java - OnEditorActionListener() 工作但无法从 EditText 获取文本

Question

我想从编辑文本中获取用户名并将其显示在 TextView id-textView2 中的第二个 Activity 中。当我在输入名称后按回车键并单击开始按钮时，它会转到第二个 Activity ，但不会显示文本。我尝试在 onEditorAction 方法中执行其他操作，如 startActivity() 在我按下回车后它起作用了，但这段代码不起作用

String name = nameText.getText().toString();
Intent p1 = new Intent(MainActivity.this, qPage1.class);
p1.putExtra("user_name",name);

是因为我在 Activity A 的 onEditorAction() 内部和 starQuizz 方法内部声明了两次 Intent 。我这样做是因为范围问题。

Activity A

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.content.Intent;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;
import android.view.KeyEvent;
import android.widget.TextView.OnEditorActionListener;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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



        final EditText nameText = findViewById(R.id.nameText);
        nameText.setOnEditorActionListener(new OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView nameText, int actionId, KeyEvent event) {
                boolean handled = false;
                if (actionId == EditorInfo.IME_ACTION_SEND || event.getKeyCode() == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN) {
                    String name = nameText.getText().toString();
                    Intent p1 = new Intent(MainActivity.this, qPage1.class);
                    p1.putExtra("user_name",name);
                    handled = true;
                }
                return handled;
            }
        });



    }

    //OnClick of a Start button
    public void startQuizz(View view){
        Intent p1 = new Intent(this, qPage1.class);
        startActivity(p1);
    }
}

Activity 一个 xml 布局

<?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:background="@drawable/beautifulcolorgradientsbackgrounds091eternalconstance"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/nameText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="181dp"
        android:width="300dp"
        android:hint="@string/name_input"
        android:inputType="text"
        android:imeOptions="actionSend"
        android:imeActionId="10"/>

    <Button
        android:id="@+id/start_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="182dp"
        android:onClick="startQuizz"
        android:text="START" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="45dp"
        android:fontFamily="@font/changa_one"
        android:text="Are you up for the challenge?"
        android:textAlignment="center"
        android:textAllCaps="false"
        android:textSize="30sp" />

</RelativeLayout>

Activity 2

package com.guesstasif.guesswhat;

import android.content.Intent;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import  android.view.View;
import android.widget.TextView;

public class qPage1 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_q_page1);

        final ProgressBar p1progress = findViewById(R.id.pg1progressBar);

        Runnable r = new Runnable() {
            @Override
            public void run() {
                int progressStatus = 0;
                while (progressStatus<200){
                    p1progress.incrementProgressBy(1);
                    android.os.SystemClock.sleep(50);
                    progressStatus++;
                }

                RadioButton q1radiobutton3 = findViewById(R.id.q1radioButton3);
                RadioButton q2radiobutton1 = findViewById(R.id.q2radioButton1);



                Intent p2 = new Intent(qPage1.this, qPage2.class);
                //name==============================================================

                String name = getIntent().getStringExtra("user_name");
                TextView textView2= findViewById(R.id.textView2);
                textView2.setText(name);

                //==================================================================

                if(q1radiobutton3.isChecked() && q2radiobutton1.isChecked())
                {
                    p2.putExtra("intVariableName", 2);
                }
                else if (q1radiobutton3.isChecked() || q2radiobutton1.isChecked())
                {
                    p2.putExtra("intVariableName", 1);

                }
                startActivity(p2);
            }
        };
        Thread progressThread =new Thread(r);
        progressThread.start();
    }
}

Activity 2 xml 布局

<?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"
    tools:context=".qPage1">

    <TextView
        android:id="@+id/q1textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:text="Q1.What is the name of the 7th planet of ou Solar system?"
        android:textAlignment="center"
        android:textSize="24sp" />

    <RadioGroup
        android:id="@+id/q1radioGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/q1textView"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/q1radioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Jupiter" />

        <RadioButton
            android:id="@+id/q1radioButton2"
            android:layout_width="84dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Saturn" />

        <RadioButton
            android:id="@+id/q1radioButton3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Uranus" />

        <RadioButton
            android:id="@+id/q1radioButton4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Neptune" />
    </RadioGroup>

    //second Question//

    <TextView
        android:id="@+id/q2textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="173dp"
        android:text="Q2.What is the name of the largest tree in the world?"
        android:textAlignment="center"
        android:textSize="24sp" />

    <RadioGroup
        android:id="@+id/q2radioGroup"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/q2textView">

        <RadioButton
            android:id="@+id/q2radioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="General Sherman" />

        <RadioButton
            android:id="@+id/q2radioButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Sequoia sempervirens" />

        <RadioButton
            android:id="@+id/q2radioButton3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Centurion" />

        <RadioButton
            android:id="@+id/q2radioButton4"
            android:layout_width="wrap_content"
            android:layout_height="35dp"
            android:layout_weight="1"
            android:text="Coast redwood" />

    </RadioGroup>

    <ProgressBar
        android:id="@+id/pg1progressBar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="33dp"
        android:max="200" />

    <TextView
        android:id="@+id/scoreView"
        android:layout_width="170dp"
        android:layout_height="41dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="89dp" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="137dp"
        android:textAlignment="center" />
</RelativeLayout>

Answer 1

原因是您在此处开始一个新的Intent:

public void startQuizz(View view){
        Intent p1 = new Intent(this, qPage1.class);
        startActivity(p1);
    }

它不传递字符串，只是启动一个新的 Intent-Activity。

也在这里:

Intent p1 = new Intent(MainActivity.this, qPage1.class);
                    p1.putExtra("user_name",name);

你错过了启动 Intent 所以:

Intent p1 = new Intent(MainActivity.this, qPage1.class);
                        p1.putExtra("user_name",name);
                        startActivity(p1);

然后在测验方法中，启动另一个Intent:

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

---

最后，在第二个 Activity 中:

Bundle bundle = getIntent().getExtras();
String name = bundle.getString("user_name");

此外，您使用的是 Thread 而不是 runOnUIThread();，这可能会导致一些 UI 效果。