分享一下我老师大神的人工智能教程！零基础，通俗易懂！http://blog.csdn.net/jiangjunshow
也欢迎大家转载本篇文章。分享知识，造福人民，实现我们中华民族伟大复兴！
一、Intent与Activity应用
0.创建新的Activity步骤
在应用中创建新的Acitivity很常见；
步骤1：创建一个class继承Activity
步骤2：在Android-manifest.xml中添加<activity>元素
比如创建了一个名为SubActivity的Activity，则需要声明如下：
<activity android:name=".SubActivity"></activity>
1.最简单的跳转到新的Activity
程序描述：MainActivity点击按钮后跳转到SubActivity，MainActivity传递一个（name,xiazdong）给SubActivity，并获得显示；
效果如下：
点击按钮后：
IntentActivity.java
package org.xiazdong;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;public class IntentActivity extends Activity { private Button btn1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn1 = (Button)this.findViewById(R.id.brn1); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(IntentActivity.this, SubActivity.class); //从IntentActivity跳转到SubActivity intent.putExtra("name", "xiazdong"); //放入数据 startActivity(intent); //开始跳转 } }); }}
SubActivity.java
package org.xiazdong;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class SubActivity extends Activity{ private TextView tv1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.sub); tv1 = (TextView)this.findViewById(R.id.tv1); Intent intent = this.getIntent(); //获得当前的Intent Bundle bundle = intent.getExtras(); //获得全部数据 String value = bundle.getString("name"); //获得名为name的值 tv1.setText(value); }}
2.带返回值的跳转
跳转到新的Activity并在结束后将返回值传给原Activity
程序描述：MainActivity跳转到SubActivity后，SubActivity执行完后返回一个结果码给IntentActivity，执行对应的过程；
程序效果：
点击跳转后执行完第二个Activity后再跳回第一个Activity
IntentActivity.java
package org.xiazdong;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 IntentActivity extends Activity { private Button btn1; private TextView tv1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btn1 = (Button)this.findViewById(R.id.brn1); tv1 = (TextView)this.findViewById(R.id.tv2); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(); intent.setClass(IntentActivity.this, SubActivity.class); startActivityForResult(intent, 100); //requestcode=100 } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode==100&&resultCode==200){ Bundle bundle = data.getExtras(); String response = bundle.getString("response"); tv1.setText(response); } } }SubActivity.java
package org.xiazdong;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class SubActivity extends Activity{ private TextView tv1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.sub); tv1 = (TextView)this.findViewById(R.id.tv1); Intent intent = new Intent(); //创建一个Intent intent.putExtra("response", "来自2"); setResult(200,intent); //返回码为200 finish(); }}
给我老师的人工智能教程打call！http://blog.csdn.net/jiangjunshow
