启动一个Activity用于输入信息

1.在第一个Activity中启动另一个Activity
2.在第二个Activity中输入信息返回给第一个Activity
3.在第二个Activity中进行确定或取消操作需要在第一个Activity中进行判断和提示（取消状态）

MainActivity布局文件 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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.sky.mywish.MainActivity">


    <Button
        android:id="@+id/btnWriteWish"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/btnWriteWish" />

    <TextView
        android:id="@+id/tvResult"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="" />

</LinearLayout>

MainActivity java 代码

package com.example.sky.mywish;

import android.content.Intent;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private TextView tvResult;
    private Button btnWriteWish;

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


        tvResult = findViewById(R.id.tvResult);
        btnWriteWish = findViewById(R.id.btnWriteWish);


        btnWriteWish.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this,AnotherActivity.class);
                startActivityForResult(i,2);
            }
        });


    }


    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (resultCode){
            case 1:
                tvResult.setText("你的愿望是：" + data.getStringExtra("data"));
                break;
            case 0:
                Toast.makeText(MainActivity.this,R.string.cancel,Toast.LENGTH_SHORT).show();
                break;
        }



    }
}

AnotherActivity 布局文件

<?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"
    tools:context="com.example.sky.mywish.AnotherActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/tvWriteWish"
        android:textSize="20dp"/>

    <EditText
        android:id="@+id/etWriteWish"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btnSubmit"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/btnSubmit" />

        <Button
            android:id="@+id/btnCancel"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/btnCancel" />


    </LinearLayout>


</LinearLayout>

AnotherActivity java代码

package com.example.sky.mywish;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class AnotherActivity extends AppCompatActivity {
    private Button btnSubmit,btnCancel;
    private EditText etWriteWish;



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

        btnSubmit = findViewById(R.id.btnSubmit);
        btnCancel = findViewById(R.id.btnCancel);
        etWriteWish = findViewById(R.id.etWriteWish);
        btnSubmit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent();
                i.putExtra("data",etWriteWish.getText().toString());
                setResult(1,i);
                finish();

            }
        });

        btnCancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setResult(0,getIntent());
                finish();
            }
        });


    }
}

string.xml

<resources>
    <string name="app_name">MyWish</string>
    <string name="btnWriteWish">写下你的愿望</string>
    <string name="btnSubmit">提交</string>
    <string name="btnCancel">取消</string>
    <string name="tvWriteWish">写下你今天的愿望：</string>
    <string name="cancel">你取消了写愿望</string>
    <string name="wish">你的愿望是：</string>
</resources>