惯用activity跳转

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//打电话
Intent callIntent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:12345678"));
startActivity(callIntent);
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//直接启动拨号程序
Intent touchDialerIntent = new Intent("com.android.phone.action.TOUCH_DIALER");
startActivity(touchDialerIntent);
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//把电话号码传到拨号程序
Intent dialIntent = new Intent(Intent.ACTION_DIAL,Uri.parse("tel:87654321"));
startActivity(dialIntent);
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//浏览网页
Intent webIntent = new Intent(Intent.ACTION_VIEW,Uri.parse("http://nokiaguy.blogjava.net"));
startActivity(webIntent);
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//向email客户端传递email地址
Uri uri = Uri.parse("mailto:xxx@abc.com");
Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
startActivity(intent);
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//发送email
Intent sendEmailIntent = new Intent(Intent.ACTION_SEND);
//指定要发送的目标email
sendEmailIntent.putExtra(Intent.EXTRA_EMAIL,new String[] { "techcast@126.com" });
//指定要抄送的email
sendEmailIntent.putExtra(Intent.EXTRA_CC, new String[] {"abc@126.com", "test@126.com" });
//指定email标题
sendEmailIntent.putExtra(Intent.EXTRA_SUBJECT, "关于Android的两个技术问题");
//指定email内容
sendEmailIntent.putExtra(Intent.EXTRA_TEXT,"1. 如何调用其他应用程序中的Activity?\n2. 在应用程序中如果接收系统广播？");

sendEmailIntent.setType("text/plain");
//选择发送消息的客户端
startActivity(Intent.createChooser(sendEmailIntent, "选择发送消息的客户端"));
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//查看联系人
Intent contactListIntent = new Intent("com.android.contacts.action.LIST_CONTACTS");
startActivity(contactListIntent);
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//显示系统设置界面
Intent settingsIntent = new Intent("android.settings.SETTINGS");
startActivity(settingsIntent);
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//wifi设置界面
Intent wifiSettingsIntent = new Intent("android.settings.WIFI_SETTINGS");
startActivity(wifiSettingsIntent);
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//启动处理音频程序
Intent audioIntent = new Intent(Intent.ACTION_GET_CONTENT);
audioIntent.setType("audio/*");
startActivity(Intent.createChooser(audioIntent, "选择音频程序"));
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