[英]How can I make one button display the contents of two text boxes on the next screen?
我對編碼很陌生,這只是我在社區大學的第二個學期,因此我有很多東西要學。
在我的 Android 開發課程中,我的任務是使用我在此處的 Android 開發課程中創建的程序 - https://developer.android.com/training/basics/firstapp/starting-activity#java - 作為基礎對於一個新程序,它有 2 個文本框,並通過單擊 1 發送按鈕將用戶輸入到這些文本框中的內容顯示到顯示屏上。
我被困住了。
自從上周二發出挑戰以來,我一直在做這個,我一直在谷歌搜索,DuckDuckGo 搜索,通過 stackoverflow 搜索,在這里搜索 - https://developer.android.com/docs/ - 我已經嘗試了許多不同的方法,但我似乎無法找到如何實現這一點。
!!聲明:我不是要別人為我編寫程序/應用程序。 我只是想了解如何讓這個 1 按鈕將 2 個文本框內容發送到顯示器 - 我想學習!!
//* activity_main.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:id="@+id/ColorActivity"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/Name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:ems="10"
android:gravity="center"
android:layout_toRightOf="@+id/Number"
android:hint="edit_name_message"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:layout_below="@+id/Name"
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:layout_centerHorizontal="true"
android:text="button_send"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/Number" />
<EditText
android:id="@+id/Number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:ems="10"
android:gravity="center"
android:hint="edit_phone_message"
android:inputType="phone"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/Name" />
</RelativeLayout>
//* DisplayMessge.java */
package com.example.testapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
import com.example.testapp.R;
public class DisplayMessage extends Activity {
private TextView name;
private TextView number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display_activity);
name = findViewById(R.id.NameText);
number = findViewById(R.id.NumberText);
Intent getText = getIntent();
String TheName = getText.getStringExtra("Name");
String TheNumber = getText.getStringExtra("Number");
name.setText(TheName);
number.setText(TheNumber);
}
}
//* MainActivity.java */
package com.example.testapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.example.testapp.DisplayMessage;
import com.example.testapp.R;
public class MainActivity extends AppCompatActivity {
Button button;
private EditText name;
private EditText number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initialization of the EditText and the Button
name = (EditText) findViewById(R.id.Name);
number = (EditText) findViewById(R.id.Number);
button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), DisplayMessage.class);
String mName = name.getText().toString();
String mNumber = number.getText().toString();
//Checking if the Entries are empty
if (mName != null && mNumber != null) {
intent.putExtra("Name", mName);
intent.putExtra("Number", mNumber);
startActivity(intent);
finish();
} else {
Toast.makeText(getApplicationContext(), "Text Entries Missing", Toast.LENGTH_SHORT).show();
}
}
});
}
}
//* AndroidManifest.xml */
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.testapp">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".DisplayMessage">
<intent-filter>
<action android:name="android.intent.action.VIEW"></action>
</intent-filter>
</activity>
</application>
</manifest>
//* display_activity.xml */
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="match_parent">
<TextView
android:layout_gravity="center"
android:id="@+id/NameText"
android:layout_weight="1"
android:textSize="18sp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/NumberText"
android:layout_gravity="center"
android:textSize="18sp"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
您必須實現onClick函數並從那里發送意圖。
public class MainActivity extends AppCompatActivity {
Button button;
private EditText name;
private EditText number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initialization of the EditText and the Button
name = (EditText) findViewById(R.id.Name);
number = (EditText) findViewById(R.id.Number);
button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getApplicationContext(), DisplayMessage.class);
String mName = name.getText().toString();
String mNumber = number.getText().toString();
//Checking if the Entries are empty
if(mName!=null&&mNumber!=null) {
intent.putExtra("Name", mName);
intent.putExtra("Number", mNumber);
startActivity(intent);
finish();
}else{
Toast.makeText(getApplicationContext(),"Text Entries Missing",Toast.LENGTH_SHORT).show();
}
}
});
和顯示類別:
public class DisplayMessage extends Activity {
private TextView name;
private TextView number;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display_activity);
name = findViewById(R.id.NameText);
number = findViewById(R.id.NumberText);
Intent getText = getIntent();
String TheName =getText.getStringExtra("Name");
String TheNumber = getText.getStringExtra("Number");
name.setText(TheName);
number.setText(TheNumber);
}
同樣不要忘記將displayActivity添加到AndroidManifest.xml中
<activity android:name=".DisplayMessage">
<intent-filter>
<action android:name="android.intent.action.VIEW"></action>
</intent-filter>
</activity>
現在,您必須為DisplayMessageActivity創建第二個用戶界面,轉到res / layout,右鍵單擊布局文件夾,然后創建一個名為display_activity的新布局。 這是我的display_activity.xml代碼:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:orientation="horizontal"
android:layout_height="match_parent">
<TextView
android:layout_gravity="center"
android:id="@+id/NameText"
android:layout_weight="1"
android:textSize="18sp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/NumberText"
android:layout_gravity="center"
android:textSize="18sp"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
最后,這是activity_main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:id="@+id/ColorActivity"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/Name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:ems="10"
android:gravity="center"
android:layout_toRightOf="@+id/Number"
android:hint="edit_name_message"
android:inputType="textPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:layout_below="@+id/Name"
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:layout_centerHorizontal="true"
android:text="button_send"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/Number" />
<EditText
android:id="@+id/Number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:ems="10"
android:gravity="center"
android:hint="edit_phone_message"
android:inputType="phone"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/Name" />
</RelativeLayout>
您可以簡單地做到這一點,
public class MainActivity extends AppCompatActivity {
Button btn;
EditText number, name;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button);
number = (EditText) findViewById(R.id.Number);
name = (EditText) findViewById(R.id.Name);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String message = name.getText().toString();
String message2 = number.getText().toString();
Intent intent = new Intent(this, DisplayMessageActivity.class);
intent.putExtra("Message", message);
intent.putExtra("Message2", message2);
startActivity(intent);
}
});
}
}
並且您還必須在其中添加DisplayMessageActivity類,
String message1= getIntent().getStringExtra("Message");
String message2= getIntent().getStringExtra("Message2");
只需將兩個函數(snedNumber和sendName)減少為一個函數即可。 在此函數內,您將獲得兩個文本字段的文本,並將它們放入intentextra中。 然后只需開始您的新活動
像這樣做
public void sendInfo(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText name = (EditText) findViewById(R.id.Name);
String message = name.getText().toString();
EditText number = (EditText) findViewById(R.id.Number);
String message2 = number.getText().toString();
intent.putExtra("firstString", message);
intent.putExtra("secondString", message2);
startActivity(intent);
}
並在您的DisplayMessageActivity類的onCreate方法中將其獲取為
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_activity);
Bundle extra = getIntent().getExtras();
if (extra != null){
String message = extra.getString("firstString");
String message2 = extra.getString("secondString");
}
}
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