(OnMusicProgressListener listener){
        musicProgressListener = listener;
    }

    public interface OnMusicProgressListener{
        void OnProgress(int progress,int pos);
    }
}

在页面的使用代码为：

public class MainActivity extends BaseUIActivity {

    @RequiresApi(api = Build.VERSION_CODES.N)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final MediaPlayerManager mediaPlayerManager = new MediaPlayerManager();
        AssetFileDescriptor fileDescriptor = getResources().openRawResourceFd(R.raw.guide);
        mediaPlayerManager.startPlay(fileDescriptor);
        mediaPlayerManager.setOnProgressListener(new MediaPlayerManager.OnMusicProgressListener() {
            @Override
            public void OnProgress(int progress,int pos) {

            }
        });
    }
}

这样就可以简单的找到项目中的一个音乐并播放了。

2、刘海屏和水滴屏的适配

在AndroidManifest.xml中添加以下适配的代码：

<!--        刘海屏适配-->
        <meta-data android:name="android.max_aspect"
            android:value="2.2" />

<!--        小米水滴屏适配-->
        <meta-data
            android:name="notch.config"
            android:value="portrait|landscape"/>

3、引导页

package com.example.meet.UI;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import com.example.framework.entity.Constants;
import com.example.framework.utils.SpUtils;
import com.example.meet.MainActivity;
import com.example.meet.R;

public class IndexActivity extends AppCompatActivity {

    /*
    1、把启动页全屏
    2、延迟进入主页
    3、根据具体逻辑是进入主页还是引导页还是登录页
    4、适配刘海屏
     */
    private static final int SKIN_MAIN = 1000;
    private Handler handler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage( Message msg) {
            switch (msg.what){
                case SKIN_MAIN:
                    startMain();
                    break;
            }
            return false;
        }
    });

    @Override
    protected void onCreate( Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_index);
        handler.sendEmptyMessageDelayed(SKIN_MAIN,2000);
    }

    /**
     * 进入主页
     */
    private void startMain(){
        //判断APP是否是第一次打开
        SpUtils.getInstance().initSp(this);
        boolean isFirstApp = SpUtils.getInstance().getBoolean(Constants.SP_IS_FIRST_APP, true);
        Intent intent = new Intent();
        if (isFirstApp){
            //跳转到引导页
            intent.setClass(this,GuideActivity.class);
            //设置为非第一次启动
            SpUtils.getInstance().putBoolean(Constants.SP_IS_FIRST_APP, false);
        }else {
            //判断是否登陆过
            String token = SpUtils.getInstance().getString(Constants.SP_TOKEN, "");
            if (TextUtils.isEmpty(token)){
                //跳转到登录页
                intent.setClass(this,LoginActivity.class);
            }else {
                //跳转到主页面
                intent.setClass(this, MainActivity.class);
            }
        }

        startActivity(intent);
        finish();
    }
}