【Android进阶】判断网络连接状态并自动界面跳转

用于判断软件打开时的网络连接状态，若无网络连接，提醒用户跳转到设置界面

/**
	 * 设置在onStart()方法里面，可以在界面每次获得焦点的时候都进行检测
	 */
	
	@Override
	protected void onStart() {
		ConnectivityManager manager = (ConnectivityManager) this
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		NetworkInfo info = manager.getActiveNetworkInfo();
		if (info != null && info.isConnected()) {
			Toast.makeText(MainActivity.this, "网络连接连接", 0).show();
		} else {
			AlertDialog.Builder builder = new Builder(MainActivity.this);
			builder.setTitle("开启网络服务");
			builder.setMessage("网络没有连接，请到设置进行网络设置！");
			builder.setPositiveButton("确定",
					new DialogInterface.OnClickListener() {
						public void onClick(DialogInterface dialog, int which) {
							if (android.os.Build.VERSION.SDK_INT > 10) {
								// 3.0以上打开设置界面，也可以直接用ACTION_WIRELESS_SETTINGS打开到wifi界面
								startActivity(new Intent(
										android.provider.Settings.ACTION_SETTINGS));
							} else {
								startActivity(new Intent(
										android.provider.Settings.ACTION_WIRELESS_SETTINGS));
							}
							dialog.cancel();
						}
					});

			builder.setNegativeButton("取消",
					new DialogInterface.OnClickListener() {
						@Override
						public void onClick(DialogInterface dialog, int which) {
							dialog.cancel();
						}
					});
			builder.show();
		}
		super.onStart();
	}

需要注册的权限

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

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