我正在制作游戏,我有一个选项页面可以打开或关闭音乐.我想覆盖后退按钮,以便它返回到主页,你会明白为什么当你看到我的代码时：
public class OptionsActivity extends Activity {
private boolean isMyServiceRunning(String serviceCanonicalClassName) {
ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (serviceCanonicalClassName.equals(service.service.getClassName())) {
return true;
}
}
return false;
}
Intent i; // Handles MyMusicService.java
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.options);
final TextView tSound = (TextView) findViewById(R.id.textView2);
final Button saveBtn = (Button) findViewById(R.id.optSaveBtn);
final Button tblBtn = (Button) findViewById(R.id.tableBtn);
i=new Intent(this,MyMusicService.class);
final ToggleButton soundOption = (ToggleButton) findViewById(R.id.soundPref);
boolean musicPlays = isMyServiceRunning(MyMusicService.class.getCanonicalName());
soundOption.setChecked(musicPlays);
if(musicPlays==true){
tSound.setText("On");
}
if(musicPlays==false) {
tSound.setText("Off");
}
soundOption.setonClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on clicks to control sound being on and off.
if(soundOption.isChecked()) {
Toast.makeText(OptionsActivity.this,"Music on.",Toast.LENGTH_SHORT).show();
startService(i);
Intent i = new Intent(OptionsActivity.this,OptionsActivity.class);
startActivity(i);
}
else {
if(stopService(i)==true){
soundOption.setChecked(false);
stopService(i);
Toast.makeText(OptionsActivity.this,"Music off.",Toast.LENGTH_SHORT).show();
Intent i = new Intent(OptionsActivity.this,OptionsActivity.class);
startActivity(i);
}
}
}
});
tblBtn.setonClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent tblView = new Intent(OptionsActivity.this,sqlView.class);
startActivity(tblView);
}
});
saveBtn.setonClickListener(new View.OnClickListener(){
public void onClick(View v) {
switch (v.getId()){
case R.id.optSaveBtn: //Determine what will happen when the user presses the "Submit button".
boolean optionsWork = true;
try{
String sound = tSound.getText().toString();
optionsDB entry = new optionsDB(OptionsActivity.this); //Creating a new instance of MasterMind game
entry.open();
entry.createOptionEntry(sound); //Passing both strings
entry.close();
}catch (Exception e){ //Creating an error message if for some reason the app cannot transfer data to the Database.
Toast.makeText(OptionsActivity.this,"Error",Toast.LENGTH_SHORT).show();
}
finally { //Creating an AlertDialog Box when the user presses the Submit button.
if (optionsWork){
Toast.makeText(OptionsActivity.this,"Settings Saved",Toast.LENGTH_SHORT).show();
}
}
break;
}
}
});
}
}
任何帮助都会非常棒,谢谢.
更新：添加此,仍然不起作用：
@Override
public boolean onKeyDown(int keyCode,KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK ) {
// do something on back.
return true;
}
Intent i = new Intent(OptionsActivity.this,MainActivity.class);
startActivity(i);
return super.onKeyDown(keyCode,event);
}
解决方法
覆盖Activity的onKeyDown(),这里你可以处理各种键或者也可以覆盖onBackPresses()
@Override
public boolean onKeyDown(int keyCode,KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK ) {
// do something on back.
return true;
}
return super.onKeyDown(keyCode,event);
}