大家好，在我的应用程序中，有一个声音在应用程序启动时播放。我想让人们可以选择从主要活动设置屏幕中静音。
******使用给出的答案编辑****** 所以我在我的主要活动中创建了一个设置方法，现在启动一个名为Main2Activity的新活动，一旦我使其正常工作，这将成为我的设置活动。
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater=getMenuInflater();
inflater.inflate(R.menu.menuitem, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.Settings:
///No longer inflates settings xml.. Starts new settings activity instead
startactivity(new Intent(MainActivity.this,Main2Activity.class))
break;
}
return super.onOptionsItemSelected(item);
}
接下来我有我的媒体播放器类
public class harropMediaplayer {
MediaPlayer mp;
String media;
public harropMediaplayer(String media){
this.media = media;
}
public void plysound() {
///My media player is now stored globally as suggested
mp = App_Objects.mp;
String j =
media.toString();
Log.i("Url", j);
try {
mp.setDataSource(j);
} catch (IOException e) {
e.printStackTrace();
}
try {
mp.prepare();
} catch (IOException e) {
e.printStackTrace();
}
Log.i("Sound playing", "Ok");
mp.start();
}
public void stopplying(){
mp.stop();
mp.release();
}
正如答案所示，我现在疯了，所以可以使用名为App_Objects的约束类来访问媒体播放器。
public class App_Objects {
//This is where i store my media player
public static MediaPlayer mp = new MediaPlayer();
}
接下来是我的新SettingsActivity取代了我的inflate视图
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
final CheckBox btnradio = findViewById(R.id.btnmute);
SharedPreferences sharedpreferences = getSharedPreferences("myPreference", Context.MODE_PRIVATE);
final SharedPreferences.Editor editor = sharedpreferences.edit();
btnradio.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (btnradio.isChecked()){
editor.putBoolean("soundMute", b);
editor.apply();
Log.i( "onCheckedChanged: ","Activated");
}
else {
editor.clear();
editor.apply();
Log.i("onCheckChanged: ","Deactivated");
}
}
});
}
最后是我的启动活动，其中启动声音通过firebase网址播放，我再次添加了下面给出的答案。包括静音的方法
setContentView(R.layout.activity_splash__screen);
database = FirebaseDatabase.getInstance();
reference = database.getReference().child("tvthemetunes");
getthemetune();
}
public void getthemetune() {
Log.i ("Url Grab ", "Started");
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.i("Url Grab", "Searching database");
long childrenCount = dataSnapshot.getChildrenCount();
int count = (int) childrenCount;
int randomNumber = new Random().nextInt(count);
//Your random themeTune will be stored here
for(DataSnapshot snap : dataSnapshot.getChildren())
{
int i = 0;
if(i == randomNumber)
{
Themetune = snap.getValue(String.class);
try {
mp = new harropMediaplayer(Themetune);
((TextView) findViewById(R.id.version)).setText("" + getPackageManager().getPackageInfo(getPackageName(), 0).versionName);
ImageView view = findViewById(R.id.splash);
ImageView view1 = findViewById(R.id.rain);
Animation animFadeIn = AnimationUtils.loadAnimation(Splash_Screen.this, R.anim.fadein);
animFadeIn.reset();
mp.plysound();
///HERE IS WHERE I CALL MY NEW METHOD
volumeSetting();
view1.clearAnimation();
view1.startAnimation(animFadeIn);
RotateAnimation anim = new RotateAnimation(0.0f,
360.0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
//Setup anim with desired properties
anim.setInterpolator(new LinearInterpolator());
anim.setRepeatCount(Animation.RELATIVE_TO_SELF);
//Repeat animation indefinitely
anim.setDuration(1200); //Put desired duration per anim cycle here, in milliseconds
//Start animation
view.startAnimation(anim);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
int secondsDelayed = 2;
new Handler().postDelayed(new Runnable() {
public void run() {
startActivity(new Intent(Splash_Screen.this,
MainActivity.class));
finish();
mp.stopplying();
}
}, secondsDelayed * 2000);
break;
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
private void volumeSetting(){
////MY NEW VOLUME MUTE METHOD INCLUDING THE FETCH SHARED PREF
SharedPreferences sharedpreferences = getSharedPreferences("myPreference", Context.MODE_PRIVATE);
boolean bnSoundMute = sharedpreferences.getBoolean("soundMute",true);
if(bnSoundMute){
App_Objects.mp.setVolume(0,0); // for Mute
}else{
App_Objects.mp.setVolume(1,1);// for Unmute or full volume
}
}
}
但现在声音接缝要静音了。从一开始，如果我转到我的设置活动并单击静音启动复选框，然后重新启动应用程序。该应用程序崩溃了，在我的控制台中给我致命
AndroidRuntime: FATAL EXCEPTION: main
Process: h20music.p9p.harrop99.H20DroidApp_Amazon, PID: 2549
java.lang.IllegalStateException
at android.media.MediaPlayer.nativeSetDataSource(Native Method)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1078)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1039)
at h20music.p9p.harrop99.H20DroidApp_Amazon.harropMediaplayer.plysound(harropMediaplayer.java:29)
at h20music.p9p.harrop99.H20DroidApp_Amazon.Splash_Screen$1.onDataChange(Splash_Screen.java:84)
at com.google.android.gms.internal.zzeeq.zza(Unknown Source)
at com.google.android.gms.internal.zzegl.zzbwe(Unknown Source)
at com.google.android.gms.internal.zzegr.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
答案 0 :(得分：3)
我知道你想做什么。你可以通过使用声明媒体播放器静态来实现这一点。下面是您可以实现此目的的方法之一，您可以很好地构建此代码。我没有详细编写代码。
创建AppConstants课程并定义MediaPlayer staticaly。
public class AppConstants{
public static MediaPlayer mp = new MediaPlayer();
}
创建SettingActivity活动类，您可以在其中为soundMute选项设置共享偏好值true / false。
public class SettingActivity{
SharedPreferences sharedpreferences = getSharedPreferences("myPreference", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedpreferences.edit();
btnradio.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
editor.putBoolean("soundMute", b);
editor.apply();
}
});
}
创建SplashActivity活动类，您可以在其中读取共享偏好以静音媒体播放器。
public class SplashActivity{
SharedPreferences sharedpreferences = getSharedPreferences("myPreference", Context.MODE_PRIVATE);
boolean bnSoundMute = sharedpreferences.getBoolean("soundMute",true);
if(bnSoundMute){
AppConstants.mp.setVolume(0,0); // for Mute
}else{
AppConstants.mp.setVolume(1,1); // for Unmute or full volume
}
try {
AppConstants.mp.prepare();
} catch (IOException e) {
e.printStackTrace();
}
AppConstants.mp.start();
}