android--Activity有返回值的跳轉

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.hanqi.test4"><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:supportsRtl="true"android:theme="@style/AppTheme"><activity android:name=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><activity android:name=".Main2Activity"></activity></application></manifest>

MainActivity

package com.hanqi.test4;import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;/*** Created by Administrator on 2016/3/21.*/
public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main_layout);}//普通方式public void ONCLICK(View v){Log.e("T4TAG","按鈕的點擊監聽被觸發");//靜態方法//直接用類名就可以調用，不需要實例化//構建了一個Toast實例//方法連Toast.makeText(this,"按鈕的點擊監聽被觸發",Toast.LENGTH_LONG).show();//        Toast toast= Toast.makeText(this,"按鈕的點擊監聽被觸發",Toast.LENGTH_LONG);
//        toast.show();//用intent//取得要傳遞的信息//獲取View實例EditText myet=(EditText)findViewById(R.id.myet);String string= myet.getText().toString();Intent intent= new Intent(this,Main2Activity.class);//存儲內容//getExtra Bundle 實際是一個HashMap  進行了限制//intent.getExtras().putString("myet",string);intent.putExtra("myet",string);startActivity(intent);}//帶返回的方式public void onCLICK(View v){EditText myet=(EditText)findViewById(R.id.myet);String string= myet.getText().toString();Intent intent= new Intent(this,Main2Activity.class);//存儲內容//getExtra Bundle 實際是一個HashMap  進行了限制//intent.getExtras().putString("myet",string);intent.putExtra("myet",string);//有返回數據的啟動方式//第一個參數  intent//第二個參數  requestCode  請求碼startActivityForResult(intent, 1);}//重寫   處理返回信息的監聽（回調方法）//onActivityResult通用監聽  監聽所有返回信息的//必須要有requestCode區分有哪個請求返回的
    @Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);Log.e("TAG","requestCode="+requestCode+"resultCode"+resultCode);if (requestCode ==1 ){if (resultCode == RESULT_OK){//獲取返回信息String string = data.getExtras().getString("mytv");EditText editText =(EditText)findViewById(R.id.myet);editText.setText(string);Toast.makeText(this, "返回信息=" + string, Toast.LENGTH_LONG);}else {Toast.makeText(this,"返回信息有問題",Toast.LENGTH_SHORT);}}}
}

main_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><EditTextandroid:layout_width="100dp"android:layout_height="wrap_content"android:id="@+id/myet"/><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="普通方式"android:onClick="ONCLICK"/><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="帶返回方式"android:onClick="onCLICK"/>
</LinearLayout>

Main2Activity

package com.hanqi.test4;import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;public class Main2Activity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main2);//接受信息//獲取意圖//傳遞過來的IntentIntent intent=getIntent();String s = intent.getExtras().getString("myet");EditText mytv=(EditText)findViewById(R.id.mytv);mytv.setText(s);}//普通返回public void onclick(View V){//關閉當前activity
        finish();}public void ONclock(View v){//存儲返回數據   也要用intentEditText mytv=(EditText)findViewById(R.id.mytv);Bundle bundle =new Bundle();bundle.putString("mytv",mytv.getText().toString());//設置返回數據// 先設置ReaultCode,再設置存儲數據的意圖setResult(RESULT_OK,new Intent().putExtra("mytv",mytv.getText().toString()));//關閉當前activity
        finish();}
}

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.hanqi.test4.Main2Activity"><EditTextandroid:layout_width="100dp"android:layout_height="wrap_content"android:text="測試"android:id="@+id/mytv"/><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="普通返回"android:onClick="onclick"/><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="帶數據返回"android:onClick="ONclock"/>
</LinearLayout>

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