HelloWorldActivity.java
package syit.david; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class HelloWorldActivity extends Activity { private Button btn; public final static int REQUEST_CODE = 1; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn = (Button) findViewById(R.id.btn1); btn.setOnClickListener(listener); } private OnClickListener listener = new OnClickListener() { public void onClick(View v) { Intent intent = new Intent(); intent.setClass(HelloWorldActivity.this, SecondActivity.class); intent.putExtra("str", "First Android Application!"); //startActivity(intent); startActivityForResult(intent, REQUEST_CODE); } }; @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if(requestCode==REQUEST_CODE) { if(resultCode==SecondActivity.RESULT_CODE) { Bundle bundle = data.getExtras(); String str = bundle.getString("back"); Toast.makeText(HelloWorldActivity.this, str, Toast.LENGTH_LONG).show(); } } } }
SecondActivity.java
package syit.david; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class SecondActivity extends Activity { private TextView tv; private Button btn; public final static int RESULT_CODE = 1; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.second); tv = (TextView)findViewById(R.id.secondText); Intent intent = getIntent(); Bundle bundle = intent.getExtras(); String s = bundle.getString("str"); tv.setText(s); btn = (Button)findViewById(R.id.btn2); btn.setOnClickListener(listener); } public OnClickListener listener = new OnClickListener() { public void onClick(View v) { Intent intent = new Intent(); intent.putExtra("back", "Back Data"); setResult(RESULT_CODE, intent); finish(); } }; }
layout目录下的2个xml文件main和second
main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/firstText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/btn1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/btnText1" /> </LinearLayout>
second.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/secondText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/btn2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/btnText2" /> </LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="syit.david" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="15" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:name=".HelloWorldActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".SecondActivity" android:label="@string/app_name"> </activity> </application> <uses-permission android:name="android.permission.CALL_PHONE"/> <uses-permission android:name="android.permission.SEND_SMS"/> </manifest>
注意点:
1、新建一个Android的Activity后,都需要在AndroidManifest.xml文件中进行注册声明。
2、页面传递参数使用 startActivityForResult()方法,并实写其 onActivityResult()方法,在方法里进行判断处理。
3、接收页面使用setResult()方法,将值返回。