如何操作后退按钮？

Question

当我按下后退按钮时，我希望它能像 intent 一样工作，转到某些特定 activity 并刷新页面。我发现一些代码以这种方式工作，但找不到完全符合我要求的代码。提前致谢。

Answer 1

只需覆盖 activity 中的 onBackPressed 方法，如：

@Override
public void onBackPressed() {
/** Write your code here that you want to execute on Backpress**/        
}

不要在 onBackPressed 中使用 super.onBackPressed() 因为它会调用父 activity onBackPressed 方法并终止当前 activity.

Answer 2

在你的activity中，你需要使用onBackPressed()

@Override
public void onBackPressed() {

    //You'll put your code here, in my example below, i check if the user is sure

    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Are you sure you want to cancel?")
            .setCancelable(false)
            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    YourActivity.this.finish();
                }
            })
            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
    AlertDialog alert = builder.create();
    alert.show();
}

Answer 3

小心 Android 上的后退导航。有几条规则需要遵守：https://developer.android.com/training/implementing-navigation/temporal https://developer.android.com/training/design-navigation/ancestral-temporal

Answer 4

试试下面的代码..

@Override
    public void onBackPressed() {             
        Log.d(TAG, "onBackPressed: GoTo NextActivity");
        Intent intent = new Intent(getApplicationContext(),NextActivity.class); // Replace the NextActivity.class with the Activity you wish to open..
        startActivity(intent);
    }

如何操作后退按钮？

How to manipulate back button?

android

onbackpressed