Android 无法更改包含带片段的Viewpager的活动

我想从没有viewpager、tablayout或fragment的正常活动更改为包含tablayout、fragments和viewpager的活动

每次我执行：

Intent intent = new Intent(this, SecondActivity.class);
this.startActivity(intent);
finish();

我的应用程序停止，无法加载

更新：

第二个活动代码：

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.graphics.Typeface;
import android.net.Uri;
import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import android.widget.VideoView;

import uk.co.chrisjenx.calligraphy.CalligraphyConfig;
import uk.co.chrisjenx.calligraphy.CalligraphyContextWrapper;

public class SecondActivity extends AppCompatActivity {

    private TabLayout tabToolbar;
    private ViewPager viewPager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
                .setDefaultFontPath("fonts/century.ttf")
                .setFontAttrId(R.attr.fontPath)
                .build()
        );


        SectionsPagerAdapter mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        viewPager = (ViewPager) findViewById(R.id.container);
        viewPager.setAdapter(mSectionsPagerAdapter);

        tabToolbar = (TabLayout) findViewById(R.id.tabToolbar);
        tabToolbar.setupWithViewPager(viewPager);

        tabToolbar.getTabAt(0).setIcon(R.mipmap.home_button);
        tabToolbar.getTabAt(1).setIcon(R.mipmap.pay_button);
        tabToolbar.getTabAt(2).setIcon(R.mipmap.video_button);
        tabToolbar.getTabAt(3).setIcon(R.mipmap.bill_button);

        tabToolbar.getTabAt(tabToolbar.getSelectedTabPosition()).getIcon().setColorFilter(Color.parseColor("#FFFFFF"), PorterDuff.Mode.SRC_IN);

        tabToolbar.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {

                tabToolbar.getTabAt(tabToolbar.getSelectedTabPosition()).getIcon().setColorFilter(Color.parseColor("#FFFFFF"), PorterDuff.Mode.SRC_IN);
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                tabToolbar.getTabAt(tabToolbar.getSelectedTabPosition()).getIcon().setColorFilter(Color.parseColor("#e40079"), PorterDuff.Mode.SRC_IN);
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });
    }


    @Override
    protected void attachBaseContext(Context newBase) {
        super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
    }
}

如何启动包含带有片段的viewpager的活动

更新：LogCat:

09-09 14:59:11.002 2650-2650/com.example.fdai3744.t_online20 E/AndroidRuntime: FATAL EXCEPTION: main
                                                                               Process: com.example.fdai3744.t_online20, PID: 2650
                                                                               java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fdai3744.t_online20/com.example.fdai3744.t_online20.SecondActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference
                                                                                   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
                                                                                   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
                                                                                   at android.app.ActivityThread.-wrap12(ActivityThread.java)
                                                                                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
                                                                                   at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                   at android.os.Looper.loop(Looper.java:154)
                                                                                   at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                                                   at java.lang.reflect.Method.invoke(Native Method)
                                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
                                                                                Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference
                                                                                   at com.example.fdai3744.t_online20.SecondActivity.onCreate(SecondActivity.java:41)
                                                                                   at android.app.Activity.performCreate(Activity.java:6679)
                                                                                   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
                                                                                   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
                                                                                   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
                                                                                   at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                                                                                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
                                                                                   at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                   at android.os.Looper.loop(Looper.java:154) 
                                                                                   at android.app.ActivityThread.main(ActivityThread.java:6119) 
                                                                                   at java.lang.reflect.Method.invoke(Native Method) 
                                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

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检查布局XML是否具有ViewPager。或者确保您的id指向ViewPager

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希望有帮助：）

感谢cricket_007发现错误。 在我的SetContentView方法中，是“R.layout.activity\u main”，而不是“R.layout.activity\u second”

---

您可以启动包含片段的活动的意图，而不会出现任何问题。

发布您的第二个活动代码，我就是这么做的。请参阅下面我的问题。如果你的应用程序停止，请将logcat添加到问题OOPS这是一项活动。我以为是碎片。从MobilePosting为什么在第二个活动中尝试使用

setContentView（R.layout.activity\u main）

？我假设layout没有ViewPagerThat不是活动类的方法