Question

我正在Android工作室创建一个应用程序来跟踪我观看过的电视节目。但是，当我尝试启动EditShowActivity时，通过单击listview中的项目，我的手机应用程序崩溃了。我无法弄清楚为什么或如何。

调用我的EditShowActivity

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Intent intent = new Intent(MainActivity.this, EditShowActivity.class);
                intent.putExtra(EXTRA_SHOW_ID, showArrayAdapter.getItem(position).getId());
                startActivityForResult(intent, 2);            }
        });

这是我的EditShowActivity

public class EditShowActivity extends AppCompatActivity {
    private Show show;
    private DataSource datasource;
    private EditText editText;

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

        datasource = new DataSource(this);
        long showId = getIntent().getLongExtra(MainActivity.EXTRA_SHOW_ID, -1);
        show = datasource.getShow(showId);

        TextView textView = (TextView) findViewById(R.id.details_textview);
        textView.setText(show.getShow());

        editText = (EditText) findViewById(R.id.details_updateText);

        Button updateButton = (Button) findViewById(R.id.details_updateButton);

        updateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                show.setShows(editText.getText().toString());
                datasource.updateShow(show);
                Toast.makeText(EditShowActivity.this, "Assignment Updated", Toast.LENGTH_SHORT).show();

                Intent resultIntent = new Intent();
                setResult(Activity.RESULT_OK, resultIntent);
                finish();
            }

        });
    }
}

我的activity_edit.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:fab="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.example.kevin.androidapp.EditShowActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"

            app:popupTheme="@style/AppTheme.PopupOverlay" />



    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_edit" />



</FrameLayout>

我的content_edit.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/activity_edit">

    <TextView
        android:id="@+id/details_textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="44dp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginBottom="10dp">

        <EditText
            android:id="@+id/details_updateText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <Button
            android:id="@+id/details_updateButton"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:onClick="addListItem"
            android:text="Update" />

    </LinearLayout>



</RelativeLayout>

Answer 1

你可以尝试：

intent.putExtra(MainActivity.EXTRA_SHOW_ID, (long) showArrayAdapter.getItem(position).getId());

然后：

long showId = (long) getIntent().getLongExtra(MainActivity.EXTRA_SHOW_ID, -1);

无法加载editActivity页面

1 个答案: