Android界面间的相互传值

雨点打透心脏的1/2处 2022-06-14 09:59 163阅读 0赞

简单介绍一下Android界面之间的传值，以下为效果展示图

1：

![Center][]

2：

![Center 1][]

3：

![Center 2][]

以下为代码示例

activity\_main.xml

<?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"
        android:orientation="vertical"
        xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
        android:layout_height="match_parent" tools:context="com.example.kongjian_10.MainActivity">
    
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="请输入用户名"
            android:id="@+id/et_main_text"
            />
    
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="写心情"
            android:onClick="writerHeart"
            />
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tv_main_showThank"
            />
    
    
    </LinearLayout>

activity\_item.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tv_item_showName"
            />
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:lines="5"
            android:hint="请输入心情"
            android:gravity="top"
            android:id="@+id/et_item_text"
            />
        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="ok"
            android:text="输入完毕"
            />
    
    </LinearLayout>

MainActivity.java

package com.example.kongjian_10;
    
    import android.content.Intent;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.TextView;
    
    public class MainActivity extends AppCompatActivity {
    
        private EditText et;
        private TextView tv;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            et = (EditText) findViewById(R.id.et_main_text);
            tv = (TextView) findViewById(R.id.tv_main_showThank);
            String content=getIntent().getStringExtra("content");
            tv.setText(content);
        }
        public void writerHeart(View view){
            String uname=et.getText().toString();
            Intent intent=new Intent(this,ItemActivity.class);
            intent.putExtra("uname",uname);
            startActivity(intent);
        }
    }

ItemActivity.java

package com.example.kongjian_10;
    
    import android.content.Intent;
    import android.os.Bundle;
    import android.support.annotation.Nullable;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.TextView;
    
    /**
     * Created by Administrator on 2017/6/16.
     */
    
    public class ItemActivity extends AppCompatActivity {
    
        private TextView tv;
        private EditText et;
    
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_item);
            tv = (TextView) findViewById(R.id.tv_item_showName);
            et = (EditText) findViewById(R.id.et_item_text);
            //获取第一个界面传过来的数据
            String uname=getIntent().getStringExtra("uname");
            tv.setText(uname);
        }
        public void ok(View view){
            String content=et.getText().toString();
            Intent intent=new Intent(this,MainActivity.class);
            intent.putExtra("content",content);
            startActivity(intent);
        }
    }

[Center]: /images/20220614/d8d6f970a16d42a2a2d5d4fa1308f508.png
[Center 1]: /images/20220614/6ba752c878d3431a9fb70b2959a38f0f.png
[Center 2]: /images/20220614/d883acabf2ee4be4aa66d2229340f087.png