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法学如何在Android中不使用Intent的情况下将数据从一个Activity发送到另一个Activity？
此示例演示如何在不使用Intent的情况下将数据从一个Activity发送到另一个Activity。
步骤1 - 在Android Studio中创建一个新项目，转到文件 ⇒ 新建项目，并填写所有必需的详细信息以创建一个新项目。
步骤2 - 将以下代码添加到res/layout/activity_main.xml。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:layout_margin = "16dp" android:orientation = "vertical" tools:context = ".MainActivity"> <EditText android:id = "@+id/edit_text" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center" android:hint = "Enter something to pass" android:inputType = "text" /> <Button android:id = "@+id/button" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_gravity = "center" android:layout_marginTop = "16dp" android:text = "Next" /> </LinearLayout>
步骤3 - 将以下代码添加到src/MainActivity.java
package com.example.myapplication;
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;
public class MainActivity extends AppCompatActivity {
private static String value;
public static String getValue() {
return value;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText editText = findViewById(R.id.edit_text);
Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
value = editText.getText().toString().trim();
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent);
}
});
}
}步骤4 - 将以下代码添加到res/layout/activity_second.xml。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:layout_margin = "16dp" android:orientation = "vertical" tools:context = ".SecondActivity"> <TextView android:id = "@+id/text_view" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center" /> </LinearLayout>
步骤5 - 将以下代码添加到src/SecondActivity.java
package com.example.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class SecondActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
TextView textView = findViewById(R.id.text_view);
textView.setText(MainActivity.getValue());
}
}步骤6 - 将以下代码添加到androidManifest.xml
<?xml version = "1.0" encoding = "utf-8"?> <manifest xmlns:android = "http://schemas.android.com/apk/res/android" package = "com.example.myapplication"> <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 = ".SecondActivity"></activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要在Android Studio中运行应用程序，请打开您的项目中的一个Activity文件，然后单击运行 
工具栏中的图标。选择您的移动设备作为选项，然后检查您的移动设备，它将显示您的默认屏幕 -
使用SharedPreferences
此示例演示如何使用sharedPreferences将数据从一个Activity发送到另一个Activity。
步骤1 - 在Android Studio中创建一个新项目，转到文件 ⇒ 新建项目，并填写所有必需的详细信息以创建一个新项目。
步骤2 - 将以下代码添加到res/layout/activity_main.xml。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:layout_margin = "16dp" android:orientation = "vertical" tools:context = ".MainActivity"> <EditText android:id = "@+id/edit_text" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center" android:hint = "Enter something to pass" android:inputType = "text" /> <Button android:id = "@+id/button" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_gravity = "center" android:layout_marginTop = "16dp" android:text = "Next" /> </LinearLayout>
步骤3 - 将以下代码添加到src/MainActivity.java
package com.example.myapplication;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText editText = findViewById(R.id.edit_text);
Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String value = editText.getText().toString().trim();
SharedPreferences sharedPref = getSharedPreferences("myKey", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString("value", value);
editor.apply();
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent);
}
});
}
}步骤4 - 将以下代码添加到res/layout/activity_second.xml。
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" xmlns:tools = "http://schemas.android.com/tools" android:layout_width = "match_parent" android:layout_height = "match_parent" android:layout_margin = "16dp" android:orientation = "vertical" tools:context = ".SecondActivity"> <TextView android:id = "@+id/text_view" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center" /> </LinearLayout>
步骤5 - 将以下代码添加到src/SecondActivity.java
package com.example.myapplication;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class SecondActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
TextView textView = findViewById(R.id.text_view);
SharedPreferences sharedPreferences = getSharedPreferences("myKey", MODE_PRIVATE);
String value = sharedPreferences.getString("value","");
textView.setText(value);
}
}步骤6 - 将以下代码添加到androidManifest.xml
<?xml version = "1.0" encoding = "utf-8"?> <manifest xmlns:android = "http://schemas.android.com/apk/res/android" package = "com.example.myapplication"> <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 = ".SecondActivity"></activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要在Android Studio中运行应用程序，请打开您的项目中的一个Activity文件，然后单击运行 工具栏中的图标。选择您的移动设备作为选项，然后检查您的移动设备，它将显示您的默认屏幕 -
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更新于：2019年7月30日
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