我有三个页面Splash_Activity,Login_Activity,Activity_One安卓:如何启动两项活动
活动流Splash_Activity - > Login_Activity - > Activity_One。在这种情况下,我检查.db文件中存在或不是我的始终启动应用程序的Splash_Activity。
我把条件是否存在名为.db然后去Activity_One 如果没有的话去Login_Activity。
但是,当我在按钮删除.db文件的问题点击.db文件被正确删除,显示登录页面。
当我不存在登录时应用程序,我再次启动应用程序前两点三倍运行,并检查.db文件不可用,则去到登录页面,但之后它去Activity_One。为什么出现这种情况
这个闪屏
public class Splash_Screen extends RootActivity
{
MyDbHelper dbhelper ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.splash_page);
Thread loading = new Thread() {
public void run()
{
try
{
File database=getApplicationContext().getDatabasePath("ClassNKK.db");
if (!database.exists()) {
// Database does not exist so copy it from assets here
Log.i("Database", "Not Found");
try
{
sleep(2000);
Intent main = new Intent(Splash_Screen.this, Login_Screen.class);
startActivity(main);
Log.e("DB "," is null !!!");
}
catch (Exception e) {
e.printStackTrace();
}
}
else {
Log.i("Database", "Found");
try {
sleep(2000);
Intent main = new Intent(Splash_Screen.this, AllPosts_Page.class);
startActivity(main);
Log.e("DB ", " is null !!!");
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (SQLiteException e) {
e.printStackTrace();
}
}
};
loading.start();
}
}
而且Activity_One页面上此注销按钮
imgBtn_LogOut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File database = getApplicationContext().getDatabasePath(dbhelper.DATABASE_NAME);
if (!database.exists()) {
Log.e("Database", "Not Found");
} else {
Log.e("Database", "Found");
ctx.deleteDatabase(dbhelper.DATABASE_NAME);
Log.e("Database", " Deleted Completeley !!!");
File dir = new File(Environment.getExternalStorageDirectory() + "classnkk_images");
DeleteRecursive(dir);
Intent i = new Intent(Filter_Screen.this, Login_Screen.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
finish();
}
}
});
当您按下注销按钮你有什么logcat的输出???它输出“Log.e(”数据库“,”发现“);”和“Log.e(”Database“,”Deleted Completeley !!!“);” – RajSharma
Log.e(“Database”,“Deleted Completeley !!!”);“ –