Question

我需要启动一个活动，其中包含一些数据的详细信息，这些数据传递了我在我的Intent上从Firebase数据库获取的参数，但每次我点击适配器上的项目时，我的应用程序都会崩溃。

我有这样的活动：

需要打开这样的东西：

这是我的Adapter.setOnClickListener代码：

viewHolder.eventCardView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent eventIntent = new Intent(getContext(), EventActivity.class);
                    eventIntent.putExtra("event_id", event.getName());
                    startActivity(eventIntent);
                }
            });

这是我的新活动代码来获取该参数：

package br.com.ministeriosonhodedeus.sonhodedeus.activity;

import android.content.Intent;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.v4.app.ActivityCompat;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.ImageView;

import com.squareup.picasso.Picasso;

import br.com.ministeriosonhodedeus.sonhodedeus.R;
import br.com.ministeriosonhodedeus.sonhodedeus.domain.Event;
import br.com.ministeriosonhodedeus.sonhodedeus.fragments.EventFragment;

public class EventActivity extends BaseActivity {

private Event e;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_event);

    setUpToolbar();
    e = getIntent().getParcelableExtra("event_id");
    getSupportActionBar().setTitle(e.getName());
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    ImageView appBarImg = (ImageView) findViewById(R.id.appBarImg);
    Picasso.with(getContext()).load(e.geturl_foto()).into(appBarImg);
    if (savedInstanceState == null) {
        EventFragment frag = new EventFragment();
        frag.setArguments(getIntent().getExtras());
        getSupportFragmentManager().beginTransaction().add(R.id.EventFragment, frag).commit();
    }
}

public void setTitle(String s) {
    CollapsingToolbarLayout c = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
    c.setTitle(s);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            ActivityCompat.finishAfterTransition(getActivity());
            return true;
    }
    return super.onOptionsItemSelected(item);
}
}

这是我的错误logcat：

03-21 14:18:12.390 27190-27190/br.com.ministeriosonhodedeus.sonhodedeus E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                      Process: br.com.ministeriosonhodedeus.sonhodedeus, PID: 27190
                                                                                      java.lang.RuntimeException: Unable to start activity ComponentInfo{br.com.ministeriosonhodedeus.sonhodedeus/br.com.ministeriosonhodedeus.sonhodedeus.activity.EventActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String br.com.ministeriosonhodedeus.sonhodedeus.domain.Event.getName()' on a null object reference
                                                                                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
                                                                                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
                                                                                          at android.app.ActivityThread.-wrap12(ActivityThread.java)
                                                                                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
                                                                                          at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                          at android.os.Looper.loop(Looper.java:154)
                                                                                          at android.app.ActivityThread.main(ActivityThread.java:6123)
                                                                                          at java.lang.reflect.Method.invoke(Native Method)
                                                                                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
                                                                                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
                                                                                       Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String br.com.ministeriosonhodedeus.sonhodedeus.domain.Event.getName()' on a null object reference
                                                                                          at br.com.ministeriosonhodedeus.sonhodedeus.activity.EventActivity.onCreate(EventActivity.java:30)
                                                                                          at android.app.Activity.performCreate(Activity.java:6672)
                                                                                          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
                                                                                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
                                                                                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724) 
                                                                                          at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                                                                                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473) 
                                                                                          at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                          at android.os.Looper.loop(Looper.java:154) 
                                                                                          at android.app.ActivityThread.main(ActivityThread.java:6123) 
                                                                                          at java.lang.reflect.Method.invoke(Native Method) 
                                                                                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867) 
                                                                                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)

知道出了什么问题？谢谢！

Answer 1

要解决此问题，请更改以下代码行：

e = getIntent().getParcelableExtra("event_id");

与

String event_id = (String) getIntent().getExtras().get("event_id");

和此：

getSupportActionBar().setTitle(e.getName());

与

getSupportActionBar().setTitle(event_id);

使用FirebaseRecyclerAdapter中的参数启动Activity

1 个答案: