Question

在viewPage上更改TextView时，TextView值永远不会更新。对它的引用解析或似乎但是在将可见性设置为false或使用setText后，我看不到视图中的更改。

我可能会发现这一切都是错误的。感谢任何帮助。

Main.java

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.AlertDialog;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.DialogInterface;
import android.media.MediaPlayer;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

public class Main extends FragmentActivity implements TabListener 
{
    RelativeLayout layout_joystick;
    RelativeLayout layout_left_right_joy;
    ImageView image_joystick, image_border;
    TextView textView1, textView2, textView3, textView4, textView5,     textView6,textView7,textView8,textView9,textView10;
    TextView debugLabel;
    Boolean debug;
    JoyStickClass js;
    RotationStickClass js2;
    private ViewPager viewPager;
    private TabPagerAdapter tabPagerAdapter;



    public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);

    //Removes Title
    this.requestWindowFeature(Window.FEATURE_NO_TITLE);
    //Remove notification bar
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.main);
    LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    final ViewGroup vi = (ViewGroup)inflater.inflate(R.layout.first_tab, null, false);

    textView1 = (TextView)vi.findViewById(R.id.textView1);
    textView2 = (TextView)vi.findViewById(R.id.textView2);
    textView3 = (TextView)vi.findViewById(R.id.textView3);
    textView4 = (TextView)vi.findViewById(R.id.textView4);
    textView5 = (TextView)vi.findViewById(R.id.textView5);

    textView6 = (TextView)vi.findViewById(R.id.textView6);
    textView7 = (TextView)vi.findViewById(R.id.textView7);
    textView8 = (TextView)vi.findViewById(R.id.textView8);
    textView9 = (TextView)vi.findViewById(R.id.textView9);
    textView10 = (TextView)vi.findViewById(R.id.textView10);

    debugLabel = (TextView)findViewById(R.id.debugLabel);


    viewPager = (ViewPager) findViewById(R.id.viewPager);
    tabPagerAdapter = new TabPagerAdapter(getSupportFragmentManager());
    viewPager.setAdapter(tabPagerAdapter);

    //Fragment vif = tabPagerAdapter.getItem(1);
    //View vi2 = vif.getView();
    //textView2 = (TextView) vi2.findViewById(R.id.textView2);
    //textView2.setText("Does this work");

    layout_joystick = (RelativeLayout)findViewById(R.id.layout_joystick);
    layout_left_right_joy = (RelativeLayout)findViewById(R.id.layout_joystick2);

    js = new JoyStickClass(getApplicationContext(), layout_joystick, R.drawable.image_button);
    js.setStickSize(75, 75);
    js.setLayoutSize(250,250);
    js.setLayoutAlpha(250);
    js.setStickAlpha(100);
    js.setOffset(30);
    js.setMinimumDistance(0);

    js2 = new RotationStickClass(getApplicationContext(), layout_left_right_joy, R.drawable.image_button);
    js2.setStickSize(75, 75);
    js2.setLayoutSize(250, 250);
    js2.setLayoutAlpha(250);
    js2.setStickAlpha(100);
    js2.setOffset(30);
    js2.setMinimumDistance(0);

    layout_joystick.setOnTouchListener(new OnTouchListener() 
    {
        public boolean onTouch(View arg0, MotionEvent arg1) {
            js.drawStick(arg1);
            if(arg1.getAction() == MotionEvent.ACTION_DOWN
                    || arg1.getAction() == MotionEvent.ACTION_MOVE) {
                textView1.setText("X : " + String.valueOf(js.getX()));
                textView2.setText("Y : " + String.valueOf(js.getY()));
                textView3.setText("Angle : " + String.valueOf(js.getAngle()));
                textView4.setText("Distance : " + String.valueOf(js.getDistance()));

                int direction = js.get8Direction();
                if(direction == JoyStickClass.STICK_UP) {
                    textView5.setText("Direction : Up");
                } else if(direction == JoyStickClass.STICK_UPRIGHT) {
                    textView5.setText("Direction : Up Right");
                } else if(direction == JoyStickClass.STICK_RIGHT) {
                    textView5.setText("Direction : Right");
                } else if(direction == JoyStickClass.STICK_DOWNRIGHT) {
                    textView5.setText("Direction : Down Right");
                } else if(direction == JoyStickClass.STICK_DOWN) {
                    textView5.setText("Direction : Down");
                } else if(direction == JoyStickClass.STICK_DOWNLEFT) {
                    textView5.setText("Direction : Down Left");
                } else if(direction == JoyStickClass.STICK_LEFT) {
                    textView5.setText("Direction : Left");
                } else if(direction == JoyStickClass.STICK_UPLEFT) {
                    textView5.setText("Direction : Up Left");
                } else if(direction == JoyStickClass.STICK_NONE) {
                    textView5.setText("Direction : Center");
                }
            } else if(arg1.getAction() == MotionEvent.ACTION_UP) {
                textView1.setText("X :");
                textView2.setText("Y :");
                textView3.setText("Angle :");
                textView4.setText("Distance :");
                textView5.setText("Direction :");
            }
            tabPagerAdapter.notifyDataSetChanged();


            return true;
        }
    });

    layout_left_right_joy.setOnTouchListener(new OnTouchListener() 
    {
        public boolean onTouch(View arg0, MotionEvent arg1) {
            js2.drawStick(arg1);
            if(arg1.getAction() == MotionEvent.ACTION_DOWN
                    || arg1.getAction() == MotionEvent.ACTION_MOVE) {
                textView6.setText("X : " + String.valueOf(js2.getX()));
                textView7.setText("Y : " + String.valueOf(js2.getY()));
                textView8.setText("Angle : " + String.valueOf(js2.getAngle()));
                textView9.setText("Distance : " + String.valueOf(js2.getDistance()));

                int direction = js2.get8Direction();
                if(direction == JoyStickClass.STICK_UP) {
                    textView10.setText("Direction : Up");
                } else if(direction == JoyStickClass.STICK_UPRIGHT) {
                    textView10.setText("Direction : Up Right");
                } else if(direction == JoyStickClass.STICK_RIGHT) {
                    textView10.setText("Direction : Right");
                } else if(direction == JoyStickClass.STICK_DOWNRIGHT) {
                    textView10.setText("Direction : Down Right");
                } else if(direction == JoyStickClass.STICK_DOWN) {
                    textView10.setText("Direction : Down");
                } else if(direction == JoyStickClass.STICK_DOWNLEFT) {
                    textView10.setText("Direction : Down Left");
                } else if(direction == JoyStickClass.STICK_LEFT) {
                    textView10.setText("Direction : Left");
                } else if(direction == JoyStickClass.STICK_UPLEFT) {
                    textView10.setText("Direction : Up Left");
                } else if(direction == JoyStickClass.STICK_NONE) {
                    textView10.setText("Direction : Center");
                }
            } else if(arg1.getAction() == MotionEvent.ACTION_UP) {
                textView6.setText("X :");
                textView7.setText("Y :");
                textView8.setText("Angle :");
                textView9.setText("Distance :");
                textView10.setText("Direction :");
            }
            tabPagerAdapter.notifyDataSetChanged();

            return true;
        }
    });

    ImageView imgr2d2 = (ImageView) findViewById(R.id.r2d2);
    imgr2d2.setOnClickListener(new View.OnClickListener() 
    {
        @Override
        public void onClick(View v) 
        {
            try 
            {
                MediaPlayer mediaPlayer = MediaPlayer.create(getApplicationContext(), R.raw.r2d2);
                mediaPlayer.start();
            } catch (IllegalStateException e) 
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    });
    debug=true;
    final ImageView imgDebug = (ImageView) findViewById(R.id.debug);
    imgDebug.setOnClickListener(new View.OnClickListener() 
    {
        @Override
        public void onClick(View v) 
        {
            if (debug==true)
            {
                imgDebug.setImageResource(R.drawable.toggle_off);
                debug=false;
                textView1.setVisibility(View.GONE);
                textView2.setVisibility(View.GONE);
                textView3.setVisibility(View.GONE);
                textView4.setVisibility(View.GONE);
                textView5.setVisibility(View.GONE);
                textView6.setVisibility(View.GONE);
                textView7.setVisibility(View.GONE);
                textView8.setVisibility(View.GONE);
                textView9.setVisibility(View.GONE);
                textView10.setVisibility(View.GONE);
            }
            else
            {
                imgDebug.setImageResource(R.drawable.toggle_on);
                textView1.setVisibility(View.VISIBLE);
                textView2.setVisibility(View.VISIBLE);
                textView3.setVisibility(View.VISIBLE);
                textView4.setVisibility(View.VISIBLE);
                textView5.setVisibility(View.VISIBLE);
                textView6.setVisibility(View.VISIBLE);
                textView7.setVisibility(View.VISIBLE);
                textView8.setVisibility(View.VISIBLE);
                textView9.setVisibility(View.VISIBLE);
                textView10.setVisibility(View.VISIBLE);
                debug=true;
            }

            tabPagerAdapter.notifyDataSetChanged();



        }

    });
}
        debug=true;
        final ImageView imgDebug = (ImageView) findViewById(R.id.debug);
        imgDebug.setOnClickListener(new View.OnClickListener() 
        {
            @Override
            public void onClick(View v) 
            {
                if (debug==true)
                {
                    imgDebug.setImageResource(R.drawable.toggle_off);
                    debug=false;
                    textView1.setVisibility(View.GONE);
                    textView2.setVisibility(View.GONE);
                    textView3.setVisibility(View.GONE);
                    textView4.setVisibility(View.GONE);
                    textView5.setVisibility(View.GONE);
                    textView6.setVisibility(View.GONE);
                    textView7.setVisibility(View.GONE);
                    textView8.setVisibility(View.GONE);
                    textView9.setVisibility(View.GONE);
                    textView10.setVisibility(View.GONE);
                }
                else
                {
                    imgDebug.setImageResource(R.drawable.toggle_on);
                    textView1.setVisibility(View.VISIBLE);
                    textView2.setVisibility(View.VISIBLE);
                    textView3.setVisibility(View.VISIBLE);
                    textView4.setVisibility(View.VISIBLE);
                    textView5.setVisibility(View.VISIBLE);
                    textView6.setVisibility(View.VISIBLE);
                    textView7.setVisibility(View.VISIBLE);
                    textView8.setVisibility(View.VISIBLE);
                    textView9.setVisibility(View.VISIBLE);
                    textView10.setVisibility(View.VISIBLE);
                    debug=true;
                }

                tabPagerAdapter.notifyDataSetChanged();


            }

        });
    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }   
}

TabPagerAdapter.java

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

public class TabPagerAdapter extends FragmentPagerAdapter 
{
private final List<Fragment> fragmentList;

public TabPagerAdapter(FragmentManager fm) 
{
    super(fm);
    fragmentList = new ArrayList<Fragment>();
    fragmentList.add(new FirstTab());
    fragmentList.add(new SecondTab());
    fragmentList.add(new ThirdTab());
}


 @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

 @Override
    public int getItemPosition(Object object) {
        return POSITION_UNCHANGED;
    }

    @Override
    public int getCount() 
    {
        return fragmentList.size();
    }
}

FirstTab.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FirstTab extends Fragment 
{
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) 
    {

        View v = inflater.inflate(R.layout.first_tab, container, false);
        return v;
    }
}

main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:background="@color/black"
    android:layout_height="match_parent" >

    <android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:background="#00cd00" >

    </android.support.v4.view.ViewPager>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="5dp"
        android:layout_centerInParent="true"
        android:background="@color/black"
        android:orientation="vertical" >

        <TextView 
            android:id="@+id/debugLabel"
            android:layout_width="70dp"
            android:layout_height="wrap_content"
            android:text="Debug"
            android:textColor="#444444"
            android:textSize="15dp"
            android:layout_centerHorizontal="true"
            />
        <ImageView
            android:id="@+id/debug"
            android:layout_width="70dp"
            android:layout_height="50dp"
            android:src="@drawable/toggle_on"
            />

    </LinearLayout>

    <RelativeLayout
        android:id="@+id/layout_joystick"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="5dp"
        android:background="@drawable/image_button_bg" >
    </RelativeLayout>
    <ImageView
        android:id="@+id/r2d2"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:src="@drawable/r2d2"
        android:layout_marginBottom="0dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        />

    <RelativeLayout
        android:id="@+id/layout_joystick2"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:layout_marginRight="5dp"
        android:background="@drawable/left_right_joy" >
    </RelativeLayout>
</RelativeLayout>

first_tab.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/DebugRelativeLayout"
    android:layout_width="match_parent"
    android:background="@color/black"
    android:layout_height="match_parent" >
<LinearLayout
    android:id="@+id/TextviewLayout1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:background="@color/black"
    android:orientation="vertical" >
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="X"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Y"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Angle"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Distance"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Direction"
        android:textColor="#444444"
        android:textSize="20dp" />
</LinearLayout>
<LinearLayout
    android:id="@+id/TextviewLayout2"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_marginRight="50dp"
    android:layout_alignParentTop="true"
    android:background="@color/black"
    android:orientation="vertical" >
    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="X"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Y"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Angle"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Distance"
        android:textColor="#444444"
        android:textSize="20dp" />
    <TextView
        android:id="@+id/textView10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Direction"
        android:textColor="#444444"
        android:textSize="20dp" />
    </LinearLayout>
</RelativeLayout>

Answer 1

我在这里看到三个问题：

修改TextView后，您永远不会调用tabPagerAdapter.notifyDataSetChanged()，这会导致适配器刷新。
在适配器的getItem()方法中，每次调用方法时都会重新创建片段。娱乐意味着碎片以其原始状态出现。通常，您希望避免在ListView中进行娱乐。因此，要么将带有片段的列表传递给适配器，要么在其构造函数中创建此列表。
如果我没有记错，则invalidate()上的ViewGroup没有必要。

您应该使用适配器。也许这个基本实现会对你有帮助。

public class TabPagerAdapter extends FragmentStatePagerAdapter {
    private final List<Fragment> fragmentList;

    public FragmentsPagerAdapter(FragmentManager fragmentManager) {
    super(fragmentManager);
    fragmentList = new ArrayList<>();
    fragmentList.add(new FirstTab());
    fragmentList.add(new SecondTab());
    fragmentList.add(new ThirdTab());
    }

    @Override
    public int getCount() {
        return fragmentList.size();
    }

    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getItemPosition(Object object) {
        return POSITION_UNCHANGED;
    }
}

在另一个视图上更改TextView

1 个答案: