Question

我的问题出在addTab（）方法中，但我不知道如何解决它。

这是错误日志：

10-12 02:19:43.750: E/AndroidRuntime(22899): FATAL EXCEPTION: main 
10-12 02:19:43.750: E/AndroidRuntime(22899): java.lang.RuntimeException: Unable to start activity ComponentInfo{yab.example.viewpager1/yab.example.viewpager1.MainActivity}: java.lang.IllegalStateException: Action Bar Tab must have a Callback
10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121) 10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.ActivityThread.access$700(ActivityThread.java:140) 10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
10-12 02:19:43.750: E/AndroidRuntime(22899): at android.os.Handler.dispatchMessage(Handler.java:99) 10-12 02:19:43.750: E/AndroidRuntime(22899): at android.os.Looper.loop(Looper.java:137)
10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.ActivityThread.main(ActivityThread.java:4944) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at java.lang.reflect.Method.invokeNative(Native Method) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at java.lang.reflect.Method.invoke(Method.java:511) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at dalvik.system.NativeStart.main(Native Method) 
10-12 02:19:43.750: E/AndroidRuntime(22899): Caused by: java.lang.IllegalStateException: Action Bar Tab must have a Callback 
10-12 02:19:43.750: E/AndroidRuntime(22899): at com.android.internal.app.ActionBarImpl.configureTab(ActionBarImpl.java:488) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at com.android.internal.app.ActionBarImpl.addTab(ActionBarImpl.java:514) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at com.android.internal.app.ActionBarImpl.addTab(ActionBarImpl.java:502) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at yab.example.viewpager1.MainActivity.onCreate(MainActivity.java:39) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.Activity.performCreate(Activity.java:5188) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 
10-12 02:19:43.750: E/AndroidRuntime(22899): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2085) 
10-12 02:19:43.750: E/AndroidRuntime(22899): ... 11 more

这是我的代码：

package com.example.viewpager3;

import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBar.Tab;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {
    private ViewPagerAdapter mSectionsPagerAdapter;
    private ViewPager mViewPager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        mSectionsPagerAdapter = new
                ViewPagerAdapter(getSupportFragmentManager());
        mViewPager = (ViewPager) findViewById(R.id.viewPager);
        mViewPager.setAdapter(mSectionsPagerAdapter);
        actionBar.addTab(actionBar.newTab().setText(R.string.hello_world));
//      for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
//          Toast.makeText(this, "hello "+i, Toast.LENGTH_SHORT).show();
//          //actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)));
//          }
//      mViewPager.setOnPageChangeListener(new
//              ViewPager.SimpleOnPageChangeListener() {
//              @Override
//              public void onPageSelected(int position) {
//                  Log.i("test de problème", "problème");
//              actionBar.setSelectedNavigationItem(position);
//              Log.i("test de problème", "no problème");
//              
//              }
//              });

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


    @Override
    public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
        // TODO Auto-generated method stub

    }


    @Override
    public void onTabSelected(Tab tab, FragmentTransaction arg1) {
        // TODO Auto-generated method stub
        mViewPager.setCurrentItem(tab.getPosition());
    }


    @Override
    public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {
        // TODO Auto-generated method stub

    }
}

Answer 1

您尚未设置侦听器。

使用此：

ActionBar.Tab tab = actionBar.newTab();
tab.setText(R.string.hello_world);
tab.setTabListener(this)
actionBar.addTab(tab);

操作栏选项卡必须具有Callback addTab错误

1 个答案: