Question

我最近开始进行android编程，这对我来说是全新的。我想在一段时间后更新声音ID和可绘制ID，但没有更新@。

我正在使用的时间：

updatetime =  mediaPlayer.getDuration();

这是活动代码：

public class Alpha_Loop extends AppCompatActivity {

ImageView abc,img1;
int i = 0;
int playsound;
Runnable Rn;
int s = 0;
long updatetime;
MediaPlayer mediaPlayer;

//Array of Image1
final int[] ImageArray = {R.drawable.a, R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e,
        R.drawable.f, R.drawable.g, R.drawable.h, R.drawable.i, R.drawable.j, R.drawable.k,
        R.drawable.l, R.drawable.m, R.drawable.n, R.drawable.o, R.drawable.p, R.drawable.q,
        R.drawable.r, R.drawable.s, R.drawable.t, R.drawable.u, R.drawable.v, R.drawable.w,
        R.drawable.x, R.drawable.y, R.drawable.z};

//Array of Image1
final int[] img1Array = {R.drawable.apple, R.drawable.ball, R.drawable.cat, R.drawable.dog, R.drawable.egg,
        R.drawable.fish, R.drawable.goat, R.drawable.hat, R.drawable.insect, R.drawable.jar,
        R.drawable.king, R.drawable.leaf, R.drawable.monkey, R.drawable.nose, R.drawable.ocean,
        R.drawable.parrot, R.drawable.queen, R.drawable.rat, R.drawable.sun, R.drawable.tap,
        R.drawable.umbrella, R.drawable.violin, R.drawable.well, R.drawable.box, R.drawable.yatch,
        R.drawable.zebra};
//Array of wav files
final int[] Soundid = {R.raw.a, R.raw.a, R.raw.b, R.raw.c, R.raw.d, R.raw.e,
        R.raw.f, R.raw.g, R.raw.h, R.raw.i, R.raw.j, R.raw.k,
        R.raw.l, R.raw.m, R.raw.n, R.raw.o, R.raw.p, R.raw.q,
        R.raw.r, R.raw.s, R.raw.t, R.raw.u, R.raw.v, R.raw.w,
        R.raw.x, R.raw.y, R.raw.z};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.alpha__loop);
    abc = findViewById(R.id.abc);
    img1 = findViewById(R.id.img1);
    playsound = Soundid[0];
    abc.setImageResource(R.drawable.a);
    img1.setImageResource(R.drawable.apple);

   mediaPlayer = MediaPlayer.create(Alpha_Loop.this, playsound);
    mediaPlayer.start();
    mediaPlayer.setLooping(false);

    final Handler handler = new Handler();
    Rn = new Runnable() {
        @Override
        public void run() {
            abc.setImageResource(ImageArray[i]);
            i++;
            if (i >= ImageArray.length) {
                i = 0;
            }
            img1.setImageResource(img1Array[i]);
            i++;
            if (i >= img1Array.length) {
                i = 0;
            }
            playsound = Soundid[s];
            s++;
            updatetime =  mediaPlayer.getDuration();
            if (s >= Soundid.length) {
                s = 0;
            }
            handler.postDelayed(Rn, updatetime);
        }

    };
}

}

任何帮助都会对我有所帮助。

Answer 1

处理程序的postDelayed方法中经过的时间，显示了处理程序在调用可运行对象之前需要延迟多长时间（延迟-以毫秒为单位-直到将运行可运行对象为止）。因此，在代码中需要运行可运行对象的部分，请调用handler.post(Rn);以启动您的可运行对象。

Answer 2

我敢肯定，如果您这样做的话，它会起作用：

final Handler handler = new Handler();
Rn = new Runnable() {
    @Override
    public void run() {
        abc.setImageResource(ImageArray[i]);
        i++;
        if (i >= ImageArray.length) {
            i = 0;
        }
        img1.setImageResource(img1Array[i]);
        i++;
        if (i >= img1Array.length) {
            i = 0;
        }
        playsound = Soundid[s];
        s++;
        updatetime =  mediaPlayer.getDuration();
        if (s >= Soundid.length) {
            s = 0;
        }
    }
};
handler.postDelayed(Rn, updatetime);

您的处理程序正在runnable中执行postDelayed u，因此runnable从未执行。

编辑：不要使用首字母大写这样的缩写，因为它违反Java命名约定。

处理程序/ Runnable不更新ImageView和原始资源

2 个答案: