Go语言视频零基础入门到精通

njjwheu

    Android的Intent分为两大类，显性的(Explicit )的和隐性的(Implicit)。
　　显性的很简单就是我们常用的Activit跳转，他指明了从一个Activity跳转到另一个，代码如下
Intent i = new Intent(this,AnotherActivity.class);

startActivity(i);

  最多加一些需要传递的数据，或者回调时的参量这时需要用startActivityForResult()
       隐性的没有指明从哪跳转到哪，需要自定义Action。
       首先是第一个Activity，它定义了mapSearchIntent这个Action

java代码：


import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;



public class Main extends Activity {

private final String mapSearchIntent = "com.decarta.mapsearch.intent.action.SEARCH";



/** Called when the activity is first created. */



@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Uri mapUri = Uri.parse("geo:39.906033,116.397700");

Intent i = new Intent(mapSearchIntent, mapUri);

i.setData(mapUri);



startActivity(i);

}



}



import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;



public class Main extends Activity {

private final String mapSearchIntent = "com.decarta.mapsearch.intent.action.SEARCH";



/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Uri mapUri = Uri.parse("geo:39.906033,116.397700");

Intent i = new Intent(mapSearchIntent, mapUri);

i.setData(mapUri);

startActivity(i);

}

}



     然后是要跳转的Activity：

java代码：

import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;



/**

* @author Tony Shen

*

*/



public class SecondActivity extends Activity{

private Uri data;

private String action;



/** Called when the activity is first created. */



@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

Intent intent = getIntent();



if (intent.getAction() != null)

action = intent.getAction();



if (intent.getData()!=null)

data = intent.getData();



if (action.equals("com.decarta.mapsearch.intent.action.SEARCH")) {

Intent i = new Intent(Intent.ACTION_VIEW, data);

startActivity(i);

}

}

}
java代码：
import android.app.Activity;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;



/**

* @author Tony Shen

*

*/



public class SecondActivity extends Activity{

private Uri data;

private String action;



/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

Intent intent = getIntent();



if (intent.getAction() != null)

action = intent.getAction();



if (intent.getData()!=null)

data = intent.getData();



if (action.equals("com.decarta.mapsearch.intent.action.SEARCH")) {

Intent i = new Intent(Intent.ACTION_VIEW, data);

startActivity(i);

}

}

}