[Android Studio] Chapter 13 연습문제

[연습문제]

6

activitiy_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="6"
        android:orientation="horizontal">
        <ListView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/listViewMP3">
        </ListView>
    </LinearLayout>
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:id="@+id/btnPlay"
            android:text="듣기"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:id="@+id/btnPause"
            android:text="일시정지"/>
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:id="@+id/btnStop"
            android:text="중지"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="2"
        android:orientation="vertical">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tvMP3"
            android:text="실행중인 음악:"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tvTime"
            android:text="진행시간 : "/>
        <SeekBar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/pbMP3"
            android:visibility="invisible"/>
    </LinearLayout>

</LinearLayout>

 

MainActivity.java

package com.cookandroid.project13_1;

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

import android.Manifest;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.TextView;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ListView listViewMP3;
    Button btnPlay, btnStop, btnPause;
    TextView tvMP3, tvTime;
    ProgressBar pbMP3;

    ArrayList<String> mp3List;
    String selectedMP3;

    String mp3Path = Environment.getExternalStorageDirectory().getPath()+"/";
    MediaPlayer mPlayer;
    boolean PAUSED = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("간단 MP3 플레이어");
        ActivityCompat.requestPermissions(this, new String[] {android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, MODE_PRIVATE);

        mp3List = new ArrayList<String>();

        File[] listFiles = new File(mp3Path).listFiles();
        String fileName, extName;
        for (File file : listFiles){
            fileName = file.getName();
            extName = fileName.substring(fileName.length()-3);
            if(extName.equals((String)"mp3")){mp3List.add(fileName);}
        }

        listViewMP3 = (ListView) findViewById(R.id.listViewMP3);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, mp3List);
        listViewMP3.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        listViewMP3.setAdapter(adapter);
        listViewMP3.setItemChecked(0, true);

        listViewMP3.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                selectedMP3 = mp3List.get(position);
            }
        });
        selectedMP3 = mp3List.get(0);

        Handler mp3Handler = new Handler(){
            @Override
            public void handleMessage(@NonNull Message msg) {
                SimpleDateFormat timeFormat = new SimpleDateFormat(" mm:ss ");
                pbMP3.setProgress(mPlayer.getCurrentPosition());
                tvTime.setText("진행 시간 : " + timeFormat.format(mPlayer.getCurrentPosition()));
            }
        };

        btnPlay = (Button) findViewById(R.id.btnPlay);
        btnStop = (Button) findViewById(R.id.btnStop);
        btnPause = (Button) findViewById(R.id.btnPause);
        tvMP3 = (TextView) findViewById(R.id.tvMP3);
        tvTime = (TextView) findViewById(R.id.tvTime);
        pbMP3 = (ProgressBar) findViewById(R.id.pbMP3);


        btnPlay.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try{
                    mPlayer = new MediaPlayer();
                    mPlayer.setDataSource(mp3Path+selectedMP3);
                    mPlayer.prepare();
                    mPlayer.start();
                    btnPlay.setClickable(false);
                    btnStop.setClickable(true);
                    btnPause.setClickable(true);
                    tvMP3.setText("실행중인 음악 : "+selectedMP3);

                    new Thread() {
                        public void run() {
                            if (mPlayer == null) return;
                            pbMP3.setMax(mPlayer.getDuration());
                            while (mPlayer.isPlaying()) {
                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        mp3Handler.sendEmptyMessage(0);
                                    }
                                });
                                SystemClock.sleep(200);
                            }
                        }
                    }.start();

                    pbMP3.setVisibility(View.VISIBLE);



                }catch(IOException e){}

                }
        });

        btnPause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!PAUSED){
                    btnPause.setText("이어듣기");
                    mPlayer.pause();
                    PAUSED = true;
                    pbMP3.setVisibility(View.INVISIBLE);

                }else{
                    mPlayer.start();
                    PAUSED = false;
                    pbMP3.setVisibility(View.VISIBLE);
                    btnPause.setText("일시정지");
                    new Thread() {
                        public void run() {
                            if (mPlayer == null) return;
                            pbMP3.setMax(mPlayer.getDuration());
                            while (mPlayer.isPlaying()) {
                                runOnUiThread(new Runnable() {
                                    @Override
                                    public void run() {
                                        mp3Handler.sendEmptyMessage(0);
                                    }
                                });
                                SystemClock.sleep(200);
                            }
                        }
                    }.start();
                }
            }
        });


        btnPause.setClickable(false);

        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mPlayer.stop();
                mPlayer.reset();
                btnPlay.setClickable(true);
                btnStop.setClickable(false);
                btnPause.setClickable(false);
                tvMP3.setText("실행중인 음악 : ");
                pbMP3.setVisibility(View.INVISIBLE);
            }
        });

        btnStop.setClickable(false);


            }
            }

 

 

 

7

activitiy_main.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    map:cameraTargetLat="35.865"
    map:cameraTargetLng="128.593"
    map:cameraZoom="15"
    tools:ignore="MissingClass" />

MainActivity.java

package com.cookandroid.googlemap13_2;

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

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.GroundOverlayOptions;
import com.google.android.gms.maps.model.LatLng;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {
    GoogleMap gMap;
    MapFragment mapFrag;
    GroundOverlayOptions videoMark;
    ArrayList<GroundOverlayOptions> markList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("구글 지도 활용");
        mapFrag = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
        mapFrag.getMapAsync(this);
        markList = new ArrayList<GroundOverlayOptions>();
    }

    @Override
    public void onMapReady(GoogleMap map) {
        gMap = map;
        gMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
        gMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(37.568256, 126.897240), 15));
        gMap.getUiSettings().setZoomControlsEnabled(true);
        gMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
            @Override
            public void onMapClick(LatLng latLng) {
                videoMark = new GroundOverlayOptions().image(BitmapDescriptorFactory.fromResource(R.drawable.ic)).position(latLng, 100f, 100f);
                markList.add(videoMark);
                gMap.addGroundOverlay(videoMark);

            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        menu.add(0,1,0,"위성 지도");
        menu.add(0,2,0,"일반 지도");
        menu.add(0,3,0,"바로전 마크 지우기");
        menu.add(0,4,0,"모든 마크 지우기");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()){
            case 1:
                gMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
                return true;
            case 2:
                gMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
                return true;
            case 3:
                gMap.clear();
                markList.remove(markList.size()-1);
                for(int i=0; i<markList.size(); i++){
                    gMap.addGroundOverlay(markList.get(i));
                }
                return true;
            case 4:
                gMap.clear();
                return true;
        }
        return true;
    }

    @Override
    public void onPointerCaptureChanged(boolean hasCapture) {

    }
}