摘要页面和传递意图

Question

我有一种形式，用户必须在其中写入一些信息并发送到 mysql 数据库。我现在尝试的是制作新的 activity ，在用户提交表单后加载并显示他刚刚提交的内容 - 摘要页面。在这个 Activity 中，我从之前的 activity 中获取所有信息，并且用户将数据发送到数据库。然后我尝试将信息传递给 Summary.class

    btnFinish = (Button) findViewById(R.id.btnFinish);

    btnFinish.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            Bundle extras = getIntent().getExtras();
            if (extras != null) {
                Name = getIntent().getExtras().getString("Name");
                Email = getIntent().getExtras().getString("Email");
        }

            new SummaryAsyncTask().execute((Void) null);
            Intent newActivity = new Intent(TableInformation.this, Summary.class);

            newActivity.putExtra("Name", Name);
            newActivity.putExtra("Email", Email);
            Log.d("Information to summary", Name + " " + Email);
            startActivity(new Intent(Information.this, Summary.class));
        }

这就是我目前在 Summary.class

String getName;
String getEmail;

TextView nameOfPerson, emailOfPerson;

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

    Bundle extras = getIntent().getExtras();
    if (extras != null) {
        getName = getIntent().getExtras().getString("Name");
        getEmail = getIntent().getExtras().getString("Email");
    }   
    ((TextView)findViewById(R.id.nameOfPerson)).setText(getName+"");
    ((TextView)findViewById(R.id.emailOfPerson)).setText(getEmail+"");
}

并且 summary.xml 包含

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/nameOfPerson"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:layout_marginTop="75dp"
    android:text=""
    android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
    android:id="@+id/emailOfPerson"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:layout_marginLeft="10dp"
    android:text=""
    android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>

现在 textview 的结果都是 NULL。有人可以帮忙吗？

Answer 1

您在启动 activity 时正在创建新意图。好像出错了。

而不是

Intent newActivity = new Intent(TableInformation.this, Summary.class);
        newActivity.putExtra("Name", Name);
        newActivity.putExtra("Email", Email);
        Log.d("Information to summary", Name + " " + Email);
        startActivity(new Intent(Information.this, Summary.class));

这样做

Intent newActivity = new Intent(TableInformation.this, Summary.class);
        newActivity.putExtra("Name", Name);
        newActivity.putExtra("Email", Email);
        Log.d("Information to summary", Name + " " + Email);
        startActivity(newActivity);

如果您有任何疑问，请发表评论。

Answer 2

问题是您没有在调用开始 activity 之前首先 activity 将 bundle 设置为 activity
顺便初始化包变量 Bundle extrabundle = new Bundle();

摘要页面和传递意图

Summary page and passing intents

android

android-intent