我有两项活动（activity_1和activity_2）。我在第二个活动中有一个CustomPagerAdapter，因此需要15秒才能启动。
问题是，当我尝试启动第二个活动时，它会显示黑屏大约15秒（加载所有方法和数据所需的时间）。我想向用户展示一个进度条，甚至只是一个图像或一个动画 -
除了简单的黑屏外什么都没有。
我发现了很多像这样的问题，但没有人使用寻呼机适配器，这对我来说很难。
这是第二项活动：
public class hiphopvol1 extends Activity {
MediaPlayer[] array = new MediaPlayer[66],array2 = new MediaPlayer[70];
SoundPool[] soundPool=new SoundPool[66],soundPool2=new SoundPool[70];
int[] sm=new int[66],sm2=new int[70];
public void backtoback(View v) {
Intent readMore = new Intent(v.getContext(), realmusic.class);
v.getContext().startActivity(readMore);
for(int i=0;i<66;i++){
if(array[i].isPlaying())
array[i].stop();
array[i].reset();
array[i].release();
soundPool[i].stop(sm[i]);
soundPool[i].release();
}
for(int i=0;i<70;i++){
if(array2[i].isPlaying())
array2[i].stop();
array2[i].reset();
array2[i].release();
soundPool2[i].stop(sm2[i]);
soundPool2[i].release();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.slider_hiphop);
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager2);
viewPager.setAdapter(new CustomPagerAdapter3());
}
public class CustomPagerAdapter3 extends PagerAdapter {
// private SoundPool[] soundPool=new SoundPool[66],soundPool2=new SoundPool[70];
// private int[] sm=new int[66],sm2=new int[70];
private int[] streamid=new int[66],streamid2=new int[70];
boolean loaded = false;private float volume;
@Override
public int getCount() {
return 2;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((View) object);
}
@Override
public void destroyItem(View view, int value, Object object) {
((ViewPager) view).removeView((View) object);
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public Object instantiateItem(final View collection, int position) {
final Button[] buttons=new Button[66],buttons2=new Button[70];
final CheckBox[] checkboxes=new CheckBox[66],checkboxes2=new CheckBox[70];
// final MediaPlayer[] array = new MediaPlayer[66],array2 = new MediaPlayer[70];
for(int s=0;s<66;s++){array[s]= new MediaPlayer();}for(int s=0;s<70;s++){array2[s]= new MediaPlayer();}
LayoutInflater layoutInflater = (LayoutInflater) collection.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int v=0;
final AssetFileDescriptor[] descripto =new AssetFileDescriptor[66],descripto2 =new AssetFileDescriptor[70];
View view;
LinearLayout container,container2;
AudioManager audioManager = (AudioManager) collection.getContext().getSystemService(collection.getContext().AUDIO_SERVICE);
float actualVolume = (float) audioManager
.getStreamVolume(AudioManager.STREAM_MUSIC);
float maxVolume = (float) audioManager
.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
volume = actualVolume / maxVolume;
switch (position) {
case 0:
default:
view=layoutInflater.inflate(R.layout.hhv1_s1,null);
container = (LinearLayout)view.findViewById(R.id.container);
for(int s=0;s<66;s++) {
soundPool[s] = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
soundPool[s].setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener() {
@Override
public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
loaded = true;
}
});
try {
if(s<30)
descripto[s]= collection.getContext().getAssets().openFd("hhv1/hhv1drums/" +(s+1)+".ogg");
else if(s>=30 && s <44)
descripto[s]= collection.getContext().getAssets().openFd("hhv1/hhv1bass/" +(s+1)+".ogg");
else if(s>=44 && s<49)
descripto[s]= collection.getContext().getAssets().openFd("hhv1/hhv1guitar/" +(s+1)+".ogg");
else descripto[s]= collection.getContext().getAssets().openFd("hhv1/hhv1keys/" +(s+1)+".ogg");
} catch (IOException e) {}
sm[s] = soundPool[s].load(descripto[s],1);
}
for(int k=1;k<133;k+=2){
final View addView = layoutInflater.inflate(R.layout.button, null);
addView.setPadding(0,0,0,30);
CheckBox textOut = (CheckBox) addView.findViewById(R.id.cb);
Button buttonRemove = (Button)addView.findViewById(R.id.b);
textOut.setId((k+1));buttonRemove.setId(k);
container.addView(addView);
buttons[v]=((Button) view.findViewById(buttonRemove.getId()));
checkboxes[v] = ((CheckBox) view.findViewById(textOut.getId()));
if(v<30) buttons[v].setText("Drum "+(v+1));
else if(v>=30 && v <44)buttons[v].setText("Bass "+(v+1));
else if(v>=44 && v<49)buttons[v].setText("Guitar "+(v+1));
else buttons[v].setText("Keys "+(v+1));
buttons[v].setId(k);
buttons[v].setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(final View v){
if (array[(v.getId()-1)/2].isPlaying()) {
array[(v.getId()-1)/2].pause();
array[(v.getId()-1)/2].seekTo(0);
array[(v.getId()-1)/2].reset();
buttons[(v.getId()-1)/2].setBackgroundResource(R.drawable.myrect3);
return;}
array[(v.getId()-1)/2].reset();
try {
array[(v.getId()-1)/2].setDataSource(descripto[(v.getId()-1)/2].getFileDescriptor(), descripto[(v.getId()-1)/2].getStartOffset(), descripto[(v.getId()-1)/2].getLength());
array[(v.getId()-1)/2].prepare();
} catch (IOException e) {}
array[(v.getId()-1)/2].setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
mp.reset();
buttons[(v.getId()-1)/2].setBackgroundResource(R.drawable.myrect3);
};});
array[(v.getId()-1)/2].start();
buttons[(v.getId()-1)/2].setBackgroundResource(R.drawable.myrect4);
}
});
checkboxes[v].setId((k+1));
checkboxes[v].setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(final View v){
if (checkboxes[(v.getId()/2)-1].isChecked()) {
if (loaded) {
if(array[(v.getId()/2)-1].isPlaying()){
array[(v.getId()/2)-1].pause();
array[(v.getId()/2)-1].seekTo(0);
array[(v.getId()/2)-1].reset();
buttons[(v.getId()/2)-1].setBackgroundResource(R.drawable.myrect3);}
streamid[(v.getId()/2)-1] = soundPool[(v.getId()/2)-1].play(sm[(v.getId()/2)-1], volume, volume, 1, 100, 1f);
v.setBackgroundResource(R.drawable.myrect4);
}
} else {
soundPool[(v.getId()/2)-1].stop(streamid[(v.getId()/2)-1]);
soundPool[(v.getId()/2)-1].setLoop(streamid[(v.getId()/2)-1],0);
v.setBackgroundResource(R.drawable.myrect3);
}
}
});
v++;}
break;
case 1:
view = layoutInflater.inflate(R.layout.hhv1_s2, null);
container2 = (LinearLayout)view.findViewById(R.id.container);
for(int s=0;s<70;s++) { soundPool2[s] = new SoundPool(10, AudioManager.STREAM_MUSIC, 0);
soundPool2[s].setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener() {
@Override
public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
loaded = true;
}
});}
for (int i=0;i<70;i++){
try {
if(i<19)
descripto2[i]= collection.getContext().getAssets().openFd("hhv1/hhv1synth/" +(i+1)+".ogg");
else if(i>=19 && i <27)
descripto2[i]= collection.getContext().getAssets().openFd("hhv1/hhv1strings/" +(i+1)+".ogg");
else if(i>=27 && i<45)
descripto2[i]= collection.getContext().getAssets().openFd("hhv1/hhv1sequence/" +(i+1)+".ogg");
else if(i>=45 && i<54)
descripto2[i]= collection.getContext().getAssets().openFd("hhv1/hhv1pad/" +(i+1)+".ogg");
else if(i>=54 && i<56)
descripto2[i]= collection.getContext().getAssets().openFd("hhv1/hhv1brass/" +(i+1)+".ogg");
else descripto2[i]= collection.getContext().getAssets().openFd("hhv1/hhv1fx/" +(i+1)+".ogg");
} catch (IOException e) {}
sm2[i] = soundPool2[i].load(descripto2[i],1);}
for(int k=1;k<141;k+=2){
final View addView2 = layoutInflater.inflate(R.layout.button, null);
addView2.setPadding(0,0,0,30);
CheckBox textOut = (CheckBox) addView2.findViewById(R.id.cb);
Button buttonRemove = (Button)addView2.findViewById(R.id.b);
textOut.setId((k+1));buttonRemove.setId(k);
container2.addView(addView2);
buttons2[v]=((Button) view.findViewById(buttonRemove.getId()));
checkboxes2[v] = ((CheckBox) view.findViewById(textOut.getId()));
v++;}
v=0;
for(int j=1;j<141;j+=2){
if(v<19) buttons2[v].setText("Synth "+(v+1));
else if(v>=19 && v <27)buttons2[v].setText("Strings "+(v+1));
else if(v>=27 && v<45)buttons2[v].setText("Sequence "+(v+1));
else if(v>=45 && v<54)buttons2[v].setText("Pad "+(v+1));
else if(v>=54 && v<56)buttons2[v].setText("Brass "+(v+1));
else buttons2[v].setText("Fx "+(v+1));
buttons2[v].setId(j);
buttons2[v].setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(final View v){
if (array2[(v.getId()-1)/2].isPlaying()) {
array2[(v.getId()-1)/2].pause();
array2[(v.getId()-1)/2].seekTo(0);
array2[(v.getId()-1)/2].reset();
buttons2[(v.getId()-1)/2].setBackgroundResource(R.drawable.myrect3);
return;}
array2[(v.getId()-1)/2].reset();
try {
array2[(v.getId()-1)/2].setDataSource(descripto2[(v.getId()-1)/2].getFileDescriptor(), descripto2[(v.getId()-1)/2].getStartOffset(), descripto2[(v.getId()-1)/2].getLength());
array2[(v.getId()-1)/2].prepare();
} catch (IOException e) {}
array2[(v.getId()-1)/2].setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
mp.reset();
buttons2[(v.getId()-1)/2].setBackgroundResource(R.drawable.myrect3);
};});
array2[(v.getId()-1)/2].start();
buttons2[(v.getId()-1)/2].setBackgroundResource(R.drawable.myrect4);
}
});
checkboxes2[v].setId((j+1));
checkboxes2[v].setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
if (checkboxes2[(v.getId()/2)-1].isChecked()) {
if (loaded) {
if(array2[(v.getId()/2)-1].isPlaying()){
array2[(v.getId()/2)-1].pause();
array2[(v.getId()/2)-1].seekTo(0);
array2[(v.getId()/2)-1].reset();
buttons2[(v.getId()/2)-1].setBackgroundResource(R.drawable.myrect3);}
streamid2[(v.getId()/2)-1] = soundPool2[(v.getId()/2)-1].play(sm2[(v.getId()/2)-1], volume, volume, 1, 100, 1f);
v.setBackgroundResource(R.drawable.myrect4);
}
} else {
soundPool2[(v.getId()/2)-1].stop(streamid2[(v.getId()/2)-1]);
soundPool2[(v.getId()/2)-1].setLoop(streamid2[(v.getId()/2)-1],0);
v.setBackgroundResource(R.drawable.myrect3);
}}});v++;}
break;
}
((ViewPager) collection).addView(view);
return view;
}
}
}