隐式Intent

隐式Intent在Activity中调用Activity

    //web浏览器
    Uri uri= Uri.parse("http://www.baidu.com:8080/image/a.jpg");
    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
    startActivity(intent);
    
    //地图(要在 Android 手机上才能测试)
    Uri uri = Uri.parse("geo:38.899533,-77.036476");
    Intent intent = new Intent(Intent.ACTION_VIEW, uri);
    startActivity(intent);
    
    //路径规划
    Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");
    Intent it = new Intent(Intent.ACTION_VIEW, uri);
    startActivity(it);
    
    //拨打电话-调用拨号程序，这个用户体验要比下面的那个要好一些
    Uri uri = Uri.parse("tel:15980665805");
    Intent intent = new Intent(Intent.ACTION_DIAL, uri);
    startActivity(intent);
    
    //拨打电话-直接拨打电话
    //要使用这个必须在配置文件中加入<uses-permission android:name="android.permission.CALL_PHONE"/>
    Uri uri = Uri.parse("tel:15980665805");
    Intent intent = new Intent(Intent.ACTION_CALL, uri);
    startActivity(intent);
 
    //调用发送短信程序(方法一)
    Uri uri = Uri.parse("smsto:15980665805");
    Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
    intent.putExtra("sms_body", "The SMS text");
    startActivity(intent);
    
    //调用发送短信程序(方法二)
    Intent intent = new Intent(Intent.ACTION_VIEW);     
    intent.putExtra("sms_body", "The SMS text");     
    intent.setType("vnd.android-dir/mms-sms");     
    startActivity(intent);
    
    //发送彩信
    Uri uri = Uri.parse("content://media/external/images/media/23");
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.putExtra("sms_body", "some text");
    intent.putExtra(Intent.EXTRA_STREAM, uri);
    intent.setType("image/png");
    startActivity(intent);
    
    //发送Email(方法一)(要在 Android 手机上才能测试)
    Uri uri = Uri.parse("mailto:[email protected]");
    Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
    startActivity(intent);
    
    //发送Email(方法二)(要在 Android 手机上才能测试)
    Intent intent = new Intent(Intent.ACTION_SENDTO);  
    intent.setData(Uri.parse("mailto:[email protected]"));  
    intent.putExtra(Intent.EXTRA_SUBJECT, "这是标题");  
    intent.putExtra(Intent.EXTRA_TEXT, "这是内容");  
    startActivity(intent); 
    
    //发送Email(方法三)(要在 Android 手机上才能测试)
    Intent intent = new Intent(Intent.ACTION_SEND);
    intent.putExtra(Intent.EXTRA_EMAIL, "[email protected]");
    intent.putExtra(Intent.EXTRA_SUBJECT, "这是标题");  
    intent.putExtra(Intent.EXTRA_TEXT, "这是内容");
    intent.setType("text/plain");
    //选择一个邮件客户端
    startActivity(Intent.createChooser(intent, "Choose Email Client"));  
    
    //发送Email(方法四)(要在 Android 手机上才能测试)
    Intent intent = new Intent(Intent.ACTION_SEND);
    //收件人
    String[] tos = {"[email protected]", "[email protected]"};
    //抄送人
    String[] ccs = {"[email protected]", "[email protected]"};
    //密送人
    String[] bcc = {"[email protected]", "[email protected]"};
    intent.putExtra(Intent.EXTRA_EMAIL, tos);    
    intent.putExtra(Intent.EXTRA_CC, ccs);
    intent.putExtra(Intent.EXTRA_BCC, bcc);
    intent.putExtra(Intent.EXTRA_SUBJECT, "这是标题"); 
    intent.putExtra(Intent.EXTRA_TEXT, "这是内容");    
    intent.setType("message/rfc822");    
    startActivity(Intent.createChooser(intent, "Choose Email Client"));
    
    //发送Email且发送附件(要在 Android 手机上才能测试)
    Intent intent = new Intent(Intent.ACTION_SEND);    
    intent.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");    
    intent.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mp3/醉红颜.mp3");    
    intent.setType("audio/mp3");    
    startActivity(Intent.createChooser(intent, "Choose Email Client"));
    
    //播放媒体文件(android 对中文名的文件支持不好)
    Intent intent = new Intent(Intent.ACTION_VIEW);
    //Uri uri = Uri.parse("file:///sdcard/zhy.mp3");
    Uri uri = Uri.parse("file:///sdcard/a.mp3"); 
    intent.setDataAndType(uri, "audio/mp3"); 
    startActivity(intent);
    
    Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");     
    Intent intent = new Intent(Intent.ACTION_VIEW, uri);     
    startActivity(intent); 
    
    //音乐选择器
    //它使用了Intent.ACTION_GET_CONTENT 和 MIME 类型来查找支持 audio/* 的所有 Data Picker，允许用户选择其中之一
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
    intent.setType("audio/*");
    //Intent.createChooser：应用选择器，这个方法创建一个 ACTION_CHOOSER Intent
    startActivity(Intent.createChooser(intent, "选择音乐"));
    
    Intent intent1 = new Intent(Intent.ACTION_GET_CONTENT); 
    intent1.setType("audio/*");
    
    Intent intent2 = new Intent(Intent.ACTION_CHOOSER);
    intent2.putExtra(Intent.EXTRA_INTENT, intent1);
    intent2.putExtra(Intent.EXTRA_TITLE, "aaaa");
    startActivity(intent2);
    
    
//                //设置壁纸
//                Intent intent = new Intent(Intent.ACTION_SET_WALLPAPER);  
//                startActivity(Intent.createChooser(intent, "设置壁纸"));  
    
    //卸载APK
    //fromParts方法
    //参数1：URI 的 scheme
    //参数2：包路径
    //参数3：
    Uri uri = Uri.fromParts("package", "com.great.activity_intent", null);    
    Intent intent = new Intent(Intent.ACTION_DELETE, uri);     
    startActivity(intent);
    
    //安装APK(???)
    Uri uri = Uri.fromParts("package", "com.great.activity_intent", null);  
    Intent intent = new Intent(Intent.ACTION_PACKAGE_ADDED, uri);
    startActivity(intent);
    
    //调用搜索
    Intent intent = new Intent();  
    intent.setAction(Intent.ACTION_WEB_SEARCH);  
    intent.putExtra(SearchManager.QUERY, "android");  
    startActivity(intent);

如果你不知道那个APP的Activity，但是知道包名(package name)，那么可以使用如下的方法：

Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.package.address");  
startActivity(LaunchIntent);  

如果APP之间有合作关系，可以获得合作APP的清单文件(manifest)，那么可以从该文件中获知package/activity, 
可使用如下的方法来启动该APP特定活动界面：

Intent intent = new Intent(Intent.ACTION_MAIN);  
intent.setComponent(new ComponentName("com.package.address","com.package.address.MainActivity"));  
startActivity(intent);  

如果要在启动APP时传递参数，可以在意图(Intent)中设置:

intent.putExtra("firstKeyName","FirstKeyValue");  
intent.putExtra("secondKeyName","SecondKeyValue");