带音频的ListView不播放
你好,你好吗?
我试着做一个音频列表视图,所有的东西看起来都是按原样流动的,但是当我点击一个列表项时,音频应该会重现,但它似乎“应用程序停止工作”我不明白我的代码有什么问题,有人可以帮我,我有时会崩溃,但我无法解决这个问题。下面是logcat,然后是我的代码,请有人帮我把它弄好。
-谢谢你
Logcat
mainActivity.Class类

public class MainActivity extends AppCompatActivity {
    ListView lv;
    MediaPlayer mp;

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

        lv = findViewById(R.id.lv);
        mp = new MediaPlayer();

        ArrayList<memes> item = new ArrayList<>();

        item.add(new memes("Gemidão", R.raw.gemidaoremix));
        item.add(new memes("Nunca nem vi", R.raw.nuncanemvi));


        ArrayAdapter<memes> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, item);
        lv.setAdapter(adapter);

        lv.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, item));

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view,
                                    int position, long id) {
                playSong(position);

            }
        });
    }


    public void playSong(int songIndex) {

        mp.reset();
        int[] resID = new int[0];
        mp = MediaPlayer.create(this, resID[songIndex]);

        mp.start();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mp.release();
    }


    }

模因类
public class memes{

    private String nome;
    private int resID;

    memes(String nome, int resID){

        this.nome = nome;
        this.resID = resID;
    }

    public String getNome(){
        return nome;
    }

    public int getResId(){
        return resID;
    }

    @Override
    public String toString(){
        return nome;
    }

}

最佳答案

代码的问题是,您正在声明一个未填充的单独原始资源数组。

int[] resID = new int[0];
mp = MediaPlayer.create(this, resID[songIndex]);

解决方案
由于使用arraylist填充listview,因此需要从arraylist本身获取资源。解决方案如下:
public class MainActivity extends AppCompatActivity {

    ListView lv;
    MediaPlayer mp;
    ArrayList<Memes> item;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = findViewById(R.id.lv);
        mp = new MediaPlayer();

        item = new ArrayList<>();

        item.add(new Memes("Gemidão", R.raw.gemidaoremix));
        item.add(new Memes("Nunca nem vi", R.raw.nuncanemvi));


        ArrayAdapter<Memes> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, item);
        lv.setAdapter(adapter);

        lv.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, item));

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view,
                                    int position, long id) {
                playSong(position);

            }
        });
    }

    public void playSong(int songIndex) {
        mp.reset();
        mp = MediaPlayer.create(this, item.get(songIndex).getResId());
        mp.start();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mp.release();
    }


}

07-24 09:45
查看更多