[英]How to make “menu” or “manifest” back button to navigate back to the previous activity
I have 3 different activities. 我有3种不同的活动。 I've created menu xml files to build ActionToolbar, buttons etc., but for "back button" I've found a decision to add such code in manifest: 我已经创建了菜单XML文件来构建ActionToolbar,按钮等,但是对于“后退按钮”,我已经决定在清单中添加此类代码:
android:parentActivityName=".MainActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".MainActivity"/>
The question is how to return on the previous activity which isn't parent activity sometimes. 问题是如何返回有时不是父级活动的上一个活动。 Can I do this with help of menu? 我可以借助菜单来做到这一点吗? I know how to add back button there, but it will be at the end of toolbar's line, not before the activity title. 我知道如何在其中添加后退按钮,但是它将在工具栏行的末尾,而不是活动标题之前。
menu_add_task.xml: menu_add_task.xml:
<?xml version="1.0" encoding="utf-8"?>
<menu
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/doneTask"
android:title="@string/doneTask"
android:icon="@mipmap/ic_done"
app:showAsAction="ifRoom" />
</menu>
activity_add_task.xml activity_add_task.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@color/the_darkest_grey">
</android.support.constraint.ConstraintLayout>
AddTaskActivity class: activity, where should be a back button AddTaskActivity类:活动,应该在后退按钮的位置
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class AddTaskActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_task);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_add_task, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.doneTask:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
Gotcha. 知道了
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class AddTaskActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_task);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_add_task, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case android.R.id.home:
finish();
return true;
case R.id.doneTask:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
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