安卓的Activity 之间的传值

安卓的Activity
之间的传值

activivity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="hello.unc.com.government.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!"        android:id="@+id/tvOut" />    <Button        android:text="Start Aty1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/textView2"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginLeft="41dp"        android:layout_marginStart="41dp"        android:layout_marginTop="54dp"        android:id="@+id/btnStartAty1" /></RelativeLayout>

---

aty1.xm

<?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">    <TextView        android:text="Aty1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/tvOut"        android:layout_weight="1" />    <Button        android:text="Stop"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/btnStopAty1"        android:layout_weight="1" /></LinearLayout>

---

MianActivity.java

package hello.unc.com.government;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.TextView;public class MainActivity extends AppCompatActivity {    private TextView tvOut;    private Button btnStart;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btnStart =(Button) findViewById(R.id.btnStartAty1);        tvOut = (TextView) findViewById(R.id.tvOut);        btnStart.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent i = new Intent(MainActivity.this,Aty1.class);                Bundle data =  new Bundle();                data.putString("txt","Hello Aty1");                i.putExtras(data);                startActivityForResult(i,0);            }        });    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        String result = data.getStringExtra("result");        tvOut.setText(result);        super.onActivityResult(requestCode, resultCode, data);    }}

---

Aty1.java

package hello.unc.com.government;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;/** * Created by 星灿 on 2016/9/29. */public class Aty1 extends Activity {    private TextView tvOut;    private Button btnStop;    @Override    protected void onCreate(Bundle savedInstanceState) {        setContentView(R.layout.aty1);        btnStop = (Button)findViewById(R.id.btnStopAty1);        btnStop.setOnClickListener(new View.OnClickListener(){            public void onClick(View v){                Intent i = new Intent();                i.putExtra("result","Hello MainActivity");                setResult(0,i);                finish();            }        });        tvOut = (TextView) findViewById(R.id.tvOut);        Bundle data = getIntent().getExtras();        String txt = data.getString("txt");        tvOut.setText(txt);        super.onCreate(savedInstanceState);    }}

---

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="hello.unc.com.government">    <application        android: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=".Aty1"></activity>    </application></manifest>