• Android : 页面之间的数据传递 intent+bundle

    Android : 页面之间的数据传递 intent+bundle

    ​

      一：Activity之间的传递——从当前页面直接传到跳转 的页面

    1：方法：利用Intent和Bundle实现

    2：目录：

         ​编辑

         一个activity对应一个xml对应一个界面；

    3：MainAcitivity.xml

    1. <?xml version="1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     tools:context=".MainActivity"
    8.     android:orientation="vertical">
    9.  
    10.    <EditText
    11.        android:layout_width="match_parent"
    12.        android:layout_height="wrap_content"
    13.        android:id="@+id/et1"
    14.        android:hint="数据填写行1"
    15.        />
    16.     <EditText
    17.         android:layout_width="match_parent"
    18.         android:layout_height="wrap_content"
    19.         android:id="@+id/et2"
    20.         android:hint="数据填写行2"
    21.         />
    22.     <Button
    23.         android:layout_width="wrap_content"
    24.         android:layout_height="wrap_content"
    25.         android:text="传递"
    26.         android:layout_gravity="center"
    27.         android:id="@+id/bt"/>
    28.  
    29. </LinearLayout>
    30.

    传递页

     js.xml

    1. <?xml version="1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     tools:context=".MainActivity"
    8.     android:orientation="vertical">
    9.  
    10.     <TextView
    11.         android:layout_width="wrap_content"
    12.         android:layout_height="wrap_content"
    13.         android:id="@+id/tv1"
    14.  
    15.         android:layout_gravity="center"
    16.         />
    17.  
    18.     <TextView
    19.         android:layout_width="wrap_content"
    20.         android:layout_height="wrap_content"
    21.         android:id="@+id/tv2"
    22.  
    23.         android:layout_gravity="center"
    24.         />
    25.  
    26. </LinearLayout>

    接收页

    4：java

    MainAcitivity.java

    1. package com.jyt.woc1;
    2.  
    3. import androidx.appcompat.app.AppCompatActivity;
    4.  
    5. import android.content.Intent;
    6. import android.os.Bundle;
    7. import android.view.View;
    8. import android.widget.Button;
    9. import android.widget.EditText;
    10.  
    11. public class MainActivity extends AppCompatActivity {
    12.     EditText et1,et2;
    13.     Button bt;
    14.     @Override
    15.     protected void onCreate(Bundle savedInstanceState) {
    16.         super.onCreate(savedInstanceState);
    17.         setContentView(R.layout.activity_main);
    18.  
    19.         et1=findViewById(R.id.et1);
    20.         et2=findViewById(R.id.et2);
    21.         bt=findViewById(R.id.bt);
    22.  
    23.         bt.setOnClickListener(new View.OnClickListener() {
    24.             @Override
    25.             public void onClick(View view) {
    26.                 String x,y;
    27.                 x=et1.getText().toString();
    28.                 y=et2.getText().toString();
    29.  
    30.                 Bundle bundle=new Bundle();//存各种数据
    31.                 bundle.putString("1:",x);
    32.                 bundle.putString("2:",y);
    33.  
    34.                 Intent woc =new Intent(MainActivity.this,js.class);
    35.                 woc.putExtras(bundle);
    36.                 startActivity(woc);
    37.  
    38.             }
    39.         });
    40.  
    41.     }
    42. }

    js.java

    1. package com.jyt.woc1;
    2.  
    3. import androidx.appcompat.app.AppCompatActivity;
    4.  
    5. import android.content.Intent;
    6. import android.os.Bundle;
    7. import android.widget.EditText;
    8. import android.widget.TextView;
    9.  
    10. public class js extends AppCompatActivity {
    11.     TextView tv1,tv2;
    12.     @Override
    13.     protected void onCreate(Bundle savedInstanceState) {
    14.         super.onCreate(savedInstanceState);
    15.         setContentView(R.layout.js);
    16.  
    17.         tv1=findViewById(R.id.tv1);
    18.         tv2=findViewById(R.id.tv2);
    19.  
    20.         Intent woc=getIntent();//获取
    21.         Bundle nb=woc.getExtras();//取出数据
    22.  
    23.         tv1.setText(nb.getString("1:"));//通过key取出
    24.         tv2.setText(nb.getString("2:"));
    25.  
    26.  
    27.  
    28.     }
    29. }

    二：Activity之间的传递——回调到上一页

    1:结构两个xml对应两个Acitivity 

    ​编辑

    2：xml文件

    activity_main.xml

    1. <?xml version="1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     xmlns:app="http://schemas.android.com/apk/res-auto"
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.     android:layout_width="match_parent"
    6.     android:layout_height="match_parent"
    7.     tools:context=".MainActivity"
    8.     android:orientation="vertical">
    9.  
    10.     <TextView
    11.         android:layout_width="wrap_content"
    12.         android:layout_height="wrap_content"
    13.         android:text="Who am i?"
    14.         android:layout_gravity="center"
    15.         android:textSize="50sp"
    16.         android:textColor="@color/black"
    17.  
    18.         />
    19.     <TextView
    20.         android:layout_width="wrap_content"
    21.         android:layout_height="wrap_content"
    22.         android:hint="你自己决定"
    23.         android:layout_gravity="center"
    24.         android:textSize="30sp"
    25.         android:id="@+id/et"/>
    26.     <Button
    27.         android:layout_width="wrap_content"
    28.         android:layout_height="wrap_content"
    29.         android:text="让我康康！"
    30.  
    31.         android:textSize="20sp"
    32.         android:layout_gravity="center"
    33.         android:id="@+id/bt"/>
    34.  
    35. </LinearLayout>

    xz.xml

    1. <?xml version="1.0" encoding="utf-8"?>
    2.  
    3. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    4.  
    5.     android:layout_width="match_parent"
    6.  
    7.     android:layout_height="match_parent"
    8.  
    9.     android:orientation="vertical">
    10.  
    11.     <RadioGroup
    12.  
    13.         android:layout_width="wrap_content"
    14.  
    15.         android:layout_height="wrap_content"
    16.  
    17.         android:layout_gravity="center"
    18.  
    19.         android:id="@+id/rg">
    20.  
    21.        <RadioButton
    22.  
    23.            android:layout_width="wrap_content"
    24.  
    25.            android:layout_height="wrap_content"
    26.  
    27.            android:text="我是阿伟！"
    28.  
    29.            android:textSize="20sp"
    30.  
    31.            android:id="@+id/rb1"
    32.  
    33.            />
    34.  
    35.  
    36.  
    37.         <RadioButton
    38.  
    39.             android:layout_width="wrap_content"
    40.  
    41.             android:layout_height="wrap_content"
    42.  
    43.             android:text="我是杰哥啊！"
    44.  
    45.             android:textSize="20sp"
    46.  
    47.             android:id="@+id/rb2"
    48.  
    49.             />
    50.  
    51.  
    52.  
    53.         <RadioButton
    54.  
    55.             android:layout_width="wrap_content"
    56.  
    57.             android:layout_height="wrap_content"
    58.  
    59.             android:text="在下邢道荣！"
    60.  
    61.             android:textSize="20sp"
    62.  
    63.             android:id="@+id/rb3"
    64.  
    65.             />
    66.  
    67.     </RadioGroup>
    68.  
    69.     <Button
    70.  
    71.         android:layout_width="wrap_content"
    72.  
    73.         android:layout_height="wrap_content"
    74.  
    75.         android:id="@+id/bt1"
    76.  
    77.         android:layout_gravity="center"
    78.  
    79.         android:text="我觉醒了"
    80.  
    81.         />
    82.  
    83.  
    84.  
    85. </LinearLayout>

    3:java

    MainAcitivity.java

    1. ​
    2. package com.jyt.woc2;
    3.  
    4. import androidx.appcompat.app.AppCompatActivity;
    5.  
    6. import android.content.Intent;
    7.  
    8. import android.os.Bundle;
    9.  
    10. import android.view.View;
    11.  
    12. import android.widget.Button;
    13.  
    14. import android.widget.EditText;
    15.  
    16. import android.widget.ImageView;
    17.  
    18. import android.widget.TextView;
    19.  
    20. import org.w3c.dom.Text;
    21.  
    22. public class MainActivity extends AppCompatActivity {
    23.  
    24.     private TextView ed;
    25.  
    26.     private Button bt;
    27.  
    28.     @Override
    29.  
    30.     protected void onCreate(Bundle savedInstanceState) {
    31.  
    32.         super.onCreate(savedInstanceState);
    33.  
    34.         setContentView(R.layout.activity_main);
    35.  
    36.         ed=findViewById(R.id.et);
    37.  
    38.         bt=findViewById(R.id.bt);
    39.  
    40.         bt.setOnClickListener(new View.OnClickListener() {
    41.  
    42.             @Override
    43.  
    44.             public void onClick(View view) {
    45.  
    46.                 Intent woc=new Intent(MainActivity.this,xz.class);//跳转
    47.  
    48.                 startActivityForResult(woc, 1);/* 请求有回调的跳转 */
    49.  
    50.             }
    51.  
    52.         });
    53.  
    54.     }
    55.  
    56.     @Override//对回调的数据做对应的处理很关键！！
    57.  
    58.     protected void onActivityResult(int requestCode, int resultCode, Intent data)
    59.  
    60.     {
    61.  
    62.         super.onActivityResult(requestCode, resultCode, data);
    63.  
    64.         if(requestCode==1 && resultCode==2){  //判断是否为待处理的结果   请求码和回调码一致才行
    65.  
    66.             Bundle bundle=data.getExtras();          //获取传递的数据包
    67.  
    68.             String woc =bundle.getString("woc");
    69.  
    70.             ed.setText(woc);
    71.  
    72.         }
    73.  
    74.     }
    75.  
    76. }
    77.  
    78.  
    79.  
    80. ​

    xz.java

    1. package com.jyt.woc2;
    2.  
    3.  
    4.  
    5. import android.content.Intent;
    6.  
    7. import android.os.Bundle;
    8.  
    9. import android.view.View;
    10.  
    11. import android.widget.Button;
    12.  
    13. import android.widget.RadioButton;
    14.  
    15. import android.widget.RadioGroup;
    16.  
    17.  
    18.  
    19. import androidx.appcompat.app.AppCompatActivity;
    20.  
    21.  
    22.  
    23. public class xz extends AppCompatActivity {
    24.  
    25.  
    26.  
    27.     private RadioButton rb1,rb2,rb3;
    28.  
    29.     private Button bt;
    30.  
    31.     @Override
    32.  
    33.     protected void onCreate(Bundle savedInstanceState) {
    34.  
    35.         super.onCreate(savedInstanceState);
    36.  
    37.         setContentView(R.layout.xz);
    38.  
    39.  
    40.  
    41.         rb1=findViewById(R.id.rb1);
    42.  
    43.         rb2=findViewById(R.id.rb2);
    44.  
    45.         rb3=findViewById(R.id.rb3);
    46.  
    47.  
    48.  
    49.         bt=findViewById(R.id.bt1);
    50.  
    51.  
    52.  
    53.         bt.setOnClickListener(new View.OnClickListener() {
    54.  
    55.             @Override
    56.  
    57.             public void onClick(View view) {
    58.  
    59.                 String x;
    60.  
    61.                 if(rb1.isChecked())
    62.  
    63.                 {
    64.  
    65.                     x=rb1.getText().toString();
    66.  
    67.                 }
    68.  
    69.                 else if(rb2.isChecked())
    70.  
    71.                 {
    72.  
    73.                     x=rb2.getText().toString();
    74.  
    75.                 }
    76.  
    77.                 else
    78.  
    79.                 {
    80.  
    81.                     x=rb3.getText().toString();
    82.  
    83.                 }
    84.  
    85.                 Intent intent=new Intent();//创建并实例化一个intent对象
    86.  
    87.                 Bundle bundle = new Bundle();    //实例化要传递的数据包
    88.  
    89.                 bundle.putString("woc",x);// 放入数据
    90.  
    91.                 intent.putExtras(bundle);    //将数据包保存到intent中
    92.  
    93.                 setResult(2, intent);    //设置返回的结果码，并返回调用该Activity的Activity
    94.  
    95.                 finish();        //关闭当前Activity
    96.  
    97.             }
    98.  
    99.         });
    100.  
    101.     }
    102.  
    103. }

    ​编辑

     ​编辑

    ​编辑

    三：Fragment 向Activity 传递数据

    ​编辑

    1:  activity_main.xml

    1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    2.  
    3.     xmlns:tools="http://schemas.android.com/tools"
    4.  
    5.     android:layout_width="match_parent"
    6.  
    7.     android:layout_height="match_parent"
    8.  
    9.     android:orientation="vertical"
    10.  
    11.     android:paddingBottom="@dimen/activity_vertical_margin"
    12.  
    13.     android:paddingLeft="@dimen/activity_horizontal_margin"
    14.  
    15.     android:paddingRight="@dimen/activity_horizontal_margin"
    16.  
    17.     android:paddingTop="@dimen/activity_vertical_margin"
    18.  
    19.     tools:context=".MainActivity" >
    20.  
    21.   <FrameLayout
    22.  
    23.         android:id="@+id/fragment_container1"
    24.  
    25.         android:layout_width="match_parent"
    26.  
    27.         android:layout_height="500dp"/>
    28.  
    29. </LinearLayout>

    2:   MainActivity.java

    1. package com.example.a5_4_1;
    2.  
    3.  
    4.  
    5.  
    6.  
    7. import android.app.Activity;
    8.  
    9. import android.app.Fragment;
    10.  
    11. import android.app.FragmentManager;
    12.  
    13. import android.app.FragmentTransaction;
    14.  
    15. import android.os.Bundle;
    16.  
    17. public class MainActivity extends Activity {
    18.  
    19.         FragmentManager fm;
    20.  
    21.         FragmentTransaction ft,ft1;
    22.  
    23.         Fragment f1=null;
    24.  
    25.         protected void onCreate(Bundle savedInstanceState) {
    26.  
    27.                super.onCreate(savedInstanceState);
    28.  
    29.                setContentView(R.layout.activity_main);
    30.  
    31.  
    32.  
    33.                fm = getFragmentManager();   // 获取Fragment
    34.  
    35.                ft = fm.beginTransaction(); // 开启一个事务
    36.  
    37.                f1 = new MainFragment1();
    38.  
    39.                ft.add(R.id.fragment_container1, f1);
    40.  
    41.                ft.commit();
    42.  
    43.  
    44.  
    45.             }
    46.  
    47.     
    48.  
    49.  }

    xml中放一个FrameLayout,加载fragment界面

    3:mainfragment1.xml

    1. <?xml version="1.0" encoding="utf-8"?>
    2.  
    3. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    4.  
    5.     android:orientation="vertical"
    6.  
    7.     android:layout_width="match_parent"
    8.  
    9.     android:layout_height="match_parent"
    10.  
    11.     >
    12.  
    13.     <LinearLayout
    14.  
    15.       android:orientation="horizontal"
    16.  
    17.       android:layout_width="wrap_content"
    18.  
    19.       android:layout_height="wrap_content" >
    20.  
    21.          <TextView
    22.  
    23.         android:id="@+id/txt1"
    24.  
    25.         android:text="请输入您的姓名"
    26.  
    27.         android:textSize="30dp"
    28.  
    29.         android:layout_width="wrap_content"
    30.  
    31.         android:layout_height="wrap_content"
    32.  
    33.         android:background="#FF0000"
    34.  
    35.         />
    36.  
    37.        <EditText
    38.  
    39.         android:id="@+id/edt1"
    40.  
    41.         android:text=""
    42.  
    43.         android:textSize="30dp"
    44.  
    45.         android:layout_width="180dp"
    46.  
    47.         android:layout_height="wrap_content"
    48.  
    49.         />
    50.  
    51.     </LinearLayout>
    52.  
    53.   
    54.  
    55.     <Button
    56.  
    57.         android:id="@+id/button"
    58.  
    59.         android:text="点击"
    60.  
    61.         android:gravity="center"
    62.  
    63.         android:layout_marginTop="50sp"
    64.  
    65.         android:layout_marginLeft="120sp"
    66.  
    67.         android:textSize="30dp"
    68.  
    69.         android:layout_width="wrap_content"
    70.  
    71.         android:layout_height="wrap_content"
    72.  
    73.         android:background="#00FF00"/>
    74.  
    75. </LinearLayout>

    4:mainfragment.java

    1. package com.example.a5_4_1;
    2.  
    3.  
    4.  
    5. import android.app.Fragment;
    6.  
    7. import android.content.Intent;
    8.  
    9. import android.os.Bundle;
    10.  
    11. import android.view.LayoutInflater;
    12.  
    13. import android.view.View;
    14.  
    15. import android.view.ViewGroup;
    16.  
    17. import android.widget.Button;
    18.  
    19. import android.widget.EditText;
    20.  
    21. public class MainFragment1 extends Fragment {
    22.  
    23.     
    24.  
    25.             @Override
    26.  
    27.             public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    28.  
    29.                 View contentView = inflater.inflate(R.layout.mainfragment1, container, false);
    30.  
    31.  
    32.  
    33.                 return contentView;
    34.  
    35.             }
    36.  
    37.             public void onActivityCreated(Bundle savedInstanceState) { 
    38.  
    39.                 super.onActivityCreated(savedInstanceState); 
    40.  
    41.                 final EditText edt=(EditText)getActivity().findViewById(R.id.edt1);
    42.  
    43.                 Button button = (Button) getActivity().findViewById(R.id.button); 
    44.  
    45.                 button.setOnClickListener(new View.OnClickListener() { 
    46.  
    47.             @Override 
    48.  
    49.             public void onClick(View v) { 
    50.  
    51.                
    52.  
    53.                 Intent intent = new Intent();
    54.  
    55.                 intent = new Intent(getActivity(), SecondActivity.class);
    56.  
    57.                        intent.putExtra("data", edt.getText().toString());
    58.  
    59.                        startActivity(intent);
    60.  
    61.                         //Toast.makeText(getActivity(), "Clicked", Toast.LENGTH_LONG).show(); 
    62.  
    63.                     } 
    64.  
    65.                 }); 
    66.  
    67.            
    68.  
    69.         }      
    70.  
    71.         }

    5:

    SecondActivity.java

    1. ​
    2. package com.example.a5_4_1;
    3.  
    4. import android.app.Activity;
    5.  
    6. import android.content.Intent;
    7.  
    8. import android.os.Bundle;
    9.  
    10. import android.widget.TextView;
    11.  
    12. public class SecondActivity extends Activity {
    13.  
    14.         @Override
    15.  
    16.         protected void onCreate(Bundle savedInstanceState) {
    17.  
    18.                super.onCreate(savedInstanceState);
    19.  
    20.                setContentView(R.layout.activity_second);
    21.  
    22.                TextView text=(TextView)findViewById(R.id.txt1);
    23.  
    24.    
    25.  
    26.                Intent intent = getIntent();
    27.  
    28.                String data1 = intent.getStringExtra("data");
    29.  
    30.                text.setText("你的姓名是"+data1);
    31.  
    32.         }
    33.  
    34. }
    35.  
    36.  
    37.  
    38. ​

    6:activity_second.xml

    1. ​
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.  
    4.     xmlns:tools="http://schemas.android.com/tools"
    5.  
    6.     android:layout_width="match_parent"
    7.  
    8.     android:layout_height="match_parent"
    9.  
    10.     android:paddingBottom="@dimen/activity_vertical_margin"
    11.  
    12.     android:paddingLeft="@dimen/activity_horizontal_margin"
    13.  
    14.     android:paddingRight="@dimen/activity_horizontal_margin"
    15.  
    16.     android:paddingTop="@dimen/activity_vertical_margin"
    17.  
    18.     tools:context=".SecondActivity" >
    19.  
    20.     <TextView
    21.  
    22.         android:id="@+id/txt1"
    23.  
    24.         android:layout_width="wrap_content"
    25.  
    26.         android:layout_height="wrap_content"
    27.  
    28.         android:text="" />
    29.  
    30.   
    31.  
    32. </LinearLayout>
    33.  
    34.  
    35.  
    36. ​

    这里不难发现，基本原理就和Activity之间的直传差不多，只是在Main下只加载界面而工作全部在加载的界面下完成

    ​

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  • 原文地址：https://blog.csdn.net/weixin_55439495/article/details/128125801