如何从自身中删除片段
How to remove a fragment from within itself
在我的应用程序中,我有一个片段 ActivityFragment
的实例,当按下按钮 addActivity
时动态添加该片段。每个 ActivityFragment
中都有一个 delete_button
,我在 ActivityFragment
class 中为这个按钮设置了一个 onClickListener。按下 delete_button
时,我想从 onClick 方法中删除片段。当我创建 ActivityFragment
对象并将其添加到片段 class 之外的方法中的 activity 时,我将如何着手执行此操作?我应该为 .remove()
使用哪个字段?
注意 delete_button
应该只删除它所在片段的实例。
这是我的 MainActivity.java
和 ActivityFragment
class。 addActivity
按钮在底部:
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public static class ActivityFragment extends Fragment {
// @Nullable is used because the method may return a null value
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
final View fragment1 = inflater.inflate(R.layout.activity_fragment, container, false);
Button edit_button = (Button) fragment1.findViewById(R.id.edit_button);
Button delete_button = (Button) fragment1.findViewById(R.id.delete_button);
edit_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TextView activityText = (TextView) getView().findViewById(R.id.activity_text);
activityText.setText("success");
}
});
delete_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getFragmentManager().beginTransaction()
.remove().commit();
}
});
return fragment1;
}
}
public void addActivity(View view) {
ActivityFragment myFragment = new ActivityFragment();
getFragmentManager().beginTransaction()
.add(R.id.fragment_container, myFragment).commit();
}
}
您可以像这样删除片段实例
delete_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getFragmentManager().beginTransaction()
.remove(ActivityFragment.this).commit();
}
});
可以这样删除片段:
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
MyFragment myFragment = new MyFragment();
fragmentTransaction.remove(myFragment).commit();
此处 myFragment 是您要从当前上下文或当前 activity.
中删除的 "FRAGMENT"
在我的应用程序中,我有一个片段 ActivityFragment
的实例,当按下按钮 addActivity
时动态添加该片段。每个 ActivityFragment
中都有一个 delete_button
,我在 ActivityFragment
class 中为这个按钮设置了一个 onClickListener。按下 delete_button
时,我想从 onClick 方法中删除片段。当我创建 ActivityFragment
对象并将其添加到片段 class 之外的方法中的 activity 时,我将如何着手执行此操作?我应该为 .remove()
使用哪个字段?
注意 delete_button
应该只删除它所在片段的实例。
这是我的 MainActivity.java
和 ActivityFragment
class。 addActivity
按钮在底部:
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public static class ActivityFragment extends Fragment {
// @Nullable is used because the method may return a null value
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
final View fragment1 = inflater.inflate(R.layout.activity_fragment, container, false);
Button edit_button = (Button) fragment1.findViewById(R.id.edit_button);
Button delete_button = (Button) fragment1.findViewById(R.id.delete_button);
edit_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TextView activityText = (TextView) getView().findViewById(R.id.activity_text);
activityText.setText("success");
}
});
delete_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getFragmentManager().beginTransaction()
.remove().commit();
}
});
return fragment1;
}
}
public void addActivity(View view) {
ActivityFragment myFragment = new ActivityFragment();
getFragmentManager().beginTransaction()
.add(R.id.fragment_container, myFragment).commit();
}
}
您可以像这样删除片段实例
delete_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getFragmentManager().beginTransaction()
.remove(ActivityFragment.this).commit();
}
});
可以这样删除片段:
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
MyFragment myFragment = new MyFragment();
fragmentTransaction.remove(myFragment).commit();
此处 myFragment 是您要从当前上下文或当前 activity.
中删除的 "FRAGMENT"