有人可以指出我錯誤的地方嗎?當我按下圖像按鈕時,即使我沒有按下相應的按鈕,它也會首先播放粉紅色電影。我必須按下圖像按鈕兩次以聽到正確的聲音。這發生在頁面第一次加載時,在第一次看起來很好但仍然不應該發生的情況之後。MediaPlayer在第一次點擊時播放錯誤的文件
import android.content.Context;
import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
public class ColorPage extends AppCompatActivity {
Context context = this;
//MediaPlayer mpPurple, mpBlue, mpRed, mpGreen, mpYellow, mpPink;
MediaPlayer media = null;
//private static MediaPlayer media = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_color_page);
ImageButton pinkB = (ImageButton) findViewById(R.id.pinkButton);
ImageButton yellowB = (ImageButton) findViewById(R.id.yellowButton);
ImageButton purpleB = (ImageButton) findViewById(R.id.purpleButton);
ImageButton blueB = (ImageButton) findViewById(R.id.blueButton);
ImageButton greenB = (ImageButton) findViewById(R.id.greenButton);
ImageButton redB = (ImageButton) findViewById(R.id.redButton);
media = MediaPlayer.create(context, R.raw.purpleaudiotest);
purpleB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
if (media.isPlaying()) {
media.stop();
media.release();
media = MediaPlayer.create(context, R.raw.purpleaudiotest);
}
media.start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
media = MediaPlayer.create(context, R.raw.blueaudiotest);
blueB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
if (media.isPlaying()) {
media.stop();
media.release();
media = MediaPlayer.create(context, R.raw.blueaudiotest);
}
media.start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
media = MediaPlayer.create(context, R.raw.redaudiotest);
redB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
if (media.isPlaying()) {
media.stop();
media.release();
media = MediaPlayer.create(context, R.raw.redaudiotest);
}
media.start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
media = MediaPlayer.create(context, R.raw.greenaudiotest);
greenB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
if (media.isPlaying()) {
media.stop();
media.release();
media = MediaPlayer.create(context, R.raw.greenaudiotest);
}
media.start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
media = MediaPlayer.create(context, R.raw.yellowaudiotest);
yellowB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
if (media.isPlaying()) {
media.stop();
media.release();
media = MediaPlayer.create(context, R.raw.yellowaudiotest);
}
media.start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
media = MediaPlayer.create(context, R.raw.pinkaudiotest);
pinkB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
if (media.isPlaying()) {
media.stop();
media.release();
media = MediaPlayer.create(context, R.raw.pinkaudiotest);
}
media.start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
更新:將if語句(所有這些語句)的開頭更改爲如下所示修復了問題。
if (media != null) {
media.stop();
media.release();
media = MediaPlayer.create(context, R.raw.pinkaudiotest);
}