我正在製作遊戲,並且有一個選項頁面可以打開或關閉音樂。我想重寫後退按鈕,使其返回到主頁,你就會明白爲什麼當你看到我的代碼:Android:更改後退按鈕的操作
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;
}
}
});
}
}
任何幫助將是非常美妙謝謝。
更新:新增此,仍然不能正常工作:
@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);
}
感謝您的評論,我已經嘗試過這一點,但我一直在進入選項類時一直收到強制關閉。有任何想法嗎? – 2012-03-27 11:28:34
跟蹤你的Logcat,看看到底發生了什麼錯誤? – 2012-03-27 11:39:20
好的,它不會崩潰了......現在只是沒有做任何事情,哈哈。 你能檢查我的修改答案嗎? – 2012-03-27 12:08:12