页面传值

跳页面传值：

单条数据传值（MainActivity页面的代码）：

Intent intent = new Intent(MainActivity.this,GetDataActivity.class); 
intent.putExtra("name","张三");
startActivity(intent);

GetDataActivity页面的代码：

Intent intent = getIntent();
String name = intent.getStringExtra("name"); //name就是上一页传过来的值

多条数据传值（MainActivity页面的代码）：

ArrayList<String> data = new ArrayList<>();
        data.add("张三");
        data.add("李四");
        data.add("王五");
intent.putStringArrayListExtra("nameList",data);
startActivity(intent);

GetDataActivity页面的代码：

Intent intent = getIntent();
ArrayList nameList = intent.getCharSequenceArrayListExtra("nameList");
String name1 = nameList.get(0);
String name2 = nameList.get(1);
String name3 = nameList.get(2);

跳页面取值：

单条数据取值（MainActivity代码）：

Intent intent = new Intent(this,GetDataActivity.class);
startActivityForResult(intent,0x11);

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == 0x11){
        if(resultCode == 1){
            String lessData = data.getStringExtra("lessData");
        }
    }  
}

GetDataActivity页面的代码：

Intent intent = getIntent();
String title = "头部“;
intent.putExtra("lessData",title);
setResult(1,intent);
finish();

多条数据传值（MainActivity页面的代码）：

Intent intent = new Intent(this,GetDataActivity.class);
startActivityForResult(intent,0x12);

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 0x12){
             if(resultCode == 2){
                   ArrayList mData = data.getCharSequenceArrayListExtra("manyData");      
             }
        }
}

GetDataActivity页面的代码：

ArrayList<String> manyData = new ArrayList<>();
manyData.add("张一");
manyData.add("张二");
manyData.add("张三");
manyData.add("张四");

intent.putStringArrayListExtra("manyData",manyData);
setResult(2,intent);
finish();

完整代码（MainActivity页面代码）：

package com.example.testproject;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private Button btn_less,btn_many;
    private TextView tv_title,tv_name,tv_sex,tv_age;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView(){
        btn_less = (Button)findViewById(R.id.btn_Less);
        btn_many = (Button)findViewById(R.id.btn_Many);
        tv_title = (TextView)findViewById(R.id.text_title);
        tv_name = (TextView)findViewById(R.id.text_name);
        tv_sex = (TextView)findViewById(R.id.text_sex);
        tv_age = (TextView)findViewById(R.id.text_age);

        btn_less.setOnClickListener(this);
        btn_many.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        ArrayList<String> data = new ArrayList<>();
        data.add("张三");
        data.add("李四");
        data.add("王五");

        Intent intent = new Intent(this,GetDataActivity.class);
        switch (view.getId()){
            case R.id.btn_Less:
                intent.putExtra("data","Less");
//                intent.putStringArrayListExtra("nameList",data);
                startActivityForResult(intent,0x11);
                break;
            case R.id.btn_Many:
                intent.putExtra("data","Mang");
                startActivityForResult(intent,0x12);
                break;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        cleanText();
        switch (requestCode){
            case 0x11:
                String lessData = data.getStringExtra("lessData");

                switch (resultCode){
                    case 1:
                        tv_title.setText(lessData);
                        Toast.makeText(this, "1", Toast.LENGTH_SHORT).show();
                        break;
                    case 2:
                        tv_name.setText(lessData);
                        Toast.makeText(this, "2", Toast.LENGTH_SHORT).show();
                        break;
                    case 3:
                        tv_age.setText(lessData);
                        break;
                    case 4:
                        tv_sex.setText(lessData);
                        break;
                        default:break;
                }
                break;

            case 0x12:
                if(resultCode == 123){
                    ArrayList mData = data.getCharSequenceArrayListExtra("manyData");
                    tv_title.setText(mData.get(0).toString());
                    tv_name.setText(mData.get(1).toString());
                    tv_age.setText(mData.get(2).toString());
                    tv_sex.setText(mData.get(3).toString());
                }
                break;
        }
    }

    private void cleanText(){
        tv_title.setText("");
        tv_name.setText("");
        tv_age.setText("");
        tv_sex.setText("");
    }
}

MainActivity的布局代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:paddingTop="10dp"
    android:paddingBottom="10dp"
    android:paddingRight="10dp"
    android:paddingLeft="10dp"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <LinearLayout
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="40dp">
       <TextView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="标题："/>
        <TextView
            android:id="@+id/text_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="标题"/>
    </LinearLayout>
    <LinearLayout
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="40dp">
        <TextView
            android:text="姓名："
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/text_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="姓名"/>
    </LinearLayout>
    <LinearLayout
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="40dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="性别："/>
        <TextView
            android:id="@+id/text_sex"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:hint="性别"/>
    </LinearLayout>
    <LinearLayout
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="40dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="年龄："/>
        <TextView
            android:id="@+id/text_age"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:hint="年龄"/>
    </LinearLayout>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="40dp">
        <Button
            android:id="@+id/btn_Many"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="多条数据"/>
        <Button
            android:id="@+id/btn_Less"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="单条数据"/>
    </LinearLayout>

</LinearLayout>

GetDataActivity页面的代码：

package com.example.testproject;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.util.ArrayList;

public class GetDataActivity extends AppCompatActivity implements View.OnClickListener{
    private EditText edt_title,edt_name,edt_sex,edt_age;
    private Button btn_M,btn_L;

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

   private void initView(){
       edt_title = (EditText)findViewById(R.id.edt_title);
       edt_name = (EditText)findViewById(R.id.edt_name);
       edt_sex = (EditText)findViewById(R.id.edt_sex);
       edt_age = (EditText)findViewById(R.id.edt_age);

       btn_L = (Button)findViewById(R.id.btn_Less_data);
       btn_M = (Button)findViewById(R.id.btn_Many_data);

       btn_L.setOnClickListener(this);
       btn_M.setOnClickListener(this);

       Intent intent = getIntent();
       String data = intent.getStringExtra("data");
       switch (data){
           case "Less":
               btn_M.setEnabled(false);
               break;
           case "Mang":
               btn_L.setEnabled(false);
               break;
       }

//       ArrayList nameList = intent.getCharSequenceArrayListExtra("nameList");
//       Toast.makeText(this, "" + nameList, Toast.LENGTH_SHORT).show();
   }



    @Override
    public void onClick(View view) {
        Intent intent = new Intent();
        switch (view.getId()){
            case R.id.btn_Less_data:
                inputCheck(1);
                break;

            case R.id.btn_Many_data:
                inputCheck(2);
                break;
        }
    }

    //输入框校验
    private void inputCheck(int position){
        String title = edt_title.getText().toString();
        String name = edt_name.getText().toString();
        String age = edt_age.getText().toString();
        String sex = edt_sex.getText().toString();

        if(title.isEmpty() && name.isEmpty() && age.isEmpty() && sex.isEmpty() ){
            Toast.makeText(this, "传值不能为空", Toast.LENGTH_SHORT).show();
            return;
        }

        Intent intent = getIntent();

        switch (position){
            case 1:
                if(!title.isEmpty()){
                    intent.putExtra("lessData",title);
                    setResult(1,intent);
                    finish();
                }
                if(!name.isEmpty()){
                    intent.putExtra("lessData",name);
                    setResult(2,intent);
                    finish();
                }
                if(!age.isEmpty()){
                    intent.putExtra("lessData",age);
                    setResult(3,intent);
                    finish();
                }
                if(!sex.isEmpty()){
                    intent.putExtra("lessData",sex);
                    setResult(4,intent);
                    finish();
                }
                break;

            case 2:
                if(title.isEmpty() || name.isEmpty() || age.isEmpty() || sex.isEmpty() ){
                    Toast.makeText(this, "传值不能为空", Toast.LENGTH_SHORT).show();
                }else{
                    ArrayList<String> manyData = new ArrayList<>();
                    manyData.add(title);
                    manyData.add(name);
                    manyData.add(age);
                    manyData.add(sex);

                    intent.putStringArrayListExtra("manyData",manyData);
                    setResult(123,intent);
                    finish();
                }
                break;
        }
    }
}

GetDataActivity的布局代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    android:paddingTop="10dp"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    tools:context=".GetDataActivity">
    <EditText
        android:id="@+id/edt_title"
        android:lines="1"
        android:maxLength="5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="标题"/>
    <EditText
        android:id="@+id/edt_name"
        android:lines="1"
        android:maxLength="9"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="姓名"/>
    <EditText
        android:id="@+id/edt_age"
        android:lines="1"
        android:maxLength="2"
        android:inputType="number"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="年龄"/>
    <EditText
        android:id="@+id/edt_sex"
        android:lines="1"
        android:maxLength="2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="性别"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp">
        <Button
            android:id="@+id/btn_Less_data"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="单条数据"/>
        <Button
            android:id="@+id/btn_Many_data"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="多条数据"/>
    </LinearLayout>
</LinearLayout>

测试项目（点击获取，提取码：g555）

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原文地址：https://www.cnblogs.com/Mr-Deng/p/11388452.html