我有活动'A',活动'B',活动'C',活动'D',活动'E',活动'E'。我想退出Activity点击onBackPressed()。当我运行应用程序时,它转到活动“A”它不会退出应用程序。我怎样才能实现这一点。如何在Android中使用onBackPressed()?
这里是我的代码
public class MainActivity extends Activity {
TableLayout table_layout;
EditText firstname_et, lastname_et;
Button addmem_btn;
DatabaseHelper databaseHelper = new DatabaseHelper(this);
protected SQLiteDatabase db;
ProgressDialog PD;
ImageView imgButtonBack;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.performance_report);
table_layout = (TableLayout) findViewById(R.id.tableLayout_PerformanceReport);
//ImageView imgButtonBack;
imgButtonBack = (ImageView)findViewById(R.id.imagBackButton);
imgButtonBack.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(MainActivity.this, Employee_List.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
//finish();
}
});
}
}
@Override
public void onBackPressed()
{
AlertDialog.Builder alertbox = new AlertDialog.Builder(MainActivity.this);
alertbox.setTitle("Do you wish to exit ?");
alertbox.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// finish used for destroyed activity
finish();
}
});
alertbox.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
// Nothing will be happened when clicked on no button
// of Dialog
}
});
alertbox.show();
}
}
感谢欣赏。
添加到交易这个.. getFragmentManager()调用BeginTransaction()加(.....,.....)addToBackStack()。 .commit()这将导致返回到最后一个交易,如果它的第一个它将退出希望它帮助 –
@Itzik萨马拉:感谢回复,对不起,但我没有得到你。 – jvd
[Android - onBackPressed()not working]可能的重复](http://stackoverflow.com/questions/3558385/android-onbackpressed-not-working) – Gattsu