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1、在Activity之间传递数据还可以利用一些技巧,无论是Windows还是Linux操作系统,都支持一种叫做剪切板的技术(某一程序将数据复制到剪切板上,其它的任何程序都可以从剪切板中获取数据); 2、新建一个名为“android_intent3”的Android工程; 3、在main.xml文件中添加Button: ~~~ <Button android:id="@+id/button" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Android使用剪切板传递数据" /> ~~~ 4、新建布局文件”other.xml“,添加”TextView“,代码: ~~~ <?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" > <TextVeiw android:id="@+id/msg" android:layout_width="fill_parent" android:layout_height="fill_parent" > </TextVeiw> </LinearLayout> ~~~ 5、声明一个Activity,”OtherActivity“,并继承Activity,在此类中创建”onCreate“方法; 6、回到“Main.java”中,添加成员Button,并向Android系统调用剪切板,构造意图并启动,代码: ~~~ package com.android.myintent; import android.os.Bundle; import android.app.Activity; import android.content.ClipboardManager; import android.content.Context; import android.content.Intent; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.TextView; public class Main extends Activity { private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) this.findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub // 从Android系统中调用剪切板的服务 ClipboardManager clipboardManager = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE); String name = "Jack"; clipboardManager.setText(name);// 向剪切板添加数据 Intent intent = new Intent(Main.this, OtherActivity.class); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } ~~~ 9、点击“OtherActivity.java”,添加获取剪切板方法,获取剪切板数据,设置到“textView”上,代码: ~~~ package com.android.myintent; import android.app.Activity; import android.content.ClipboardManager; import android.content.Context; import android.os.Bundle; import android.widget.TextView; public class OtherActivity extends Activity { private TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.other); textView = (TextView) this.findViewById(R.id.msg); ClipboardManager clipboardManager = (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE); String msgString = clipboardManager.getText().toString();//从剪切板中获取数据 textView.setText(msgString); } public OtherActivity() { // TODO Auto-generated constructor stub } } ~~~ 10、在“AndroidManifest.xml”上添加“Activity”: ~~~ <activity android:name=".OtherActivity" > </activity> ~~~ 11、运行: ![](https://box.kancloud.cn/2016-08-23_57bc06b1615e0.jpg) ![](https://box.kancloud.cn/2016-08-23_57bc06b183294.jpg) 12、点击按钮,居然提示无法运行,后来经过查找,发现是因为在Android11版本之后,原来利用剪切板传递数据使用的setText()和getText()方法被弃用了,只能使用ClipData对象来代替了~下面我们来对上面的程序做出一点改动即可~ 第8步中橙色部分的程序替换为: ~~~ ClipData clipData = ClipData.newPlainText("Label", "Jack"); clipboardManager.setPrimaryClip(clipData); ~~~ 第9步中橙色部分的程序替换为: ~~~ ClipData clipData = clipboardManager.getPrimaryClip();//从剪切板中获取数据 Item item = clipData.getItemAt(0); textView.setText(item.getText().toString()); ~~~ 13、如果我们想在剪切板中传递复杂数据,比如一个对象:先建一个类“MyData”,并使其实现“serializable”接口(在Superclass选项里): 14、在新建类中添加成员“name”、“age”并提供构造方法,代码如下: ~~~ import java.io.Serializable; public class MyData implements Serializable { private String name; private int age; @Override public String toString() { return "MyData [name=" + name + ", age=" + age + "]"; } public MyData(String name, int age) { super(); this.name = name; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } } ~~~ 15、进入“Main.java”,将原来添加的代码注释掉,然后实例化一个MyData对象,代码如下(用到了Base64工具类): ~~~ package com.android.myintent; import java.io.ByteArrayOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import android.os.Bundle; import android.app.Activity; import android.content.ClipData; import android.content.ClipData.Item; import android.content.ClipboardManager; import android.content.Context; import android.content.Intent; import android.util.Base64; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.TextView; public class Main extends Activity { private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = (Button) this.findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub // 从Android系统中调用剪切板的服务 // ClipboardManager clipboardManager = (ClipboardManager) // getSystemService(Context.CLIPBOARD_SERVICE); // 向剪切板添加数据 // ClipData clipData = ClipData.newPlainText("label", "Jack"); // clipboardManager.setPrimaryClip(clipData); // Intent intent = new Intent(Main.this, OtherActivity.class); // startActivity(intent); MyData myData = new MyData("Jack", 23); // 将对象转换为字符串 ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); String base64String = ""; try {// 捕获异常 ObjectOutputStream objectOutputStream = new ObjectOutputStream( byteArrayOutputStream); objectOutputStream.writeObject(myData); base64String = Base64.encodeToString( byteArrayOutputStream.toByteArray(), Base64.DEFAULT); objectOutputStream.close(); } catch (Exception e) { // TODO: handle exception } ClipboardManager clipboardManager = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE); ClipData clipData = ClipData .newPlainText("label", base64String); clipboardManager.setPrimaryClip(clipData); Intent intent = new Intent(Main.this, OtherActivity.class); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } ~~~ 16、进入“OtherActivity.java”,修改代码如下: ~~~ package com.android.myintent; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import android.annotation.SuppressLint; import android.app.Activity; import android.content.ClipData; import android.content.ClipboardManager; import android.content.Context; import android.content.ClipData.Item; import android.os.Bundle; import android.util.Base64; import android.widget.TextView; public class OtherActivity extends Activity { private TextView textView; @SuppressLint("NewApi") @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.other); textView = (TextView) this.findViewById(R.id.msg); ClipboardManager clipboardManager = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE); ClipData clipData = clipboardManager.getPrimaryClip();// 从剪切板中获取数据 Item item = clipData.getItemAt(0); String msgString = item.getText().toString(); byte[] base64_byte = Base64.decode(msgString, Base64.DEFAULT); ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream( base64_byte); try { ObjectInputStream objectInputStream = new ObjectInputStream( byteArrayInputStream); MyData myData = (MyData) objectInputStream.readObject(); textView.setText(myData.toString()); } catch (Exception e) { // TODO: handle exception } } public OtherActivity() { // TODO Auto-generated constructor stub } } ~~~ Ps:未完待续~