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我嘗試將一個片段導航到另一個片段。在這裏我使用一個按鈕來完成這個過程。當我運行這個時，我在最後得到一個空白屏幕。Android導航一個片段到另一個正在工作，但無法看到其他片段的背景
這些都是我的步驟，
MainActivity.java
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
public class MainActivity extends FragmentActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final int page=2;
final ViewPager pager = (ViewPager) findViewById(R.id.viewPager);
pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
pager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (pager.getCurrentItem()==page) {
return true;
}
return false;
}
});
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return FirstFragment.newInstance("FirstFragment, Instance 1");
case 1: return SecondFragment.newInstance("SecondFragment, Instance 1");
case 2: return ThirdFragment.newInstance("ThirdFragment, Instance 1");
default: return ThirdFragment.newInstance("ThirdFragment, Default");
}
}
@Override
public int getCount() {
return 4;
}
}
}
我想瀏覽的第三片段到第四之一。
activity_main.xml中
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
third_frag.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_red_light" >
<TextView
android:id="@+id/tvFragThird"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textSize="26dp"
android:text="TextView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:id="@+id/printButton"
android:text="Next"/>
</RelativeLayout>
ThirdFragment.java
public class ThirdFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.third_frag, container, false);
TextView tv = (TextView) v.findViewById(R.id.tvFragThird);
tv.setText(getArguments().getString("msg"));
Button button=(Button)v.findViewById(R.id.printButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FourthFragment fourthFragment=new FourthFragment();
Bundle bundle=new Bundle();
bundle.putInt(String.valueOf(FirstFragment.newInstance("Terance")),1);
fourthFragment.setArguments(bundle);
FragmentManager fragmentManager=getFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.viewPager, fourthFragment);
transaction.addToBackStack(null);
transaction.commit();
}
});
return v;
}
public static ThirdFragment newInstance(String text) {
ThirdFragment f = new ThirdFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}
fourth_frag.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_blue_dark">
<TextView
android:id="@+id/tvFragFourth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textSize="26dp"
android:text="TextView" />
</RelativeLayout>
FourthFragment.java
public class FourthFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fourth_frag, container, false);
TextView tv = (TextView) v.findViewById(R.id.tvFragFourth);
tv.setText("Fourth Fragment");
return v;
}
public static FourthFragment newInstance(String text) {
text="Terance";
FourthFragment f = new FourthFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
}
有四個片段的類和我提到只有被用於此目的兩項。當到達第三個片段時，不能將其向左或向右滑動。然後我用一個按鈕去第四個片段。但它不起作用。
對此有任何意見？
謝謝。
爲什麼不告訴viewpager單獨滾動到第4個片段，您可以使用viewpager加載4個片段。 – danypata
@danypata：它有目的，在這個應用程序它應該停下來檢查一些條件。 – Barrier
嘗試與按鈕上的孩子片段管理器點擊 – Abhishek