再次点击以通过导航抽屉退出应用。

huangapple
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英文:

Click again to exit from the app using Navigation drawer

问题

这是翻译好的部分：

  1. private boolean doubleBackToExitPressedOnce = false;
  3. @Override
  4. public void onBackPressed() {
  5.     if (drawer.isDrawerOpen(GravityCompat.START) && doubleBackToExitPressedOnce) {
  6.         super.onBackPressed();
  7.     } else if (drawer.isDrawerOpen(GravityCompat.START)) {
  8.         drawer.closeDrawer(GravityCompat.START);
  9.     } else if (!doubleBackToExitPressedOnce) {
  10.         doubleBackToExitPressedOnce = true;
  11.         Toast.makeText(this, "再按一次返回键退出", Toast.LENGTH_SHORT).show();
  13.         new Handler().postDelayed(new Runnable() {
  14.             @Override
  15.             public void run() {
  16.                 doubleBackToExitPressedOnce = false;
  17.             }
  18.         }, 2000);
  19.     }
  20. }

希望这对你有所帮助。如果有其他疑问，请随时提问。

英文:

I have a problem with this code. I wanna when the drawer is close and the user clicks back the drawer open, and when it opens and the user wanna to exit from the app show message said: "press again to exit". how can I do that with this code?

I wanna it be like this

press back -- open drawer;

press back again -- show message;

press back again -- exit the app;

Here's my code

  1. private boolean doubleBackToExitPressedOnce = false;
  2. @Override
  3. public void onBackPressed() {
  4.     if (drawer.isDrawerOpen(GravityCompat.START) && doubleBackToExitPressedOnce) {
  5.         super.onBackPressed();
  6.     }
  8.     else {
  9.         drawer.openDrawer(GravityCompat.START);
  10.     }
  11. }

And here is the message code and I don't know where to but it

  1. doubleBackToExitPressedOnce = true;
  2.     Toast.makeText(this, "Press again to exit", Toast.LENGTH_SHORT).show();
  4.     new Handler().postDelayed(new Runnable() {
  5.         @Override
  6.         public void run() {
  7.             doubleBackToExitPressedOnce = false;
  8.         }
  9.     }, 2000);

答案1

得分: 1

这应该解决你的问题。

  1.     @Override
  2.     public void onBackPressed() {
  3.         // 如果导航抽屉尚未打开，打开它。
  4.         if (!drawer.isDrawerOpen(GravityCompat.START)) {
  5.             drawer.openDrawer(GravityCompat.START);
  6.         } else if (doubleBackToExitPressedOnce) {
  7.             super.onBackPressed();
  8.         } else {
  9.             doubleBackToExitPressedOnce = true;
  10.             Toast.makeText(this, "再次按下返回键退出", Toast.LENGTH_SHORT).show();
  12.             new Handler().postDelayed(new Runnable() {
  13.                 @Override
  14.                 public void run() {
  15.                     doubleBackToExitPressedOnce = false;
  16.                 }
  17.             }, 2000);
  18.         }
  19.     }
英文:

This should solve your problem.

  1. @Override
  2. public void onBackPressed() {
  3.     // If navigation drawer is not open yet, open it.
  4.     if (!drawer.isDrawerOpen(GravityCompat.START)) {
  5.         drawer.openDrawer(GravityCompat.START);
  6.     } else if (doubleBackToExitPressedOnce) {
  7.         super.onBackPressed();
  8.     } else {
  9.         doubleBackToExitPressedOnce = true;
  10.         Toast.makeText(this, "Press again to exit", Toast.LENGTH_SHORT).show();
  12.         new Handler().postDelayed(new Runnable() {
  13.             @Override
  14.             public void run() {
  15.                 doubleBackToExitPressedOnce = false;
  16.             }
  17.         }, 2000);
  18.     }
  19. }

huangapple
  • 本文由 发表于 2020年10月15日 23:56:09
  • 转载请务必保留本文链接：https://go.coder-hub.com/64375388.html
  • android
  • java
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